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files >> //proc/self/root/home/topsuzmw/public_html/wp-includes/private/Core.zip
 PK������ZI��2���2����ChaCha20.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_ChaCha20', false)) {
    return;
}

/**
 * Class ParagonIE_Sodium_Core_ChaCha20
 */
class ParagonIE_Sodium_Core_ChaCha20 extends ParagonIE_Sodium_Core_Util
{
    /**
     * Bitwise left rotation
     *
     * @internal You should not use this directly from another application
     *
     * @param int $v
     * @param int $n
     * @return int
     */
    public static function rotate($v, $n)
    {
        $v &= 0xffffffff;
        $n &= 31;
        return (int) (
            0xffffffff & (
                ($v << $n)
                    |
                ($v >> (32 - $n))
            )
        );
    }

    /**
     * The ChaCha20 quarter round function. Works on four 32-bit integers.
     *
     * @internal You should not use this directly from another application
     *
     * @param int $a
     * @param int $b
     * @param int $c
     * @param int $d
     * @return array<int, int>
     */
    protected static function quarterRound($a, $b, $c, $d)
    {
        # a = PLUS(a,b); d = ROTATE(XOR(d,a),16);
        /** @var int $a */
        $a = ($a + $b) & 0xffffffff;
        $d = self::rotate($d ^ $a, 16);

        # c = PLUS(c,d); b = ROTATE(XOR(b,c),12);
        /** @var int $c */
        $c = ($c + $d) & 0xffffffff;
        $b = self::rotate($b ^ $c, 12);

        # a = PLUS(a,b); d = ROTATE(XOR(d,a), 8);
        /** @var int $a */
        $a = ($a + $b) & 0xffffffff;
        $d = self::rotate($d ^ $a, 8);

        # c = PLUS(c,d); b = ROTATE(XOR(b,c), 7);
        /** @var int $c */
        $c = ($c + $d) & 0xffffffff;
        $b = self::rotate($b ^ $c, 7);
        return array((int) $a, (int) $b, (int) $c, (int) $d);
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_ChaCha20_Ctx $ctx
     * @param string $message
     *
     * @return string
     * @throws TypeError
     * @throws SodiumException
     */
    public static function encryptBytes(
        ParagonIE_Sodium_Core_ChaCha20_Ctx $ctx,
        $message = ''
    ) {
        $bytes = self::strlen($message);

        /*
        j0 = ctx->input[0];
        j1 = ctx->input[1];
        j2 = ctx->input[2];
        j3 = ctx->input[3];
        j4 = ctx->input[4];
        j5 = ctx->input[5];
        j6 = ctx->input[6];
        j7 = ctx->input[7];
        j8 = ctx->input[8];
        j9 = ctx->input[9];
        j10 = ctx->input[10];
        j11 = ctx->input[11];
        j12 = ctx->input[12];
        j13 = ctx->input[13];
        j14 = ctx->input[14];
        j15 = ctx->input[15];
        */
        $j0  = (int) $ctx[0];
        $j1  = (int) $ctx[1];
        $j2  = (int) $ctx[2];
        $j3  = (int) $ctx[3];
        $j4  = (int) $ctx[4];
        $j5  = (int) $ctx[5];
        $j6  = (int) $ctx[6];
        $j7  = (int) $ctx[7];
        $j8  = (int) $ctx[8];
        $j9  = (int) $ctx[9];
        $j10 = (int) $ctx[10];
        $j11 = (int) $ctx[11];
        $j12 = (int) $ctx[12];
        $j13 = (int) $ctx[13];
        $j14 = (int) $ctx[14];
        $j15 = (int) $ctx[15];

        $c = '';
        for (;;) {
            if ($bytes < 64) {
                $message .= str_repeat("\x00", 64 - $bytes);
            }

            $x0 =  (int) $j0;
            $x1 =  (int) $j1;
            $x2 =  (int) $j2;
            $x3 =  (int) $j3;
            $x4 =  (int) $j4;
            $x5 =  (int) $j5;
            $x6 =  (int) $j6;
            $x7 =  (int) $j7;
            $x8 =  (int) $j8;
            $x9 =  (int) $j9;
            $x10 = (int) $j10;
            $x11 = (int) $j11;
            $x12 = (int) $j12;
            $x13 = (int) $j13;
            $x14 = (int) $j14;
            $x15 = (int) $j15;

            # for (i = 20; i > 0; i -= 2) {
            for ($i = 20; $i > 0; $i -= 2) {
                # QUARTERROUND( x0,  x4,  x8,  x12)
                list($x0, $x4, $x8, $x12) = self::quarterRound($x0, $x4, $x8, $x12);

                # QUARTERROUND( x1,  x5,  x9,  x13)
                list($x1, $x5, $x9, $x13) = self::quarterRound($x1, $x5, $x9, $x13);

                # QUARTERROUND( x2,  x6,  x10,  x14)
                list($x2, $x6, $x10, $x14) = self::quarterRound($x2, $x6, $x10, $x14);

                # QUARTERROUND( x3,  x7,  x11,  x15)
                list($x3, $x7, $x11, $x15) = self::quarterRound($x3, $x7, $x11, $x15);

                # QUARTERROUND( x0,  x5,  x10,  x15)
                list($x0, $x5, $x10, $x15) = self::quarterRound($x0, $x5, $x10, $x15);

                # QUARTERROUND( x1,  x6,  x11,  x12)
                list($x1, $x6, $x11, $x12) = self::quarterRound($x1, $x6, $x11, $x12);

                # QUARTERROUND( x2,  x7,  x8,  x13)
                list($x2, $x7, $x8, $x13) = self::quarterRound($x2, $x7, $x8, $x13);

                # QUARTERROUND( x3,  x4,  x9,  x14)
                list($x3, $x4, $x9, $x14) = self::quarterRound($x3, $x4, $x9, $x14);
            }
            /*
            x0 = PLUS(x0, j0);
            x1 = PLUS(x1, j1);
            x2 = PLUS(x2, j2);
            x3 = PLUS(x3, j3);
            x4 = PLUS(x4, j4);
            x5 = PLUS(x5, j5);
            x6 = PLUS(x6, j6);
            x7 = PLUS(x7, j7);
            x8 = PLUS(x8, j8);
            x9 = PLUS(x9, j9);
            x10 = PLUS(x10, j10);
            x11 = PLUS(x11, j11);
            x12 = PLUS(x12, j12);
            x13 = PLUS(x13, j13);
            x14 = PLUS(x14, j14);
            x15 = PLUS(x15, j15);
            */
            /** @var int $x0 */
            $x0  = ($x0 & 0xffffffff) + $j0;
            /** @var int $x1 */
            $x1  = ($x1 & 0xffffffff) + $j1;
            /** @var int $x2 */
            $x2  = ($x2 & 0xffffffff) + $j2;
            /** @var int $x3 */
            $x3  = ($x3 & 0xffffffff) + $j3;
            /** @var int $x4 */
            $x4  = ($x4 & 0xffffffff) + $j4;
            /** @var int $x5 */
            $x5  = ($x5 & 0xffffffff) + $j5;
            /** @var int $x6 */
            $x6  = ($x6 & 0xffffffff) + $j6;
            /** @var int $x7 */
            $x7  = ($x7 & 0xffffffff) + $j7;
            /** @var int $x8 */
            $x8  = ($x8 & 0xffffffff) + $j8;
            /** @var int $x9 */
            $x9  = ($x9 & 0xffffffff) + $j9;
            /** @var int $x10 */
            $x10 = ($x10 & 0xffffffff) + $j10;
            /** @var int $x11 */
            $x11 = ($x11 & 0xffffffff) + $j11;
            /** @var int $x12 */
            $x12 = ($x12 & 0xffffffff) + $j12;
            /** @var int $x13 */
            $x13 = ($x13 & 0xffffffff) + $j13;
            /** @var int $x14 */
            $x14 = ($x14 & 0xffffffff) + $j14;
            /** @var int $x15 */
            $x15 = ($x15 & 0xffffffff) + $j15;

            /*
            x0 = XOR(x0, LOAD32_LE(m + 0));
            x1 = XOR(x1, LOAD32_LE(m + 4));
            x2 = XOR(x2, LOAD32_LE(m + 8));
            x3 = XOR(x3, LOAD32_LE(m + 12));
            x4 = XOR(x4, LOAD32_LE(m + 16));
            x5 = XOR(x5, LOAD32_LE(m + 20));
            x6 = XOR(x6, LOAD32_LE(m + 24));
            x7 = XOR(x7, LOAD32_LE(m + 28));
            x8 = XOR(x8, LOAD32_LE(m + 32));
            x9 = XOR(x9, LOAD32_LE(m + 36));
            x10 = XOR(x10, LOAD32_LE(m + 40));
            x11 = XOR(x11, LOAD32_LE(m + 44));
            x12 = XOR(x12, LOAD32_LE(m + 48));
            x13 = XOR(x13, LOAD32_LE(m + 52));
            x14 = XOR(x14, LOAD32_LE(m + 56));
            x15 = XOR(x15, LOAD32_LE(m + 60));
            */
            $x0  ^= self::load_4(self::substr($message, 0, 4));
            $x1  ^= self::load_4(self::substr($message, 4, 4));
            $x2  ^= self::load_4(self::substr($message, 8, 4));
            $x3  ^= self::load_4(self::substr($message, 12, 4));
            $x4  ^= self::load_4(self::substr($message, 16, 4));
            $x5  ^= self::load_4(self::substr($message, 20, 4));
            $x6  ^= self::load_4(self::substr($message, 24, 4));
            $x7  ^= self::load_4(self::substr($message, 28, 4));
            $x8  ^= self::load_4(self::substr($message, 32, 4));
            $x9  ^= self::load_4(self::substr($message, 36, 4));
            $x10 ^= self::load_4(self::substr($message, 40, 4));
            $x11 ^= self::load_4(self::substr($message, 44, 4));
            $x12 ^= self::load_4(self::substr($message, 48, 4));
            $x13 ^= self::load_4(self::substr($message, 52, 4));
            $x14 ^= self::load_4(self::substr($message, 56, 4));
            $x15 ^= self::load_4(self::substr($message, 60, 4));

            /*
                j12 = PLUSONE(j12);
                if (!j12) {
                    j13 = PLUSONE(j13);
                }
             */
            ++$j12;
            if ($j12 & 0xf0000000) {
                throw new SodiumException('Overflow');
            }

            /*
            STORE32_LE(c + 0, x0);
            STORE32_LE(c + 4, x1);
            STORE32_LE(c + 8, x2);
            STORE32_LE(c + 12, x3);
            STORE32_LE(c + 16, x4);
            STORE32_LE(c + 20, x5);
            STORE32_LE(c + 24, x6);
            STORE32_LE(c + 28, x7);
            STORE32_LE(c + 32, x8);
            STORE32_LE(c + 36, x9);
            STORE32_LE(c + 40, x10);
            STORE32_LE(c + 44, x11);
            STORE32_LE(c + 48, x12);
            STORE32_LE(c + 52, x13);
            STORE32_LE(c + 56, x14);
            STORE32_LE(c + 60, x15);
            */
            $block = self::store32_le((int) ($x0  & 0xffffffff)) .
                 self::store32_le((int) ($x1  & 0xffffffff)) .
                 self::store32_le((int) ($x2  & 0xffffffff)) .
                 self::store32_le((int) ($x3  & 0xffffffff)) .
                 self::store32_le((int) ($x4  & 0xffffffff)) .
                 self::store32_le((int) ($x5  & 0xffffffff)) .
                 self::store32_le((int) ($x6  & 0xffffffff)) .
                 self::store32_le((int) ($x7  & 0xffffffff)) .
                 self::store32_le((int) ($x8  & 0xffffffff)) .
                 self::store32_le((int) ($x9  & 0xffffffff)) .
                 self::store32_le((int) ($x10 & 0xffffffff)) .
                 self::store32_le((int) ($x11 & 0xffffffff)) .
                 self::store32_le((int) ($x12 & 0xffffffff)) .
                 self::store32_le((int) ($x13 & 0xffffffff)) .
                 self::store32_le((int) ($x14 & 0xffffffff)) .
                 self::store32_le((int) ($x15 & 0xffffffff));

            /* Partial block */
            if ($bytes < 64) {
                $c .= self::substr($block, 0, $bytes);
                break;
            }

            /* Full block */
            $c .= $block;
            $bytes -= 64;
            if ($bytes <= 0) {
                break;
            }
            $message = self::substr($message, 64);
        }
        /* end for(;;) loop */

        $ctx[12] = $j12;
        $ctx[13] = $j13;
        return $c;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param int $len
     * @param string $nonce
     * @param string $key
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function stream($len = 64, $nonce = '', $key = '')
    {
        return self::encryptBytes(
            new ParagonIE_Sodium_Core_ChaCha20_Ctx($key, $nonce),
            str_repeat("\x00", $len)
        );
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param int $len
     * @param string $nonce
     * @param string $key
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function ietfStream($len, $nonce = '', $key = '')
    {
        return self::encryptBytes(
            new ParagonIE_Sodium_Core_ChaCha20_IetfCtx($key, $nonce),
            str_repeat("\x00", $len)
        );
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $message
     * @param string $nonce
     * @param string $key
     * @param string $ic
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function ietfStreamXorIc($message, $nonce = '', $key = '', $ic = '')
    {
        return self::encryptBytes(
            new ParagonIE_Sodium_Core_ChaCha20_IetfCtx($key, $nonce, $ic),
            $message
        );
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $message
     * @param string $nonce
     * @param string $key
     * @param string $ic
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function streamXorIc($message, $nonce = '', $key = '', $ic = '')
    {
        return self::encryptBytes(
            new ParagonIE_Sodium_Core_ChaCha20_Ctx($key, $nonce, $ic),
            $message
        );
    }
}
PK������Z�Ӂ�&��&����Poly1305.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_Poly1305', false)) {
    return;
}

/**
 * Class ParagonIE_Sodium_Core_Poly1305
 */
abstract class ParagonIE_Sodium_Core_Poly1305 extends ParagonIE_Sodium_Core_Util
{
    const BLOCK_SIZE = 16;

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $m
     * @param string $key
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function onetimeauth($m, $key)
    {
        if (self::strlen($key) < 32) {
            throw new InvalidArgumentException(
                'Key must be 32 bytes long.'
            );
        }
        $state = new ParagonIE_Sodium_Core_Poly1305_State(
            self::substr($key, 0, 32)
        );
        return $state
            ->update($m)
            ->finish();
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $mac
     * @param string $m
     * @param string $key
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     */
    public static function onetimeauth_verify($mac, $m, $key)
    {
        if (self::strlen($key) < 32) {
            throw new InvalidArgumentException(
                'Key must be 32 bytes long.'
            );
        }
        $state = new ParagonIE_Sodium_Core_Poly1305_State(
            self::substr($key, 0, 32)
        );
        $calc = $state
            ->update($m)
            ->finish();
        return self::verify_16($calc, $mac);
    }
}
PK������ZC��Df��f����ChaCha20/Ctx.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_ChaCha20_Ctx', false)) {
    return;
}

/**
 * Class ParagonIE_Sodium_Core_ChaCha20_Ctx
 */
class ParagonIE_Sodium_Core_ChaCha20_Ctx extends ParagonIE_Sodium_Core_Util implements ArrayAccess
{
    /**
     * @var SplFixedArray internally, <int, int>
     */
    protected $container;

    /**
     * ParagonIE_Sodium_Core_ChaCha20_Ctx constructor.
     *
     * @internal You should not use this directly from another application
     *
     * @param string $key     ChaCha20 key.
     * @param string $iv      Initialization Vector (a.k.a. nonce).
     * @param string $counter The initial counter value.
     *                        Defaults to 8 0x00 bytes.
     * @throws InvalidArgumentException
     * @throws TypeError
     */
    public function __construct($key = '', $iv = '', $counter = '')
    {
        if (self::strlen($key) !== 32) {
            throw new InvalidArgumentException('ChaCha20 expects a 256-bit key.');
        }
        if (self::strlen($iv) !== 8) {
            throw new InvalidArgumentException('ChaCha20 expects a 64-bit nonce.');
        }
        $this->container = new SplFixedArray(16);

        /* "expand 32-byte k" as per ChaCha20 spec */
        $this->container[0]  = 0x61707865;
        $this->container[1]  = 0x3320646e;
        $this->container[2]  = 0x79622d32;
        $this->container[3]  = 0x6b206574;
        $this->container[4]  = self::load_4(self::substr($key, 0, 4));
        $this->container[5]  = self::load_4(self::substr($key, 4, 4));
        $this->container[6]  = self::load_4(self::substr($key, 8, 4));
        $this->container[7]  = self::load_4(self::substr($key, 12, 4));
        $this->container[8]  = self::load_4(self::substr($key, 16, 4));
        $this->container[9]  = self::load_4(self::substr($key, 20, 4));
        $this->container[10] = self::load_4(self::substr($key, 24, 4));
        $this->container[11] = self::load_4(self::substr($key, 28, 4));

        if (empty($counter)) {
            $this->container[12] = 0;
            $this->container[13] = 0;
        } else {
            $this->container[12] = self::load_4(self::substr($counter, 0, 4));
            $this->container[13] = self::load_4(self::substr($counter, 4, 4));
        }
        $this->container[14] = self::load_4(self::substr($iv, 0, 4));
        $this->container[15] = self::load_4(self::substr($iv, 4, 4));
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param int $offset
     * @param int $value
     * @return void
     * @psalm-suppress MixedArrayOffset
     */
    #[ReturnTypeWillChange]
    public function offsetSet($offset, $value)
    {
        if (!is_int($offset)) {
            throw new InvalidArgumentException('Expected an integer');
        }
        if (!is_int($value)) {
            throw new InvalidArgumentException('Expected an integer');
        }
        $this->container[$offset] = $value;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param int $offset
     * @return bool
     */
    #[ReturnTypeWillChange]
    public function offsetExists($offset)
    {
        return isset($this->container[$offset]);
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param int $offset
     * @return void
     * @psalm-suppress MixedArrayOffset
     */
    #[ReturnTypeWillChange]
    public function offsetUnset($offset)
    {
        unset($this->container[$offset]);
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param int $offset
     * @return mixed|null
     * @psalm-suppress MixedArrayOffset
     */
    #[ReturnTypeWillChange]
    public function offsetGet($offset)
    {
        return isset($this->container[$offset])
            ? $this->container[$offset]
            : null;
    }
}
PK������ZӘ�*��*����ChaCha20/IetfCtx.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_ChaCha20_IetfCtx', false)) {
    return;
}

/**
 * Class ParagonIE_Sodium_Core_ChaCha20_IetfCtx
 */
class ParagonIE_Sodium_Core_ChaCha20_IetfCtx extends ParagonIE_Sodium_Core_ChaCha20_Ctx
{
    /**
     * ParagonIE_Sodium_Core_ChaCha20_IetfCtx constructor.
     *
     * @internal You should not use this directly from another application
     *
     * @param string $key     ChaCha20 key.
     * @param string $iv      Initialization Vector (a.k.a. nonce).
     * @param string $counter The initial counter value.
     *                        Defaults to 4 0x00 bytes.
     * @throws InvalidArgumentException
     * @throws TypeError
     */
    public function __construct($key = '', $iv = '', $counter = '')
    {
        if (self::strlen($iv) !== 12) {
            throw new InvalidArgumentException('ChaCha20 expects a 96-bit nonce in IETF mode.');
        }
        parent::__construct($key, self::substr($iv, 0, 8), $counter);

        if (!empty($counter)) {
            $this->container[12] = self::load_4(self::substr($counter, 0, 4));
        }
        $this->container[13] = self::load_4(self::substr($iv, 0, 4));
        $this->container[14] = self::load_4(self::substr($iv, 4, 4));
        $this->container[15] = self::load_4(self::substr($iv, 8, 4));
    }
}
PK�����	�Z�0��) ��) ����Salsa20.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_Salsa20', false)) {
    return;
}

/**
 * Class ParagonIE_Sodium_Core_Salsa20
 */
abstract class ParagonIE_Sodium_Core_Salsa20 extends ParagonIE_Sodium_Core_Util
{
    const ROUNDS = 20;

    /**
     * Calculate an salsa20 hash of a single block
     *
     * @internal You should not use this directly from another application
     *
     * @param string $in
     * @param string $k
     * @param string|null $c
     * @return string
     * @throws TypeError
     */
    public static function core_salsa20($in, $k, $c = null)
    {
        if (self::strlen($k) < 32) {
            throw new RangeException('Key must be 32 bytes long');
        }
        if ($c === null) {
            $j0  = $x0  = 0x61707865;
            $j5  = $x5  = 0x3320646e;
            $j10 = $x10 = 0x79622d32;
            $j15 = $x15 = 0x6b206574;
        } else {
            $j0  = $x0  = self::load_4(self::substr($c, 0, 4));
            $j5  = $x5  = self::load_4(self::substr($c, 4, 4));
            $j10 = $x10 = self::load_4(self::substr($c, 8, 4));
            $j15 = $x15 = self::load_4(self::substr($c, 12, 4));
        }
        $j1  = $x1  = self::load_4(self::substr($k, 0, 4));
        $j2  = $x2  = self::load_4(self::substr($k, 4, 4));
        $j3  = $x3  = self::load_4(self::substr($k, 8, 4));
        $j4  = $x4  = self::load_4(self::substr($k, 12, 4));
        $j6  = $x6  = self::load_4(self::substr($in, 0, 4));
        $j7  = $x7  = self::load_4(self::substr($in, 4, 4));
        $j8  = $x8  = self::load_4(self::substr($in, 8, 4));
        $j9  = $x9  = self::load_4(self::substr($in, 12, 4));
        $j11 = $x11 = self::load_4(self::substr($k, 16, 4));
        $j12 = $x12 = self::load_4(self::substr($k, 20, 4));
        $j13 = $x13 = self::load_4(self::substr($k, 24, 4));
        $j14 = $x14 = self::load_4(self::substr($k, 28, 4));

        for ($i = self::ROUNDS; $i > 0; $i -= 2) {
            $x4 ^= self::rotate($x0 + $x12, 7);
            $x8 ^= self::rotate($x4 + $x0, 9);
            $x12 ^= self::rotate($x8 + $x4, 13);
            $x0 ^= self::rotate($x12 + $x8, 18);

            $x9 ^= self::rotate($x5 + $x1, 7);
            $x13 ^= self::rotate($x9 + $x5, 9);
            $x1 ^= self::rotate($x13 + $x9, 13);
            $x5 ^= self::rotate($x1 + $x13, 18);

            $x14 ^= self::rotate($x10 + $x6, 7);
            $x2 ^= self::rotate($x14 + $x10, 9);
            $x6 ^= self::rotate($x2 + $x14, 13);
            $x10 ^= self::rotate($x6 + $x2, 18);

            $x3 ^= self::rotate($x15 + $x11, 7);
            $x7 ^= self::rotate($x3 + $x15, 9);
            $x11 ^= self::rotate($x7 + $x3, 13);
            $x15 ^= self::rotate($x11 + $x7, 18);

            $x1 ^= self::rotate($x0 + $x3, 7);
            $x2 ^= self::rotate($x1 + $x0, 9);
            $x3 ^= self::rotate($x2 + $x1, 13);
            $x0 ^= self::rotate($x3 + $x2, 18);

            $x6 ^= self::rotate($x5 + $x4, 7);
            $x7 ^= self::rotate($x6 + $x5, 9);
            $x4 ^= self::rotate($x7 + $x6, 13);
            $x5 ^= self::rotate($x4 + $x7, 18);

            $x11 ^= self::rotate($x10 + $x9, 7);
            $x8 ^= self::rotate($x11 + $x10, 9);
            $x9 ^= self::rotate($x8 + $x11, 13);
            $x10 ^= self::rotate($x9 + $x8, 18);

            $x12 ^= self::rotate($x15 + $x14, 7);
            $x13 ^= self::rotate($x12 + $x15, 9);
            $x14 ^= self::rotate($x13 + $x12, 13);
            $x15 ^= self::rotate($x14 + $x13, 18);
        }

        $x0  += $j0;
        $x1  += $j1;
        $x2  += $j2;
        $x3  += $j3;
        $x4  += $j4;
        $x5  += $j5;
        $x6  += $j6;
        $x7  += $j7;
        $x8  += $j8;
        $x9  += $j9;
        $x10 += $j10;
        $x11 += $j11;
        $x12 += $j12;
        $x13 += $j13;
        $x14 += $j14;
        $x15 += $j15;

        return self::store32_le($x0) .
            self::store32_le($x1) .
            self::store32_le($x2) .
            self::store32_le($x3) .
            self::store32_le($x4) .
            self::store32_le($x5) .
            self::store32_le($x6) .
            self::store32_le($x7) .
            self::store32_le($x8) .
            self::store32_le($x9) .
            self::store32_le($x10) .
            self::store32_le($x11) .
            self::store32_le($x12) .
            self::store32_le($x13) .
            self::store32_le($x14) .
            self::store32_le($x15);
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param int $len
     * @param string $nonce
     * @param string $key
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function salsa20($len, $nonce, $key)
    {
        if (self::strlen($key) !== 32) {
            throw new RangeException('Key must be 32 bytes long');
        }
        $kcopy = '' . $key;
        $in = self::substr($nonce, 0, 8) . str_repeat("\0", 8);
        $c = '';
        while ($len >= 64) {
            $c .= self::core_salsa20($in, $kcopy, null);
            $u = 1;
            // Internal counter.
            for ($i = 8; $i < 16; ++$i) {
                $u += self::chrToInt($in[$i]);
                $in[$i] = self::intToChr($u & 0xff);
                $u >>= 8;
            }
            $len -= 64;
        }
        if ($len > 0) {
            $c .= self::substr(
                self::core_salsa20($in, $kcopy, null),
                0,
                $len
            );
        }
        try {
            ParagonIE_Sodium_Compat::memzero($kcopy);
        } catch (SodiumException $ex) {
            $kcopy = null;
        }
        return $c;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $m
     * @param string $n
     * @param int $ic
     * @param string $k
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function salsa20_xor_ic($m, $n, $ic, $k)
    {
        $mlen = self::strlen($m);
        if ($mlen < 1) {
            return '';
        }
        $kcopy = self::substr($k, 0, 32);
        $in = self::substr($n, 0, 8);
        // Initialize the counter
        $in .= ParagonIE_Sodium_Core_Util::store64_le($ic);

        $c = '';
        while ($mlen >= 64) {
            $block = self::core_salsa20($in, $kcopy, null);
            $c .= self::xorStrings(
                self::substr($m, 0, 64),
                self::substr($block, 0, 64)
            );
            $u = 1;
            for ($i = 8; $i < 16; ++$i) {
                $u += self::chrToInt($in[$i]);
                $in[$i] = self::intToChr($u & 0xff);
                $u >>= 8;
            }

            $mlen -= 64;
            $m = self::substr($m, 64);
        }

        if ($mlen) {
            $block = self::core_salsa20($in, $kcopy, null);
            $c .= self::xorStrings(
                self::substr($m, 0, $mlen),
                self::substr($block, 0, $mlen)
            );
        }
        try {
            ParagonIE_Sodium_Compat::memzero($block);
            ParagonIE_Sodium_Compat::memzero($kcopy);
        } catch (SodiumException $ex) {
            $block = null;
            $kcopy = null;
        }

        return $c;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $message
     * @param string $nonce
     * @param string $key
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function salsa20_xor($message, $nonce, $key)
    {
        return self::xorStrings(
            $message,
            self::salsa20(
                self::strlen($message),
                $nonce,
                $key
            )
        );
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param int $u
     * @param int $c
     * @return int
     */
    public static function rotate($u, $c)
    {
        $u &= 0xffffffff;
        $c %= 32;
        return (int) (0xffffffff & (
                ($u << $c)
                    |
                ($u >> (32 - $c))
            )
        );
    }
}
PK�����	�Z�R>�p���p����Util.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_Util', false)) {
    return;
}

/**
 * Class ParagonIE_Sodium_Core_Util
 */
abstract class ParagonIE_Sodium_Core_Util
{
    const U32_MAX = 0xFFFFFFFF;

    /**
     * @param int $integer
     * @param int $size (16, 32, 64)
     * @return int
     */
    public static function abs($integer, $size = 0)
    {
        /** @var int $realSize */
        $realSize = (PHP_INT_SIZE << 3) - 1;
        if ($size) {
            --$size;
        } else {
            /** @var int $size */
            $size = $realSize;
        }

        $negative = -(($integer >> $size) & 1);
        return (int) (
            ($integer ^ $negative)
                +
            (($negative >> $realSize) & 1)
        );
    }

    /**
     * @param string $a
     * @param string $b
     * @return string
     * @throws SodiumException
     */
    public static function andStrings($a, $b)
    {
        /* Type checks: */
        if (!is_string($a)) {
            throw new TypeError('Argument 1 must be a string');
        }
        if (!is_string($b)) {
            throw new TypeError('Argument 2 must be a string');
        }
        $len = self::strlen($a);
        if (self::strlen($b) !== $len) {
            throw new SodiumException('Both strings must be of equal length to combine with bitwise AND');
        }
        return $a & $b;
    }

    /**
     * Convert a binary string into a hexadecimal string without cache-timing
     * leaks
     *
     * @internal You should not use this directly from another application
     *
     * @param string $binaryString (raw binary)
     * @return string
     * @throws TypeError
     */
    public static function bin2hex($binaryString)
    {
        /* Type checks: */
        if (!is_string($binaryString)) {
            throw new TypeError('Argument 1 must be a string, ' . gettype($binaryString) . ' given.');
        }

        $hex = '';
        $len = self::strlen($binaryString);
        for ($i = 0; $i < $len; ++$i) {
            /** @var array<int, int> $chunk */
            $chunk = unpack('C', $binaryString[$i]);
            /** @var int $c */
            $c = $chunk[1] & 0xf;
            /** @var int $b */
            $b = $chunk[1] >> 4;
            $hex .= pack(
                'CC',
                (87 + $b + ((($b - 10) >> 8) & ~38)),
                (87 + $c + ((($c - 10) >> 8) & ~38))
            );
        }
        return $hex;
    }

    /**
     * Convert a binary string into a hexadecimal string without cache-timing
     * leaks, returning uppercase letters (as per RFC 4648)
     *
     * @internal You should not use this directly from another application
     *
     * @param string $bin_string (raw binary)
     * @return string
     * @throws TypeError
     */
    public static function bin2hexUpper($bin_string)
    {
        $hex = '';
        $len = self::strlen($bin_string);
        for ($i = 0; $i < $len; ++$i) {
            /** @var array<int, int> $chunk */
            $chunk = unpack('C', $bin_string[$i]);
            /**
             * Lower 16 bits
             *
             * @var int $c
             */
            $c = $chunk[1] & 0xf;

            /**
             * Upper 16 bits
             * @var int $b
             */
            $b = $chunk[1] >> 4;

            /**
             * Use pack() and binary operators to turn the two integers
             * into hexadecimal characters. We don't use chr() here, because
             * it uses a lookup table internally and we want to avoid
             * cache-timing side-channels.
             */
            $hex .= pack(
                'CC',
                (55 + $b + ((($b - 10) >> 8) & ~6)),
                (55 + $c + ((($c - 10) >> 8) & ~6))
            );
        }
        return $hex;
    }

    /**
     * Cache-timing-safe variant of ord()
     *
     * @internal You should not use this directly from another application
     *
     * @param string $chr
     * @return int
     * @throws SodiumException
     * @throws TypeError
     */
    public static function chrToInt($chr)
    {
        /* Type checks: */
        if (!is_string($chr)) {
            throw new TypeError('Argument 1 must be a string, ' . gettype($chr) . ' given.');
        }
        if (self::strlen($chr) !== 1) {
            throw new SodiumException('chrToInt() expects a string that is exactly 1 character long');
        }
        /** @var array<int, int> $chunk */
        $chunk = unpack('C', $chr);
        return (int) ($chunk[1]);
    }

    /**
     * Compares two strings.
     *
     * @internal You should not use this directly from another application
     *
     * @param string $left
     * @param string $right
     * @param int $len
     * @return int
     * @throws SodiumException
     * @throws TypeError
     */
    public static function compare($left, $right, $len = null)
    {
        $leftLen = self::strlen($left);
        $rightLen = self::strlen($right);
        if ($len === null) {
            $len = max($leftLen, $rightLen);
            $left = str_pad($left, $len, "\x00", STR_PAD_RIGHT);
            $right = str_pad($right, $len, "\x00", STR_PAD_RIGHT);
        }

        $gt = 0;
        $eq = 1;
        $i = $len;
        while ($i !== 0) {
            --$i;
            $gt |= ((self::chrToInt($right[$i]) - self::chrToInt($left[$i])) >> 8) & $eq;
            $eq &= ((self::chrToInt($right[$i]) ^ self::chrToInt($left[$i])) - 1) >> 8;
        }
        return ($gt + $gt + $eq) - 1;
    }

    /**
     * If a variable does not match a given type, throw a TypeError.
     *
     * @param mixed $mixedVar
     * @param string $type
     * @param int $argumentIndex
     * @throws TypeError
     * @throws SodiumException
     * @return void
     */
    public static function declareScalarType(&$mixedVar = null, $type = 'void', $argumentIndex = 0)
    {
        if (func_num_args() === 0) {
            /* Tautology, by default */
            return;
        }
        if (func_num_args() === 1) {
            throw new TypeError('Declared void, but passed a variable');
        }
        $realType = strtolower(gettype($mixedVar));
        $type = strtolower($type);
        switch ($type) {
            case 'null':
                if ($mixedVar !== null) {
                    throw new TypeError('Argument ' . $argumentIndex . ' must be null, ' . $realType . ' given.');
                }
                break;
            case 'integer':
            case 'int':
                $allow = array('int', 'integer');
                if (!in_array($type, $allow)) {
                    throw new TypeError('Argument ' . $argumentIndex . ' must be an integer, ' . $realType . ' given.');
                }
                $mixedVar = (int) $mixedVar;
                break;
            case 'boolean':
            case 'bool':
                $allow = array('bool', 'boolean');
                if (!in_array($type, $allow)) {
                    throw new TypeError('Argument ' . $argumentIndex . ' must be a boolean, ' . $realType . ' given.');
                }
                $mixedVar = (bool) $mixedVar;
                break;
            case 'string':
                if (!is_string($mixedVar)) {
                    throw new TypeError('Argument ' . $argumentIndex . ' must be a string, ' . $realType . ' given.');
                }
                $mixedVar = (string) $mixedVar;
                break;
            case 'decimal':
            case 'double':
            case 'float':
                $allow = array('decimal', 'double', 'float');
                if (!in_array($type, $allow)) {
                    throw new TypeError('Argument ' . $argumentIndex . ' must be a float, ' . $realType . ' given.');
                }
                $mixedVar = (float) $mixedVar;
                break;
            case 'object':
                if (!is_object($mixedVar)) {
                    throw new TypeError('Argument ' . $argumentIndex . ' must be an object, ' . $realType . ' given.');
                }
                break;
            case 'array':
                if (!is_array($mixedVar)) {
                    if (is_object($mixedVar)) {
                        if ($mixedVar instanceof ArrayAccess) {
                            return;
                        }
                    }
                    throw new TypeError('Argument ' . $argumentIndex . ' must be an array, ' . $realType . ' given.');
                }
                break;
            default:
                throw new SodiumException('Unknown type (' . $realType .') does not match expect type (' . $type . ')');
        }
    }

    /**
     * Evaluate whether or not two strings are equal (in constant-time)
     *
     * @param string $left
     * @param string $right
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     */
    public static function hashEquals($left, $right)
    {
        /* Type checks: */
        if (!is_string($left)) {
            throw new TypeError('Argument 1 must be a string, ' . gettype($left) . ' given.');
        }
        if (!is_string($right)) {
            throw new TypeError('Argument 2 must be a string, ' . gettype($right) . ' given.');
        }

        if (is_callable('hash_equals')) {
            return hash_equals($left, $right);
        }
        $d = 0;
        /** @var int $len */
        $len = self::strlen($left);
        if ($len !== self::strlen($right)) {
            return false;
        }
        for ($i = 0; $i < $len; ++$i) {
            $d |= self::chrToInt($left[$i]) ^ self::chrToInt($right[$i]);
        }

        if ($d !== 0) {
            return false;
        }
        return $left === $right;
    }

    /**
     * Catch hash_update() failures and throw instead of silently proceeding
     *
     * @param HashContext|resource &$hs
     * @param string $data
     * @return void
     * @throws SodiumException
     * @psalm-suppress PossiblyInvalidArgument
     */
    protected static function hash_update(&$hs, $data)
    {
        if (!hash_update($hs, $data)) {
            throw new SodiumException('hash_update() failed');
        }
    }

    /**
     * Convert a hexadecimal string into a binary string without cache-timing
     * leaks
     *
     * @internal You should not use this directly from another application
     *
     * @param string $hexString
     * @param string $ignore
     * @param bool $strictPadding
     * @return string (raw binary)
     * @throws RangeException
     * @throws TypeError
     */
    public static function hex2bin($hexString, $ignore = '', $strictPadding = false)
    {
        /* Type checks: */
        if (!is_string($hexString)) {
            throw new TypeError('Argument 1 must be a string, ' . gettype($hexString) . ' given.');
        }
        if (!is_string($ignore)) {
            throw new TypeError('Argument 2 must be a string, ' . gettype($hexString) . ' given.');
        }

        $hex_pos = 0;
        $bin = '';
        $c_acc = 0;
        $hex_len = self::strlen($hexString);
        $state = 0;
        if (($hex_len & 1) !== 0) {
            if ($strictPadding) {
                throw new RangeException(
                    'Expected an even number of hexadecimal characters'
                );
            } else {
                $hexString = '0' . $hexString;
                ++$hex_len;
            }
        }

        $chunk = unpack('C*', $hexString);
        while ($hex_pos < $hex_len) {
            ++$hex_pos;
            /** @var int $c */
            $c = $chunk[$hex_pos];
            $c_num = $c ^ 48;
            $c_num0 = ($c_num - 10) >> 8;
            $c_alpha = ($c & ~32) - 55;
            $c_alpha0 = (($c_alpha - 10) ^ ($c_alpha - 16)) >> 8;
            if (($c_num0 | $c_alpha0) === 0) {
                if ($ignore && $state === 0 && strpos($ignore, self::intToChr($c)) !== false) {
                    continue;
                }
                throw new RangeException(
                    'hex2bin() only expects hexadecimal characters'
                );
            }
            $c_val = ($c_num0 & $c_num) | ($c_alpha & $c_alpha0);
            if ($state === 0) {
                $c_acc = $c_val * 16;
            } else {
                $bin .= pack('C', $c_acc | $c_val);
            }
            $state ^= 1;
        }
        return $bin;
    }

    /**
     * Turn an array of integers into a string
     *
     * @internal You should not use this directly from another application
     *
     * @param array<int, int> $ints
     * @return string
     */
    public static function intArrayToString(array $ints)
    {
        $args = $ints;
        foreach ($args as $i => $v) {
            $args[$i] = (int) ($v & 0xff);
        }
        array_unshift($args, str_repeat('C', count($ints)));
        return (string) (call_user_func_array('pack', $args));
    }

    /**
     * Cache-timing-safe variant of ord()
     *
     * @internal You should not use this directly from another application
     *
     * @param int $int
     * @return string
     * @throws TypeError
     */
    public static function intToChr($int)
    {
        return pack('C', $int);
    }

    /**
     * Load a 3 character substring into an integer
     *
     * @internal You should not use this directly from another application
     *
     * @param string $string
     * @return int
     * @throws RangeException
     * @throws TypeError
     */
    public static function load_3($string)
    {
        /* Type checks: */
        if (!is_string($string)) {
            throw new TypeError('Argument 1 must be a string, ' . gettype($string) . ' given.');
        }

        /* Input validation: */
        if (self::strlen($string) < 3) {
            throw new RangeException(
                'String must be 3 bytes or more; ' . self::strlen($string) . ' given.'
            );
        }
        /** @var array<int, int> $unpacked */
        $unpacked = unpack('V', $string . "\0");
        return (int) ($unpacked[1] & 0xffffff);
    }

    /**
     * Load a 4 character substring into an integer
     *
     * @internal You should not use this directly from another application
     *
     * @param string $string
     * @return int
     * @throws RangeException
     * @throws TypeError
     */
    public static function load_4($string)
    {
        /* Type checks: */
        if (!is_string($string)) {
            throw new TypeError('Argument 1 must be a string, ' . gettype($string) . ' given.');
        }

        /* Input validation: */
        if (self::strlen($string) < 4) {
            throw new RangeException(
                'String must be 4 bytes or more; ' . self::strlen($string) . ' given.'
            );
        }
        /** @var array<int, int> $unpacked */
        $unpacked = unpack('V', $string);
        return (int) $unpacked[1];
    }

    /**
     * Load a 8 character substring into an integer
     *
     * @internal You should not use this directly from another application
     *
     * @param string $string
     * @return int
     * @throws RangeException
     * @throws SodiumException
     * @throws TypeError
     */
    public static function load64_le($string)
    {
        /* Type checks: */
        if (!is_string($string)) {
            throw new TypeError('Argument 1 must be a string, ' . gettype($string) . ' given.');
        }

        /* Input validation: */
        if (self::strlen($string) < 4) {
            throw new RangeException(
                'String must be 4 bytes or more; ' . self::strlen($string) . ' given.'
            );
        }
        if (PHP_VERSION_ID >= 50603 && PHP_INT_SIZE === 8) {
            /** @var array<int, int> $unpacked */
            $unpacked = unpack('P', $string);
            return (int) $unpacked[1];
        }

        /** @var int $result */
        $result  = (self::chrToInt($string[0]) & 0xff);
        $result |= (self::chrToInt($string[1]) & 0xff) <<  8;
        $result |= (self::chrToInt($string[2]) & 0xff) << 16;
        $result |= (self::chrToInt($string[3]) & 0xff) << 24;
        $result |= (self::chrToInt($string[4]) & 0xff) << 32;
        $result |= (self::chrToInt($string[5]) & 0xff) << 40;
        $result |= (self::chrToInt($string[6]) & 0xff) << 48;
        $result |= (self::chrToInt($string[7]) & 0xff) << 56;
        return (int) $result;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $left
     * @param string $right
     * @return int
     * @throws SodiumException
     * @throws TypeError
     */
    public static function memcmp($left, $right)
    {
        if (self::hashEquals($left, $right)) {
            return 0;
        }
        return -1;
    }

    /**
     * Multiply two integers in constant-time
     *
     * Micro-architecture timing side-channels caused by how your CPU
     * implements multiplication are best prevented by never using the
     * multiplication operators and ensuring that our code always takes
     * the same number of operations to complete, regardless of the values
     * of $a and $b.
     *
     * @internal You should not use this directly from another application
     *
     * @param int $a
     * @param int $b
     * @param int $size Limits the number of operations (useful for small,
     *                  constant operands)
     * @return int
     */
    public static function mul($a, $b, $size = 0)
    {
        if (ParagonIE_Sodium_Compat::$fastMult) {
            return (int) ($a * $b);
        }

        static $defaultSize = null;
        /** @var int $defaultSize */
        if (!$defaultSize) {
            /** @var int $defaultSize */
            $defaultSize = (PHP_INT_SIZE << 3) - 1;
        }
        if ($size < 1) {
            /** @var int $size */
            $size = $defaultSize;
        }
        /** @var int $size */

        $c = 0;

        /**
         * Mask is either -1 or 0.
         *
         * -1 in binary looks like 0x1111 ... 1111
         *  0 in binary looks like 0x0000 ... 0000
         *
         * @var int
         */
        $mask = -(($b >> ((int) $defaultSize)) & 1);

        /**
         * Ensure $b is a positive integer, without creating
         * a branching side-channel
         *
         * @var int $b
         */
        $b = ($b & ~$mask) | ($mask & -$b);

        /**
         * Unless $size is provided:
         *
         * This loop always runs 32 times when PHP_INT_SIZE is 4.
         * This loop always runs 64 times when PHP_INT_SIZE is 8.
         */
        for ($i = $size; $i >= 0; --$i) {
            $c += (int) ($a & -($b & 1));
            $a <<= 1;
            $b >>= 1;
        }
        $c = (int) @($c & -1);

        /**
         * If $b was negative, we then apply the same value to $c here.
         * It doesn't matter much if $a was negative; the $c += above would
         * have produced a negative integer to begin with. But a negative $b
         * makes $b >>= 1 never return 0, so we would end up with incorrect
         * results.
         *
         * The end result is what we'd expect from integer multiplication.
         */
        return (int) (($c & ~$mask) | ($mask & -$c));
    }

    /**
     * Convert any arbitrary numbers into two 32-bit integers that represent
     * a 64-bit integer.
     *
     * @internal You should not use this directly from another application
     *
     * @param int|float $num
     * @return array<int, int>
     */
    public static function numericTo64BitInteger($num)
    {
        $high = 0;
        /** @var int $low */
        if (PHP_INT_SIZE === 4) {
            $low = (int) $num;
        } else {
            $low = $num & 0xffffffff;
        }

        if ((+(abs($num))) >= 1) {
            if ($num > 0) {
                /** @var int $high */
                $high = min((+(floor($num/4294967296))), 4294967295);
            } else {
                /** @var int $high */
                $high = ~~((+(ceil(($num - (+((~~($num)))))/4294967296))));
            }
        }
        return array((int) $high, (int) $low);
    }

    /**
     * Store a 24-bit integer into a string, treating it as big-endian.
     *
     * @internal You should not use this directly from another application
     *
     * @param int $int
     * @return string
     * @throws TypeError
     */
    public static function store_3($int)
    {
        /* Type checks: */
        if (!is_int($int)) {
            if (is_numeric($int)) {
                $int = (int) $int;
            } else {
                throw new TypeError('Argument 1 must be an integer, ' . gettype($int) . ' given.');
            }
        }
        /** @var string $packed */
        $packed = pack('N', $int);
        return self::substr($packed, 1, 3);
    }

    /**
     * Store a 32-bit integer into a string, treating it as little-endian.
     *
     * @internal You should not use this directly from another application
     *
     * @param int $int
     * @return string
     * @throws TypeError
     */
    public static function store32_le($int)
    {
        /* Type checks: */
        if (!is_int($int)) {
            if (is_numeric($int)) {
                $int = (int) $int;
            } else {
                throw new TypeError('Argument 1 must be an integer, ' . gettype($int) . ' given.');
            }
        }

        /** @var string $packed */
        $packed = pack('V', $int);
        return $packed;
    }

    /**
     * Store a 32-bit integer into a string, treating it as big-endian.
     *
     * @internal You should not use this directly from another application
     *
     * @param int $int
     * @return string
     * @throws TypeError
     */
    public static function store_4($int)
    {
        /* Type checks: */
        if (!is_int($int)) {
            if (is_numeric($int)) {
                $int = (int) $int;
            } else {
                throw new TypeError('Argument 1 must be an integer, ' . gettype($int) . ' given.');
            }
        }

        /** @var string $packed */
        $packed = pack('N', $int);
        return $packed;
    }

    /**
     * Stores a 64-bit integer as an string, treating it as little-endian.
     *
     * @internal You should not use this directly from another application
     *
     * @param int $int
     * @return string
     * @throws TypeError
     */
    public static function store64_le($int)
    {
        /* Type checks: */
        if (!is_int($int)) {
            if (is_numeric($int)) {
                $int = (int) $int;
            } else {
                throw new TypeError('Argument 1 must be an integer, ' . gettype($int) . ' given.');
            }
        }

        if (PHP_INT_SIZE === 8) {
            if (PHP_VERSION_ID >= 50603) {
                /** @var string $packed */
                $packed = pack('P', $int);
                return $packed;
            }
            return self::intToChr($int & 0xff) .
                self::intToChr(($int >>  8) & 0xff) .
                self::intToChr(($int >> 16) & 0xff) .
                self::intToChr(($int >> 24) & 0xff) .
                self::intToChr(($int >> 32) & 0xff) .
                self::intToChr(($int >> 40) & 0xff) .
                self::intToChr(($int >> 48) & 0xff) .
                self::intToChr(($int >> 56) & 0xff);
        }
        if ($int > PHP_INT_MAX) {
            list($hiB, $int) = self::numericTo64BitInteger($int);
        } else {
            $hiB = 0;
        }
        return
            self::intToChr(($int      ) & 0xff) .
            self::intToChr(($int >>  8) & 0xff) .
            self::intToChr(($int >> 16) & 0xff) .
            self::intToChr(($int >> 24) & 0xff) .
            self::intToChr($hiB & 0xff) .
            self::intToChr(($hiB >>  8) & 0xff) .
            self::intToChr(($hiB >> 16) & 0xff) .
            self::intToChr(($hiB >> 24) & 0xff);
    }

    /**
     * Safe string length
     *
     * @internal You should not use this directly from another application
     *
     * @ref mbstring.func_overload
     *
     * @param string $str
     * @return int
     * @throws TypeError
     */
    public static function strlen($str)
    {
        /* Type checks: */
        if (!is_string($str)) {
            throw new TypeError('String expected');
        }

        return (int) (
        self::isMbStringOverride()
            ? mb_strlen($str, '8bit')
            : strlen($str)
        );
    }

    /**
     * Turn a string into an array of integers
     *
     * @internal You should not use this directly from another application
     *
     * @param string $string
     * @return array<int, int>
     * @throws TypeError
     */
    public static function stringToIntArray($string)
    {
        if (!is_string($string)) {
            throw new TypeError('String expected');
        }
        /**
         * @var array<int, int>
         */
        $values = array_values(
            unpack('C*', $string)
        );
        return $values;
    }

    /**
     * Safe substring
     *
     * @internal You should not use this directly from another application
     *
     * @ref mbstring.func_overload
     *
     * @param string $str
     * @param int $start
     * @param int $length
     * @return string
     * @throws TypeError
     */
    public static function substr($str, $start = 0, $length = null)
    {
        /* Type checks: */
        if (!is_string($str)) {
            throw new TypeError('String expected');
        }

        if ($length === 0) {
            return '';
        }

        if (self::isMbStringOverride()) {
            if (PHP_VERSION_ID < 50400 && $length === null) {
                $length = self::strlen($str);
            }
            $sub = (string) mb_substr($str, $start, $length, '8bit');
        } elseif ($length === null) {
            $sub = (string) substr($str, $start);
        } else {
            $sub = (string) substr($str, $start, $length);
        }
        if ($sub !== '') {
            return $sub;
        }
        return '';
    }

    /**
     * Compare a 16-character byte string in constant time.
     *
     * @internal You should not use this directly from another application
     *
     * @param string $a
     * @param string $b
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     */
    public static function verify_16($a, $b)
    {
        /* Type checks: */
        if (!is_string($a)) {
            throw new TypeError('String expected');
        }
        if (!is_string($b)) {
            throw new TypeError('String expected');
        }
        return self::hashEquals(
            self::substr($a, 0, 16),
            self::substr($b, 0, 16)
        );
    }

    /**
     * Compare a 32-character byte string in constant time.
     *
     * @internal You should not use this directly from another application
     *
     * @param string $a
     * @param string $b
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     */
    public static function verify_32($a, $b)
    {
        /* Type checks: */
        if (!is_string($a)) {
            throw new TypeError('String expected');
        }
        if (!is_string($b)) {
            throw new TypeError('String expected');
        }
        return self::hashEquals(
            self::substr($a, 0, 32),
            self::substr($b, 0, 32)
        );
    }

    /**
     * Calculate $a ^ $b for two strings.
     *
     * @internal You should not use this directly from another application
     *
     * @param string $a
     * @param string $b
     * @return string
     * @throws TypeError
     */
    public static function xorStrings($a, $b)
    {
        /* Type checks: */
        if (!is_string($a)) {
            throw new TypeError('Argument 1 must be a string');
        }
        if (!is_string($b)) {
            throw new TypeError('Argument 2 must be a string');
        }

        return (string) ($a ^ $b);
    }

    /**
     * Returns whether or not mbstring.func_overload is in effect.
     *
     * @internal You should not use this directly from another application
     *
     * Note: MB_OVERLOAD_STRING === 2, but we don't reference the constant
     * (for nuisance-free PHP 8 support)
     *
     * @return bool
     */
    protected static function isMbStringOverride()
    {
        static $mbstring = null;

        if ($mbstring === null) {
            if (!defined('MB_OVERLOAD_STRING')) {
                $mbstring = false;
                return $mbstring;
            }
            $mbstring = extension_loaded('mbstring')
                && defined('MB_OVERLOAD_STRING')
                &&
            ((int) (ini_get('mbstring.func_overload')) & 2);
            // MB_OVERLOAD_STRING === 2
        }
        /** @var bool $mbstring */

        return $mbstring;
    }
}
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if (class_exists('ParagonIE_Sodium_Core_AES', false)) {
    return;
}

/**
 * Bitsliced implementation of the AES block cipher.
 *
 * Based on the implementation provided by BearSSL.
 *
 * @internal This should only be used by sodium_compat
 */
class ParagonIE_Sodium_Core_AES extends ParagonIE_Sodium_Core_Util
{
    /**
     * @var int[] AES round constants
     */
    private static $Rcon = array(
        0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1B, 0x36
    );

    /**
     * Mutates the values of $q!
     *
     * @param ParagonIE_Sodium_Core_AES_Block $q
     * @return void
     */
    public static function sbox(ParagonIE_Sodium_Core_AES_Block $q)
    {
        /**
         * @var int $x0
         * @var int $x1
         * @var int $x2
         * @var int $x3
         * @var int $x4
         * @var int $x5
         * @var int $x6
         * @var int $x7
         */
        $x0 = $q[7] & self::U32_MAX;
        $x1 = $q[6] & self::U32_MAX;
        $x2 = $q[5] & self::U32_MAX;
        $x3 = $q[4] & self::U32_MAX;
        $x4 = $q[3] & self::U32_MAX;
        $x5 = $q[2] & self::U32_MAX;
        $x6 = $q[1] & self::U32_MAX;
        $x7 = $q[0] & self::U32_MAX;

        $y14 = $x3 ^ $x5;
        $y13 = $x0 ^ $x6;
        $y9 = $x0 ^ $x3;
        $y8 = $x0 ^ $x5;
        $t0 = $x1 ^ $x2;
        $y1 = $t0 ^ $x7;
        $y4 = $y1 ^ $x3;
        $y12 = $y13 ^ $y14;
        $y2 = $y1 ^ $x0;
        $y5 = $y1 ^ $x6;
        $y3 = $y5 ^ $y8;
        $t1 = $x4 ^ $y12;
        $y15 = $t1 ^ $x5;
        $y20 = $t1 ^ $x1;
        $y6 = $y15 ^ $x7;
        $y10 = $y15 ^ $t0;
        $y11 = $y20 ^ $y9;
        $y7 = $x7 ^ $y11;
        $y17 = $y10 ^ $y11;
        $y19 = $y10 ^ $y8;
        $y16 = $t0 ^ $y11;
        $y21 = $y13 ^ $y16;
        $y18 = $x0 ^ $y16;

        /*
         * Non-linear section.
         */
        $t2 = $y12 & $y15;
        $t3 = $y3 & $y6;
        $t4 = $t3 ^ $t2;
        $t5 = $y4 & $x7;
        $t6 = $t5 ^ $t2;
        $t7 = $y13 & $y16;
        $t8 = $y5 & $y1;
        $t9 = $t8 ^ $t7;
        $t10 = $y2 & $y7;
        $t11 = $t10 ^ $t7;
        $t12 = $y9 & $y11;
        $t13 = $y14 & $y17;
        $t14 = $t13 ^ $t12;
        $t15 = $y8 & $y10;
        $t16 = $t15 ^ $t12;
        $t17 = $t4 ^ $t14;
        $t18 = $t6 ^ $t16;
        $t19 = $t9 ^ $t14;
        $t20 = $t11 ^ $t16;
        $t21 = $t17 ^ $y20;
        $t22 = $t18 ^ $y19;
        $t23 = $t19 ^ $y21;
        $t24 = $t20 ^ $y18;

        $t25 = $t21 ^ $t22;
        $t26 = $t21 & $t23;
        $t27 = $t24 ^ $t26;
        $t28 = $t25 & $t27;
        $t29 = $t28 ^ $t22;
        $t30 = $t23 ^ $t24;
        $t31 = $t22 ^ $t26;
        $t32 = $t31 & $t30;
        $t33 = $t32 ^ $t24;
        $t34 = $t23 ^ $t33;
        $t35 = $t27 ^ $t33;
        $t36 = $t24 & $t35;
        $t37 = $t36 ^ $t34;
        $t38 = $t27 ^ $t36;
        $t39 = $t29 & $t38;
        $t40 = $t25 ^ $t39;

        $t41 = $t40 ^ $t37;
        $t42 = $t29 ^ $t33;
        $t43 = $t29 ^ $t40;
        $t44 = $t33 ^ $t37;
        $t45 = $t42 ^ $t41;
        $z0 = $t44 & $y15;
        $z1 = $t37 & $y6;
        $z2 = $t33 & $x7;
        $z3 = $t43 & $y16;
        $z4 = $t40 & $y1;
        $z5 = $t29 & $y7;
        $z6 = $t42 & $y11;
        $z7 = $t45 & $y17;
        $z8 = $t41 & $y10;
        $z9 = $t44 & $y12;
        $z10 = $t37 & $y3;
        $z11 = $t33 & $y4;
        $z12 = $t43 & $y13;
        $z13 = $t40 & $y5;
        $z14 = $t29 & $y2;
        $z15 = $t42 & $y9;
        $z16 = $t45 & $y14;
        $z17 = $t41 & $y8;

        /*
         * Bottom linear transformation.
         */
        $t46 = $z15 ^ $z16;
        $t47 = $z10 ^ $z11;
        $t48 = $z5 ^ $z13;
        $t49 = $z9 ^ $z10;
        $t50 = $z2 ^ $z12;
        $t51 = $z2 ^ $z5;
        $t52 = $z7 ^ $z8;
        $t53 = $z0 ^ $z3;
        $t54 = $z6 ^ $z7;
        $t55 = $z16 ^ $z17;
        $t56 = $z12 ^ $t48;
        $t57 = $t50 ^ $t53;
        $t58 = $z4 ^ $t46;
        $t59 = $z3 ^ $t54;
        $t60 = $t46 ^ $t57;
        $t61 = $z14 ^ $t57;
        $t62 = $t52 ^ $t58;
        $t63 = $t49 ^ $t58;
        $t64 = $z4 ^ $t59;
        $t65 = $t61 ^ $t62;
        $t66 = $z1 ^ $t63;
        $s0 = $t59 ^ $t63;
        $s6 = $t56 ^ ~$t62;
        $s7 = $t48 ^ ~$t60;
        $t67 = $t64 ^ $t65;
        $s3 = $t53 ^ $t66;
        $s4 = $t51 ^ $t66;
        $s5 = $t47 ^ $t65;
        $s1 = $t64 ^ ~$s3;
        $s2 = $t55 ^ ~$t67;

        $q[7] = $s0 & self::U32_MAX;
        $q[6] = $s1 & self::U32_MAX;
        $q[5] = $s2 & self::U32_MAX;
        $q[4] = $s3 & self::U32_MAX;
        $q[3] = $s4 & self::U32_MAX;
        $q[2] = $s5 & self::U32_MAX;
        $q[1] = $s6 & self::U32_MAX;
        $q[0] = $s7 & self::U32_MAX;
    }

    /**
     * Mutates the values of $q!
     *
     * @param ParagonIE_Sodium_Core_AES_Block $q
     * @return void
     */
    public static function invSbox(ParagonIE_Sodium_Core_AES_Block $q)
    {
        self::processInversion($q);
        self::sbox($q);
        self::processInversion($q);
    }

    /**
     * This is some boilerplate code needed to invert an S-box. Rather than repeat the code
     * twice, I moved it to a protected method.
     *
     * Mutates $q
     *
     * @param ParagonIE_Sodium_Core_AES_Block $q
     * @return void
     */
    protected static function processInversion(ParagonIE_Sodium_Core_AES_Block $q)
    {
        $q0 = (~$q[0]) & self::U32_MAX;
        $q1 = (~$q[1]) & self::U32_MAX;
        $q2 = $q[2] & self::U32_MAX;
        $q3 = $q[3] & self::U32_MAX;
        $q4 = $q[4] & self::U32_MAX;
        $q5 = (~$q[5])  & self::U32_MAX;
        $q6 = (~$q[6])  & self::U32_MAX;
        $q7 = $q[7] & self::U32_MAX;
        $q[7] = ($q1 ^ $q4 ^ $q6) & self::U32_MAX;
        $q[6] = ($q0 ^ $q3 ^ $q5) & self::U32_MAX;
        $q[5] = ($q7 ^ $q2 ^ $q4) & self::U32_MAX;
        $q[4] = ($q6 ^ $q1 ^ $q3) & self::U32_MAX;
        $q[3] = ($q5 ^ $q0 ^ $q2) & self::U32_MAX;
        $q[2] = ($q4 ^ $q7 ^ $q1) & self::U32_MAX;
        $q[1] = ($q3 ^ $q6 ^ $q0) & self::U32_MAX;
        $q[0] = ($q2 ^ $q5 ^ $q7) & self::U32_MAX;
    }

    /**
     * @param int $x
     * @return int
     */
    public static function subWord($x)
    {
        $q = ParagonIE_Sodium_Core_AES_Block::fromArray(
            array($x, $x, $x, $x, $x, $x, $x, $x)
        );
        $q->orthogonalize();
        self::sbox($q);
        $q->orthogonalize();
        return $q[0] & self::U32_MAX;
    }

    /**
     * Calculate the key schedule from a given random key
     *
     * @param string $key
     * @return ParagonIE_Sodium_Core_AES_KeySchedule
     * @throws SodiumException
     */
    public static function keySchedule($key)
    {
        $key_len = self::strlen($key);
        switch ($key_len) {
            case 16:
                $num_rounds = 10;
                break;
            case 24:
                $num_rounds = 12;
                break;
            case 32:
                $num_rounds = 14;
                break;
            default:
                throw new SodiumException('Invalid key length: ' . $key_len);
        }
        $skey = array();
        $comp_skey = array();
        $nk = $key_len >> 2;
        $nkf = ($num_rounds + 1) << 2;
        $tmp = 0;

        for ($i = 0; $i < $nk; ++$i) {
            $tmp = self::load_4(self::substr($key, $i << 2, 4));
            $skey[($i << 1)] = $tmp;
            $skey[($i << 1) + 1] = $tmp;
        }

        for ($i = $nk, $j = 0, $k = 0; $i < $nkf; ++$i) {
            if ($j === 0) {
                $tmp = (($tmp & 0xff) << 24) | ($tmp >> 8);
                $tmp = (self::subWord($tmp) ^ self::$Rcon[$k]) & self::U32_MAX;
            } elseif ($nk > 6 && $j === 4) {
                $tmp = self::subWord($tmp);
            }
            $tmp ^= $skey[($i - $nk) << 1];
            $skey[($i << 1)] = $tmp & self::U32_MAX;
            $skey[($i << 1) + 1] = $tmp & self::U32_MAX;
            if (++$j === $nk) {
                /** @psalm-suppress LoopInvalidation */
                $j = 0;
                ++$k;
            }
        }
        for ($i = 0; $i < $nkf; $i += 4) {
            $q = ParagonIE_Sodium_Core_AES_Block::fromArray(
                array_slice($skey, $i << 1, 8)
            );
            $q->orthogonalize();
            // We have to overwrite $skey since we're not using C pointers like BearSSL did
            for ($j = 0; $j < 8; ++$j) {
                $skey[($i << 1) + $j] = $q[$j];
            }
        }
        for ($i = 0, $j = 0; $i < $nkf; ++$i, $j += 2) {
            $comp_skey[$i] = ($skey[$j] & 0x55555555)
                | ($skey[$j + 1] & 0xAAAAAAAA);
        }
        return new ParagonIE_Sodium_Core_AES_KeySchedule($comp_skey, $num_rounds);
    }

    /**
     * Mutates $q
     *
     * @param ParagonIE_Sodium_Core_AES_KeySchedule $skey
     * @param ParagonIE_Sodium_Core_AES_Block $q
     * @param int $offset
     * @return void
     */
    public static function addRoundKey(
        ParagonIE_Sodium_Core_AES_Block $q,
        ParagonIE_Sodium_Core_AES_KeySchedule $skey,
        $offset = 0
    ) {
        $block = $skey->getRoundKey($offset);
        for ($j = 0; $j < 8; ++$j) {
            $q[$j] = ($q[$j] ^ $block[$j]) & ParagonIE_Sodium_Core_Util::U32_MAX;
        }
    }

    /**
     * This mainly exists for testing, as we need the round key features for AEGIS.
     *
     * @param string $message
     * @param string $key
     * @return string
     * @throws SodiumException
     */
    public static function decryptBlockECB($message, $key)
    {
        if (self::strlen($message) !== 16) {
            throw new SodiumException('decryptBlockECB() expects a 16 byte message');
        }
        $skey = self::keySchedule($key)->expand();
        $q = ParagonIE_Sodium_Core_AES_Block::init();
        $q[0] = self::load_4(self::substr($message, 0, 4));
        $q[2] = self::load_4(self::substr($message, 4, 4));
        $q[4] = self::load_4(self::substr($message, 8, 4));
        $q[6] = self::load_4(self::substr($message, 12, 4));

        $q->orthogonalize();
        self::bitsliceDecryptBlock($skey, $q);
        $q->orthogonalize();

        return self::store32_le($q[0]) .
            self::store32_le($q[2]) .
            self::store32_le($q[4]) .
            self::store32_le($q[6]);
    }

    /**
     * This mainly exists for testing, as we need the round key features for AEGIS.
     *
     * @param string $message
     * @param string $key
     * @return string
     * @throws SodiumException
     */
    public static function encryptBlockECB($message, $key)
    {
        if (self::strlen($message) !== 16) {
            throw new SodiumException('encryptBlockECB() expects a 16 byte message');
        }
        $comp_skey = self::keySchedule($key);
        $skey = $comp_skey->expand();
        $q = ParagonIE_Sodium_Core_AES_Block::init();
        $q[0] = self::load_4(self::substr($message, 0, 4));
        $q[2] = self::load_4(self::substr($message, 4, 4));
        $q[4] = self::load_4(self::substr($message, 8, 4));
        $q[6] = self::load_4(self::substr($message, 12, 4));

        $q->orthogonalize();
        self::bitsliceEncryptBlock($skey, $q);
        $q->orthogonalize();

        return self::store32_le($q[0]) .
            self::store32_le($q[2]) .
            self::store32_le($q[4]) .
            self::store32_le($q[6]);
    }

    /**
     * Mutates $q
     *
     * @param ParagonIE_Sodium_Core_AES_Expanded $skey
     * @param ParagonIE_Sodium_Core_AES_Block $q
     * @return void
     */
    public static function bitsliceEncryptBlock(
        ParagonIE_Sodium_Core_AES_Expanded $skey,
        ParagonIE_Sodium_Core_AES_Block $q
    ) {
        self::addRoundKey($q, $skey);
        for ($u = 1; $u < $skey->getNumRounds(); ++$u) {
            self::sbox($q);
            $q->shiftRows();
            $q->mixColumns();
            self::addRoundKey($q, $skey, ($u << 3));
        }
        self::sbox($q);
        $q->shiftRows();
        self::addRoundKey($q, $skey, ($skey->getNumRounds() << 3));
    }

    /**
     * @param string $x
     * @param string $y
     * @return string
     */
    public static function aesRound($x, $y)
    {
        $q = ParagonIE_Sodium_Core_AES_Block::init();
        $q[0] = self::load_4(self::substr($x, 0, 4));
        $q[2] = self::load_4(self::substr($x, 4, 4));
        $q[4] = self::load_4(self::substr($x, 8, 4));
        $q[6] = self::load_4(self::substr($x, 12, 4));

        $rk = ParagonIE_Sodium_Core_AES_Block::init();
        $rk[0] = $rk[1] = self::load_4(self::substr($y, 0, 4));
        $rk[2] = $rk[3] = self::load_4(self::substr($y, 4, 4));
        $rk[4] = $rk[5] = self::load_4(self::substr($y, 8, 4));
        $rk[6] = $rk[7] = self::load_4(self::substr($y, 12, 4));

        $q->orthogonalize();
        self::sbox($q);
        $q->shiftRows();
        $q->mixColumns();
        $q->orthogonalize();
        // add round key without key schedule:
        for ($i = 0; $i < 8; ++$i) {
            $q[$i] ^= $rk[$i];
        }
        return self::store32_le($q[0]) .
            self::store32_le($q[2]) .
            self::store32_le($q[4]) .
            self::store32_le($q[6]);
    }

    /**
     * Process two AES blocks in one shot.
     *
     * @param string $b0  First AES block
     * @param string $rk0 First round key
     * @param string $b1  Second AES block
     * @param string $rk1 Second round key
     * @return string[]
     */
    public static function doubleRound($b0, $rk0, $b1, $rk1)
    {
        $q = ParagonIE_Sodium_Core_AES_Block::init();
        // First block
        $q[0] = self::load_4(self::substr($b0, 0, 4));
        $q[2] = self::load_4(self::substr($b0, 4, 4));
        $q[4] = self::load_4(self::substr($b0, 8, 4));
        $q[6] = self::load_4(self::substr($b0, 12, 4));
        // Second block
        $q[1] = self::load_4(self::substr($b1, 0, 4));
        $q[3] = self::load_4(self::substr($b1, 4, 4));
        $q[5] = self::load_4(self::substr($b1, 8, 4));
        $q[7] = self::load_4(self::substr($b1, 12, 4));;

        $rk = ParagonIE_Sodium_Core_AES_Block::init();
        // First round key
        $rk[0] = self::load_4(self::substr($rk0, 0, 4));
        $rk[2] = self::load_4(self::substr($rk0, 4, 4));
        $rk[4] = self::load_4(self::substr($rk0, 8, 4));
        $rk[6] = self::load_4(self::substr($rk0, 12, 4));
        // Second round key
        $rk[1] = self::load_4(self::substr($rk1, 0, 4));
        $rk[3] = self::load_4(self::substr($rk1, 4, 4));
        $rk[5] = self::load_4(self::substr($rk1, 8, 4));
        $rk[7] = self::load_4(self::substr($rk1, 12, 4));

        $q->orthogonalize();
        self::sbox($q);
        $q->shiftRows();
        $q->mixColumns();
        $q->orthogonalize();
        // add round key without key schedule:
        for ($i = 0; $i < 8; ++$i) {
            $q[$i] ^= $rk[$i];
        }
        return array(
            self::store32_le($q[0]) . self::store32_le($q[2]) . self::store32_le($q[4]) . self::store32_le($q[6]),
            self::store32_le($q[1]) . self::store32_le($q[3]) . self::store32_le($q[5]) . self::store32_le($q[7]),
        );
    }

    /**
     * @param ParagonIE_Sodium_Core_AES_Expanded $skey
     * @param ParagonIE_Sodium_Core_AES_Block $q
     * @return void
     */
    public static function bitsliceDecryptBlock(
        ParagonIE_Sodium_Core_AES_Expanded $skey,
        ParagonIE_Sodium_Core_AES_Block $q
    ) {
        self::addRoundKey($q, $skey, ($skey->getNumRounds() << 3));
        for ($u = $skey->getNumRounds() - 1; $u > 0; --$u) {
            $q->inverseShiftRows();
            self::invSbox($q);
            self::addRoundKey($q, $skey, ($u << 3));
            $q->inverseMixColumns();
        }
        $q->inverseShiftRows();
        self::invSbox($q);
        self::addRoundKey($q, $skey, ($u << 3));
    }
}
PK�����	�Zk &�p2��p2����Poly1305/State.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_Poly1305_State', false)) {
    return;
}

/**
 * Class ParagonIE_Sodium_Core_Poly1305_State
 */
class ParagonIE_Sodium_Core_Poly1305_State extends ParagonIE_Sodium_Core_Util
{
    /**
     * @var array<int, int>
     */
    protected $buffer = array();

    /**
     * @var bool
     */
    protected $final = false;

    /**
     * @var array<int, int>
     */
    public $h;

    /**
     * @var int
     */
    protected $leftover = 0;

    /**
     * @var int[]
     */
    public $r;

    /**
     * @var int[]
     */
    public $pad;

    /**
     * ParagonIE_Sodium_Core_Poly1305_State constructor.
     *
     * @internal You should not use this directly from another application
     *
     * @param string $key
     * @throws InvalidArgumentException
     * @throws TypeError
     */
    public function __construct($key = '')
    {
        if (self::strlen($key) < 32) {
            throw new InvalidArgumentException(
                'Poly1305 requires a 32-byte key'
            );
        }
        /* r &= 0xffffffc0ffffffc0ffffffc0fffffff */
        $this->r = array(
            (int) ((self::load_4(self::substr($key, 0, 4))) & 0x3ffffff),
            (int) ((self::load_4(self::substr($key, 3, 4)) >> 2) & 0x3ffff03),
            (int) ((self::load_4(self::substr($key, 6, 4)) >> 4) & 0x3ffc0ff),
            (int) ((self::load_4(self::substr($key, 9, 4)) >> 6) & 0x3f03fff),
            (int) ((self::load_4(self::substr($key, 12, 4)) >> 8) & 0x00fffff)
        );

        /* h = 0 */
        $this->h = array(0, 0, 0, 0, 0);

        /* save pad for later */
        $this->pad = array(
            self::load_4(self::substr($key, 16, 4)),
            self::load_4(self::substr($key, 20, 4)),
            self::load_4(self::substr($key, 24, 4)),
            self::load_4(self::substr($key, 28, 4)),
        );

        $this->leftover = 0;
        $this->final = false;
    }

    /**
     * Zero internal buffer upon destruction
     */
    public function __destruct()
    {
        $this->r[0] ^= $this->r[0];
        $this->r[1] ^= $this->r[1];
        $this->r[2] ^= $this->r[2];
        $this->r[3] ^= $this->r[3];
        $this->r[4] ^= $this->r[4];
        $this->h[0] ^= $this->h[0];
        $this->h[1] ^= $this->h[1];
        $this->h[2] ^= $this->h[2];
        $this->h[3] ^= $this->h[3];
        $this->h[4] ^= $this->h[4];
        $this->pad[0] ^= $this->pad[0];
        $this->pad[1] ^= $this->pad[1];
        $this->pad[2] ^= $this->pad[2];
        $this->pad[3] ^= $this->pad[3];
        $this->leftover = 0;
        $this->final = true;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $message
     * @return self
     * @throws SodiumException
     * @throws TypeError
     */
    public function update($message = '')
    {
        $bytes = self::strlen($message);
        if ($bytes < 1) {
            return $this;
        }

        /* handle leftover */
        if ($this->leftover) {
            $want = ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE - $this->leftover;
            if ($want > $bytes) {
                $want = $bytes;
            }
            for ($i = 0; $i < $want; ++$i) {
                $mi = self::chrToInt($message[$i]);
                $this->buffer[$this->leftover + $i] = $mi;
            }
            // We snip off the leftmost bytes.
            $message = self::substr($message, $want);
            $bytes = self::strlen($message);
            $this->leftover += $want;
            if ($this->leftover < ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE) {
                // We still don't have enough to run $this->blocks()
                return $this;
            }

            $this->blocks(
                self::intArrayToString($this->buffer),
                ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE
            );
            $this->leftover = 0;
        }

        /* process full blocks */
        if ($bytes >= ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE) {
            /** @var int $want */
            $want = $bytes & ~(ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE - 1);
            if ($want >= ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE) {
                $block = self::substr($message, 0, $want);
                if (self::strlen($block) >= ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE) {
                    $this->blocks($block, $want);
                    $message = self::substr($message, $want);
                    $bytes = self::strlen($message);
                }
            }
        }

        /* store leftover */
        if ($bytes) {
            for ($i = 0; $i < $bytes; ++$i) {
                $mi = self::chrToInt($message[$i]);
                $this->buffer[$this->leftover + $i] = $mi;
            }
            $this->leftover = (int) $this->leftover + $bytes;
        }
        return $this;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $message
     * @param int $bytes
     * @return self
     * @throws TypeError
     */
    public function blocks($message, $bytes)
    {
        if (self::strlen($message) < 16) {
            $message = str_pad($message, 16, "\x00", STR_PAD_RIGHT);
        }
        /** @var int $hibit */
        $hibit = $this->final ? 0 : 1 << 24; /* 1 << 128 */
        $r0 = (int) $this->r[0];
        $r1 = (int) $this->r[1];
        $r2 = (int) $this->r[2];
        $r3 = (int) $this->r[3];
        $r4 = (int) $this->r[4];

        $s1 = self::mul($r1, 5, 3);
        $s2 = self::mul($r2, 5, 3);
        $s3 = self::mul($r3, 5, 3);
        $s4 = self::mul($r4, 5, 3);

        $h0 = $this->h[0];
        $h1 = $this->h[1];
        $h2 = $this->h[2];
        $h3 = $this->h[3];
        $h4 = $this->h[4];

        while ($bytes >= ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE) {
            /* h += m[i] */
            $h0 +=  self::load_4(self::substr($message, 0, 4))       & 0x3ffffff;
            $h1 += (self::load_4(self::substr($message, 3, 4)) >> 2) & 0x3ffffff;
            $h2 += (self::load_4(self::substr($message, 6, 4)) >> 4) & 0x3ffffff;
            $h3 += (self::load_4(self::substr($message, 9, 4)) >> 6) & 0x3ffffff;
            $h4 += (self::load_4(self::substr($message, 12, 4)) >> 8) | $hibit;

            /* h *= r */
            $d0 = (
                self::mul($h0, $r0, 27) +
                self::mul($s4, $h1, 27) +
                self::mul($s3, $h2, 27) +
                self::mul($s2, $h3, 27) +
                self::mul($s1, $h4, 27)
            );

            $d1 = (
                self::mul($h0, $r1, 27) +
                self::mul($h1, $r0, 27) +
                self::mul($s4, $h2, 27) +
                self::mul($s3, $h3, 27) +
                self::mul($s2, $h4, 27)
            );

            $d2 = (
                self::mul($h0, $r2, 27) +
                self::mul($h1, $r1, 27) +
                self::mul($h2, $r0, 27) +
                self::mul($s4, $h3, 27) +
                self::mul($s3, $h4, 27)
            );

            $d3 = (
                self::mul($h0, $r3, 27) +
                self::mul($h1, $r2, 27) +
                self::mul($h2, $r1, 27) +
                self::mul($h3, $r0, 27) +
                self::mul($s4, $h4, 27)
            );

            $d4 = (
                self::mul($h0, $r4, 27) +
                self::mul($h1, $r3, 27) +
                self::mul($h2, $r2, 27) +
                self::mul($h3, $r1, 27) +
                self::mul($h4, $r0, 27)
            );

            /* (partial) h %= p */
            /** @var int $c */
            $c = $d0 >> 26;
            /** @var int $h0 */
            $h0 = $d0 & 0x3ffffff;
            $d1 += $c;

            /** @var int $c */
            $c = $d1 >> 26;
            /** @var int $h1 */
            $h1 = $d1 & 0x3ffffff;
            $d2 += $c;

            /** @var int $c */
            $c = $d2 >> 26;
            /** @var int $h2  */
            $h2 = $d2 & 0x3ffffff;
            $d3 += $c;

            /** @var int $c */
            $c = $d3 >> 26;
            /** @var int $h3 */
            $h3 = $d3 & 0x3ffffff;
            $d4 += $c;

            /** @var int $c */
            $c = $d4 >> 26;
            /** @var int $h4 */
            $h4 = $d4 & 0x3ffffff;
            $h0 += (int) self::mul($c, 5, 3);

            /** @var int $c */
            $c = $h0 >> 26;
            /** @var int $h0 */
            $h0 &= 0x3ffffff;
            $h1 += $c;

            // Chop off the left 32 bytes.
            $message = self::substr(
                $message,
                ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE
            );
            $bytes -= ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE;
        }

        $this->h = array(
            (int) ($h0 & 0xffffffff),
            (int) ($h1 & 0xffffffff),
            (int) ($h2 & 0xffffffff),
            (int) ($h3 & 0xffffffff),
            (int) ($h4 & 0xffffffff)
        );
        return $this;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @return string
     * @throws TypeError
     */
    public function finish()
    {
        /* process the remaining block */
        if ($this->leftover) {
            $i = $this->leftover;
            $this->buffer[$i++] = 1;
            for (; $i < ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE; ++$i) {
                $this->buffer[$i] = 0;
            }
            $this->final = true;
            $this->blocks(
                self::substr(
                    self::intArrayToString($this->buffer),
                    0,
                    ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE
                ),
                ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE
            );
        }

        $h0 = (int) $this->h[0];
        $h1 = (int) $this->h[1];
        $h2 = (int) $this->h[2];
        $h3 = (int) $this->h[3];
        $h4 = (int) $this->h[4];

        /** @var int $c */
        $c = $h1 >> 26;
        /** @var int $h1 */
        $h1 &= 0x3ffffff;
        /** @var int $h2 */
        $h2 += $c;
        /** @var int $c */
        $c = $h2 >> 26;
        /** @var int $h2 */
        $h2 &= 0x3ffffff;
        $h3 += $c;
        /** @var int $c */
        $c = $h3 >> 26;
        $h3 &= 0x3ffffff;
        $h4 += $c;
        /** @var int $c */
        $c = $h4 >> 26;
        $h4 &= 0x3ffffff;
        /** @var int $h0 */
        $h0 += self::mul($c, 5, 3);
        /** @var int $c */
        $c = $h0 >> 26;
        /** @var int $h0 */
        $h0 &= 0x3ffffff;
        /** @var int $h1 */
        $h1 += $c;

        /* compute h + -p */
        /** @var int $g0 */
        $g0 = $h0 + 5;
        /** @var int $c */
        $c = $g0 >> 26;
        /** @var int $g0 */
        $g0 &= 0x3ffffff;

        /** @var int $g1 */
        $g1 = $h1 + $c;
        /** @var int $c */
        $c = $g1 >> 26;
        $g1 &= 0x3ffffff;

        /** @var int $g2 */
        $g2 = $h2 + $c;
        /** @var int $c */
        $c = $g2 >> 26;
        /** @var int $g2 */
        $g2 &= 0x3ffffff;

        /** @var int $g3 */
        $g3 = $h3 + $c;
        /** @var int $c */
        $c = $g3 >> 26;
        /** @var int $g3 */
        $g3 &= 0x3ffffff;

        /** @var int $g4 */
        $g4 = ($h4 + $c - (1 << 26)) & 0xffffffff;

        /* select h if h < p, or h + -p if h >= p */
        /** @var int $mask */
        $mask = ($g4 >> 31) - 1;

        $g0 &= $mask;
        $g1 &= $mask;
        $g2 &= $mask;
        $g3 &= $mask;
        $g4 &= $mask;

        /** @var int $mask */
        $mask = ~$mask & 0xffffffff;
        /** @var int $h0 */
        $h0 = ($h0 & $mask) | $g0;
        /** @var int $h1 */
        $h1 = ($h1 & $mask) | $g1;
        /** @var int $h2 */
        $h2 = ($h2 & $mask) | $g2;
        /** @var int $h3 */
        $h3 = ($h3 & $mask) | $g3;
        /** @var int $h4 */
        $h4 = ($h4 & $mask) | $g4;

        /* h = h % (2^128) */
        /** @var int $h0 */
        $h0 = (($h0) | ($h1 << 26)) & 0xffffffff;
        /** @var int $h1 */
        $h1 = (($h1 >>  6) | ($h2 << 20)) & 0xffffffff;
        /** @var int $h2 */
        $h2 = (($h2 >> 12) | ($h3 << 14)) & 0xffffffff;
        /** @var int $h3 */
        $h3 = (($h3 >> 18) | ($h4 <<  8)) & 0xffffffff;

        /* mac = (h + pad) % (2^128) */
        $f = (int) ($h0 + $this->pad[0]);
        $h0 = (int) $f;
        $f = (int) ($h1 + $this->pad[1] + ($f >> 32));
        $h1 = (int) $f;
        $f = (int) ($h2 + $this->pad[2] + ($f >> 32));
        $h2 = (int) $f;
        $f = (int) ($h3 + $this->pad[3] + ($f >> 32));
        $h3 = (int) $f;

        return self::store32_le($h0 & 0xffffffff) .
            self::store32_le($h1 & 0xffffffff) .
            self::store32_le($h2 & 0xffffffff) .
            self::store32_le($h3 & 0xffffffff);
    }
}
PK�����	�Z�"(��(����SecretStream/State.phpnu��[�����������<?php

/**
 * Class ParagonIE_Sodium_Core_SecretStream_State
 */
class ParagonIE_Sodium_Core_SecretStream_State
{
    /** @var string $key */
    protected $key;

    /** @var int $counter */
    protected $counter;

    /** @var string $nonce */
    protected $nonce;

    /** @var string $_pad */
    protected $_pad;

    /**
     * ParagonIE_Sodium_Core_SecretStream_State constructor.
     * @param string $key
     * @param string|null $nonce
     */
    public function __construct($key, $nonce = null)
    {
        $this->key = $key;
        $this->counter = 1;
        if (is_null($nonce)) {
            $nonce = str_repeat("\0", 12);
        }
        $this->nonce = str_pad($nonce, 12, "\0", STR_PAD_RIGHT);;
        $this->_pad = str_repeat("\0", 4);
    }

    /**
     * @return self
     */
    public function counterReset()
    {
        $this->counter = 1;
        $this->_pad = str_repeat("\0", 4);
        return $this;
    }

    /**
     * @return string
     */
    public function getKey()
    {
        return $this->key;
    }

    /**
     * @return string
     */
    public function getCounter()
    {
        return ParagonIE_Sodium_Core_Util::store32_le($this->counter);
    }

    /**
     * @return string
     */
    public function getNonce()
    {
        if (!is_string($this->nonce)) {
            $this->nonce = str_repeat("\0", 12);
        }
        if (ParagonIE_Sodium_Core_Util::strlen($this->nonce) !== 12) {
            $this->nonce = str_pad($this->nonce, 12, "\0", STR_PAD_RIGHT);
        }
        return $this->nonce;
    }

    /**
     * @return string
     */
    public function getCombinedNonce()
    {
        return $this->getCounter() .
            ParagonIE_Sodium_Core_Util::substr($this->getNonce(), 0, 8);
    }

    /**
     * @return self
     */
    public function incrementCounter()
    {
        ++$this->counter;
        return $this;
    }

    /**
     * @return bool
     */
    public function needsRekey()
    {
        return ($this->counter & 0xffff) === 0;
    }

    /**
     * @param string $newKeyAndNonce
     * @return self
     */
    public function rekey($newKeyAndNonce)
    {
        $this->key = ParagonIE_Sodium_Core_Util::substr($newKeyAndNonce, 0, 32);
        $this->nonce = str_pad(
            ParagonIE_Sodium_Core_Util::substr($newKeyAndNonce, 32),
            12,
            "\0",
            STR_PAD_RIGHT
        );
        return $this;
    }

    /**
     * @param string $str
     * @return self
     */
    public function xorNonce($str)
    {
        $this->nonce = ParagonIE_Sodium_Core_Util::xorStrings(
            $this->getNonce(),
            str_pad(
                ParagonIE_Sodium_Core_Util::substr($str, 0, 8),
                12,
                "\0",
                STR_PAD_RIGHT
            )
        );
        return $this;
    }

    /**
     * @param string $string
     * @return self
     */
    public static function fromString($string)
    {
        $state = new ParagonIE_Sodium_Core_SecretStream_State(
            ParagonIE_Sodium_Core_Util::substr($string, 0, 32)
        );
        $state->counter = ParagonIE_Sodium_Core_Util::load_4(
            ParagonIE_Sodium_Core_Util::substr($string, 32, 4)
        );
        $state->nonce = ParagonIE_Sodium_Core_Util::substr($string, 36, 12);
        $state->_pad = ParagonIE_Sodium_Core_Util::substr($string, 48, 8);
        return $state;
    }

    /**
     * @return string
     */
    public function toString()
    {
        return $this->key .
            $this->getCounter() .
            $this->nonce .
            $this->_pad;
    }
}
PK�����	�Z�{�[��[����XSalsa20.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_XSalsa20', false)) {
    return;
}

/**
 * Class ParagonIE_Sodium_Core_XSalsa20
 */
abstract class ParagonIE_Sodium_Core_XSalsa20 extends ParagonIE_Sodium_Core_HSalsa20
{
    /**
     * Expand a key and nonce into an xsalsa20 keystream.
     *
     * @internal You should not use this directly from another application
     *
     * @param int $len
     * @param string $nonce
     * @param string $key
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function xsalsa20($len, $nonce, $key)
    {
        $ret = self::salsa20(
            $len,
            self::substr($nonce, 16, 8),
            self::hsalsa20($nonce, $key)
        );
        return $ret;
    }

    /**
     * Encrypt a string with XSalsa20. Doesn't provide integrity.
     *
     * @internal You should not use this directly from another application
     *
     * @param string $message
     * @param string $nonce
     * @param string $key
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function xsalsa20_xor($message, $nonce, $key)
    {
        return self::xorStrings(
            $message,
            self::xsalsa20(
                self::strlen($message),
                $nonce,
                $key
            )
        );
    }
}
PK�����	�Z��&-�&-���Curve25519.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_Curve25519', false)) {
    return;
}

/**
 * Class ParagonIE_Sodium_Core_Curve25519
 *
 * Implements Curve25519 core functions
 *
 * Based on the ref10 curve25519 code provided by libsodium
 *
 * @ref https://github.com/jedisct1/libsodium/blob/master/src/libsodium/crypto_core/curve25519/ref10/curve25519_ref10.c
 */
abstract class ParagonIE_Sodium_Core_Curve25519 extends ParagonIE_Sodium_Core_Curve25519_H
{
    /**
     * Get a field element of size 10 with a value of 0
     *
     * @internal You should not use this directly from another application
     *
     * @return ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public static function fe_0()
    {
        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
            array(0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
        );
    }

    /**
     * Get a field element of size 10 with a value of 1
     *
     * @internal You should not use this directly from another application
     *
     * @return ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public static function fe_1()
    {
        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
            array(1, 0, 0, 0, 0, 0, 0, 0, 0, 0)
        );
    }

    /**
     * Add two field elements.
     *
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $g
     * @return ParagonIE_Sodium_Core_Curve25519_Fe
     * @psalm-suppress MixedAssignment
     * @psalm-suppress MixedOperand
     */
    public static function fe_add(
        ParagonIE_Sodium_Core_Curve25519_Fe $f,
        ParagonIE_Sodium_Core_Curve25519_Fe $g
    ) {
        /** @var array<int, int> $arr */
        $arr = array();
        for ($i = 0; $i < 10; ++$i) {
            $arr[$i] = (int) ($f[$i] + $g[$i]);
        }
        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($arr);
    }

    /**
     * Constant-time conditional move.
     *
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $g
     * @param int $b
     * @return ParagonIE_Sodium_Core_Curve25519_Fe
     * @psalm-suppress MixedAssignment
     */
    public static function fe_cmov(
        ParagonIE_Sodium_Core_Curve25519_Fe $f,
        ParagonIE_Sodium_Core_Curve25519_Fe $g,
        $b = 0
    ) {
        /** @var array<int, int> $h */
        $h = array();
        $b *= -1;
        for ($i = 0; $i < 10; ++$i) {
            $x = (($f[$i] ^ $g[$i]) & $b);
            $h[$i] = ($f[$i]) ^ $x;
        }
        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($h);
    }

    /**
     * Create a copy of a field element.
     *
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
     * @return ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public static function fe_copy(ParagonIE_Sodium_Core_Curve25519_Fe $f)
    {
        $h = clone $f;
        return $h;
    }

    /**
     * Give: 32-byte string.
     * Receive: A field element object to use for internal calculations.
     *
     * @internal You should not use this directly from another application
     *
     * @param string $s
     * @return ParagonIE_Sodium_Core_Curve25519_Fe
     * @throws RangeException
     * @throws TypeError
     */
    public static function fe_frombytes($s)
    {
        if (self::strlen($s) !== 32) {
            throw new RangeException('Expected a 32-byte string.');
        }
        $h0 = self::load_4($s);
        $h1 = self::load_3(self::substr($s, 4, 3)) << 6;
        $h2 = self::load_3(self::substr($s, 7, 3)) << 5;
        $h3 = self::load_3(self::substr($s, 10, 3)) << 3;
        $h4 = self::load_3(self::substr($s, 13, 3)) << 2;
        $h5 = self::load_4(self::substr($s, 16, 4));
        $h6 = self::load_3(self::substr($s, 20, 3)) << 7;
        $h7 = self::load_3(self::substr($s, 23, 3)) << 5;
        $h8 = self::load_3(self::substr($s, 26, 3)) << 4;
        $h9 = (self::load_3(self::substr($s, 29, 3)) & 8388607) << 2;

        $carry9 = ($h9 + (1 << 24)) >> 25;
        $h0 += self::mul($carry9, 19, 5);
        $h9 -= $carry9 << 25;
        $carry1 = ($h1 + (1 << 24)) >> 25;
        $h2 += $carry1;
        $h1 -= $carry1 << 25;
        $carry3 = ($h3 + (1 << 24)) >> 25;
        $h4 += $carry3;
        $h3 -= $carry3 << 25;
        $carry5 = ($h5 + (1 << 24)) >> 25;
        $h6 += $carry5;
        $h5 -= $carry5 << 25;
        $carry7 = ($h7 + (1 << 24)) >> 25;
        $h8 += $carry7;
        $h7 -= $carry7 << 25;

        $carry0 = ($h0 + (1 << 25)) >> 26;
        $h1 += $carry0;
        $h0 -= $carry0 << 26;
        $carry2 = ($h2 + (1 << 25)) >> 26;
        $h3 += $carry2;
        $h2 -= $carry2 << 26;
        $carry4 = ($h4 + (1 << 25)) >> 26;
        $h5 += $carry4;
        $h4 -= $carry4 << 26;
        $carry6 = ($h6 + (1 << 25)) >> 26;
        $h7 += $carry6;
        $h6 -= $carry6 << 26;
        $carry8 = ($h8 + (1 << 25)) >> 26;
        $h9 += $carry8;
        $h8 -= $carry8 << 26;

        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
            array(
                (int) $h0,
                (int) $h1,
                (int) $h2,
                (int) $h3,
                (int) $h4,
                (int) $h5,
                (int) $h6,
                (int) $h7,
                (int) $h8,
                (int) $h9
            )
        );
    }

    /**
     * Convert a field element to a byte string.
     *
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $h
     * @return string
     */
    public static function fe_tobytes(ParagonIE_Sodium_Core_Curve25519_Fe $h)
    {
        $h0 = (int) $h[0];
        $h1 = (int) $h[1];
        $h2 = (int) $h[2];
        $h3 = (int) $h[3];
        $h4 = (int) $h[4];
        $h5 = (int) $h[5];
        $h6 = (int) $h[6];
        $h7 = (int) $h[7];
        $h8 = (int) $h[8];
        $h9 = (int) $h[9];

        $q = (self::mul($h9, 19, 5) + (1 << 24)) >> 25;
        $q = ($h0 + $q) >> 26;
        $q = ($h1 + $q) >> 25;
        $q = ($h2 + $q) >> 26;
        $q = ($h3 + $q) >> 25;
        $q = ($h4 + $q) >> 26;
        $q = ($h5 + $q) >> 25;
        $q = ($h6 + $q) >> 26;
        $q = ($h7 + $q) >> 25;
        $q = ($h8 + $q) >> 26;
        $q = ($h9 + $q) >> 25;

        $h0 += self::mul($q, 19, 5);

        $carry0 = $h0 >> 26;
        $h1 += $carry0;
        $h0 -= $carry0 << 26;
        $carry1 = $h1 >> 25;
        $h2 += $carry1;
        $h1 -= $carry1 << 25;
        $carry2 = $h2 >> 26;
        $h3 += $carry2;
        $h2 -= $carry2 << 26;
        $carry3 = $h3 >> 25;
        $h4 += $carry3;
        $h3 -= $carry3 << 25;
        $carry4 = $h4 >> 26;
        $h5 += $carry4;
        $h4 -= $carry4 << 26;
        $carry5 = $h5 >> 25;
        $h6 += $carry5;
        $h5 -= $carry5 << 25;
        $carry6 = $h6 >> 26;
        $h7 += $carry6;
        $h6 -= $carry6 << 26;
        $carry7 = $h7 >> 25;
        $h8 += $carry7;
        $h7 -= $carry7 << 25;
        $carry8 = $h8 >> 26;
        $h9 += $carry8;
        $h8 -= $carry8 << 26;
        $carry9 = $h9 >> 25;
        $h9 -= $carry9 << 25;

        /**
         * @var array<int, int>
         */
        $s = array(
            (int) (($h0 >> 0) & 0xff),
            (int) (($h0 >> 8) & 0xff),
            (int) (($h0 >> 16) & 0xff),
            (int) ((($h0 >> 24) | ($h1 << 2)) & 0xff),
            (int) (($h1 >> 6) & 0xff),
            (int) (($h1 >> 14) & 0xff),
            (int) ((($h1 >> 22) | ($h2 << 3)) & 0xff),
            (int) (($h2 >> 5) & 0xff),
            (int) (($h2 >> 13) & 0xff),
            (int) ((($h2 >> 21) | ($h3 << 5)) & 0xff),
            (int) (($h3 >> 3) & 0xff),
            (int) (($h3 >> 11) & 0xff),
            (int) ((($h3 >> 19) | ($h4 << 6)) & 0xff),
            (int) (($h4 >> 2) & 0xff),
            (int) (($h4 >> 10) & 0xff),
            (int) (($h4 >> 18) & 0xff),
            (int) (($h5 >> 0) & 0xff),
            (int) (($h5 >> 8) & 0xff),
            (int) (($h5 >> 16) & 0xff),
            (int) ((($h5 >> 24) | ($h6 << 1)) & 0xff),
            (int) (($h6 >> 7) & 0xff),
            (int) (($h6 >> 15) & 0xff),
            (int) ((($h6 >> 23) | ($h7 << 3)) & 0xff),
            (int) (($h7 >> 5) & 0xff),
            (int) (($h7 >> 13) & 0xff),
            (int) ((($h7 >> 21) | ($h8 << 4)) & 0xff),
            (int) (($h8 >> 4) & 0xff),
            (int) (($h8 >> 12) & 0xff),
            (int) ((($h8 >> 20) | ($h9 << 6)) & 0xff),
            (int) (($h9 >> 2) & 0xff),
            (int) (($h9 >> 10) & 0xff),
            (int) (($h9 >> 18) & 0xff)
        );
        return self::intArrayToString($s);
    }

    /**
     * Is a field element negative? (1 = yes, 0 = no. Used in calculations.)
     *
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
     * @return int
     * @throws SodiumException
     * @throws TypeError
     */
    public static function fe_isnegative(ParagonIE_Sodium_Core_Curve25519_Fe $f)
    {
        $str = self::fe_tobytes($f);
        return (int) (self::chrToInt($str[0]) & 1);
    }

    /**
     * Returns 0 if this field element results in all NUL bytes.
     *
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     */
    public static function fe_isnonzero(ParagonIE_Sodium_Core_Curve25519_Fe $f)
    {
        static $zero;
        if ($zero === null) {
            $zero = str_repeat("\x00", 32);
        }
        /** @var string $zero */
        /** @var string $str */
        $str = self::fe_tobytes($f);
        return !self::verify_32($str, (string) $zero);
    }

    /**
     * Multiply two field elements
     *
     * h = f * g
     *
     * @internal You should not use this directly from another application
     *
     * @security Is multiplication a source of timing leaks? If so, can we do
     *           anything to prevent that from happening?
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $g
     * @return ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public static function fe_mul(
        ParagonIE_Sodium_Core_Curve25519_Fe $f,
        ParagonIE_Sodium_Core_Curve25519_Fe $g
    ) {
        // Ensure limbs aren't oversized.
        $f = self::fe_normalize($f);
        $g = self::fe_normalize($g);
        $f0 = $f[0];
        $f1 = $f[1];
        $f2 = $f[2];
        $f3 = $f[3];
        $f4 = $f[4];
        $f5 = $f[5];
        $f6 = $f[6];
        $f7 = $f[7];
        $f8 = $f[8];
        $f9 = $f[9];
        $g0 = $g[0];
        $g1 = $g[1];
        $g2 = $g[2];
        $g3 = $g[3];
        $g4 = $g[4];
        $g5 = $g[5];
        $g6 = $g[6];
        $g7 = $g[7];
        $g8 = $g[8];
        $g9 = $g[9];
        $g1_19 = self::mul($g1, 19, 5);
        $g2_19 = self::mul($g2, 19, 5);
        $g3_19 = self::mul($g3, 19, 5);
        $g4_19 = self::mul($g4, 19, 5);
        $g5_19 = self::mul($g5, 19, 5);
        $g6_19 = self::mul($g6, 19, 5);
        $g7_19 = self::mul($g7, 19, 5);
        $g8_19 = self::mul($g8, 19, 5);
        $g9_19 = self::mul($g9, 19, 5);
        $f1_2 = $f1 << 1;
        $f3_2 = $f3 << 1;
        $f5_2 = $f5 << 1;
        $f7_2 = $f7 << 1;
        $f9_2 = $f9 << 1;
        $f0g0    = self::mul($f0,    $g0, 26);
        $f0g1    = self::mul($f0,    $g1, 25);
        $f0g2    = self::mul($f0,    $g2, 26);
        $f0g3    = self::mul($f0,    $g3, 25);
        $f0g4    = self::mul($f0,    $g4, 26);
        $f0g5    = self::mul($f0,    $g5, 25);
        $f0g6    = self::mul($f0,    $g6, 26);
        $f0g7    = self::mul($f0,    $g7, 25);
        $f0g8    = self::mul($f0,    $g8, 26);
        $f0g9    = self::mul($f0,    $g9, 26);
        $f1g0    = self::mul($f1,    $g0, 26);
        $f1g1_2  = self::mul($f1_2,  $g1, 25);
        $f1g2    = self::mul($f1,    $g2, 26);
        $f1g3_2  = self::mul($f1_2,  $g3, 25);
        $f1g4    = self::mul($f1,    $g4, 26);
        $f1g5_2  = self::mul($f1_2,  $g5, 25);
        $f1g6    = self::mul($f1,    $g6, 26);
        $f1g7_2  = self::mul($f1_2,  $g7, 25);
        $f1g8    = self::mul($f1,    $g8, 26);
        $f1g9_38 = self::mul($g9_19, $f1_2, 26);
        $f2g0    = self::mul($f2,    $g0, 26);
        $f2g1    = self::mul($f2,    $g1, 25);
        $f2g2    = self::mul($f2,    $g2, 26);
        $f2g3    = self::mul($f2,    $g3, 25);
        $f2g4    = self::mul($f2,    $g4, 26);
        $f2g5    = self::mul($f2,    $g5, 25);
        $f2g6    = self::mul($f2,    $g6, 26);
        $f2g7    = self::mul($f2,    $g7, 25);
        $f2g8_19 = self::mul($g8_19, $f2, 26);
        $f2g9_19 = self::mul($g9_19, $f2, 26);
        $f3g0    = self::mul($f3,    $g0, 26);
        $f3g1_2  = self::mul($f3_2,  $g1, 25);
        $f3g2    = self::mul($f3,    $g2, 26);
        $f3g3_2  = self::mul($f3_2,  $g3, 25);
        $f3g4    = self::mul($f3,    $g4, 26);
        $f3g5_2  = self::mul($f3_2,  $g5, 25);
        $f3g6    = self::mul($f3,    $g6, 26);
        $f3g7_38 = self::mul($g7_19, $f3_2, 26);
        $f3g8_19 = self::mul($g8_19, $f3, 25);
        $f3g9_38 = self::mul($g9_19, $f3_2, 26);
        $f4g0    = self::mul($f4,    $g0, 26);
        $f4g1    = self::mul($f4,    $g1, 25);
        $f4g2    = self::mul($f4,    $g2, 26);
        $f4g3    = self::mul($f4,    $g3, 25);
        $f4g4    = self::mul($f4,    $g4, 26);
        $f4g5    = self::mul($f4,    $g5, 25);
        $f4g6_19 = self::mul($g6_19, $f4, 26);
        $f4g7_19 = self::mul($g7_19, $f4, 26);
        $f4g8_19 = self::mul($g8_19, $f4, 26);
        $f4g9_19 = self::mul($g9_19, $f4, 26);
        $f5g0    = self::mul($f5,    $g0, 26);
        $f5g1_2  = self::mul($f5_2,  $g1, 25);
        $f5g2    = self::mul($f5,    $g2, 26);
        $f5g3_2  = self::mul($f5_2,  $g3, 25);
        $f5g4    = self::mul($f5,    $g4, 26);
        $f5g5_38 = self::mul($g5_19, $f5_2, 26);
        $f5g6_19 = self::mul($g6_19, $f5, 25);
        $f5g7_38 = self::mul($g7_19, $f5_2, 26);
        $f5g8_19 = self::mul($g8_19, $f5, 25);
        $f5g9_38 = self::mul($g9_19, $f5_2, 26);
        $f6g0    = self::mul($f6,    $g0, 26);
        $f6g1    = self::mul($f6,    $g1, 25);
        $f6g2    = self::mul($f6,    $g2, 26);
        $f6g3    = self::mul($f6,    $g3, 25);
        $f6g4_19 = self::mul($g4_19, $f6, 26);
        $f6g5_19 = self::mul($g5_19, $f6, 26);
        $f6g6_19 = self::mul($g6_19, $f6, 26);
        $f6g7_19 = self::mul($g7_19, $f6, 26);
        $f6g8_19 = self::mul($g8_19, $f6, 26);
        $f6g9_19 = self::mul($g9_19, $f6, 26);
        $f7g0    = self::mul($f7,    $g0, 26);
        $f7g1_2  = self::mul($f7_2,  $g1, 25);
        $f7g2    = self::mul($f7,    $g2, 26);
        $f7g3_38 = self::mul($g3_19, $f7_2, 26);
        $f7g4_19 = self::mul($g4_19, $f7, 26);
        $f7g5_38 = self::mul($g5_19, $f7_2, 26);
        $f7g6_19 = self::mul($g6_19, $f7, 25);
        $f7g7_38 = self::mul($g7_19, $f7_2, 26);
        $f7g8_19 = self::mul($g8_19, $f7, 25);
        $f7g9_38 = self::mul($g9_19,$f7_2, 26);
        $f8g0    = self::mul($f8,    $g0, 26);
        $f8g1    = self::mul($f8,    $g1, 25);
        $f8g2_19 = self::mul($g2_19, $f8, 26);
        $f8g3_19 = self::mul($g3_19, $f8, 26);
        $f8g4_19 = self::mul($g4_19, $f8, 26);
        $f8g5_19 = self::mul($g5_19, $f8, 26);
        $f8g6_19 = self::mul($g6_19, $f8, 26);
        $f8g7_19 = self::mul($g7_19, $f8, 26);
        $f8g8_19 = self::mul($g8_19, $f8, 26);
        $f8g9_19 = self::mul($g9_19, $f8, 26);
        $f9g0    = self::mul($f9,    $g0, 26);
        $f9g1_38 = self::mul($g1_19, $f9_2, 26);
        $f9g2_19 = self::mul($g2_19, $f9, 25);
        $f9g3_38 = self::mul($g3_19, $f9_2, 26);
        $f9g4_19 = self::mul($g4_19, $f9, 25);
        $f9g5_38 = self::mul($g5_19, $f9_2, 26);
        $f9g6_19 = self::mul($g6_19, $f9, 25);
        $f9g7_38 = self::mul($g7_19, $f9_2, 26);
        $f9g8_19 = self::mul($g8_19, $f9, 25);
        $f9g9_38 = self::mul($g9_19, $f9_2, 26);

        $h0 = $f0g0 + $f1g9_38 + $f2g8_19 + $f3g7_38 + $f4g6_19 + $f5g5_38 + $f6g4_19 + $f7g3_38 + $f8g2_19 + $f9g1_38;
        $h1 = $f0g1 + $f1g0    + $f2g9_19 + $f3g8_19 + $f4g7_19 + $f5g6_19 + $f6g5_19 + $f7g4_19 + $f8g3_19 + $f9g2_19;
        $h2 = $f0g2 + $f1g1_2  + $f2g0    + $f3g9_38 + $f4g8_19 + $f5g7_38 + $f6g6_19 + $f7g5_38 + $f8g4_19 + $f9g3_38;
        $h3 = $f0g3 + $f1g2    + $f2g1    + $f3g0    + $f4g9_19 + $f5g8_19 + $f6g7_19 + $f7g6_19 + $f8g5_19 + $f9g4_19;
        $h4 = $f0g4 + $f1g3_2  + $f2g2    + $f3g1_2  + $f4g0    + $f5g9_38 + $f6g8_19 + $f7g7_38 + $f8g6_19 + $f9g5_38;
        $h5 = $f0g5 + $f1g4    + $f2g3    + $f3g2    + $f4g1    + $f5g0    + $f6g9_19 + $f7g8_19 + $f8g7_19 + $f9g6_19;
        $h6 = $f0g6 + $f1g5_2  + $f2g4    + $f3g3_2  + $f4g2    + $f5g1_2  + $f6g0    + $f7g9_38 + $f8g8_19 + $f9g7_38;
        $h7 = $f0g7 + $f1g6    + $f2g5    + $f3g4    + $f4g3    + $f5g2    + $f6g1    + $f7g0    + $f8g9_19 + $f9g8_19;
        $h8 = $f0g8 + $f1g7_2  + $f2g6    + $f3g5_2  + $f4g4    + $f5g3_2  + $f6g2    + $f7g1_2  + $f8g0    + $f9g9_38;
        $h9 = $f0g9 + $f1g8    + $f2g7    + $f3g6    + $f4g5    + $f5g4    + $f6g3    + $f7g2    + $f8g1    + $f9g0   ;

        $carry0 = ($h0 + (1 << 25)) >> 26;
        $h1 += $carry0;
        $h0 -= $carry0 << 26;
        $carry4 = ($h4 + (1 << 25)) >> 26;
        $h5 += $carry4;
        $h4 -= $carry4 << 26;

        $carry1 = ($h1 + (1 << 24)) >> 25;
        $h2 += $carry1;
        $h1 -= $carry1 << 25;
        $carry5 = ($h5 + (1 << 24)) >> 25;
        $h6 += $carry5;
        $h5 -= $carry5 << 25;

        $carry2 = ($h2 + (1 << 25)) >> 26;
        $h3 += $carry2;
        $h2 -= $carry2 << 26;
        $carry6 = ($h6 + (1 << 25)) >> 26;
        $h7 += $carry6;
        $h6 -= $carry6 << 26;

        $carry3 = ($h3 + (1 << 24)) >> 25;
        $h4 += $carry3;
        $h3 -= $carry3 << 25;
        $carry7 = ($h7 + (1 << 24)) >> 25;
        $h8 += $carry7;
        $h7 -= $carry7 << 25;

        $carry4 = ($h4 + (1 << 25)) >> 26;
        $h5 += $carry4;
        $h4 -= $carry4 << 26;
        $carry8 = ($h8 + (1 << 25)) >> 26;
        $h9 += $carry8;
        $h8 -= $carry8 << 26;

        $carry9 = ($h9 + (1 << 24)) >> 25;
        $h0 += self::mul($carry9, 19, 5);
        $h9 -= $carry9 << 25;

        $carry0 = ($h0 + (1 << 25)) >> 26;
        $h1 += $carry0;
        $h0 -= $carry0 << 26;

        return self::fe_normalize(
            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
                array(
                    (int) $h0,
                    (int) $h1,
                    (int) $h2,
                    (int) $h3,
                    (int) $h4,
                    (int) $h5,
                    (int) $h6,
                    (int) $h7,
                    (int) $h8,
                    (int) $h9
                )
            )
        );
    }

    /**
     * Get the negative values for each piece of the field element.
     *
     * h = -f
     *
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
     * @return ParagonIE_Sodium_Core_Curve25519_Fe
     * @psalm-suppress MixedAssignment
     */
    public static function fe_neg(ParagonIE_Sodium_Core_Curve25519_Fe $f)
    {
        $h = new ParagonIE_Sodium_Core_Curve25519_Fe();
        for ($i = 0; $i < 10; ++$i) {
            $h[$i] = -$f[$i];
        }
        return self::fe_normalize($h);
    }

    /**
     * Square a field element
     *
     * h = f * f
     *
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
     * @return ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public static function fe_sq(ParagonIE_Sodium_Core_Curve25519_Fe $f)
    {
        $f = self::fe_normalize($f);
        $f0 = (int) $f[0];
        $f1 = (int) $f[1];
        $f2 = (int) $f[2];
        $f3 = (int) $f[3];
        $f4 = (int) $f[4];
        $f5 = (int) $f[5];
        $f6 = (int) $f[6];
        $f7 = (int) $f[7];
        $f8 = (int) $f[8];
        $f9 = (int) $f[9];

        $f0_2 = $f0 << 1;
        $f1_2 = $f1 << 1;
        $f2_2 = $f2 << 1;
        $f3_2 = $f3 << 1;
        $f4_2 = $f4 << 1;
        $f5_2 = $f5 << 1;
        $f6_2 = $f6 << 1;
        $f7_2 = $f7 << 1;
        $f5_38 = self::mul($f5, 38, 6);
        $f6_19 = self::mul($f6, 19, 5);
        $f7_38 = self::mul($f7, 38, 6);
        $f8_19 = self::mul($f8, 19, 5);
        $f9_38 = self::mul($f9, 38, 6);
        $f0f0    = self::mul($f0,    $f0,    26);
        $f0f1_2  = self::mul($f0_2,  $f1,    26);
        $f0f2_2  = self::mul($f0_2,  $f2,    26);
        $f0f3_2  = self::mul($f0_2,  $f3,    26);
        $f0f4_2  = self::mul($f0_2,  $f4,    26);
        $f0f5_2  = self::mul($f0_2,  $f5,    26);
        $f0f6_2  = self::mul($f0_2,  $f6,    26);
        $f0f7_2  = self::mul($f0_2,  $f7,    26);
        $f0f8_2  = self::mul($f0_2,  $f8,    26);
        $f0f9_2  = self::mul($f0_2,  $f9,    26);
        $f1f1_2  = self::mul($f1_2,  $f1,    26);
        $f1f2_2  = self::mul($f1_2,  $f2,    26);
        $f1f3_4  = self::mul($f1_2,  $f3_2,  26);
        $f1f4_2  = self::mul($f1_2,  $f4,    26);
        $f1f5_4  = self::mul($f1_2,  $f5_2,  26);
        $f1f6_2  = self::mul($f1_2,  $f6,    26);
        $f1f7_4  = self::mul($f1_2,  $f7_2,  26);
        $f1f8_2  = self::mul($f1_2,  $f8,    26);
        $f1f9_76 = self::mul($f9_38, $f1_2,  27);
        $f2f2    = self::mul($f2,    $f2,    27);
        $f2f3_2  = self::mul($f2_2,  $f3,    27);
        $f2f4_2  = self::mul($f2_2,  $f4,    27);
        $f2f5_2  = self::mul($f2_2,  $f5,    27);
        $f2f6_2  = self::mul($f2_2,  $f6,    27);
        $f2f7_2  = self::mul($f2_2,  $f7,    27);
        $f2f8_38 = self::mul($f8_19, $f2_2,  27);
        $f2f9_38 = self::mul($f9_38, $f2,    26);
        $f3f3_2  = self::mul($f3_2,  $f3,    26);
        $f3f4_2  = self::mul($f3_2,  $f4,    26);
        $f3f5_4  = self::mul($f3_2,  $f5_2,  26);
        $f3f6_2  = self::mul($f3_2,  $f6,    26);
        $f3f7_76 = self::mul($f7_38, $f3_2,  26);
        $f3f8_38 = self::mul($f8_19, $f3_2,  26);
        $f3f9_76 = self::mul($f9_38, $f3_2,  26);
        $f4f4    = self::mul($f4,    $f4,    26);
        $f4f5_2  = self::mul($f4_2,  $f5,    26);
        $f4f6_38 = self::mul($f6_19, $f4_2,  27);
        $f4f7_38 = self::mul($f7_38, $f4,    26);
        $f4f8_38 = self::mul($f8_19, $f4_2,  27);
        $f4f9_38 = self::mul($f9_38, $f4,    26);
        $f5f5_38 = self::mul($f5_38, $f5,    26);
        $f5f6_38 = self::mul($f6_19, $f5_2,  26);
        $f5f7_76 = self::mul($f7_38, $f5_2,  26);
        $f5f8_38 = self::mul($f8_19, $f5_2,  26);
        $f5f9_76 = self::mul($f9_38, $f5_2,  26);
        $f6f6_19 = self::mul($f6_19, $f6,    26);
        $f6f7_38 = self::mul($f7_38, $f6,    26);
        $f6f8_38 = self::mul($f8_19, $f6_2,  27);
        $f6f9_38 = self::mul($f9_38, $f6,    26);
        $f7f7_38 = self::mul($f7_38, $f7,    26);
        $f7f8_38 = self::mul($f8_19, $f7_2,  26);
        $f7f9_76 = self::mul($f9_38, $f7_2,  26);
        $f8f8_19 = self::mul($f8_19, $f8,    26);
        $f8f9_38 = self::mul($f9_38, $f8,    26);
        $f9f9_38 = self::mul($f9_38, $f9,    26);
        $h0 = $f0f0   + $f1f9_76 + $f2f8_38 + $f3f7_76 + $f4f6_38 + $f5f5_38;
        $h1 = $f0f1_2 + $f2f9_38 + $f3f8_38 + $f4f7_38 + $f5f6_38;
        $h2 = $f0f2_2 + $f1f1_2  + $f3f9_76 + $f4f8_38 + $f5f7_76 + $f6f6_19;
        $h3 = $f0f3_2 + $f1f2_2  + $f4f9_38 + $f5f8_38 + $f6f7_38;
        $h4 = $f0f4_2 + $f1f3_4  + $f2f2    + $f5f9_76 + $f6f8_38 + $f7f7_38;
        $h5 = $f0f5_2 + $f1f4_2  + $f2f3_2  + $f6f9_38 + $f7f8_38;
        $h6 = $f0f6_2 + $f1f5_4  + $f2f4_2  + $f3f3_2  + $f7f9_76 + $f8f8_19;
        $h7 = $f0f7_2 + $f1f6_2  + $f2f5_2  + $f3f4_2  + $f8f9_38;
        $h8 = $f0f8_2 + $f1f7_4  + $f2f6_2  + $f3f5_4  + $f4f4    + $f9f9_38;
        $h9 = $f0f9_2 + $f1f8_2  + $f2f7_2  + $f3f6_2  + $f4f5_2;

        $carry0 = ($h0 + (1 << 25)) >> 26;
        $h1 += $carry0;
        $h0 -= $carry0 << 26;
        $carry4 = ($h4 + (1 << 25)) >> 26;
        $h5 += $carry4;
        $h4 -= $carry4 << 26;

        $carry1 = ($h1 + (1 << 24)) >> 25;
        $h2 += $carry1;
        $h1 -= $carry1 << 25;
        $carry5 = ($h5 + (1 << 24)) >> 25;
        $h6 += $carry5;
        $h5 -= $carry5 << 25;

        $carry2 = ($h2 + (1 << 25)) >> 26;
        $h3 += $carry2;
        $h2 -= $carry2 << 26;
        $carry6 = ($h6 + (1 << 25)) >> 26;
        $h7 += $carry6;
        $h6 -= $carry6 << 26;

        $carry3 = ($h3 + (1 << 24)) >> 25;
        $h4 += $carry3;
        $h3 -= $carry3 << 25;
        $carry7 = ($h7 + (1 << 24)) >> 25;
        $h8 += $carry7;
        $h7 -= $carry7 << 25;

        $carry4 = ($h4 + (1 << 25)) >> 26;
        $h5 += $carry4;
        $h4 -= $carry4 << 26;
        $carry8 = ($h8 + (1 << 25)) >> 26;
        $h9 += $carry8;
        $h8 -= $carry8 << 26;

        $carry9 = ($h9 + (1 << 24)) >> 25;
        $h0 += self::mul($carry9, 19, 5);
        $h9 -= $carry9 << 25;

        $carry0 = ($h0 + (1 << 25)) >> 26;
        $h1 += $carry0;
        $h0 -= $carry0 << 26;

        return self::fe_normalize(
            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
                array(
                    (int) $h0,
                    (int) $h1,
                    (int) $h2,
                    (int) $h3,
                    (int) $h4,
                    (int) $h5,
                    (int) $h6,
                    (int) $h7,
                    (int) $h8,
                    (int) $h9
                )
            )
        );
    }


    /**
     * Square and double a field element
     *
     * h = 2 * f * f
     *
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
     * @return ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public static function fe_sq2(ParagonIE_Sodium_Core_Curve25519_Fe $f)
    {
        $f = self::fe_normalize($f);
        $f0 = (int) $f[0];
        $f1 = (int) $f[1];
        $f2 = (int) $f[2];
        $f3 = (int) $f[3];
        $f4 = (int) $f[4];
        $f5 = (int) $f[5];
        $f6 = (int) $f[6];
        $f7 = (int) $f[7];
        $f8 = (int) $f[8];
        $f9 = (int) $f[9];

        $f0_2 = $f0 << 1;
        $f1_2 = $f1 << 1;
        $f2_2 = $f2 << 1;
        $f3_2 = $f3 << 1;
        $f4_2 = $f4 << 1;
        $f5_2 = $f5 << 1;
        $f6_2 = $f6 << 1;
        $f7_2 = $f7 << 1;
        $f5_38 = self::mul($f5, 38, 6); /* 1.959375*2^30 */
        $f6_19 = self::mul($f6, 19, 5); /* 1.959375*2^30 */
        $f7_38 = self::mul($f7, 38, 6); /* 1.959375*2^30 */
        $f8_19 = self::mul($f8, 19, 5); /* 1.959375*2^30 */
        $f9_38 = self::mul($f9, 38, 6); /* 1.959375*2^30 */
        $f0f0 = self::mul($f0, $f0, 24);
        $f0f1_2 = self::mul($f0_2, $f1, 24);
        $f0f2_2 = self::mul($f0_2, $f2, 24);
        $f0f3_2 = self::mul($f0_2, $f3, 24);
        $f0f4_2 = self::mul($f0_2, $f4, 24);
        $f0f5_2 = self::mul($f0_2, $f5, 24);
        $f0f6_2 = self::mul($f0_2, $f6, 24);
        $f0f7_2 = self::mul($f0_2, $f7, 24);
        $f0f8_2 = self::mul($f0_2, $f8, 24);
        $f0f9_2 = self::mul($f0_2, $f9, 24);
        $f1f1_2 = self::mul($f1_2,  $f1, 24);
        $f1f2_2 = self::mul($f1_2,  $f2, 24);
        $f1f3_4 = self::mul($f1_2,  $f3_2, 24);
        $f1f4_2 = self::mul($f1_2,  $f4, 24);
        $f1f5_4 = self::mul($f1_2,  $f5_2, 24);
        $f1f6_2 = self::mul($f1_2,  $f6, 24);
        $f1f7_4 = self::mul($f1_2,  $f7_2, 24);
        $f1f8_2 = self::mul($f1_2,  $f8, 24);
        $f1f9_76 = self::mul($f9_38, $f1_2, 24);
        $f2f2 = self::mul($f2,  $f2, 24);
        $f2f3_2 = self::mul($f2_2,  $f3, 24);
        $f2f4_2 = self::mul($f2_2,  $f4, 24);
        $f2f5_2 = self::mul($f2_2,  $f5, 24);
        $f2f6_2 = self::mul($f2_2,  $f6, 24);
        $f2f7_2 = self::mul($f2_2,  $f7, 24);
        $f2f8_38 = self::mul($f8_19, $f2_2, 25);
        $f2f9_38 = self::mul($f9_38, $f2, 24);
        $f3f3_2 = self::mul($f3_2,  $f3, 24);
        $f3f4_2 = self::mul($f3_2,  $f4, 24);
        $f3f5_4 = self::mul($f3_2,  $f5_2, 24);
        $f3f6_2 = self::mul($f3_2,  $f6, 24);
        $f3f7_76 = self::mul($f7_38, $f3_2, 24);
        $f3f8_38 = self::mul($f8_19, $f3_2, 24);
        $f3f9_76 = self::mul($f9_38, $f3_2, 24);
        $f4f4 = self::mul($f4,  $f4, 24);
        $f4f5_2 = self::mul($f4_2,  $f5, 24);
        $f4f6_38 = self::mul($f6_19, $f4_2, 25);
        $f4f7_38 = self::mul($f7_38, $f4, 24);
        $f4f8_38 = self::mul($f8_19, $f4_2, 25);
        $f4f9_38 = self::mul($f9_38, $f4, 24);
        $f5f5_38 = self::mul($f5_38, $f5, 24);
        $f5f6_38 = self::mul($f6_19, $f5_2, 24);
        $f5f7_76 = self::mul($f7_38, $f5_2, 24);
        $f5f8_38 = self::mul($f8_19, $f5_2, 24);
        $f5f9_76 = self::mul($f9_38, $f5_2, 24);
        $f6f6_19 = self::mul($f6_19, $f6, 24);
        $f6f7_38 = self::mul($f7_38, $f6, 24);
        $f6f8_38 = self::mul($f8_19, $f6_2, 25);
        $f6f9_38 = self::mul($f9_38, $f6, 24);
        $f7f7_38 = self::mul($f7_38, $f7, 24);
        $f7f8_38 = self::mul($f8_19, $f7_2, 24);
        $f7f9_76 = self::mul($f9_38, $f7_2, 24);
        $f8f8_19 = self::mul($f8_19, $f8, 24);
        $f8f9_38 = self::mul($f9_38, $f8, 24);
        $f9f9_38 = self::mul($f9_38, $f9, 24);

        $h0 = (int) ($f0f0 + $f1f9_76 + $f2f8_38 + $f3f7_76 + $f4f6_38 + $f5f5_38) << 1;
        $h1 = (int) ($f0f1_2 + $f2f9_38 + $f3f8_38 + $f4f7_38 + $f5f6_38) << 1;
        $h2 = (int) ($f0f2_2 + $f1f1_2  + $f3f9_76 + $f4f8_38 + $f5f7_76 + $f6f6_19) << 1;
        $h3 = (int) ($f0f3_2 + $f1f2_2  + $f4f9_38 + $f5f8_38 + $f6f7_38) << 1;
        $h4 = (int) ($f0f4_2 + $f1f3_4  + $f2f2    + $f5f9_76 + $f6f8_38 + $f7f7_38) << 1;
        $h5 = (int) ($f0f5_2 + $f1f4_2  + $f2f3_2  + $f6f9_38 + $f7f8_38) << 1;
        $h6 = (int) ($f0f6_2 + $f1f5_4  + $f2f4_2  + $f3f3_2  + $f7f9_76 + $f8f8_19) << 1;
        $h7 = (int) ($f0f7_2 + $f1f6_2  + $f2f5_2  + $f3f4_2  + $f8f9_38) << 1;
        $h8 = (int) ($f0f8_2 + $f1f7_4  + $f2f6_2  + $f3f5_4  + $f4f4    + $f9f9_38) << 1;
        $h9 = (int) ($f0f9_2 + $f1f8_2  + $f2f7_2  + $f3f6_2  + $f4f5_2) << 1;

        $carry0 = ($h0 + (1 << 25)) >> 26;
        $h1 += $carry0;
        $h0 -= $carry0 << 26;
        $carry4 = ($h4 + (1 << 25)) >> 26;
        $h5 += $carry4;
        $h4 -= $carry4 << 26;

        $carry1 = ($h1 + (1 << 24)) >> 25;
        $h2 += $carry1;
        $h1 -= $carry1 << 25;
        $carry5 = ($h5 + (1 << 24)) >> 25;
        $h6 += $carry5;
        $h5 -= $carry5 << 25;

        $carry2 = ($h2 + (1 << 25)) >> 26;
        $h3 += $carry2;
        $h2 -= $carry2 << 26;
        $carry6 = ($h6 + (1 << 25)) >> 26;
        $h7 += $carry6;
        $h6 -= $carry6 << 26;

        $carry3 = ($h3 + (1 << 24)) >> 25;
        $h4 += $carry3;
        $h3 -= $carry3 << 25;
        $carry7 = ($h7 + (1 << 24)) >> 25;
        $h8 += $carry7;
        $h7 -= $carry7 << 25;

        $carry4 = ($h4 + (1 << 25)) >> 26;
        $h5 += $carry4;
        $h4 -= $carry4 << 26;
        $carry8 = ($h8 + (1 << 25)) >> 26;
        $h9 += $carry8;
        $h8 -= $carry8 << 26;

        $carry9 = ($h9 + (1 << 24)) >> 25;
        $h0 += self::mul($carry9, 19, 5);
        $h9 -= $carry9 << 25;

        $carry0 = ($h0 + (1 << 25)) >> 26;
        $h1 += $carry0;
        $h0 -= $carry0 << 26;

        return self::fe_normalize(
            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
                array(
                    (int) $h0,
                    (int) $h1,
                    (int) $h2,
                    (int) $h3,
                    (int) $h4,
                    (int) $h5,
                    (int) $h6,
                    (int) $h7,
                    (int) $h8,
                    (int) $h9
                )
            )
        );
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $Z
     * @return ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public static function fe_invert(ParagonIE_Sodium_Core_Curve25519_Fe $Z)
    {
        $z = clone $Z;
        $t0 = self::fe_sq($z);
        $t1 = self::fe_sq($t0);
        $t1 = self::fe_sq($t1);
        $t1 = self::fe_mul($z, $t1);
        $t0 = self::fe_mul($t0, $t1);
        $t2 = self::fe_sq($t0);
        $t1 = self::fe_mul($t1, $t2);
        $t2 = self::fe_sq($t1);
        for ($i = 1; $i < 5; ++$i) {
            $t2 = self::fe_sq($t2);
        }
        $t1 = self::fe_mul($t2, $t1);
        $t2 = self::fe_sq($t1);
        for ($i = 1; $i < 10; ++$i) {
            $t2 = self::fe_sq($t2);
        }
        $t2 = self::fe_mul($t2, $t1);
        $t3 = self::fe_sq($t2);
        for ($i = 1; $i < 20; ++$i) {
            $t3 = self::fe_sq($t3);
        }
        $t2 = self::fe_mul($t3, $t2);
        $t2 = self::fe_sq($t2);
        for ($i = 1; $i < 10; ++$i) {
            $t2 = self::fe_sq($t2);
        }
        $t1 = self::fe_mul($t2, $t1);
        $t2 = self::fe_sq($t1);
        for ($i = 1; $i < 50; ++$i) {
            $t2 = self::fe_sq($t2);
        }
        $t2 = self::fe_mul($t2, $t1);
        $t3 = self::fe_sq($t2);
        for ($i = 1; $i < 100; ++$i) {
            $t3 = self::fe_sq($t3);
        }
        $t2 = self::fe_mul($t3, $t2);
        $t2 = self::fe_sq($t2);
        for ($i = 1; $i < 50; ++$i) {
            $t2 = self::fe_sq($t2);
        }
        $t1 = self::fe_mul($t2, $t1);
        $t1 = self::fe_sq($t1);
        for ($i = 1; $i < 5; ++$i) {
            $t1 = self::fe_sq($t1);
        }
        return self::fe_mul($t1, $t0);
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @ref https://github.com/jedisct1/libsodium/blob/68564326e1e9dc57ef03746f85734232d20ca6fb/src/libsodium/crypto_core/curve25519/ref10/curve25519_ref10.c#L1054-L1106
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $z
     * @return ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public static function fe_pow22523(ParagonIE_Sodium_Core_Curve25519_Fe $z)
    {
        $z = self::fe_normalize($z);
        # fe_sq(t0, z);
        # fe_sq(t1, t0);
        # fe_sq(t1, t1);
        # fe_mul(t1, z, t1);
        # fe_mul(t0, t0, t1);
        # fe_sq(t0, t0);
        # fe_mul(t0, t1, t0);
        # fe_sq(t1, t0);
        $t0 = self::fe_sq($z);
        $t1 = self::fe_sq($t0);
        $t1 = self::fe_sq($t1);
        $t1 = self::fe_mul($z, $t1);
        $t0 = self::fe_mul($t0, $t1);
        $t0 = self::fe_sq($t0);
        $t0 = self::fe_mul($t1, $t0);
        $t1 = self::fe_sq($t0);

        # for (i = 1; i < 5; ++i) {
        #     fe_sq(t1, t1);
        # }
        for ($i = 1; $i < 5; ++$i) {
            $t1 = self::fe_sq($t1);
        }

        # fe_mul(t0, t1, t0);
        # fe_sq(t1, t0);
        $t0 = self::fe_mul($t1, $t0);
        $t1 = self::fe_sq($t0);

        # for (i = 1; i < 10; ++i) {
        #     fe_sq(t1, t1);
        # }
        for ($i = 1; $i < 10; ++$i) {
            $t1 = self::fe_sq($t1);
        }

        # fe_mul(t1, t1, t0);
        # fe_sq(t2, t1);
        $t1 = self::fe_mul($t1, $t0);
        $t2 = self::fe_sq($t1);

        # for (i = 1; i < 20; ++i) {
        #     fe_sq(t2, t2);
        # }
        for ($i = 1; $i < 20; ++$i) {
            $t2 = self::fe_sq($t2);
        }

        # fe_mul(t1, t2, t1);
        # fe_sq(t1, t1);
        $t1 = self::fe_mul($t2, $t1);
        $t1 = self::fe_sq($t1);

        # for (i = 1; i < 10; ++i) {
        #     fe_sq(t1, t1);
        # }
        for ($i = 1; $i < 10; ++$i) {
            $t1 = self::fe_sq($t1);
        }

        # fe_mul(t0, t1, t0);
        # fe_sq(t1, t0);
        $t0 = self::fe_mul($t1, $t0);
        $t1 = self::fe_sq($t0);

        # for (i = 1; i < 50; ++i) {
        #     fe_sq(t1, t1);
        # }
        for ($i = 1; $i < 50; ++$i) {
            $t1 = self::fe_sq($t1);
        }

        # fe_mul(t1, t1, t0);
        # fe_sq(t2, t1);
        $t1 = self::fe_mul($t1, $t0);
        $t2 = self::fe_sq($t1);

        # for (i = 1; i < 100; ++i) {
        #     fe_sq(t2, t2);
        # }
        for ($i = 1; $i < 100; ++$i) {
            $t2 = self::fe_sq($t2);
        }

        # fe_mul(t1, t2, t1);
        # fe_sq(t1, t1);
        $t1 = self::fe_mul($t2, $t1);
        $t1 = self::fe_sq($t1);

        # for (i = 1; i < 50; ++i) {
        #     fe_sq(t1, t1);
        # }
        for ($i = 1; $i < 50; ++$i) {
            $t1 = self::fe_sq($t1);
        }

        # fe_mul(t0, t1, t0);
        # fe_sq(t0, t0);
        # fe_sq(t0, t0);
        # fe_mul(out, t0, z);
        $t0 = self::fe_mul($t1, $t0);
        $t0 = self::fe_sq($t0);
        $t0 = self::fe_sq($t0);
        return self::fe_mul($t0, $z);
    }

    /**
     * Subtract two field elements.
     *
     * h = f - g
     *
     * Preconditions:
     * |f| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
     * |g| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
     *
     * Postconditions:
     * |h| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
     *
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $g
     * @return ParagonIE_Sodium_Core_Curve25519_Fe
     * @psalm-suppress MixedOperand
     */
    public static function fe_sub(ParagonIE_Sodium_Core_Curve25519_Fe $f, ParagonIE_Sodium_Core_Curve25519_Fe $g)
    {
        return self::fe_normalize(
            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
                array(
                    (int) ($f[0] - $g[0]),
                    (int) ($f[1] - $g[1]),
                    (int) ($f[2] - $g[2]),
                    (int) ($f[3] - $g[3]),
                    (int) ($f[4] - $g[4]),
                    (int) ($f[5] - $g[5]),
                    (int) ($f[6] - $g[6]),
                    (int) ($f[7] - $g[7]),
                    (int) ($f[8] - $g[8]),
                    (int) ($f[9] - $g[9])
                )
            )
        );
    }

    /**
     * Add two group elements.
     *
     * r = p + q
     *
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_Cached $q
     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
     */
    public static function ge_add(
        ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p,
        ParagonIE_Sodium_Core_Curve25519_Ge_Cached $q
    ) {
        $r = new ParagonIE_Sodium_Core_Curve25519_Ge_P1p1();
        $r->X = self::fe_add($p->Y, $p->X);
        $r->Y = self::fe_sub($p->Y, $p->X);
        $r->Z = self::fe_mul($r->X, $q->YplusX);
        $r->Y = self::fe_mul($r->Y, $q->YminusX);
        $r->T = self::fe_mul($q->T2d, $p->T);
        $r->X = self::fe_mul($p->Z, $q->Z);
        $t0   = self::fe_add($r->X, $r->X);
        $r->X = self::fe_sub($r->Z, $r->Y);
        $r->Y = self::fe_add($r->Z, $r->Y);
        $r->Z = self::fe_add($t0, $r->T);
        $r->T = self::fe_sub($t0, $r->T);
        return $r;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @ref https://github.com/jedisct1/libsodium/blob/157c4a80c13b117608aeae12178b2d38825f9f8f/src/libsodium/crypto_core/curve25519/ref10/curve25519_ref10.c#L1185-L1215
     * @param string $a
     * @return array<int, mixed>
     * @throws SodiumException
     * @throws TypeError
     */
    public static function slide($a)
    {
        if (self::strlen($a) < 256) {
            if (self::strlen($a) < 16) {
                $a = str_pad($a, 256, '0', STR_PAD_RIGHT);
            }
        }
        /** @var array<int, int> $r */
        $r = array();

        /** @var int $i */
        for ($i = 0; $i < 256; ++$i) {
            $r[$i] = (int) (
                1 & (
                    self::chrToInt($a[(int) ($i >> 3)])
                        >>
                    ($i & 7)
                )
            );
        }

        for ($i = 0;$i < 256;++$i) {
            if ($r[$i]) {
                for ($b = 1;$b <= 6 && $i + $b < 256;++$b) {
                    if ($r[$i + $b]) {
                        if ($r[$i] + ($r[$i + $b] << $b) <= 15) {
                            $r[$i] += $r[$i + $b] << $b;
                            $r[$i + $b] = 0;
                        } elseif ($r[$i] - ($r[$i + $b] << $b) >= -15) {
                            $r[$i] -= $r[$i + $b] << $b;
                            for ($k = $i + $b; $k < 256; ++$k) {
                                if (!$r[$k]) {
                                    $r[$k] = 1;
                                    break;
                                }
                                $r[$k] = 0;
                            }
                        } else {
                            break;
                        }
                    }
                }
            }
        }
        return $r;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $s
     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P3
     * @throws SodiumException
     * @throws TypeError
     */
    public static function ge_frombytes_negate_vartime($s)
    {
        static $d = null;
        if (!$d) {
            $d = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$d);
        }

        # fe_frombytes(h->Y,s);
        # fe_1(h->Z);
        $h = new ParagonIE_Sodium_Core_Curve25519_Ge_P3(
            self::fe_0(),
            self::fe_frombytes($s),
            self::fe_1()
        );

        # fe_sq(u,h->Y);
        # fe_mul(v,u,d);
        # fe_sub(u,u,h->Z);       /* u = y^2-1 */
        # fe_add(v,v,h->Z);       /* v = dy^2+1 */
        $u = self::fe_sq($h->Y);
        /** @var ParagonIE_Sodium_Core_Curve25519_Fe $d */
        $v = self::fe_mul($u, $d);
        $u = self::fe_sub($u, $h->Z); /* u =  y^2 - 1 */
        $v = self::fe_add($v, $h->Z); /* v = dy^2 + 1 */

        # fe_sq(v3,v);
        # fe_mul(v3,v3,v);        /* v3 = v^3 */
        # fe_sq(h->X,v3);
        # fe_mul(h->X,h->X,v);
        # fe_mul(h->X,h->X,u);    /* x = uv^7 */
        $v3 = self::fe_sq($v);
        $v3 = self::fe_mul($v3, $v); /* v3 = v^3 */
        $h->X = self::fe_sq($v3);
        $h->X = self::fe_mul($h->X, $v);
        $h->X = self::fe_mul($h->X, $u); /* x = uv^7 */

        # fe_pow22523(h->X,h->X); /* x = (uv^7)^((q-5)/8) */
        # fe_mul(h->X,h->X,v3);
        # fe_mul(h->X,h->X,u);    /* x = uv^3(uv^7)^((q-5)/8) */
        $h->X = self::fe_pow22523($h->X); /* x = (uv^7)^((q-5)/8) */
        $h->X = self::fe_mul($h->X, $v3);
        $h->X = self::fe_mul($h->X, $u); /* x = uv^3(uv^7)^((q-5)/8) */

        # fe_sq(vxx,h->X);
        # fe_mul(vxx,vxx,v);
        # fe_sub(check,vxx,u);    /* vx^2-u */
        $vxx = self::fe_sq($h->X);
        $vxx = self::fe_mul($vxx, $v);
        $check = self::fe_sub($vxx, $u); /* vx^2 - u */

        # if (fe_isnonzero(check)) {
        #     fe_add(check,vxx,u);  /* vx^2+u */
        #     if (fe_isnonzero(check)) {
        #         return -1;
        #     }
        #     fe_mul(h->X,h->X,sqrtm1);
        # }
        if (self::fe_isnonzero($check)) {
            $check = self::fe_add($vxx, $u); /* vx^2 + u */
            if (self::fe_isnonzero($check)) {
                throw new RangeException('Internal check failed.');
            }
            $h->X = self::fe_mul(
                $h->X,
                ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$sqrtm1)
            );
        }

        # if (fe_isnegative(h->X) == (s[31] >> 7)) {
        #     fe_neg(h->X,h->X);
        # }
        $i = self::chrToInt($s[31]);
        if (self::fe_isnegative($h->X) === ($i >> 7)) {
            $h->X = self::fe_neg($h->X);
        }

        # fe_mul(h->T,h->X,h->Y);
        $h->T = self::fe_mul($h->X, $h->Y);
        return $h;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $R
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $q
     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
     */
    public static function ge_madd(
        ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $R,
        ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p,
        ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $q
    ) {
        $r = clone $R;
        $r->X = self::fe_add($p->Y, $p->X);
        $r->Y = self::fe_sub($p->Y, $p->X);
        $r->Z = self::fe_mul($r->X, $q->yplusx);
        $r->Y = self::fe_mul($r->Y, $q->yminusx);
        $r->T = self::fe_mul($q->xy2d, $p->T);
        $t0 = self::fe_add(clone $p->Z, clone $p->Z);
        $r->X = self::fe_sub($r->Z, $r->Y);
        $r->Y = self::fe_add($r->Z, $r->Y);
        $r->Z = self::fe_add($t0, $r->T);
        $r->T = self::fe_sub($t0, $r->T);

        return $r;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $R
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $q
     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
     */
    public static function ge_msub(
        ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $R,
        ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p,
        ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $q
    ) {
        $r = clone $R;

        $r->X = self::fe_add($p->Y, $p->X);
        $r->Y = self::fe_sub($p->Y, $p->X);
        $r->Z = self::fe_mul($r->X, $q->yminusx);
        $r->Y = self::fe_mul($r->Y, $q->yplusx);
        $r->T = self::fe_mul($q->xy2d, $p->T);
        $t0 = self::fe_add($p->Z, $p->Z);
        $r->X = self::fe_sub($r->Z, $r->Y);
        $r->Y = self::fe_add($r->Z, $r->Y);
        $r->Z = self::fe_sub($t0, $r->T);
        $r->T = self::fe_add($t0, $r->T);

        return $r;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $p
     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P2
     */
    public static function ge_p1p1_to_p2(ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $p)
    {
        $r = new ParagonIE_Sodium_Core_Curve25519_Ge_P2();
        $r->X = self::fe_mul($p->X, $p->T);
        $r->Y = self::fe_mul($p->Y, $p->Z);
        $r->Z = self::fe_mul($p->Z, $p->T);
        return $r;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $p
     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P3
     */
    public static function ge_p1p1_to_p3(ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $p)
    {
        $r = new ParagonIE_Sodium_Core_Curve25519_Ge_P3();
        $r->X = self::fe_mul($p->X, $p->T);
        $r->Y = self::fe_mul($p->Y, $p->Z);
        $r->Z = self::fe_mul($p->Z, $p->T);
        $r->T = self::fe_mul($p->X, $p->Y);
        return $r;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P2
     */
    public static function ge_p2_0()
    {
        return new ParagonIE_Sodium_Core_Curve25519_Ge_P2(
            self::fe_0(),
            self::fe_1(),
            self::fe_1()
        );
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P2 $p
     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
     */
    public static function ge_p2_dbl(ParagonIE_Sodium_Core_Curve25519_Ge_P2 $p)
    {
        $r = new ParagonIE_Sodium_Core_Curve25519_Ge_P1p1();

        $r->X = self::fe_sq($p->X);
        $r->Z = self::fe_sq($p->Y);
        $r->T = self::fe_sq2($p->Z);
        $r->Y = self::fe_add($p->X, $p->Y);
        $t0   = self::fe_sq($r->Y);
        $r->Y = self::fe_add($r->Z, $r->X);
        $r->Z = self::fe_sub($r->Z, $r->X);
        $r->X = self::fe_sub($t0, $r->Y);
        $r->T = self::fe_sub($r->T, $r->Z);

        return $r;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P3
     */
    public static function ge_p3_0()
    {
        return new ParagonIE_Sodium_Core_Curve25519_Ge_P3(
            self::fe_0(),
            self::fe_1(),
            self::fe_1(),
            self::fe_0()
        );
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
     * @return ParagonIE_Sodium_Core_Curve25519_Ge_Cached
     */
    public static function ge_p3_to_cached(ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p)
    {
        static $d2 = null;
        if ($d2 === null) {
            $d2 = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$d2);
        }
        /** @var ParagonIE_Sodium_Core_Curve25519_Fe $d2 */
        $r = new ParagonIE_Sodium_Core_Curve25519_Ge_Cached();
        $r->YplusX = self::fe_add($p->Y, $p->X);
        $r->YminusX = self::fe_sub($p->Y, $p->X);
        $r->Z = self::fe_copy($p->Z);
        $r->T2d = self::fe_mul($p->T, $d2);
        return $r;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P2
     */
    public static function ge_p3_to_p2(ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p)
    {
        return new ParagonIE_Sodium_Core_Curve25519_Ge_P2(
            self::fe_copy($p->X),
            self::fe_copy($p->Y),
            self::fe_copy($p->Z)
        );
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $h
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function ge_p3_tobytes(ParagonIE_Sodium_Core_Curve25519_Ge_P3 $h)
    {
        $recip = self::fe_invert($h->Z);
        $x = self::fe_mul($h->X, $recip);
        $y = self::fe_mul($h->Y, $recip);
        $s = self::fe_tobytes($y);
        $s[31] = self::intToChr(
            self::chrToInt($s[31]) ^ (self::fe_isnegative($x) << 7)
        );
        return $s;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
     */
    public static function ge_p3_dbl(ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p)
    {
        $q = self::ge_p3_to_p2($p);
        return self::ge_p2_dbl($q);
    }

    /**
     * @return ParagonIE_Sodium_Core_Curve25519_Ge_Precomp
     */
    public static function ge_precomp_0()
    {
        return new ParagonIE_Sodium_Core_Curve25519_Ge_Precomp(
            self::fe_1(),
            self::fe_1(),
            self::fe_0()
        );
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param int $b
     * @param int $c
     * @return int
     */
    public static function equal($b, $c)
    {
        return (int) ((($b ^ $c) - 1) >> 31) & 1;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param int|string $char
     * @return int (1 = yes, 0 = no)
     * @throws SodiumException
     * @throws TypeError
     */
    public static function negative($char)
    {
        if (is_int($char)) {
            return ($char >> 63) & 1;
        }
        $x = self::chrToInt(self::substr($char, 0, 1));
        return (int) ($x >> 63);
    }

    /**
     * Conditional move
     *
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $t
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $u
     * @param int $b
     * @return ParagonIE_Sodium_Core_Curve25519_Ge_Precomp
     */
    public static function cmov(
        ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $t,
        ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $u,
        $b
    ) {
        if (!is_int($b)) {
            throw new InvalidArgumentException('Expected an integer.');
        }
        return new ParagonIE_Sodium_Core_Curve25519_Ge_Precomp(
            self::fe_cmov($t->yplusx,  $u->yplusx,  $b),
            self::fe_cmov($t->yminusx, $u->yminusx, $b),
            self::fe_cmov($t->xy2d,    $u->xy2d,    $b)
        );
    }

    /**
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_Cached $t
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_Cached $u
     * @param int $b
     * @return ParagonIE_Sodium_Core_Curve25519_Ge_Cached
     */
    public static function ge_cmov_cached(
        ParagonIE_Sodium_Core_Curve25519_Ge_Cached $t,
        ParagonIE_Sodium_Core_Curve25519_Ge_Cached $u,
        $b
    ) {
        $b &= 1;
        $ret = new ParagonIE_Sodium_Core_Curve25519_Ge_Cached();
        $ret->YplusX  = self::fe_cmov($t->YplusX,  $u->YplusX,  $b);
        $ret->YminusX = self::fe_cmov($t->YminusX, $u->YminusX, $b);
        $ret->Z       = self::fe_cmov($t->Z,       $u->Z,       $b);
        $ret->T2d     = self::fe_cmov($t->T2d,     $u->T2d,     $b);
        return $ret;
    }

    /**
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_Cached[] $cached
     * @param int $b
     * @return ParagonIE_Sodium_Core_Curve25519_Ge_Cached
     * @throws SodiumException
     */
    public static function ge_cmov8_cached(array $cached, $b)
    {
        // const unsigned char bnegative = negative(b);
        // const unsigned char babs      = b - (((-bnegative) & b) * ((signed char) 1 << 1));
        $bnegative = self::negative($b);
        $babs = $b - (((-$bnegative) & $b) << 1);

        // ge25519_cached_0(t);
        $t = new ParagonIE_Sodium_Core_Curve25519_Ge_Cached(
            self::fe_1(),
            self::fe_1(),
            self::fe_1(),
            self::fe_0()
        );

        // ge25519_cmov_cached(t, &cached[0], equal(babs, 1));
        // ge25519_cmov_cached(t, &cached[1], equal(babs, 2));
        // ge25519_cmov_cached(t, &cached[2], equal(babs, 3));
        // ge25519_cmov_cached(t, &cached[3], equal(babs, 4));
        // ge25519_cmov_cached(t, &cached[4], equal(babs, 5));
        // ge25519_cmov_cached(t, &cached[5], equal(babs, 6));
        // ge25519_cmov_cached(t, &cached[6], equal(babs, 7));
        // ge25519_cmov_cached(t, &cached[7], equal(babs, 8));
        for ($x = 0; $x < 8; ++$x) {
            $t = self::ge_cmov_cached($t, $cached[$x], self::equal($babs, $x + 1));
        }

        // fe25519_copy(minust.YplusX, t->YminusX);
        // fe25519_copy(minust.YminusX, t->YplusX);
        // fe25519_copy(minust.Z, t->Z);
        // fe25519_neg(minust.T2d, t->T2d);
        $minust = new ParagonIE_Sodium_Core_Curve25519_Ge_Cached(
            self::fe_copy($t->YminusX),
            self::fe_copy($t->YplusX),
            self::fe_copy($t->Z),
            self::fe_neg($t->T2d)
        );
        return self::ge_cmov_cached($t, $minust, $bnegative);
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param int $pos
     * @param int $b
     * @return ParagonIE_Sodium_Core_Curve25519_Ge_Precomp
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     * @psalm-suppress MixedArrayAccess
     * @psalm-suppress MixedArrayOffset
     */
    public static function ge_select($pos = 0, $b = 0)
    {
        static $base = null;
        if ($base === null) {
            $base = array();
            /** @var int $i */
            foreach (self::$base as $i => $bas) {
                for ($j = 0; $j < 8; ++$j) {
                    $base[$i][$j] = new ParagonIE_Sodium_Core_Curve25519_Ge_Precomp(
                        ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($bas[$j][0]),
                        ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($bas[$j][1]),
                        ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($bas[$j][2])
                    );
                }
            }
        }
        /** @var array<int, array<int, ParagonIE_Sodium_Core_Curve25519_Ge_Precomp>> $base */
        if (!is_int($pos)) {
            throw new InvalidArgumentException('Position must be an integer');
        }
        if ($pos < 0 || $pos > 31) {
            throw new RangeException('Position is out of range [0, 31]');
        }

        $bnegative = self::negative($b);
        $babs = $b - (((-$bnegative) & $b) << 1);

        $t = self::ge_precomp_0();
        for ($i = 0; $i < 8; ++$i) {
            $t = self::cmov(
                $t,
                $base[$pos][$i],
                self::equal($babs, $i + 1)
            );
        }
        $minusT = new ParagonIE_Sodium_Core_Curve25519_Ge_Precomp(
            self::fe_copy($t->yminusx),
            self::fe_copy($t->yplusx),
            self::fe_neg($t->xy2d)
        );
        return self::cmov($t, $minusT, $bnegative);
    }

    /**
     * Subtract two group elements.
     *
     * r = p - q
     *
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_Cached $q
     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
     */
    public static function ge_sub(
        ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p,
        ParagonIE_Sodium_Core_Curve25519_Ge_Cached $q
    ) {
        $r = new ParagonIE_Sodium_Core_Curve25519_Ge_P1p1();

        $r->X = self::fe_add($p->Y, $p->X);
        $r->Y = self::fe_sub($p->Y, $p->X);
        $r->Z = self::fe_mul($r->X, $q->YminusX);
        $r->Y = self::fe_mul($r->Y, $q->YplusX);
        $r->T = self::fe_mul($q->T2d, $p->T);
        $r->X = self::fe_mul($p->Z, $q->Z);
        $t0 = self::fe_add($r->X, $r->X);
        $r->X = self::fe_sub($r->Z, $r->Y);
        $r->Y = self::fe_add($r->Z, $r->Y);
        $r->Z = self::fe_sub($t0, $r->T);
        $r->T = self::fe_add($t0, $r->T);

        return $r;
    }

    /**
     * Convert a group element to a byte string.
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P2 $h
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function ge_tobytes(ParagonIE_Sodium_Core_Curve25519_Ge_P2 $h)
    {
        $recip = self::fe_invert($h->Z);
        $x = self::fe_mul($h->X, $recip);
        $y = self::fe_mul($h->Y, $recip);
        $s = self::fe_tobytes($y);
        $s[31] = self::intToChr(
            self::chrToInt($s[31]) ^ (self::fe_isnegative($x) << 7)
        );
        return $s;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $a
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $A
     * @param string $b
     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P2
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     * @psalm-suppress MixedArrayAccess
     */
    public static function ge_double_scalarmult_vartime(
        $a,
        ParagonIE_Sodium_Core_Curve25519_Ge_P3 $A,
        $b
    ) {
        /** @var array<int, ParagonIE_Sodium_Core_Curve25519_Ge_Cached> $Ai */
        $Ai = array();

        /** @var array<int, ParagonIE_Sodium_Core_Curve25519_Ge_Precomp> $Bi */
        static $Bi = array();
        if (!$Bi) {
            for ($i = 0; $i < 8; ++$i) {
                $Bi[$i] = new ParagonIE_Sodium_Core_Curve25519_Ge_Precomp(
                    ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$base2[$i][0]),
                    ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$base2[$i][1]),
                    ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$base2[$i][2])
                );
            }
        }
        for ($i = 0; $i < 8; ++$i) {
            $Ai[$i] = new ParagonIE_Sodium_Core_Curve25519_Ge_Cached(
                self::fe_0(),
                self::fe_0(),
                self::fe_0(),
                self::fe_0()
            );
        }

        # slide(aslide,a);
        # slide(bslide,b);
        /** @var array<int, int> $aslide */
        $aslide = self::slide($a);
        /** @var array<int, int> $bslide */
        $bslide = self::slide($b);

        # ge_p3_to_cached(&Ai[0],A);
        # ge_p3_dbl(&t,A); ge_p1p1_to_p3(&A2,&t);
        $Ai[0] = self::ge_p3_to_cached($A);
        $t = self::ge_p3_dbl($A);
        $A2 = self::ge_p1p1_to_p3($t);

        # ge_add(&t,&A2,&Ai[0]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[1],&u);
        # ge_add(&t,&A2,&Ai[1]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[2],&u);
        # ge_add(&t,&A2,&Ai[2]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[3],&u);
        # ge_add(&t,&A2,&Ai[3]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[4],&u);
        # ge_add(&t,&A2,&Ai[4]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[5],&u);
        # ge_add(&t,&A2,&Ai[5]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[6],&u);
        # ge_add(&t,&A2,&Ai[6]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[7],&u);
        for ($i = 0; $i < 7; ++$i) {
            $t = self::ge_add($A2, $Ai[$i]);
            $u = self::ge_p1p1_to_p3($t);
            $Ai[$i + 1] = self::ge_p3_to_cached($u);
        }

        # ge_p2_0(r);
        $r = self::ge_p2_0();

        # for (i = 255;i >= 0;--i) {
        #     if (aslide[i] || bslide[i]) break;
        # }
        $i = 255;
        for (; $i >= 0; --$i) {
            if ($aslide[$i] || $bslide[$i]) {
                break;
            }
        }

        # for (;i >= 0;--i) {
        for (; $i >= 0; --$i) {
            # ge_p2_dbl(&t,r);
            $t = self::ge_p2_dbl($r);

            # if (aslide[i] > 0) {
            if ($aslide[$i] > 0) {
                # ge_p1p1_to_p3(&u,&t);
                # ge_add(&t,&u,&Ai[aslide[i]/2]);
                $u = self::ge_p1p1_to_p3($t);
                $t = self::ge_add(
                    $u,
                    $Ai[(int) floor($aslide[$i] / 2)]
                );
            # } else if (aslide[i] < 0) {
            } elseif ($aslide[$i] < 0) {
                # ge_p1p1_to_p3(&u,&t);
                # ge_sub(&t,&u,&Ai[(-aslide[i])/2]);
                $u = self::ge_p1p1_to_p3($t);
                $t = self::ge_sub(
                    $u,
                    $Ai[(int) floor(-$aslide[$i] / 2)]
                );
            }

            # if (bslide[i] > 0) {
            if ($bslide[$i] > 0) {
                /** @var int $index */
                $index = (int) floor($bslide[$i] / 2);
                # ge_p1p1_to_p3(&u,&t);
                # ge_madd(&t,&u,&Bi[bslide[i]/2]);
                $u = self::ge_p1p1_to_p3($t);
                $t = self::ge_madd($t, $u, $Bi[$index]);
            # } else if (bslide[i] < 0) {
            } elseif ($bslide[$i] < 0) {
                /** @var int $index */
                $index = (int) floor(-$bslide[$i] / 2);
                # ge_p1p1_to_p3(&u,&t);
                # ge_msub(&t,&u,&Bi[(-bslide[i])/2]);
                $u = self::ge_p1p1_to_p3($t);
                $t = self::ge_msub($t, $u, $Bi[$index]);
            }
            # ge_p1p1_to_p2(r,&t);
            $r = self::ge_p1p1_to_p2($t);
        }
        return $r;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $a
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P3
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedAssignment
     * @psalm-suppress MixedOperand
     */
    public static function ge_scalarmult($a, $p)
    {
        $e = array_fill(0, 64, 0);

        /** @var ParagonIE_Sodium_Core_Curve25519_Ge_Cached[] $pi */
        $pi = array();

        //        ge25519_p3_to_cached(&pi[1 - 1], p);   /* p */
        $pi[0] = self::ge_p3_to_cached($p);

        //        ge25519_p3_dbl(&t2, p);
        //        ge25519_p1p1_to_p3(&p2, &t2);
        //        ge25519_p3_to_cached(&pi[2 - 1], &p2); /* 2p = 2*p */
        $t2 = self::ge_p3_dbl($p);
        $p2 = self::ge_p1p1_to_p3($t2);
        $pi[1] = self::ge_p3_to_cached($p2);

        //        ge25519_add_cached(&t3, p, &pi[2 - 1]);
        //        ge25519_p1p1_to_p3(&p3, &t3);
        //        ge25519_p3_to_cached(&pi[3 - 1], &p3); /* 3p = 2p+p */
        $t3 = self::ge_add($p, $pi[1]);
        $p3 = self::ge_p1p1_to_p3($t3);
        $pi[2] = self::ge_p3_to_cached($p3);

        //        ge25519_p3_dbl(&t4, &p2);
        //        ge25519_p1p1_to_p3(&p4, &t4);
        //        ge25519_p3_to_cached(&pi[4 - 1], &p4); /* 4p = 2*2p */
        $t4 = self::ge_p3_dbl($p2);
        $p4 = self::ge_p1p1_to_p3($t4);
        $pi[3] = self::ge_p3_to_cached($p4);

        //        ge25519_add_cached(&t5, p, &pi[4 - 1]);
        //        ge25519_p1p1_to_p3(&p5, &t5);
        //        ge25519_p3_to_cached(&pi[5 - 1], &p5); /* 5p = 4p+p */
        $t5 = self::ge_add($p, $pi[3]);
        $p5 = self::ge_p1p1_to_p3($t5);
        $pi[4] = self::ge_p3_to_cached($p5);

        //        ge25519_p3_dbl(&t6, &p3);
        //        ge25519_p1p1_to_p3(&p6, &t6);
        //        ge25519_p3_to_cached(&pi[6 - 1], &p6); /* 6p = 2*3p */
        $t6 = self::ge_p3_dbl($p3);
        $p6 = self::ge_p1p1_to_p3($t6);
        $pi[5] = self::ge_p3_to_cached($p6);

        //        ge25519_add_cached(&t7, p, &pi[6 - 1]);
        //        ge25519_p1p1_to_p3(&p7, &t7);
        //        ge25519_p3_to_cached(&pi[7 - 1], &p7); /* 7p = 6p+p */
        $t7 = self::ge_add($p, $pi[5]);
        $p7 = self::ge_p1p1_to_p3($t7);
        $pi[6] = self::ge_p3_to_cached($p7);

        //        ge25519_p3_dbl(&t8, &p4);
        //        ge25519_p1p1_to_p3(&p8, &t8);
        //        ge25519_p3_to_cached(&pi[8 - 1], &p8); /* 8p = 2*4p */
        $t8 = self::ge_p3_dbl($p4);
        $p8 = self::ge_p1p1_to_p3($t8);
        $pi[7] = self::ge_p3_to_cached($p8);


        //        for (i = 0; i < 32; ++i) {
        //            e[2 * i + 0] = (a[i] >> 0) & 15;
        //            e[2 * i + 1] = (a[i] >> 4) & 15;
        //        }
        for ($i = 0; $i < 32; ++$i) {
            $e[($i << 1)    ] =  self::chrToInt($a[$i]) & 15;
            $e[($i << 1) + 1] = (self::chrToInt($a[$i]) >> 4) & 15;
        }
        //        /* each e[i] is between 0 and 15 */
        //        /* e[63] is between 0 and 7 */

        //        carry = 0;
        //        for (i = 0; i < 63; ++i) {
        //            e[i] += carry;
        //            carry = e[i] + 8;
        //            carry >>= 4;
        //            e[i] -= carry * ((signed char) 1 << 4);
        //        }
        $carry = 0;
        for ($i = 0; $i < 63; ++$i) {
            $e[$i] += $carry;
            $carry = $e[$i] + 8;
            $carry >>= 4;
            $e[$i] -= $carry << 4;
        }
        //        e[63] += carry;
        //        /* each e[i] is between -8 and 8 */
        $e[63] += $carry;

        //        ge25519_p3_0(h);
        $h = self::ge_p3_0();

        //        for (i = 63; i != 0; i--) {
        for ($i = 63; $i != 0; --$i) {
            // ge25519_cmov8_cached(&t, pi, e[i]);
            $t = self::ge_cmov8_cached($pi, $e[$i]);
            // ge25519_add_cached(&r, h, &t);
            $r = self::ge_add($h, $t);

            // ge25519_p1p1_to_p2(&s, &r);
            // ge25519_p2_dbl(&r, &s);
            // ge25519_p1p1_to_p2(&s, &r);
            // ge25519_p2_dbl(&r, &s);
            // ge25519_p1p1_to_p2(&s, &r);
            // ge25519_p2_dbl(&r, &s);
            // ge25519_p1p1_to_p2(&s, &r);
            // ge25519_p2_dbl(&r, &s);
            $s = self::ge_p1p1_to_p2($r);
            $r = self::ge_p2_dbl($s);
            $s = self::ge_p1p1_to_p2($r);
            $r = self::ge_p2_dbl($s);
            $s = self::ge_p1p1_to_p2($r);
            $r = self::ge_p2_dbl($s);
            $s = self::ge_p1p1_to_p2($r);
            $r = self::ge_p2_dbl($s);

            // ge25519_p1p1_to_p3(h, &r);  /* *16 */
            $h = self::ge_p1p1_to_p3($r); /* *16 */
        }

        //        ge25519_cmov8_cached(&t, pi, e[i]);
        //        ge25519_add_cached(&r, h, &t);
        //        ge25519_p1p1_to_p3(h, &r);
        $t = self::ge_cmov8_cached($pi, $e[0]);
        $r = self::ge_add($h, $t);
        return self::ge_p1p1_to_p3($r);
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $a
     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P3
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedAssignment
     * @psalm-suppress MixedOperand
     */
    public static function ge_scalarmult_base($a)
    {
        /** @var array<int, int> $e */
        $e = array();
        $r = new ParagonIE_Sodium_Core_Curve25519_Ge_P1p1();

        for ($i = 0; $i < 32; ++$i) {
            $dbl = (int) $i << 1;
            $e[$dbl] = (int) self::chrToInt($a[$i]) & 15;
            $e[$dbl + 1] = (int) (self::chrToInt($a[$i]) >> 4) & 15;
        }

        $carry = 0;
        for ($i = 0; $i < 63; ++$i) {
            $e[$i] += $carry;
            $carry = $e[$i] + 8;
            $carry >>= 4;
            $e[$i] -= $carry << 4;
        }
        $e[63] += (int) $carry;

        $h = self::ge_p3_0();

        for ($i = 1; $i < 64; $i += 2) {
            $t = self::ge_select((int) floor($i / 2), (int) $e[$i]);
            $r = self::ge_madd($r, $h, $t);
            $h = self::ge_p1p1_to_p3($r);
        }

        $r = self::ge_p3_dbl($h);

        $s = self::ge_p1p1_to_p2($r);
        $r = self::ge_p2_dbl($s);
        $s = self::ge_p1p1_to_p2($r);
        $r = self::ge_p2_dbl($s);
        $s = self::ge_p1p1_to_p2($r);
        $r = self::ge_p2_dbl($s);

        $h = self::ge_p1p1_to_p3($r);

        for ($i = 0; $i < 64; $i += 2) {
            $t = self::ge_select($i >> 1, (int) $e[$i]);
            $r = self::ge_madd($r, $h, $t);
            $h = self::ge_p1p1_to_p3($r);
        }
        return $h;
    }

    /**
     * Calculates (ab + c) mod l
     * where l = 2^252 + 27742317777372353535851937790883648493
     *
     * @internal You should not use this directly from another application
     *
     * @param string $a
     * @param string $b
     * @param string $c
     * @return string
     * @throws TypeError
     */
    public static function sc_muladd($a, $b, $c)
    {
        $a0 = 2097151 & self::load_3(self::substr($a, 0, 3));
        $a1 = 2097151 & (self::load_4(self::substr($a, 2, 4)) >> 5);
        $a2 = 2097151 & (self::load_3(self::substr($a, 5, 3)) >> 2);
        $a3 = 2097151 & (self::load_4(self::substr($a, 7, 4)) >> 7);
        $a4 = 2097151 & (self::load_4(self::substr($a, 10, 4)) >> 4);
        $a5 = 2097151 & (self::load_3(self::substr($a, 13, 3)) >> 1);
        $a6 = 2097151 & (self::load_4(self::substr($a, 15, 4)) >> 6);
        $a7 = 2097151 & (self::load_3(self::substr($a, 18, 3)) >> 3);
        $a8 = 2097151 & self::load_3(self::substr($a, 21, 3));
        $a9 = 2097151 & (self::load_4(self::substr($a, 23, 4)) >> 5);
        $a10 = 2097151 & (self::load_3(self::substr($a, 26, 3)) >> 2);
        $a11 = (self::load_4(self::substr($a, 28, 4)) >> 7);

        $b0 = 2097151 & self::load_3(self::substr($b, 0, 3));
        $b1 = 2097151 & (self::load_4(self::substr($b, 2, 4)) >> 5);
        $b2 = 2097151 & (self::load_3(self::substr($b, 5, 3)) >> 2);
        $b3 = 2097151 & (self::load_4(self::substr($b, 7, 4)) >> 7);
        $b4 = 2097151 & (self::load_4(self::substr($b, 10, 4)) >> 4);
        $b5 = 2097151 & (self::load_3(self::substr($b, 13, 3)) >> 1);
        $b6 = 2097151 & (self::load_4(self::substr($b, 15, 4)) >> 6);
        $b7 = 2097151 & (self::load_3(self::substr($b, 18, 3)) >> 3);
        $b8 = 2097151 & self::load_3(self::substr($b, 21, 3));
        $b9 = 2097151 & (self::load_4(self::substr($b, 23, 4)) >> 5);
        $b10 = 2097151 & (self::load_3(self::substr($b, 26, 3)) >> 2);
        $b11 = (self::load_4(self::substr($b, 28, 4)) >> 7);

        $c0 = 2097151 & self::load_3(self::substr($c, 0, 3));
        $c1 = 2097151 & (self::load_4(self::substr($c, 2, 4)) >> 5);
        $c2 = 2097151 & (self::load_3(self::substr($c, 5, 3)) >> 2);
        $c3 = 2097151 & (self::load_4(self::substr($c, 7, 4)) >> 7);
        $c4 = 2097151 & (self::load_4(self::substr($c, 10, 4)) >> 4);
        $c5 = 2097151 & (self::load_3(self::substr($c, 13, 3)) >> 1);
        $c6 = 2097151 & (self::load_4(self::substr($c, 15, 4)) >> 6);
        $c7 = 2097151 & (self::load_3(self::substr($c, 18, 3)) >> 3);
        $c8 = 2097151 & self::load_3(self::substr($c, 21, 3));
        $c9 = 2097151 & (self::load_4(self::substr($c, 23, 4)) >> 5);
        $c10 = 2097151 & (self::load_3(self::substr($c, 26, 3)) >> 2);
        $c11 = (self::load_4(self::substr($c, 28, 4)) >> 7);

        /* Can't really avoid the pyramid here: */
        $s0 = $c0 + self::mul($a0, $b0, 24);
        $s1 = $c1 + self::mul($a0, $b1, 24) + self::mul($a1, $b0, 24);
        $s2 = $c2 + self::mul($a0, $b2, 24) + self::mul($a1, $b1, 24) + self::mul($a2, $b0, 24);
        $s3 = $c3 + self::mul($a0, $b3, 24) + self::mul($a1, $b2, 24) + self::mul($a2, $b1, 24) + self::mul($a3, $b0, 24);
        $s4 = $c4 + self::mul($a0, $b4, 24) + self::mul($a1, $b3, 24) + self::mul($a2, $b2, 24) + self::mul($a3, $b1, 24) +
               self::mul($a4, $b0, 24);
        $s5 = $c5 + self::mul($a0, $b5, 24) + self::mul($a1, $b4, 24) + self::mul($a2, $b3, 24) + self::mul($a3, $b2, 24) +
               self::mul($a4, $b1, 24) + self::mul($a5, $b0, 24);
        $s6 = $c6 + self::mul($a0, $b6, 24) + self::mul($a1, $b5, 24) + self::mul($a2, $b4, 24) + self::mul($a3, $b3, 24) +
               self::mul($a4, $b2, 24) + self::mul($a5, $b1, 24) + self::mul($a6, $b0, 24);
        $s7 = $c7 + self::mul($a0, $b7, 24) + self::mul($a1, $b6, 24) + self::mul($a2, $b5, 24) + self::mul($a3, $b4, 24) +
               self::mul($a4, $b3, 24) + self::mul($a5, $b2, 24) + self::mul($a6, $b1, 24) + self::mul($a7, $b0, 24);
        $s8 = $c8 + self::mul($a0, $b8, 24) + self::mul($a1, $b7, 24) + self::mul($a2, $b6, 24) + self::mul($a3, $b5, 24) +
               self::mul($a4, $b4, 24) + self::mul($a5, $b3, 24) + self::mul($a6, $b2, 24) + self::mul($a7, $b1, 24) +
               self::mul($a8, $b0, 24);
        $s9 = $c9 + self::mul($a0, $b9, 24) + self::mul($a1, $b8, 24) + self::mul($a2, $b7, 24) + self::mul($a3, $b6, 24) +
               self::mul($a4, $b5, 24) + self::mul($a5, $b4, 24) + self::mul($a6, $b3, 24) + self::mul($a7, $b2, 24) +
               self::mul($a8, $b1, 24) + self::mul($a9, $b0, 24);
        $s10 = $c10 + self::mul($a0, $b10, 24) + self::mul($a1, $b9, 24) + self::mul($a2, $b8, 24) + self::mul($a3, $b7, 24) +
               self::mul($a4, $b6, 24) + self::mul($a5, $b5, 24) + self::mul($a6, $b4, 24) + self::mul($a7, $b3, 24) +
               self::mul($a8, $b2, 24) + self::mul($a9, $b1, 24) + self::mul($a10, $b0, 24);
        $s11 = $c11 + self::mul($a0, $b11, 24) + self::mul($a1, $b10, 24) + self::mul($a2, $b9, 24) + self::mul($a3, $b8, 24) +
               self::mul($a4, $b7, 24) + self::mul($a5, $b6, 24) + self::mul($a6, $b5, 24) + self::mul($a7, $b4, 24) +
               self::mul($a8, $b3, 24) + self::mul($a9, $b2, 24) + self::mul($a10, $b1, 24) + self::mul($a11, $b0, 24);
        $s12 = self::mul($a1, $b11, 24) + self::mul($a2, $b10, 24) + self::mul($a3, $b9, 24) + self::mul($a4, $b8, 24) +
               self::mul($a5, $b7, 24) + self::mul($a6, $b6, 24) + self::mul($a7, $b5, 24) + self::mul($a8, $b4, 24) +
               self::mul($a9, $b3, 24) + self::mul($a10, $b2, 24) + self::mul($a11, $b1, 24);
        $s13 = self::mul($a2, $b11, 24) + self::mul($a3, $b10, 24) + self::mul($a4, $b9, 24) + self::mul($a5, $b8, 24) +
               self::mul($a6, $b7, 24) + self::mul($a7, $b6, 24) + self::mul($a8, $b5, 24) + self::mul($a9, $b4, 24) +
               self::mul($a10, $b3, 24) + self::mul($a11, $b2, 24);
        $s14 = self::mul($a3, $b11, 24) + self::mul($a4, $b10, 24) + self::mul($a5, $b9, 24) + self::mul($a6, $b8, 24) +
               self::mul($a7, $b7, 24) + self::mul($a8, $b6, 24) + self::mul($a9, $b5, 24) + self::mul($a10, $b4, 24) +
               self::mul($a11, $b3, 24);
        $s15 = self::mul($a4, $b11, 24) + self::mul($a5, $b10, 24) + self::mul($a6, $b9, 24) + self::mul($a7, $b8, 24) +
               self::mul($a8, $b7, 24) + self::mul($a9, $b6, 24) + self::mul($a10, $b5, 24) + self::mul($a11, $b4, 24);
        $s16 = self::mul($a5, $b11, 24) + self::mul($a6, $b10, 24) + self::mul($a7, $b9, 24) + self::mul($a8, $b8, 24) +
               self::mul($a9, $b7, 24) + self::mul($a10, $b6, 24) + self::mul($a11, $b5, 24);
        $s17 = self::mul($a6, $b11, 24) + self::mul($a7, $b10, 24) + self::mul($a8, $b9, 24) + self::mul($a9, $b8, 24) +
               self::mul($a10, $b7, 24) + self::mul($a11, $b6, 24);
        $s18 = self::mul($a7, $b11, 24) + self::mul($a8, $b10, 24) + self::mul($a9, $b9, 24) + self::mul($a10, $b8, 24) +
               self::mul($a11, $b7, 24);
        $s19 = self::mul($a8, $b11, 24) + self::mul($a9, $b10, 24) + self::mul($a10, $b9, 24) + self::mul($a11, $b8, 24);
        $s20 = self::mul($a9, $b11, 24) + self::mul($a10, $b10, 24) + self::mul($a11, $b9, 24);
        $s21 = self::mul($a10, $b11, 24) + self::mul($a11, $b10, 24);
        $s22 = self::mul($a11, $b11, 24);
        $s23 = 0;

        $carry0 = ($s0 + (1 << 20)) >> 21;
        $s1 += $carry0;
        $s0 -= $carry0 << 21;
        $carry2 = ($s2 + (1 << 20)) >> 21;
        $s3 += $carry2;
        $s2 -= $carry2 << 21;
        $carry4 = ($s4 + (1 << 20)) >> 21;
        $s5 += $carry4;
        $s4 -= $carry4 << 21;
        $carry6 = ($s6 + (1 << 20)) >> 21;
        $s7 += $carry6;
        $s6 -= $carry6 << 21;
        $carry8 = ($s8 + (1 << 20)) >> 21;
        $s9 += $carry8;
        $s8 -= $carry8 << 21;
        $carry10 = ($s10 + (1 << 20)) >> 21;
        $s11 += $carry10;
        $s10 -= $carry10 << 21;
        $carry12 = ($s12 + (1 << 20)) >> 21;
        $s13 += $carry12;
        $s12 -= $carry12 << 21;
        $carry14 = ($s14 + (1 << 20)) >> 21;
        $s15 += $carry14;
        $s14 -= $carry14 << 21;
        $carry16 = ($s16 + (1 << 20)) >> 21;
        $s17 += $carry16;
        $s16 -= $carry16 << 21;
        $carry18 = ($s18 + (1 << 20)) >> 21;
        $s19 += $carry18;
        $s18 -= $carry18 << 21;
        $carry20 = ($s20 + (1 << 20)) >> 21;
        $s21 += $carry20;
        $s20 -= $carry20 << 21;
        $carry22 = ($s22 + (1 << 20)) >> 21;
        $s23 += $carry22;
        $s22 -= $carry22 << 21;

        $carry1 = ($s1 + (1 << 20)) >> 21;
        $s2 += $carry1;
        $s1 -= $carry1 << 21;
        $carry3 = ($s3 + (1 << 20)) >> 21;
        $s4 += $carry3;
        $s3 -= $carry3 << 21;
        $carry5 = ($s5 + (1 << 20)) >> 21;
        $s6 += $carry5;
        $s5 -= $carry5 << 21;
        $carry7 = ($s7 + (1 << 20)) >> 21;
        $s8 += $carry7;
        $s7 -= $carry7 << 21;
        $carry9 = ($s9 + (1 << 20)) >> 21;
        $s10 += $carry9;
        $s9 -= $carry9 << 21;
        $carry11 = ($s11 + (1 << 20)) >> 21;
        $s12 += $carry11;
        $s11 -= $carry11 << 21;
        $carry13 = ($s13 + (1 << 20)) >> 21;
        $s14 += $carry13;
        $s13 -= $carry13 << 21;
        $carry15 = ($s15 + (1 << 20)) >> 21;
        $s16 += $carry15;
        $s15 -= $carry15 << 21;
        $carry17 = ($s17 + (1 << 20)) >> 21;
        $s18 += $carry17;
        $s17 -= $carry17 << 21;
        $carry19 = ($s19 + (1 << 20)) >> 21;
        $s20 += $carry19;
        $s19 -= $carry19 << 21;
        $carry21 = ($s21 + (1 << 20)) >> 21;
        $s22 += $carry21;
        $s21 -= $carry21 << 21;

        $s11 += self::mul($s23, 666643, 20);
        $s12 += self::mul($s23, 470296, 19);
        $s13 += self::mul($s23, 654183, 20);
        $s14 -= self::mul($s23, 997805, 20);
        $s15 += self::mul($s23, 136657, 18);
        $s16 -= self::mul($s23, 683901, 20);

        $s10 += self::mul($s22, 666643, 20);
        $s11 += self::mul($s22, 470296, 19);
        $s12 += self::mul($s22, 654183, 20);
        $s13 -= self::mul($s22, 997805, 20);
        $s14 += self::mul($s22, 136657, 18);
        $s15 -= self::mul($s22, 683901, 20);

        $s9  += self::mul($s21,  666643, 20);
        $s10 += self::mul($s21,  470296, 19);
        $s11 += self::mul($s21,  654183, 20);
        $s12 -= self::mul($s21,  997805, 20);
        $s13 += self::mul($s21,  136657, 18);
        $s14 -= self::mul($s21,  683901, 20);

        $s8  += self::mul($s20,  666643, 20);
        $s9  += self::mul($s20,  470296, 19);
        $s10 += self::mul($s20,  654183, 20);
        $s11 -= self::mul($s20,  997805, 20);
        $s12 += self::mul($s20,  136657, 18);
        $s13 -= self::mul($s20,  683901, 20);

        $s7  += self::mul($s19,  666643, 20);
        $s8  += self::mul($s19,  470296, 19);
        $s9  += self::mul($s19,  654183, 20);
        $s10 -= self::mul($s19,  997805, 20);
        $s11 += self::mul($s19,  136657, 18);
        $s12 -= self::mul($s19,  683901, 20);

        $s6  += self::mul($s18,  666643, 20);
        $s7  += self::mul($s18,  470296, 19);
        $s8  += self::mul($s18,  654183, 20);
        $s9  -= self::mul($s18,  997805, 20);
        $s10 += self::mul($s18,  136657, 18);
        $s11 -= self::mul($s18,  683901, 20);

        $carry6 = ($s6 + (1 << 20)) >> 21;
        $s7 += $carry6;
        $s6 -= $carry6 << 21;
        $carry8 = ($s8 + (1 << 20)) >> 21;
        $s9 += $carry8;
        $s8 -= $carry8 << 21;
        $carry10 = ($s10 + (1 << 20)) >> 21;
        $s11 += $carry10;
        $s10 -= $carry10 << 21;
        $carry12 = ($s12 + (1 << 20)) >> 21;
        $s13 += $carry12;
        $s12 -= $carry12 << 21;
        $carry14 = ($s14 + (1 << 20)) >> 21;
        $s15 += $carry14;
        $s14 -= $carry14 << 21;
        $carry16 = ($s16 + (1 << 20)) >> 21;
        $s17 += $carry16;
        $s16 -= $carry16 << 21;

        $carry7 = ($s7 + (1 << 20)) >> 21;
        $s8 += $carry7;
        $s7 -= $carry7 << 21;
        $carry9 = ($s9 + (1 << 20)) >> 21;
        $s10 += $carry9;
        $s9 -= $carry9 << 21;
        $carry11 = ($s11 + (1 << 20)) >> 21;
        $s12 += $carry11;
        $s11 -= $carry11 << 21;
        $carry13 = ($s13 + (1 << 20)) >> 21;
        $s14 += $carry13;
        $s13 -= $carry13 << 21;
        $carry15 = ($s15 + (1 << 20)) >> 21;
        $s16 += $carry15;
        $s15 -= $carry15 << 21;

        $s5  += self::mul($s17,  666643, 20);
        $s6  += self::mul($s17,  470296, 19);
        $s7  += self::mul($s17,  654183, 20);
        $s8  -= self::mul($s17,  997805, 20);
        $s9  += self::mul($s17,  136657, 18);
        $s10 -= self::mul($s17,  683901, 20);

        $s4 += self::mul($s16,  666643, 20);
        $s5 += self::mul($s16,  470296, 19);
        $s6 += self::mul($s16,  654183, 20);
        $s7 -= self::mul($s16,  997805, 20);
        $s8 += self::mul($s16,  136657, 18);
        $s9 -= self::mul($s16,  683901, 20);

        $s3 += self::mul($s15,  666643, 20);
        $s4 += self::mul($s15,  470296, 19);
        $s5 += self::mul($s15,  654183, 20);
        $s6 -= self::mul($s15,  997805, 20);
        $s7 += self::mul($s15,  136657, 18);
        $s8 -= self::mul($s15,  683901, 20);

        $s2 += self::mul($s14,  666643, 20);
        $s3 += self::mul($s14,  470296, 19);
        $s4 += self::mul($s14,  654183, 20);
        $s5 -= self::mul($s14,  997805, 20);
        $s6 += self::mul($s14,  136657, 18);
        $s7 -= self::mul($s14,  683901, 20);

        $s1 += self::mul($s13,  666643, 20);
        $s2 += self::mul($s13,  470296, 19);
        $s3 += self::mul($s13,  654183, 20);
        $s4 -= self::mul($s13,  997805, 20);
        $s5 += self::mul($s13,  136657, 18);
        $s6 -= self::mul($s13,  683901, 20);

        $s0 += self::mul($s12,  666643, 20);
        $s1 += self::mul($s12,  470296, 19);
        $s2 += self::mul($s12,  654183, 20);
        $s3 -= self::mul($s12,  997805, 20);
        $s4 += self::mul($s12,  136657, 18);
        $s5 -= self::mul($s12,  683901, 20);
        $s12 = 0;

        $carry0 = ($s0 + (1 << 20)) >> 21;
        $s1 += $carry0;
        $s0 -= $carry0 << 21;
        $carry2 = ($s2 + (1 << 20)) >> 21;
        $s3 += $carry2;
        $s2 -= $carry2 << 21;
        $carry4 = ($s4 + (1 << 20)) >> 21;
        $s5 += $carry4;
        $s4 -= $carry4 << 21;
        $carry6 = ($s6 + (1 << 20)) >> 21;
        $s7 += $carry6;
        $s6 -= $carry6 << 21;
        $carry8 = ($s8 + (1 << 20)) >> 21;
        $s9 += $carry8;
        $s8 -= $carry8 << 21;
        $carry10 = ($s10 + (1 << 20)) >> 21;
        $s11 += $carry10;
        $s10 -= $carry10 << 21;

        $carry1 = ($s1 + (1 << 20)) >> 21;
        $s2 += $carry1;
        $s1 -= $carry1 << 21;
        $carry3 = ($s3 + (1 << 20)) >> 21;
        $s4 += $carry3;
        $s3 -= $carry3 << 21;
        $carry5 = ($s5 + (1 << 20)) >> 21;
        $s6 += $carry5;
        $s5 -= $carry5 << 21;
        $carry7 = ($s7 + (1 << 20)) >> 21;
        $s8 += $carry7;
        $s7 -= $carry7 << 21;
        $carry9 = ($s9 + (1 << 20)) >> 21;
        $s10 += $carry9;
        $s9 -= $carry9 << 21;
        $carry11 = ($s11 + (1 << 20)) >> 21;
        $s12 += $carry11;
        $s11 -= $carry11 << 21;

        $s0 += self::mul($s12,  666643, 20);
        $s1 += self::mul($s12,  470296, 19);
        $s2 += self::mul($s12,  654183, 20);
        $s3 -= self::mul($s12,  997805, 20);
        $s4 += self::mul($s12,  136657, 18);
        $s5 -= self::mul($s12,  683901, 20);
        $s12 = 0;

        $carry0 = $s0 >> 21;
        $s1 += $carry0;
        $s0 -= $carry0 << 21;
        $carry1 = $s1 >> 21;
        $s2 += $carry1;
        $s1 -= $carry1 << 21;
        $carry2 = $s2 >> 21;
        $s3 += $carry2;
        $s2 -= $carry2 << 21;
        $carry3 = $s3 >> 21;
        $s4 += $carry3;
        $s3 -= $carry3 << 21;
        $carry4 = $s4 >> 21;
        $s5 += $carry4;
        $s4 -= $carry4 << 21;
        $carry5 = $s5 >> 21;
        $s6 += $carry5;
        $s5 -= $carry5 << 21;
        $carry6 = $s6 >> 21;
        $s7 += $carry6;
        $s6 -= $carry6 << 21;
        $carry7 = $s7 >> 21;
        $s8 += $carry7;
        $s7 -= $carry7 << 21;
        $carry8 = $s8 >> 21;
        $s9 += $carry8;
        $s8 -= $carry8 << 21;
        $carry9 = $s9 >> 21;
        $s10 += $carry9;
        $s9 -= $carry9 << 21;
        $carry10 = $s10 >> 21;
        $s11 += $carry10;
        $s10 -= $carry10 << 21;
        $carry11 = $s11 >> 21;
        $s12 += $carry11;
        $s11 -= $carry11 << 21;

        $s0 += self::mul($s12,  666643, 20);
        $s1 += self::mul($s12,  470296, 19);
        $s2 += self::mul($s12,  654183, 20);
        $s3 -= self::mul($s12,  997805, 20);
        $s4 += self::mul($s12,  136657, 18);
        $s5 -= self::mul($s12,  683901, 20);

        $carry0 = $s0 >> 21;
        $s1 += $carry0;
        $s0 -= $carry0 << 21;
        $carry1 = $s1 >> 21;
        $s2 += $carry1;
        $s1 -= $carry1 << 21;
        $carry2 = $s2 >> 21;
        $s3 += $carry2;
        $s2 -= $carry2 << 21;
        $carry3 = $s3 >> 21;
        $s4 += $carry3;
        $s3 -= $carry3 << 21;
        $carry4 = $s4 >> 21;
        $s5 += $carry4;
        $s4 -= $carry4 << 21;
        $carry5 = $s5 >> 21;
        $s6 += $carry5;
        $s5 -= $carry5 << 21;
        $carry6 = $s6 >> 21;
        $s7 += $carry6;
        $s6 -= $carry6 << 21;
        $carry7 = $s7 >> 21;
        $s8 += $carry7;
        $s7 -= $carry7 << 21;
        $carry8 = $s8 >> 21;
        $s9 += $carry8;
        $s8 -= $carry8 << 21;
        $carry9 = $s9 >> 21;
        $s10 += $carry9;
        $s9 -= $carry9 << 21;
        $carry10 = $s10 >> 21;
        $s11 += $carry10;
        $s10 -= $carry10 << 21;

        /**
         * @var array<int, int>
         */
        $arr = array(
            (int) (0xff & ($s0 >> 0)),
            (int) (0xff & ($s0 >> 8)),
            (int) (0xff & (($s0 >> 16) | $s1 << 5)),
            (int) (0xff & ($s1 >> 3)),
            (int) (0xff & ($s1 >> 11)),
            (int) (0xff & (($s1 >> 19) | $s2 << 2)),
            (int) (0xff & ($s2 >> 6)),
            (int) (0xff & (($s2 >> 14) | $s3 << 7)),
            (int) (0xff & ($s3 >> 1)),
            (int) (0xff & ($s3 >> 9)),
            (int) (0xff & (($s3 >> 17) | $s4 << 4)),
            (int) (0xff & ($s4 >> 4)),
            (int) (0xff & ($s4 >> 12)),
            (int) (0xff & (($s4 >> 20) | $s5 << 1)),
            (int) (0xff & ($s5 >> 7)),
            (int) (0xff & (($s5 >> 15) | $s6 << 6)),
            (int) (0xff & ($s6 >> 2)),
            (int) (0xff & ($s6 >> 10)),
            (int) (0xff & (($s6 >> 18) | $s7 << 3)),
            (int) (0xff & ($s7 >> 5)),
            (int) (0xff & ($s7 >> 13)),
            (int) (0xff & ($s8 >> 0)),
            (int) (0xff & ($s8 >> 8)),
            (int) (0xff & (($s8 >> 16) | $s9 << 5)),
            (int) (0xff & ($s9 >> 3)),
            (int) (0xff & ($s9 >> 11)),
            (int) (0xff & (($s9 >> 19) | $s10 << 2)),
            (int) (0xff & ($s10 >> 6)),
            (int) (0xff & (($s10 >> 14) | $s11 << 7)),
            (int) (0xff & ($s11 >> 1)),
            (int) (0xff & ($s11 >> 9)),
            0xff & ($s11 >> 17)
        );
        return self::intArrayToString($arr);
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $s
     * @return string
     * @throws TypeError
     */
    public static function sc_reduce($s)
    {
        $s0 = 2097151 & self::load_3(self::substr($s, 0, 3));
        $s1 = 2097151 & (self::load_4(self::substr($s, 2, 4)) >> 5);
        $s2 = 2097151 & (self::load_3(self::substr($s, 5, 3)) >> 2);
        $s3 = 2097151 & (self::load_4(self::substr($s, 7, 4)) >> 7);
        $s4 = 2097151 & (self::load_4(self::substr($s, 10, 4)) >> 4);
        $s5 = 2097151 & (self::load_3(self::substr($s, 13, 3)) >> 1);
        $s6 = 2097151 & (self::load_4(self::substr($s, 15, 4)) >> 6);
        $s7 = 2097151 & (self::load_3(self::substr($s, 18, 4)) >> 3);
        $s8 = 2097151 & self::load_3(self::substr($s, 21, 3));
        $s9 = 2097151 & (self::load_4(self::substr($s, 23, 4)) >> 5);
        $s10 = 2097151 & (self::load_3(self::substr($s, 26, 3)) >> 2);
        $s11 = 2097151 & (self::load_4(self::substr($s, 28, 4)) >> 7);
        $s12 = 2097151 & (self::load_4(self::substr($s, 31, 4)) >> 4);
        $s13 = 2097151 & (self::load_3(self::substr($s, 34, 3)) >> 1);
        $s14 = 2097151 & (self::load_4(self::substr($s, 36, 4)) >> 6);
        $s15 = 2097151 & (self::load_3(self::substr($s, 39, 4)) >> 3);
        $s16 = 2097151 & self::load_3(self::substr($s, 42, 3));
        $s17 = 2097151 & (self::load_4(self::substr($s, 44, 4)) >> 5);
        $s18 = 2097151 & (self::load_3(self::substr($s, 47, 3)) >> 2);
        $s19 = 2097151 & (self::load_4(self::substr($s, 49, 4)) >> 7);
        $s20 = 2097151 & (self::load_4(self::substr($s, 52, 4)) >> 4);
        $s21 = 2097151 & (self::load_3(self::substr($s, 55, 3)) >> 1);
        $s22 = 2097151 & (self::load_4(self::substr($s, 57, 4)) >> 6);
        $s23 = 0x1fffffff & (self::load_4(self::substr($s, 60, 4)) >> 3);

        $s11 += self::mul($s23,  666643, 20);
        $s12 += self::mul($s23,  470296, 19);
        $s13 += self::mul($s23,  654183, 20);
        $s14 -= self::mul($s23,  997805, 20);
        $s15 += self::mul($s23,  136657, 18);
        $s16 -= self::mul($s23,  683901, 20);

        $s10 += self::mul($s22,  666643, 20);
        $s11 += self::mul($s22,  470296, 19);
        $s12 += self::mul($s22,  654183, 20);
        $s13 -= self::mul($s22,  997805, 20);
        $s14 += self::mul($s22,  136657, 18);
        $s15 -= self::mul($s22,  683901, 20);

        $s9  += self::mul($s21,  666643, 20);
        $s10 += self::mul($s21,  470296, 19);
        $s11 += self::mul($s21,  654183, 20);
        $s12 -= self::mul($s21,  997805, 20);
        $s13 += self::mul($s21,  136657, 18);
        $s14 -= self::mul($s21,  683901, 20);

        $s8  += self::mul($s20,  666643, 20);
        $s9  += self::mul($s20,  470296, 19);
        $s10 += self::mul($s20,  654183, 20);
        $s11 -= self::mul($s20,  997805, 20);
        $s12 += self::mul($s20,  136657, 18);
        $s13 -= self::mul($s20,  683901, 20);

        $s7  += self::mul($s19,  666643, 20);
        $s8  += self::mul($s19,  470296, 19);
        $s9  += self::mul($s19,  654183, 20);
        $s10 -= self::mul($s19,  997805, 20);
        $s11 += self::mul($s19,  136657, 18);
        $s12 -= self::mul($s19,  683901, 20);

        $s6  += self::mul($s18,  666643, 20);
        $s7  += self::mul($s18,  470296, 19);
        $s8  += self::mul($s18,  654183, 20);
        $s9  -= self::mul($s18,  997805, 20);
        $s10 += self::mul($s18,  136657, 18);
        $s11 -= self::mul($s18,  683901, 20);

        $carry6 = ($s6 + (1 << 20)) >> 21;
        $s7 += $carry6;
        $s6 -= $carry6 << 21;
        $carry8 = ($s8 + (1 << 20)) >> 21;
        $s9 += $carry8;
        $s8 -= $carry8 << 21;
        $carry10 = ($s10 + (1 << 20)) >> 21;
        $s11 += $carry10;
        $s10 -= $carry10 << 21;
        $carry12 = ($s12 + (1 << 20)) >> 21;
        $s13 += $carry12;
        $s12 -= $carry12 << 21;
        $carry14 = ($s14 + (1 << 20)) >> 21;
        $s15 += $carry14;
        $s14 -= $carry14 << 21;
        $carry16 = ($s16 + (1 << 20)) >> 21;
        $s17 += $carry16;
        $s16 -= $carry16 << 21;

        $carry7 = ($s7 + (1 << 20)) >> 21;
        $s8 += $carry7;
        $s7 -= $carry7 << 21;
        $carry9 = ($s9 + (1 << 20)) >> 21;
        $s10 += $carry9;
        $s9 -= $carry9 << 21;
        $carry11 = ($s11 + (1 << 20)) >> 21;
        $s12 += $carry11;
        $s11 -= $carry11 << 21;
        $carry13 = ($s13 + (1 << 20)) >> 21;
        $s14 += $carry13;
        $s13 -= $carry13 << 21;
        $carry15 = ($s15 + (1 << 20)) >> 21;
        $s16 += $carry15;
        $s15 -= $carry15 << 21;

        $s5  += self::mul($s17,  666643, 20);
        $s6  += self::mul($s17,  470296, 19);
        $s7  += self::mul($s17,  654183, 20);
        $s8  -= self::mul($s17,  997805, 20);
        $s9  += self::mul($s17,  136657, 18);
        $s10 -= self::mul($s17,  683901, 20);

        $s4 += self::mul($s16,  666643, 20);
        $s5 += self::mul($s16,  470296, 19);
        $s6 += self::mul($s16,  654183, 20);
        $s7 -= self::mul($s16,  997805, 20);
        $s8 += self::mul($s16,  136657, 18);
        $s9 -= self::mul($s16,  683901, 20);

        $s3 += self::mul($s15,  666643, 20);
        $s4 += self::mul($s15,  470296, 19);
        $s5 += self::mul($s15,  654183, 20);
        $s6 -= self::mul($s15,  997805, 20);
        $s7 += self::mul($s15,  136657, 18);
        $s8 -= self::mul($s15,  683901, 20);

        $s2 += self::mul($s14,  666643, 20);
        $s3 += self::mul($s14,  470296, 19);
        $s4 += self::mul($s14,  654183, 20);
        $s5 -= self::mul($s14,  997805, 20);
        $s6 += self::mul($s14,  136657, 18);
        $s7 -= self::mul($s14,  683901, 20);

        $s1 += self::mul($s13,  666643, 20);
        $s2 += self::mul($s13,  470296, 19);
        $s3 += self::mul($s13,  654183, 20);
        $s4 -= self::mul($s13,  997805, 20);
        $s5 += self::mul($s13,  136657, 18);
        $s6 -= self::mul($s13,  683901, 20);

        $s0 += self::mul($s12,  666643, 20);
        $s1 += self::mul($s12,  470296, 19);
        $s2 += self::mul($s12,  654183, 20);
        $s3 -= self::mul($s12,  997805, 20);
        $s4 += self::mul($s12,  136657, 18);
        $s5 -= self::mul($s12,  683901, 20);
        $s12 = 0;

        $carry0 = ($s0 + (1 << 20)) >> 21;
        $s1 += $carry0;
        $s0 -= $carry0 << 21;
        $carry2 = ($s2 + (1 << 20)) >> 21;
        $s3 += $carry2;
        $s2 -= $carry2 << 21;
        $carry4 = ($s4 + (1 << 20)) >> 21;
        $s5 += $carry4;
        $s4 -= $carry4 << 21;
        $carry6 = ($s6 + (1 << 20)) >> 21;
        $s7 += $carry6;
        $s6 -= $carry6 << 21;
        $carry8 = ($s8 + (1 << 20)) >> 21;
        $s9 += $carry8;
        $s8 -= $carry8 << 21;
        $carry10 = ($s10 + (1 << 20)) >> 21;
        $s11 += $carry10;
        $s10 -= $carry10 << 21;

        $carry1 = ($s1 + (1 << 20)) >> 21;
        $s2 += $carry1;
        $s1 -= $carry1 << 21;
        $carry3 = ($s3 + (1 << 20)) >> 21;
        $s4 += $carry3;
        $s3 -= $carry3 << 21;
        $carry5 = ($s5 + (1 << 20)) >> 21;
        $s6 += $carry5;
        $s5 -= $carry5 << 21;
        $carry7 = ($s7 + (1 << 20)) >> 21;
        $s8 += $carry7;
        $s7 -= $carry7 << 21;
        $carry9 = ($s9 + (1 << 20)) >> 21;
        $s10 += $carry9;
        $s9 -= $carry9 << 21;
        $carry11 = ($s11 + (1 << 20)) >> 21;
        $s12 += $carry11;
        $s11 -= $carry11 << 21;

        $s0 += self::mul($s12,  666643, 20);
        $s1 += self::mul($s12,  470296, 19);
        $s2 += self::mul($s12,  654183, 20);
        $s3 -= self::mul($s12,  997805, 20);
        $s4 += self::mul($s12,  136657, 18);
        $s5 -= self::mul($s12,  683901, 20);
        $s12 = 0;

        $carry0 = $s0 >> 21;
        $s1 += $carry0;
        $s0 -= $carry0 << 21;
        $carry1 = $s1 >> 21;
        $s2 += $carry1;
        $s1 -= $carry1 << 21;
        $carry2 = $s2 >> 21;
        $s3 += $carry2;
        $s2 -= $carry2 << 21;
        $carry3 = $s3 >> 21;
        $s4 += $carry3;
        $s3 -= $carry3 << 21;
        $carry4 = $s4 >> 21;
        $s5 += $carry4;
        $s4 -= $carry4 << 21;
        $carry5 = $s5 >> 21;
        $s6 += $carry5;
        $s5 -= $carry5 << 21;
        $carry6 = $s6 >> 21;
        $s7 += $carry6;
        $s6 -= $carry6 << 21;
        $carry7 = $s7 >> 21;
        $s8 += $carry7;
        $s7 -= $carry7 << 21;
        $carry8 = $s8 >> 21;
        $s9 += $carry8;
        $s8 -= $carry8 << 21;
        $carry9 = $s9 >> 21;
        $s10 += $carry9;
        $s9 -= $carry9 << 21;
        $carry10 = $s10 >> 21;
        $s11 += $carry10;
        $s10 -= $carry10 << 21;
        $carry11 = $s11 >> 21;
        $s12 += $carry11;
        $s11 -= $carry11 << 21;

        $s0 += self::mul($s12,  666643, 20);
        $s1 += self::mul($s12,  470296, 19);
        $s2 += self::mul($s12,  654183, 20);
        $s3 -= self::mul($s12,  997805, 20);
        $s4 += self::mul($s12,  136657, 18);
        $s5 -= self::mul($s12,  683901, 20);

        $carry0 = $s0 >> 21;
        $s1 += $carry0;
        $s0 -= $carry0 << 21;
        $carry1 = $s1 >> 21;
        $s2 += $carry1;
        $s1 -= $carry1 << 21;
        $carry2 = $s2 >> 21;
        $s3 += $carry2;
        $s2 -= $carry2 << 21;
        $carry3 = $s3 >> 21;
        $s4 += $carry3;
        $s3 -= $carry3 << 21;
        $carry4 = $s4 >> 21;
        $s5 += $carry4;
        $s4 -= $carry4 << 21;
        $carry5 = $s5 >> 21;
        $s6 += $carry5;
        $s5 -= $carry5 << 21;
        $carry6 = $s6 >> 21;
        $s7 += $carry6;
        $s6 -= $carry6 << 21;
        $carry7 = $s7 >> 21;
        $s8 += $carry7;
        $s7 -= $carry7 << 21;
        $carry8 = $s8 >> 21;
        $s9 += $carry8;
        $s8 -= $carry8 << 21;
        $carry9 = $s9 >> 21;
        $s10 += $carry9;
        $s9 -= $carry9 << 21;
        $carry10 = $s10 >> 21;
        $s11 += $carry10;
        $s10 -= $carry10 << 21;

        /**
         * @var array<int, int>
         */
        $arr = array(
            (int) ($s0 >> 0),
            (int) ($s0 >> 8),
            (int) (($s0 >> 16) | $s1 << 5),
            (int) ($s1 >> 3),
            (int) ($s1 >> 11),
            (int) (($s1 >> 19) | $s2 << 2),
            (int) ($s2 >> 6),
            (int) (($s2 >> 14) | $s3 << 7),
            (int) ($s3 >> 1),
            (int) ($s3 >> 9),
            (int) (($s3 >> 17) | $s4 << 4),
            (int) ($s4 >> 4),
            (int) ($s4 >> 12),
            (int) (($s4 >> 20) | $s5 << 1),
            (int) ($s5 >> 7),
            (int) (($s5 >> 15) | $s6 << 6),
            (int) ($s6 >> 2),
            (int) ($s6 >> 10),
            (int) (($s6 >> 18) | $s7 << 3),
            (int) ($s7 >> 5),
            (int) ($s7 >> 13),
            (int) ($s8 >> 0),
            (int) ($s8 >> 8),
            (int) (($s8 >> 16) | $s9 << 5),
            (int) ($s9 >> 3),
            (int) ($s9 >> 11),
            (int) (($s9 >> 19) | $s10 << 2),
            (int) ($s10 >> 6),
            (int) (($s10 >> 14) | $s11 << 7),
            (int) ($s11 >> 1),
            (int) ($s11 >> 9),
            (int) $s11 >> 17
        );
        return self::intArrayToString($arr);
    }

    /**
     * multiply by the order of the main subgroup l = 2^252+27742317777372353535851937790883648493
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $A
     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P3
     */
    public static function ge_mul_l(ParagonIE_Sodium_Core_Curve25519_Ge_P3 $A)
    {
        $aslide = array(
            13, 0, 0, 0, 0, -1, 0, 0, 0, 0, -11, 0, 0, 0, 0, 0, 0, -5, 0, 0, 0,
            0, 0, 0, -3, 0, 0, 0, 0, -13, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 3, 0,
            0, 0, 0, -13, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 0, 11, 0, 0, 0,
            0, 0, 11, 0, 0, 0, 0, -13, 0, 0, 0, 0, 0, 0, -3, 0, 0, 0, 0, 0, -1,
            0, 0, 0, 0, 3, 0, 0, 0, 0, -11, 0, 0, 0, 0, 0, 0, 0, 15, 0, 0, 0,
            0, 0, -1, 0, 0, 0, 0, -1, 0, 0, 0, 0, 7, 0, 0, 0, 0, 5, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
        );

        /** @var array<int, ParagonIE_Sodium_Core_Curve25519_Ge_Cached> $Ai size 8 */
        $Ai = array();

        # ge_p3_to_cached(&Ai[0], A);
        $Ai[0] = self::ge_p3_to_cached($A);
        # ge_p3_dbl(&t, A);
        $t = self::ge_p3_dbl($A);
        # ge_p1p1_to_p3(&A2, &t);
        $A2 = self::ge_p1p1_to_p3($t);

        for ($i = 1; $i < 8; ++$i) {
            # ge_add(&t, &A2, &Ai[0]);
            $t = self::ge_add($A2, $Ai[$i - 1]);
            # ge_p1p1_to_p3(&u, &t);
            $u = self::ge_p1p1_to_p3($t);
            # ge_p3_to_cached(&Ai[i], &u);
            $Ai[$i] = self::ge_p3_to_cached($u);
        }

        $r = self::ge_p3_0();
        for ($i = 252; $i >= 0; --$i) {
            $t = self::ge_p3_dbl($r);
            if ($aslide[$i] > 0) {
                # ge_p1p1_to_p3(&u, &t);
                $u = self::ge_p1p1_to_p3($t);
                # ge_add(&t, &u, &Ai[aslide[i] / 2]);
                $t = self::ge_add($u, $Ai[(int)($aslide[$i] / 2)]);
            } elseif ($aslide[$i] < 0) {
                # ge_p1p1_to_p3(&u, &t);
                $u = self::ge_p1p1_to_p3($t);
                # ge_sub(&t, &u, &Ai[(-aslide[i]) / 2]);
                $t = self::ge_sub($u, $Ai[(int)(-$aslide[$i] / 2)]);
            }
        }

        # ge_p1p1_to_p3(r, &t);
        return self::ge_p1p1_to_p3($t);
    }

    /**
     * @param string $a
     * @param string $b
     * @return string
     */
    public static function sc25519_mul($a, $b)
    {
        //    int64_t a0  = 2097151 & load_3(a);
        //    int64_t a1  = 2097151 & (load_4(a + 2) >> 5);
        //    int64_t a2  = 2097151 & (load_3(a + 5) >> 2);
        //    int64_t a3  = 2097151 & (load_4(a + 7) >> 7);
        //    int64_t a4  = 2097151 & (load_4(a + 10) >> 4);
        //    int64_t a5  = 2097151 & (load_3(a + 13) >> 1);
        //    int64_t a6  = 2097151 & (load_4(a + 15) >> 6);
        //    int64_t a7  = 2097151 & (load_3(a + 18) >> 3);
        //    int64_t a8  = 2097151 & load_3(a + 21);
        //    int64_t a9  = 2097151 & (load_4(a + 23) >> 5);
        //    int64_t a10 = 2097151 & (load_3(a + 26) >> 2);
        //    int64_t a11 = (load_4(a + 28) >> 7);
        $a0  = 2097151 &  self::load_3(self::substr($a, 0, 3));
        $a1  = 2097151 & (self::load_4(self::substr($a, 2, 4)) >> 5);
        $a2  = 2097151 & (self::load_3(self::substr($a, 5, 3)) >> 2);
        $a3  = 2097151 & (self::load_4(self::substr($a, 7, 4)) >> 7);
        $a4  = 2097151 & (self::load_4(self::substr($a, 10, 4)) >> 4);
        $a5  = 2097151 & (self::load_3(self::substr($a, 13, 3)) >> 1);
        $a6  = 2097151 & (self::load_4(self::substr($a, 15, 4)) >> 6);
        $a7  = 2097151 & (self::load_3(self::substr($a, 18, 3)) >> 3);
        $a8  = 2097151 &  self::load_3(self::substr($a, 21, 3));
        $a9  = 2097151 & (self::load_4(self::substr($a, 23, 4)) >> 5);
        $a10 = 2097151 & (self::load_3(self::substr($a, 26, 3)) >> 2);
        $a11 = (self::load_4(self::substr($a, 28, 4)) >> 7);

        //    int64_t b0  = 2097151 & load_3(b);
        //    int64_t b1  = 2097151 & (load_4(b + 2) >> 5);
        //    int64_t b2  = 2097151 & (load_3(b + 5) >> 2);
        //    int64_t b3  = 2097151 & (load_4(b + 7) >> 7);
        //    int64_t b4  = 2097151 & (load_4(b + 10) >> 4);
        //    int64_t b5  = 2097151 & (load_3(b + 13) >> 1);
        //    int64_t b6  = 2097151 & (load_4(b + 15) >> 6);
        //    int64_t b7  = 2097151 & (load_3(b + 18) >> 3);
        //    int64_t b8  = 2097151 & load_3(b + 21);
        //    int64_t b9  = 2097151 & (load_4(b + 23) >> 5);
        //    int64_t b10 = 2097151 & (load_3(b + 26) >> 2);
        //    int64_t b11 = (load_4(b + 28) >> 7);
        $b0  = 2097151 &  self::load_3(self::substr($b, 0, 3));
        $b1  = 2097151 & (self::load_4(self::substr($b, 2, 4)) >> 5);
        $b2  = 2097151 & (self::load_3(self::substr($b, 5, 3)) >> 2);
        $b3  = 2097151 & (self::load_4(self::substr($b, 7, 4)) >> 7);
        $b4  = 2097151 & (self::load_4(self::substr($b, 10, 4)) >> 4);
        $b5  = 2097151 & (self::load_3(self::substr($b, 13, 3)) >> 1);
        $b6  = 2097151 & (self::load_4(self::substr($b, 15, 4)) >> 6);
        $b7  = 2097151 & (self::load_3(self::substr($b, 18, 3)) >> 3);
        $b8  = 2097151 &  self::load_3(self::substr($b, 21, 3));
        $b9  = 2097151 & (self::load_4(self::substr($b, 23, 4)) >> 5);
        $b10 = 2097151 & (self::load_3(self::substr($b, 26, 3)) >> 2);
        $b11 = (self::load_4(self::substr($b, 28, 4)) >> 7);

        //    s0 = a0 * b0;
        //    s1 = a0 * b1 + a1 * b0;
        //    s2 = a0 * b2 + a1 * b1 + a2 * b0;
        //    s3 = a0 * b3 + a1 * b2 + a2 * b1 + a3 * b0;
        //    s4 = a0 * b4 + a1 * b3 + a2 * b2 + a3 * b1 + a4 * b0;
        //    s5 = a0 * b5 + a1 * b4 + a2 * b3 + a3 * b2 + a4 * b1 + a5 * b0;
        //    s6 = a0 * b6 + a1 * b5 + a2 * b4 + a3 * b3 + a4 * b2 + a5 * b1 + a6 * b0;
        //    s7 = a0 * b7 + a1 * b6 + a2 * b5 + a3 * b4 + a4 * b3 + a5 * b2 +
        //        a6 * b1 + a7 * b0;
        //    s8 = a0 * b8 + a1 * b7 + a2 * b6 + a3 * b5 + a4 * b4 + a5 * b3 +
        //        a6 * b2 + a7 * b1 + a8 * b0;
        //    s9 = a0 * b9 + a1 * b8 + a2 * b7 + a3 * b6 + a4 * b5 + a5 * b4 +
        //        a6 * b3 + a7 * b2 + a8 * b1 + a9 * b0;
        //    s10 = a0 * b10 + a1 * b9 + a2 * b8 + a3 * b7 + a4 * b6 + a5 * b5 +
        //        a6 * b4 + a7 * b3 + a8 * b2 + a9 * b1 + a10 * b0;
        //    s11 = a0 * b11 + a1 * b10 + a2 * b9 + a3 * b8 + a4 * b7 + a5 * b6 +
        //        a6 * b5 + a7 * b4 + a8 * b3 + a9 * b2 + a10 * b1 + a11 * b0;
        //    s12 = a1 * b11 + a2 * b10 + a3 * b9 + a4 * b8 + a5 * b7 + a6 * b6 +
        //        a7 * b5 + a8 * b4 + a9 * b3 + a10 * b2 + a11 * b1;
        //    s13 = a2 * b11 + a3 * b10 + a4 * b9 + a5 * b8 + a6 * b7 + a7 * b6 +
        //        a8 * b5 + a9 * b4 + a10 * b3 + a11 * b2;
        //    s14 = a3 * b11 + a4 * b10 + a5 * b9 + a6 * b8 + a7 * b7 + a8 * b6 +
        //        a9 * b5 + a10 * b4 + a11 * b3;
        //    s15 = a4 * b11 + a5 * b10 + a6 * b9 + a7 * b8 + a8 * b7 + a9 * b6 +
        //        a10 * b5 + a11 * b4;
        //    s16 =
        //        a5 * b11 + a6 * b10 + a7 * b9 + a8 * b8 + a9 * b7 + a10 * b6 + a11 * b5;
        //    s17 = a6 * b11 + a7 * b10 + a8 * b9 + a9 * b8 + a10 * b7 + a11 * b6;
        //    s18 = a7 * b11 + a8 * b10 + a9 * b9 + a10 * b8 + a11 * b7;
        //    s19 = a8 * b11 + a9 * b10 + a10 * b9 + a11 * b8;
        //    s20 = a9 * b11 + a10 * b10 + a11 * b9;
        //    s21 = a10 * b11 + a11 * b10;
        //    s22 = a11 * b11;
        //    s23 = 0;
        $s0 = self::mul($a0, $b0, 22);
        $s1 = self::mul($a0, $b1, 22) + self::mul($a1, $b0, 22);
        $s2 = self::mul($a0, $b2, 22) + self::mul($a1, $b1, 22) + self::mul($a2, $b0, 22);
        $s3 = self::mul($a0, $b3, 22) + self::mul($a1, $b2, 22) + self::mul($a2, $b1, 22) + self::mul($a3, $b0, 22);
        $s4 = self::mul($a0, $b4, 22) + self::mul($a1, $b3, 22) + self::mul($a2, $b2, 22) + self::mul($a3, $b1, 22) +
            self::mul($a4, $b0, 22);
        $s5 = self::mul($a0, $b5, 22) + self::mul($a1, $b4, 22) + self::mul($a2, $b3, 22) + self::mul($a3, $b2, 22) +
            self::mul($a4, $b1, 22) + self::mul($a5, $b0, 22);
        $s6 = self::mul($a0, $b6, 22) + self::mul($a1, $b5, 22) + self::mul($a2, $b4, 22) + self::mul($a3, $b3, 22) +
            self::mul($a4, $b2, 22) + self::mul($a5, $b1, 22) + self::mul($a6, $b0, 22);
        $s7 = self::mul($a0, $b7, 22) + self::mul($a1, $b6, 22) + self::mul($a2, $b5, 22) + self::mul($a3, $b4, 22) +
            self::mul($a4, $b3, 22) + self::mul($a5, $b2, 22) + self::mul($a6, $b1, 22) + self::mul($a7, $b0, 22);
        $s8 = self::mul($a0, $b8, 22) + self::mul($a1, $b7, 22) + self::mul($a2, $b6, 22) + self::mul($a3, $b5, 22) +
            self::mul($a4, $b4, 22) + self::mul($a5, $b3, 22) + self::mul($a6, $b2, 22) + self::mul($a7, $b1, 22) +
            self::mul($a8, $b0, 22);
        $s9 = self::mul($a0, $b9, 22) + self::mul($a1, $b8, 22) + self::mul($a2, $b7, 22) + self::mul($a3, $b6, 22) +
            self::mul($a4, $b5, 22) + self::mul($a5, $b4, 22) + self::mul($a6, $b3, 22) + self::mul($a7, $b2, 22) +
            self::mul($a8, $b1, 22) + self::mul($a9, $b0, 22);
        $s10 = self::mul($a0, $b10, 22) + self::mul($a1, $b9, 22) + self::mul($a2, $b8, 22) + self::mul($a3, $b7, 22) +
            self::mul($a4, $b6, 22) + self::mul($a5, $b5, 22) + self::mul($a6, $b4, 22) + self::mul($a7, $b3, 22) +
            self::mul($a8, $b2, 22) + self::mul($a9, $b1, 22) + self::mul($a10, $b0, 22);
        $s11 = self::mul($a0, $b11, 22) + self::mul($a1, $b10, 22) + self::mul($a2, $b9, 22) + self::mul($a3, $b8, 22) +
            self::mul($a4, $b7, 22) + self::mul($a5, $b6, 22) + self::mul($a6, $b5, 22) + self::mul($a7, $b4, 22) +
            self::mul($a8, $b3, 22) + self::mul($a9, $b2, 22) + self::mul($a10, $b1, 22) + self::mul($a11, $b0, 22);
        $s12 = self::mul($a1, $b11, 22) + self::mul($a2, $b10, 22) + self::mul($a3, $b9, 22) + self::mul($a4, $b8, 22) +
            self::mul($a5, $b7, 22) + self::mul($a6, $b6, 22) + self::mul($a7, $b5, 22) + self::mul($a8, $b4, 22) +
            self::mul($a9, $b3, 22) + self::mul($a10, $b2, 22) + self::mul($a11, $b1, 22);
        $s13 = self::mul($a2, $b11, 22) + self::mul($a3, $b10, 22) + self::mul($a4, $b9, 22) + self::mul($a5, $b8, 22) +
            self::mul($a6, $b7, 22) + self::mul($a7, $b6, 22) + self::mul($a8, $b5, 22) + self::mul($a9, $b4, 22) +
            self::mul($a10, $b3, 22) + self::mul($a11, $b2, 22);
        $s14 = self::mul($a3, $b11, 22) + self::mul($a4, $b10, 22) + self::mul($a5, $b9, 22) + self::mul($a6, $b8, 22) +
            self::mul($a7, $b7, 22) + self::mul($a8, $b6, 22) + self::mul($a9, $b5, 22) + self::mul($a10, $b4, 22) +
            self::mul($a11, $b3, 22);
        $s15 = self::mul($a4, $b11, 22) + self::mul($a5, $b10, 22) + self::mul($a6, $b9, 22) + self::mul($a7, $b8, 22) +
            self::mul($a8, $b7, 22) + self::mul($a9, $b6, 22) + self::mul($a10, $b5, 22) + self::mul($a11, $b4, 22);
        $s16 =
            self::mul($a5, $b11, 22) + self::mul($a6, $b10, 22) + self::mul($a7, $b9, 22) + self::mul($a8, $b8, 22) +
            self::mul($a9, $b7, 22) + self::mul($a10, $b6, 22) + self::mul($a11, $b5, 22);
        $s17 = self::mul($a6, $b11, 22) + self::mul($a7, $b10, 22) + self::mul($a8, $b9, 22) + self::mul($a9, $b8, 22) +
            self::mul($a10, $b7, 22) + self::mul($a11, $b6, 22);
        $s18 = self::mul($a7, $b11, 22) + self::mul($a8, $b10, 22) + self::mul($a9, $b9, 22) + self::mul($a10, $b8, 22)
            + self::mul($a11, $b7, 22);
        $s19 = self::mul($a8, $b11, 22) + self::mul($a9, $b10, 22) + self::mul($a10, $b9, 22) +
            self::mul($a11, $b8, 22);
        $s20 = self::mul($a9, $b11, 22) + self::mul($a10, $b10, 22) + self::mul($a11, $b9, 22);
        $s21 = self::mul($a10, $b11, 22) + self::mul($a11, $b10, 22);
        $s22 = self::mul($a11, $b11, 22);
        $s23 = 0;

        //    carry0 = (s0 + (int64_t) (1L << 20)) >> 21;
        //    s1 += carry0;
        //    s0 -= carry0 * ((uint64_t) 1L << 21);
        $carry0 = ($s0 + (1 << 20)) >> 21;
        $s1 += $carry0;
        $s0 -= $carry0 << 21;
        //    carry2 = (s2 + (int64_t) (1L << 20)) >> 21;
        //    s3 += carry2;
        //    s2 -= carry2 * ((uint64_t) 1L << 21);
        $carry2 = ($s2 + (1 << 20)) >> 21;
        $s3 += $carry2;
        $s2 -= $carry2 << 21;
        //    carry4 = (s4 + (int64_t) (1L << 20)) >> 21;
        //    s5 += carry4;
        //    s4 -= carry4 * ((uint64_t) 1L << 21);
        $carry4 = ($s4 + (1 << 20)) >> 21;
        $s5 += $carry4;
        $s4 -= $carry4 << 21;
        //    carry6 = (s6 + (int64_t) (1L << 20)) >> 21;
        //    s7 += carry6;
        //    s6 -= carry6 * ((uint64_t) 1L << 21);
        $carry6 = ($s6 + (1 << 20)) >> 21;
        $s7 += $carry6;
        $s6 -= $carry6 << 21;
        //    carry8 = (s8 + (int64_t) (1L << 20)) >> 21;
        //    s9 += carry8;
        //    s8 -= carry8 * ((uint64_t) 1L << 21);
        $carry8 = ($s8 + (1 << 20)) >> 21;
        $s9 += $carry8;
        $s8 -= $carry8 << 21;
        //    carry10 = (s10 + (int64_t) (1L << 20)) >> 21;
        //    s11 += carry10;
        //    s10 -= carry10 * ((uint64_t) 1L << 21);
        $carry10 = ($s10 + (1 << 20)) >> 21;
        $s11 += $carry10;
        $s10 -= $carry10 << 21;
        //    carry12 = (s12 + (int64_t) (1L << 20)) >> 21;
        //    s13 += carry12;
        //    s12 -= carry12 * ((uint64_t) 1L << 21);
        $carry12 = ($s12 + (1 << 20)) >> 21;
        $s13 += $carry12;
        $s12 -= $carry12 << 21;
        //    carry14 = (s14 + (int64_t) (1L << 20)) >> 21;
        //    s15 += carry14;
        //    s14 -= carry14 * ((uint64_t) 1L << 21);
        $carry14 = ($s14 + (1 << 20)) >> 21;
        $s15 += $carry14;
        $s14 -= $carry14 << 21;
        //    carry16 = (s16 + (int64_t) (1L << 20)) >> 21;
        //    s17 += carry16;
        //    s16 -= carry16 * ((uint64_t) 1L << 21);
        $carry16 = ($s16 + (1 << 20)) >> 21;
        $s17 += $carry16;
        $s16 -= $carry16 << 21;
        //    carry18 = (s18 + (int64_t) (1L << 20)) >> 21;
        //    s19 += carry18;
        //    s18 -= carry18 * ((uint64_t) 1L << 21);
        $carry18 = ($s18 + (1 << 20)) >> 21;
        $s19 += $carry18;
        $s18 -= $carry18 << 21;
        //    carry20 = (s20 + (int64_t) (1L << 20)) >> 21;
        //    s21 += carry20;
        //    s20 -= carry20 * ((uint64_t) 1L << 21);
        $carry20 = ($s20 + (1 << 20)) >> 21;
        $s21 += $carry20;
        $s20 -= $carry20 << 21;
        //    carry22 = (s22 + (int64_t) (1L << 20)) >> 21;
        //    s23 += carry22;
        //    s22 -= carry22 * ((uint64_t) 1L << 21);
        $carry22 = ($s22 + (1 << 20)) >> 21;
        $s23 += $carry22;
        $s22 -= $carry22 << 21;

        //    carry1 = (s1 + (int64_t) (1L << 20)) >> 21;
        //    s2 += carry1;
        //    s1 -= carry1 * ((uint64_t) 1L << 21);
        $carry1 = ($s1 + (1 << 20)) >> 21;
        $s2 += $carry1;
        $s1 -= $carry1 << 21;
        //    carry3 = (s3 + (int64_t) (1L << 20)) >> 21;
        //    s4 += carry3;
        //    s3 -= carry3 * ((uint64_t) 1L << 21);
        $carry3 = ($s3 + (1 << 20)) >> 21;
        $s4 += $carry3;
        $s3 -= $carry3 << 21;
        //    carry5 = (s5 + (int64_t) (1L << 20)) >> 21;
        //    s6 += carry5;
        //    s5 -= carry5 * ((uint64_t) 1L << 21);
        $carry5 = ($s5 + (1 << 20)) >> 21;
        $s6 += $carry5;
        $s5 -= $carry5 << 21;
        //    carry7 = (s7 + (int64_t) (1L << 20)) >> 21;
        //    s8 += carry7;
        //    s7 -= carry7 * ((uint64_t) 1L << 21);
        $carry7 = ($s7 + (1 << 20)) >> 21;
        $s8 += $carry7;
        $s7 -= $carry7 << 21;
        //    carry9 = (s9 + (int64_t) (1L << 20)) >> 21;
        //    s10 += carry9;
        //    s9 -= carry9 * ((uint64_t) 1L << 21);
        $carry9 = ($s9 + (1 << 20)) >> 21;
        $s10 += $carry9;
        $s9 -= $carry9 << 21;
        //    carry11 = (s11 + (int64_t) (1L << 20)) >> 21;
        //    s12 += carry11;
        //    s11 -= carry11 * ((uint64_t) 1L << 21);
        $carry11 = ($s11 + (1 << 20)) >> 21;
        $s12 += $carry11;
        $s11 -= $carry11 << 21;
        //    carry13 = (s13 + (int64_t) (1L << 20)) >> 21;
        //    s14 += carry13;
        //    s13 -= carry13 * ((uint64_t) 1L << 21);
        $carry13 = ($s13 + (1 << 20)) >> 21;
        $s14 += $carry13;
        $s13 -= $carry13 << 21;
        //    carry15 = (s15 + (int64_t) (1L << 20)) >> 21;
        //    s16 += carry15;
        //    s15 -= carry15 * ((uint64_t) 1L << 21);
        $carry15 = ($s15 + (1 << 20)) >> 21;
        $s16 += $carry15;
        $s15 -= $carry15 << 21;
        //    carry17 = (s17 + (int64_t) (1L << 20)) >> 21;
        //    s18 += carry17;
        //    s17 -= carry17 * ((uint64_t) 1L << 21);
        $carry17 = ($s17 + (1 << 20)) >> 21;
        $s18 += $carry17;
        $s17 -= $carry17 << 21;
        //    carry19 = (s19 + (int64_t) (1L << 20)) >> 21;
        //    s20 += carry19;
        //    s19 -= carry19 * ((uint64_t) 1L << 21);
        $carry19 = ($s19 + (1 << 20)) >> 21;
        $s20 += $carry19;
        $s19 -= $carry19 << 21;
        //    carry21 = (s21 + (int64_t) (1L << 20)) >> 21;
        //    s22 += carry21;
        //    s21 -= carry21 * ((uint64_t) 1L << 21);
        $carry21 = ($s21 + (1 << 20)) >> 21;
        $s22 += $carry21;
        $s21 -= $carry21 << 21;

        //    s11 += s23 * 666643;
        //    s12 += s23 * 470296;
        //    s13 += s23 * 654183;
        //    s14 -= s23 * 997805;
        //    s15 += s23 * 136657;
        //    s16 -= s23 * 683901;
        $s11 += self::mul($s23, 666643, 20);
        $s12 += self::mul($s23, 470296, 19);
        $s13 += self::mul($s23, 654183, 20);
        $s14 -= self::mul($s23, 997805, 20);
        $s15 += self::mul($s23, 136657, 18);
        $s16 -= self::mul($s23, 683901, 20);

        //    s10 += s22 * 666643;
        //    s11 += s22 * 470296;
        //    s12 += s22 * 654183;
        //    s13 -= s22 * 997805;
        //    s14 += s22 * 136657;
        //    s15 -= s22 * 683901;
        $s10 += self::mul($s22, 666643, 20);
        $s11 += self::mul($s22, 470296, 19);
        $s12 += self::mul($s22, 654183, 20);
        $s13 -= self::mul($s22, 997805, 20);
        $s14 += self::mul($s22, 136657, 18);
        $s15 -= self::mul($s22, 683901, 20);

        //    s9 += s21 * 666643;
        //    s10 += s21 * 470296;
        //    s11 += s21 * 654183;
        //    s12 -= s21 * 997805;
        //    s13 += s21 * 136657;
        //    s14 -= s21 * 683901;
        $s9 += self::mul($s21, 666643, 20);
        $s10 += self::mul($s21, 470296, 19);
        $s11 += self::mul($s21, 654183, 20);
        $s12 -= self::mul($s21, 997805, 20);
        $s13 += self::mul($s21, 136657, 18);
        $s14 -= self::mul($s21, 683901, 20);

        //    s8 += s20 * 666643;
        //    s9 += s20 * 470296;
        //    s10 += s20 * 654183;
        //    s11 -= s20 * 997805;
        //    s12 += s20 * 136657;
        //    s13 -= s20 * 683901;
        $s8 += self::mul($s20, 666643, 20);
        $s9 += self::mul($s20, 470296, 19);
        $s10 += self::mul($s20, 654183, 20);
        $s11 -= self::mul($s20, 997805, 20);
        $s12 += self::mul($s20, 136657, 18);
        $s13 -= self::mul($s20, 683901, 20);

        //    s7 += s19 * 666643;
        //    s8 += s19 * 470296;
        //    s9 += s19 * 654183;
        //    s10 -= s19 * 997805;
        //    s11 += s19 * 136657;
        //    s12 -= s19 * 683901;
        $s7 += self::mul($s19, 666643, 20);
        $s8 += self::mul($s19, 470296, 19);
        $s9 += self::mul($s19, 654183, 20);
        $s10 -= self::mul($s19, 997805, 20);
        $s11 += self::mul($s19, 136657, 18);
        $s12 -= self::mul($s19, 683901, 20);

        //    s6 += s18 * 666643;
        //    s7 += s18 * 470296;
        //    s8 += s18 * 654183;
        //    s9 -= s18 * 997805;
        //    s10 += s18 * 136657;
        //    s11 -= s18 * 683901;
        $s6 += self::mul($s18, 666643, 20);
        $s7 += self::mul($s18, 470296, 19);
        $s8 += self::mul($s18, 654183, 20);
        $s9 -= self::mul($s18, 997805, 20);
        $s10 += self::mul($s18, 136657, 18);
        $s11 -= self::mul($s18, 683901, 20);

        //    carry6 = (s6 + (int64_t) (1L << 20)) >> 21;
        //    s7 += carry6;
        //    s6 -= carry6 * ((uint64_t) 1L << 21);
        $carry6 = ($s6 + (1 << 20)) >> 21;
        $s7 += $carry6;
        $s6 -= $carry6 << 21;
        //    carry8 = (s8 + (int64_t) (1L << 20)) >> 21;
        //    s9 += carry8;
        //    s8 -= carry8 * ((uint64_t) 1L << 21);
        $carry8 = ($s8 + (1 << 20)) >> 21;
        $s9 += $carry8;
        $s8 -= $carry8 << 21;
        //    carry10 = (s10 + (int64_t) (1L << 20)) >> 21;
        //    s11 += carry10;
        //    s10 -= carry10 * ((uint64_t) 1L << 21);
        $carry10 = ($s10 + (1 << 20)) >> 21;
        $s11 += $carry10;
        $s10 -= $carry10 << 21;
        //    carry12 = (s12 + (int64_t) (1L << 20)) >> 21;
        //    s13 += carry12;
        //    s12 -= carry12 * ((uint64_t) 1L << 21);
        $carry12 = ($s12 + (1 << 20)) >> 21;
        $s13 += $carry12;
        $s12 -= $carry12 << 21;
        //    carry14 = (s14 + (int64_t) (1L << 20)) >> 21;
        //    s15 += carry14;
        //    s14 -= carry14 * ((uint64_t) 1L << 21);
        $carry14 = ($s14 + (1 << 20)) >> 21;
        $s15 += $carry14;
        $s14 -= $carry14 << 21;
        //    carry16 = (s16 + (int64_t) (1L << 20)) >> 21;
        //    s17 += carry16;
        //    s16 -= carry16 * ((uint64_t) 1L << 21);
        $carry16 = ($s16 + (1 << 20)) >> 21;
        $s17 += $carry16;
        $s16 -= $carry16 << 21;

        //    carry7 = (s7 + (int64_t) (1L << 20)) >> 21;
        //    s8 += carry7;
        //    s7 -= carry7 * ((uint64_t) 1L << 21);
        $carry7 = ($s7 + (1 << 20)) >> 21;
        $s8 += $carry7;
        $s7 -= $carry7 << 21;
        //    carry9 = (s9 + (int64_t) (1L << 20)) >> 21;
        //    s10 += carry9;
        //    s9 -= carry9 * ((uint64_t) 1L << 21);
        $carry9 = ($s9 + (1 << 20)) >> 21;
        $s10 += $carry9;
        $s9 -= $carry9 << 21;
        //    carry11 = (s11 + (int64_t) (1L << 20)) >> 21;
        //    s12 += carry11;
        //    s11 -= carry11 * ((uint64_t) 1L << 21);
        $carry11 = ($s11 + (1 << 20)) >> 21;
        $s12 += $carry11;
        $s11 -= $carry11 << 21;
        //    carry13 = (s13 + (int64_t) (1L << 20)) >> 21;
        //    s14 += carry13;
        //    s13 -= carry13 * ((uint64_t) 1L << 21);
        $carry13 = ($s13 + (1 << 20)) >> 21;
        $s14 += $carry13;
        $s13 -= $carry13 << 21;
        //    carry15 = (s15 + (int64_t) (1L << 20)) >> 21;
        //    s16 += carry15;
        //    s15 -= carry15 * ((uint64_t) 1L << 21);
        $carry15 = ($s15 + (1 << 20)) >> 21;
        $s16 += $carry15;
        $s15 -= $carry15 << 21;

        //    s5 += s17 * 666643;
        //    s6 += s17 * 470296;
        //    s7 += s17 * 654183;
        //    s8 -= s17 * 997805;
        //    s9 += s17 * 136657;
        //    s10 -= s17 * 683901;
        $s5 += self::mul($s17, 666643, 20);
        $s6 += self::mul($s17, 470296, 19);
        $s7 += self::mul($s17, 654183, 20);
        $s8 -= self::mul($s17, 997805, 20);
        $s9 += self::mul($s17, 136657, 18);
        $s10 -= self::mul($s17, 683901, 20);

        //    s4 += s16 * 666643;
        //    s5 += s16 * 470296;
        //    s6 += s16 * 654183;
        //    s7 -= s16 * 997805;
        //    s8 += s16 * 136657;
        //    s9 -= s16 * 683901;
        $s4 += self::mul($s16, 666643, 20);
        $s5 += self::mul($s16, 470296, 19);
        $s6 += self::mul($s16, 654183, 20);
        $s7 -= self::mul($s16, 997805, 20);
        $s8 += self::mul($s16, 136657, 18);
        $s9 -= self::mul($s16, 683901, 20);

        //    s3 += s15 * 666643;
        //    s4 += s15 * 470296;
        //    s5 += s15 * 654183;
        //    s6 -= s15 * 997805;
        //    s7 += s15 * 136657;
        //    s8 -= s15 * 683901;
        $s3 += self::mul($s15, 666643, 20);
        $s4 += self::mul($s15, 470296, 19);
        $s5 += self::mul($s15, 654183, 20);
        $s6 -= self::mul($s15, 997805, 20);
        $s7 += self::mul($s15, 136657, 18);
        $s8 -= self::mul($s15, 683901, 20);

        //    s2 += s14 * 666643;
        //    s3 += s14 * 470296;
        //    s4 += s14 * 654183;
        //    s5 -= s14 * 997805;
        //    s6 += s14 * 136657;
        //    s7 -= s14 * 683901;
        $s2 += self::mul($s14, 666643, 20);
        $s3 += self::mul($s14, 470296, 19);
        $s4 += self::mul($s14, 654183, 20);
        $s5 -= self::mul($s14, 997805, 20);
        $s6 += self::mul($s14, 136657, 18);
        $s7 -= self::mul($s14, 683901, 20);

        //    s1 += s13 * 666643;
        //    s2 += s13 * 470296;
        //    s3 += s13 * 654183;
        //    s4 -= s13 * 997805;
        //    s5 += s13 * 136657;
        //    s6 -= s13 * 683901;
        $s1 += self::mul($s13, 666643, 20);
        $s2 += self::mul($s13, 470296, 19);
        $s3 += self::mul($s13, 654183, 20);
        $s4 -= self::mul($s13, 997805, 20);
        $s5 += self::mul($s13, 136657, 18);
        $s6 -= self::mul($s13, 683901, 20);

        //    s0 += s12 * 666643;
        //    s1 += s12 * 470296;
        //    s2 += s12 * 654183;
        //    s3 -= s12 * 997805;
        //    s4 += s12 * 136657;
        //    s5 -= s12 * 683901;
        //    s12 = 0;
        $s0 += self::mul($s12, 666643, 20);
        $s1 += self::mul($s12, 470296, 19);
        $s2 += self::mul($s12, 654183, 20);
        $s3 -= self::mul($s12, 997805, 20);
        $s4 += self::mul($s12, 136657, 18);
        $s5 -= self::mul($s12, 683901, 20);
        $s12 = 0;

        //    carry0 = (s0 + (int64_t) (1L << 20)) >> 21;
        //    s1 += carry0;
        //    s0 -= carry0 * ((uint64_t) 1L << 21);
        $carry0 = ($s0 + (1 << 20)) >> 21;
        $s1 += $carry0;
        $s0 -= $carry0 << 21;
        //    carry2 = (s2 + (int64_t) (1L << 20)) >> 21;
        //    s3 += carry2;
        //    s2 -= carry2 * ((uint64_t) 1L << 21);
        $carry2 = ($s2 + (1 << 20)) >> 21;
        $s3 += $carry2;
        $s2 -= $carry2 << 21;
        //    carry4 = (s4 + (int64_t) (1L << 20)) >> 21;
        //    s5 += carry4;
        //    s4 -= carry4 * ((uint64_t) 1L << 21);
        $carry4 = ($s4 + (1 << 20)) >> 21;
        $s5 += $carry4;
        $s4 -= $carry4 << 21;
        //    carry6 = (s6 + (int64_t) (1L << 20)) >> 21;
        //    s7 += carry6;
        //    s6 -= carry6 * ((uint64_t) 1L << 21);
        $carry6 = ($s6 + (1 << 20)) >> 21;
        $s7 += $carry6;
        $s6 -= $carry6 << 21;
        //    carry8 = (s8 + (int64_t) (1L << 20)) >> 21;
        //    s9 += carry8;
        //    s8 -= carry8 * ((uint64_t) 1L << 21);
        $carry8 = ($s8 + (1 << 20)) >> 21;
        $s9 += $carry8;
        $s8 -= $carry8 << 21;
        //    carry10 = (s10 + (int64_t) (1L << 20)) >> 21;
        //    s11 += carry10;
        //    s10 -= carry10 * ((uint64_t) 1L << 21);
        $carry10 = ($s10 + (1 << 20)) >> 21;
        $s11 += $carry10;
        $s10 -= $carry10 << 21;

        //    carry1 = (s1 + (int64_t) (1L << 20)) >> 21;
        //    s2 += carry1;
        //    s1 -= carry1 * ((uint64_t) 1L << 21);
        $carry1 = ($s1 + (1 << 20)) >> 21;
        $s2 += $carry1;
        $s1 -= $carry1 << 21;
        //    carry3 = (s3 + (int64_t) (1L << 20)) >> 21;
        //    s4 += carry3;
        //    s3 -= carry3 * ((uint64_t) 1L << 21);
        $carry3 = ($s3 + (1 << 20)) >> 21;
        $s4 += $carry3;
        $s3 -= $carry3 << 21;
        //    carry5 = (s5 + (int64_t) (1L << 20)) >> 21;
        //    s6 += carry5;
        //    s5 -= carry5 * ((uint64_t) 1L << 21);
        $carry5 = ($s5 + (1 << 20)) >> 21;
        $s6 += $carry5;
        $s5 -= $carry5 << 21;
        //    carry7 = (s7 + (int64_t) (1L << 20)) >> 21;
        //    s8 += carry7;
        //    s7 -= carry7 * ((uint64_t) 1L << 21);
        $carry7 = ($s7 + (1 << 20)) >> 21;
        $s8 += $carry7;
        $s7 -= $carry7 << 21;
        //    carry9 = (s9 + (int64_t) (1L << 20)) >> 21;
        //    s10 += carry9;
        //    s9 -= carry9 * ((uint64_t) 1L << 21);
        $carry9 = ($s9 + (1 << 20)) >> 21;
        $s10 += $carry9;
        $s9 -= $carry9 << 21;
        //    carry11 = (s11 + (int64_t) (1L << 20)) >> 21;
        //    s12 += carry11;
        //    s11 -= carry11 * ((uint64_t) 1L << 21);
        $carry11 = ($s11 + (1 << 20)) >> 21;
        $s12 += $carry11;
        $s11 -= $carry11 << 21;

        //    s0 += s12 * 666643;
        //    s1 += s12 * 470296;
        //    s2 += s12 * 654183;
        //    s3 -= s12 * 997805;
        //    s4 += s12 * 136657;
        //    s5 -= s12 * 683901;
        //    s12 = 0;
        $s0 += self::mul($s12, 666643, 20);
        $s1 += self::mul($s12, 470296, 19);
        $s2 += self::mul($s12, 654183, 20);
        $s3 -= self::mul($s12, 997805, 20);
        $s4 += self::mul($s12, 136657, 18);
        $s5 -= self::mul($s12, 683901, 20);
        $s12 = 0;

        //    carry0 = s0 >> 21;
        //    s1 += carry0;
        //    s0 -= carry0 * ((uint64_t) 1L << 21);
        $carry0 = $s0 >> 21;
        $s1 += $carry0;
        $s0 -= $carry0 << 21;
        //    carry1 = s1 >> 21;
        //    s2 += carry1;
        //    s1 -= carry1 * ((uint64_t) 1L << 21);
        $carry1 = $s1 >> 21;
        $s2 += $carry1;
        $s1 -= $carry1 << 21;
        //    carry2 = s2 >> 21;
        //    s3 += carry2;
        //    s2 -= carry2 * ((uint64_t) 1L << 21);
        $carry2 = $s2 >> 21;
        $s3 += $carry2;
        $s2 -= $carry2 << 21;
        //    carry3 = s3 >> 21;
        //    s4 += carry3;
        //    s3 -= carry3 * ((uint64_t) 1L << 21);
        $carry3 = $s3 >> 21;
        $s4 += $carry3;
        $s3 -= $carry3 << 21;
        //    carry4 = s4 >> 21;
        //    s5 += carry4;
        //    s4 -= carry4 * ((uint64_t) 1L << 21);
        $carry4 = $s4 >> 21;
        $s5 += $carry4;
        $s4 -= $carry4 << 21;
        //    carry5 = s5 >> 21;
        //    s6 += carry5;
        //    s5 -= carry5 * ((uint64_t) 1L << 21);
        $carry5 = $s5 >> 21;
        $s6 += $carry5;
        $s5 -= $carry5 << 21;
        //    carry6 = s6 >> 21;
        //    s7 += carry6;
        //    s6 -= carry6 * ((uint64_t) 1L << 21);
        $carry6 = $s6 >> 21;
        $s7 += $carry6;
        $s6 -= $carry6 << 21;
        //    carry7 = s7 >> 21;
        //    s8 += carry7;
        //    s7 -= carry7 * ((uint64_t) 1L << 21);
        $carry7 = $s7 >> 21;
        $s8 += $carry7;
        $s7 -= $carry7 << 21;
        //    carry8 = s8 >> 21;
        //    s9 += carry8;
        //    s8 -= carry8 * ((uint64_t) 1L << 21);
        $carry8 = $s8 >> 21;
        $s9 += $carry8;
        $s8 -= $carry8 << 21;
        //    carry9 = s9 >> 21;
        //    s10 += carry9;
        //    s9 -= carry9 * ((uint64_t) 1L << 21);
        $carry9 = $s9 >> 21;
        $s10 += $carry9;
        $s9 -= $carry9 << 21;
        //    carry10 = s10 >> 21;
        //    s11 += carry10;
        //    s10 -= carry10 * ((uint64_t) 1L << 21);
        $carry10 = $s10 >> 21;
        $s11 += $carry10;
        $s10 -= $carry10 << 21;
        //    carry11 = s11 >> 21;
        //    s12 += carry11;
        //    s11 -= carry11 * ((uint64_t) 1L << 21);
        $carry11 = $s11 >> 21;
        $s12 += $carry11;
        $s11 -= $carry11 << 21;

        //    s0 += s12 * 666643;
        //    s1 += s12 * 470296;
        //    s2 += s12 * 654183;
        //    s3 -= s12 * 997805;
        //    s4 += s12 * 136657;
        //    s5 -= s12 * 683901;
        $s0 += self::mul($s12, 666643, 20);
        $s1 += self::mul($s12, 470296, 19);
        $s2 += self::mul($s12, 654183, 20);
        $s3 -= self::mul($s12, 997805, 20);
        $s4 += self::mul($s12, 136657, 18);
        $s5 -= self::mul($s12, 683901, 20);

        //    carry0 = s0 >> 21;
        //    s1 += carry0;
        //    s0 -= carry0 * ((uint64_t) 1L << 21);
        $carry0 = $s0 >> 21;
        $s1 += $carry0;
        $s0 -= $carry0 << 21;
        //    carry1 = s1 >> 21;
        //    s2 += carry1;
        //    s1 -= carry1 * ((uint64_t) 1L << 21);
        $carry1 = $s1 >> 21;
        $s2 += $carry1;
        $s1 -= $carry1 << 21;
        //    carry2 = s2 >> 21;
        //    s3 += carry2;
        //    s2 -= carry2 * ((uint64_t) 1L << 21);
        $carry2 = $s2 >> 21;
        $s3 += $carry2;
        $s2 -= $carry2 << 21;
        //    carry3 = s3 >> 21;
        //    s4 += carry3;
        //    s3 -= carry3 * ((uint64_t) 1L << 21);
        $carry3 = $s3 >> 21;
        $s4 += $carry3;
        $s3 -= $carry3 << 21;
        //    carry4 = s4 >> 21;
        //    s5 += carry4;
        //    s4 -= carry4 * ((uint64_t) 1L << 21);
        $carry4 = $s4 >> 21;
        $s5 += $carry4;
        $s4 -= $carry4 << 21;
        //    carry5 = s5 >> 21;
        //    s6 += carry5;
        //    s5 -= carry5 * ((uint64_t) 1L << 21);
        $carry5 = $s5 >> 21;
        $s6 += $carry5;
        $s5 -= $carry5 << 21;
        //    carry6 = s6 >> 21;
        //    s7 += carry6;
        //    s6 -= carry6 * ((uint64_t) 1L << 21);
        $carry6 = $s6 >> 21;
        $s7 += $carry6;
        $s6 -= $carry6 << 21;
        //    carry7 = s7 >> 21;
        //    s8 += carry7;
        //    s7 -= carry7 * ((uint64_t) 1L << 21);
        $carry7 = $s7 >> 21;
        $s8 += $carry7;
        $s7 -= $carry7 << 21;
        //    carry8 = s8 >> 21;
        //    s9 += carry8;
        //    s8 -= carry8 * ((uint64_t) 1L << 21);
        $carry8 = $s8 >> 21;
        $s9 += $carry8;
        $s8 -= $carry8 << 21;
        //    carry9 = s9 >> 21;
        //    s10 += carry9;
        //    s9 -= carry9 * ((uint64_t) 1L << 21);
        $carry9 = $s9 >> 21;
        $s10 += $carry9;
        $s9 -= $carry9 << 21;
        //    carry10 = s10 >> 21;
        //    s11 += carry10;
        //    s10 -= carry10 * ((uint64_t) 1L << 21);
        $carry10 = $s10 >> 21;
        $s11 += $carry10;
        $s10 -= $carry10 << 21;

        $s = array_fill(0, 32, 0);
        // s[0]  = s0 >> 0;
        $s[0]  = $s0 >> 0;
        // s[1]  = s0 >> 8;
        $s[1]  = $s0 >> 8;
        // s[2]  = (s0 >> 16) | (s1 * ((uint64_t) 1 << 5));
        $s[2]  = ($s0 >> 16) | ($s1 << 5);
        // s[3]  = s1 >> 3;
        $s[3]  = $s1 >> 3;
        // s[4]  = s1 >> 11;
        $s[4]  = $s1 >> 11;
        // s[5]  = (s1 >> 19) | (s2 * ((uint64_t) 1 << 2));
        $s[5]  = ($s1 >> 19) | ($s2 << 2);
        // s[6]  = s2 >> 6;
        $s[6]  = $s2 >> 6;
        // s[7]  = (s2 >> 14) | (s3 * ((uint64_t) 1 << 7));
        $s[7]  = ($s2 >> 14) | ($s3 << 7);
        // s[8]  = s3 >> 1;
        $s[8]  = $s3 >> 1;
        // s[9]  = s3 >> 9;
        $s[9]  = $s3 >> 9;
        // s[10] = (s3 >> 17) | (s4 * ((uint64_t) 1 << 4));
        $s[10] = ($s3 >> 17) | ($s4 << 4);
        // s[11] = s4 >> 4;
        $s[11] = $s4 >> 4;
        // s[12] = s4 >> 12;
        $s[12] = $s4 >> 12;
        // s[13] = (s4 >> 20) | (s5 * ((uint64_t) 1 << 1));
        $s[13] = ($s4 >> 20) | ($s5 << 1);
        // s[14] = s5 >> 7;
        $s[14] = $s5 >> 7;
        // s[15] = (s5 >> 15) | (s6 * ((uint64_t) 1 << 6));
        $s[15] = ($s5 >> 15) | ($s6 << 6);
        // s[16] = s6 >> 2;
        $s[16] = $s6 >> 2;
        // s[17] = s6 >> 10;
        $s[17] = $s6 >> 10;
        // s[18] = (s6 >> 18) | (s7 * ((uint64_t) 1 << 3));
        $s[18] = ($s6 >> 18) | ($s7 << 3);
        // s[19] = s7 >> 5;
        $s[19] = $s7 >> 5;
        // s[20] = s7 >> 13;
        $s[20] = $s7 >> 13;
        // s[21] = s8 >> 0;
        $s[21] = $s8 >> 0;
        // s[22] = s8 >> 8;
        $s[22] = $s8 >> 8;
        // s[23] = (s8 >> 16) | (s9 * ((uint64_t) 1 << 5));
        $s[23] = ($s8 >> 16) | ($s9 << 5);
        // s[24] = s9 >> 3;
        $s[24] = $s9 >> 3;
        // s[25] = s9 >> 11;
        $s[25] = $s9 >> 11;
        // s[26] = (s9 >> 19) | (s10 * ((uint64_t) 1 << 2));
        $s[26] = ($s9 >> 19) | ($s10 << 2);
        // s[27] = s10 >> 6;
        $s[27] = $s10 >> 6;
        // s[28] = (s10 >> 14) | (s11 * ((uint64_t) 1 << 7));
        $s[28] = ($s10 >> 14) | ($s11 << 7);
        // s[29] = s11 >> 1;
        $s[29] = $s11 >> 1;
        // s[30] = s11 >> 9;
        $s[30] = $s11 >> 9;
        // s[31] = s11 >> 17;
        $s[31] = $s11 >> 17;
        return self::intArrayToString($s);
    }

    /**
     * @param string $s
     * @return string
     */
    public static function sc25519_sq($s)
    {
        return self::sc25519_mul($s, $s);
    }

    /**
     * @param string $s
     * @param int $n
     * @param string $a
     * @return string
     */
    public static function sc25519_sqmul($s, $n, $a)
    {
        for ($i = 0; $i < $n; ++$i) {
            $s = self::sc25519_sq($s);
        }
        return self::sc25519_mul($s, $a);
    }

    /**
     * @param string $s
     * @return string
     */
    public static function sc25519_invert($s)
    {
        $_10 = self::sc25519_sq($s);
        $_11 = self::sc25519_mul($s, $_10);
        $_100 = self::sc25519_mul($s, $_11);
        $_1000 = self::sc25519_sq($_100);
        $_1010 = self::sc25519_mul($_10, $_1000);
        $_1011 = self::sc25519_mul($s, $_1010);
        $_10000 = self::sc25519_sq($_1000);
        $_10110 = self::sc25519_sq($_1011);
        $_100000 = self::sc25519_mul($_1010, $_10110);
        $_100110 = self::sc25519_mul($_10000, $_10110);
        $_1000000 = self::sc25519_sq($_100000);
        $_1010000 = self::sc25519_mul($_10000, $_1000000);
        $_1010011 = self::sc25519_mul($_11, $_1010000);
        $_1100011 = self::sc25519_mul($_10000, $_1010011);
        $_1100111 = self::sc25519_mul($_100, $_1100011);
        $_1101011 = self::sc25519_mul($_100, $_1100111);
        $_10010011 = self::sc25519_mul($_1000000, $_1010011);
        $_10010111 = self::sc25519_mul($_100, $_10010011);
        $_10111101 = self::sc25519_mul($_100110, $_10010111);
        $_11010011 = self::sc25519_mul($_10110, $_10111101);
        $_11100111 = self::sc25519_mul($_1010000, $_10010111);
        $_11101011 = self::sc25519_mul($_100, $_11100111);
        $_11110101 = self::sc25519_mul($_1010, $_11101011);

        $recip = self::sc25519_mul($_1011, $_11110101);
        $recip = self::sc25519_sqmul($recip, 126, $_1010011);
        $recip = self::sc25519_sqmul($recip, 9, $_10);
        $recip = self::sc25519_mul($recip, $_11110101);
        $recip = self::sc25519_sqmul($recip, 7, $_1100111);
        $recip = self::sc25519_sqmul($recip, 9, $_11110101);
        $recip = self::sc25519_sqmul($recip, 11, $_10111101);
        $recip = self::sc25519_sqmul($recip, 8, $_11100111);
        $recip = self::sc25519_sqmul($recip, 9, $_1101011);
        $recip = self::sc25519_sqmul($recip, 6, $_1011);
        $recip = self::sc25519_sqmul($recip, 14, $_10010011);
        $recip = self::sc25519_sqmul($recip, 10, $_1100011);
        $recip = self::sc25519_sqmul($recip, 9, $_10010111);
        $recip = self::sc25519_sqmul($recip, 10, $_11110101);
        $recip = self::sc25519_sqmul($recip, 8, $_11010011);
        return self::sc25519_sqmul($recip, 8, $_11101011);
    }

    /**
     * @param string $s
     * @return string
     */
    public static function clamp($s)
    {
        $s_ = self::stringToIntArray($s);
        $s_[0] &= 248;
        $s_[31] |= 64;
        $s_[31] &= 128;
        return self::intArrayToString($s_);
    }

    /**
     * Ensure limbs are less than 28 bits long to prevent float promotion.
     *
     * This uses a constant-time conditional swap under the hood.
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
     * @return ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public static function fe_normalize(ParagonIE_Sodium_Core_Curve25519_Fe $f)
    {
        $x = (PHP_INT_SIZE << 3) - 1; // 31 or 63

        $g = self::fe_copy($f);
        for ($i = 0; $i < 10; ++$i) {
            $mask = -(($g[$i] >> $x) & 1);

            /*
             * Get two candidate normalized values for $g[$i], depending on the sign of $g[$i]:
             */
            $a = $g[$i] & 0x7ffffff;
            $b = -((-$g[$i]) & 0x7ffffff);

            /*
             * Return the appropriate candidate value, based on the sign of the original input:
             *
             * The following is equivalent to this ternary:
             *
             * $g[$i] = (($g[$i] >> $x) & 1) ? $a : $b;
             *
             * Except what's written doesn't contain timing leaks.
             */
            $g[$i] = ($a ^ (($a ^ $b) & $mask));
        }
        return $g;
    }
}
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��X25519.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_X25519', false)) {
    return;
}

/**
 * Class ParagonIE_Sodium_Core_X25519
 */
abstract class ParagonIE_Sodium_Core_X25519 extends ParagonIE_Sodium_Core_Curve25519
{
    /**
     * Alters the objects passed to this method in place.
     *
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $g
     * @param int $b
     * @return void
     * @psalm-suppress MixedAssignment
     */
    public static function fe_cswap(
        ParagonIE_Sodium_Core_Curve25519_Fe $f,
        ParagonIE_Sodium_Core_Curve25519_Fe $g,
        $b = 0
    ) {
        $f0 = (int) $f[0];
        $f1 = (int) $f[1];
        $f2 = (int) $f[2];
        $f3 = (int) $f[3];
        $f4 = (int) $f[4];
        $f5 = (int) $f[5];
        $f6 = (int) $f[6];
        $f7 = (int) $f[7];
        $f8 = (int) $f[8];
        $f9 = (int) $f[9];
        $g0 = (int) $g[0];
        $g1 = (int) $g[1];
        $g2 = (int) $g[2];
        $g3 = (int) $g[3];
        $g4 = (int) $g[4];
        $g5 = (int) $g[5];
        $g6 = (int) $g[6];
        $g7 = (int) $g[7];
        $g8 = (int) $g[8];
        $g9 = (int) $g[9];
        $b = -$b;
        $x0 = ($f0 ^ $g0) & $b;
        $x1 = ($f1 ^ $g1) & $b;
        $x2 = ($f2 ^ $g2) & $b;
        $x3 = ($f3 ^ $g3) & $b;
        $x4 = ($f4 ^ $g4) & $b;
        $x5 = ($f5 ^ $g5) & $b;
        $x6 = ($f6 ^ $g6) & $b;
        $x7 = ($f7 ^ $g7) & $b;
        $x8 = ($f8 ^ $g8) & $b;
        $x9 = ($f9 ^ $g9) & $b;
        $f[0] = $f0 ^ $x0;
        $f[1] = $f1 ^ $x1;
        $f[2] = $f2 ^ $x2;
        $f[3] = $f3 ^ $x3;
        $f[4] = $f4 ^ $x4;
        $f[5] = $f5 ^ $x5;
        $f[6] = $f6 ^ $x6;
        $f[7] = $f7 ^ $x7;
        $f[8] = $f8 ^ $x8;
        $f[9] = $f9 ^ $x9;
        $g[0] = $g0 ^ $x0;
        $g[1] = $g1 ^ $x1;
        $g[2] = $g2 ^ $x2;
        $g[3] = $g3 ^ $x3;
        $g[4] = $g4 ^ $x4;
        $g[5] = $g5 ^ $x5;
        $g[6] = $g6 ^ $x6;
        $g[7] = $g7 ^ $x7;
        $g[8] = $g8 ^ $x8;
        $g[9] = $g9 ^ $x9;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
     * @return ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public static function fe_mul121666(ParagonIE_Sodium_Core_Curve25519_Fe $f)
    {
        $h = array(
            self::mul((int) $f[0], 121666, 17),
            self::mul((int) $f[1], 121666, 17),
            self::mul((int) $f[2], 121666, 17),
            self::mul((int) $f[3], 121666, 17),
            self::mul((int) $f[4], 121666, 17),
            self::mul((int) $f[5], 121666, 17),
            self::mul((int) $f[6], 121666, 17),
            self::mul((int) $f[7], 121666, 17),
            self::mul((int) $f[8], 121666, 17),
            self::mul((int) $f[9], 121666, 17)
        );

        /** @var int $carry9 */
        $carry9 = ($h[9] + (1 << 24)) >> 25;
        $h[0] += self::mul($carry9, 19, 5);
        $h[9] -= $carry9 << 25;
        /** @var int $carry1 */
        $carry1 = ($h[1] + (1 << 24)) >> 25;
        $h[2] += $carry1;
        $h[1] -= $carry1 << 25;
        /** @var int $carry3 */
        $carry3 = ($h[3] + (1 << 24)) >> 25;
        $h[4] += $carry3;
        $h[3] -= $carry3 << 25;
        /** @var int $carry5 */
        $carry5 = ($h[5] + (1 << 24)) >> 25;
        $h[6] += $carry5;
        $h[5] -= $carry5 << 25;
        /** @var int $carry7 */
        $carry7 = ($h[7] + (1 << 24)) >> 25;
        $h[8] += $carry7;
        $h[7] -= $carry7 << 25;

        /** @var int $carry0 */
        $carry0 = ($h[0] + (1 << 25)) >> 26;
        $h[1] += $carry0;
        $h[0] -= $carry0 << 26;
        /** @var int $carry2 */
        $carry2 = ($h[2] + (1 << 25)) >> 26;
        $h[3] += $carry2;
        $h[2] -= $carry2 << 26;
        /** @var int $carry4 */
        $carry4 = ($h[4] + (1 << 25)) >> 26;
        $h[5] += $carry4;
        $h[4] -= $carry4 << 26;
        /** @var int $carry6 */
        $carry6 = ($h[6] + (1 << 25)) >> 26;
        $h[7] += $carry6;
        $h[6] -= $carry6 << 26;
        /** @var int $carry8 */
        $carry8 = ($h[8] + (1 << 25)) >> 26;
        $h[9] += $carry8;
        $h[8] -= $carry8 << 26;

        foreach ($h as $i => $value) {
            $h[$i] = (int) $value;
        }
        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($h);
    }

    /**
     * @internal You should not use this directly from another application
     *
     * Inline comments preceded by # are from libsodium's ref10 code.
     *
     * @param string $n
     * @param string $p
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function crypto_scalarmult_curve25519_ref10($n, $p)
    {
        # for (i = 0;i < 32;++i) e[i] = n[i];
        $e = '' . $n;
        # e[0] &= 248;
        $e[0] = self::intToChr(
            self::chrToInt($e[0]) & 248
        );
        # e[31] &= 127;
        # e[31] |= 64;
        $e[31] = self::intToChr(
            (self::chrToInt($e[31]) & 127) | 64
        );
        # fe_frombytes(x1,p);
        $x1 = self::fe_frombytes($p);
        # fe_1(x2);
        $x2 = self::fe_1();
        # fe_0(z2);
        $z2 = self::fe_0();
        # fe_copy(x3,x1);
        $x3 = self::fe_copy($x1);
        # fe_1(z3);
        $z3 = self::fe_1();

        # swap = 0;
        /** @var int $swap */
        $swap = 0;

        # for (pos = 254;pos >= 0;--pos) {
        for ($pos = 254; $pos >= 0; --$pos) {
            # b = e[pos / 8] >> (pos & 7);
            /** @var int $b */
            $b = self::chrToInt(
                    $e[(int) floor($pos / 8)]
                ) >> ($pos & 7);
            # b &= 1;
            $b &= 1;
            # swap ^= b;
            $swap ^= $b;
            # fe_cswap(x2,x3,swap);
            self::fe_cswap($x2, $x3, $swap);
            # fe_cswap(z2,z3,swap);
            self::fe_cswap($z2, $z3, $swap);
            # swap = b;
            $swap = $b;
            # fe_sub(tmp0,x3,z3);
            $tmp0 = self::fe_sub($x3, $z3);
            # fe_sub(tmp1,x2,z2);
            $tmp1 = self::fe_sub($x2, $z2);

            # fe_add(x2,x2,z2);
            $x2 = self::fe_add($x2, $z2);

            # fe_add(z2,x3,z3);
            $z2 = self::fe_add($x3, $z3);

            # fe_mul(z3,tmp0,x2);
            $z3 = self::fe_mul($tmp0, $x2);

            # fe_mul(z2,z2,tmp1);
            $z2 = self::fe_mul($z2, $tmp1);

            # fe_sq(tmp0,tmp1);
            $tmp0 = self::fe_sq($tmp1);

            # fe_sq(tmp1,x2);
            $tmp1 = self::fe_sq($x2);

            # fe_add(x3,z3,z2);
            $x3 = self::fe_add($z3, $z2);

            # fe_sub(z2,z3,z2);
            $z2 = self::fe_sub($z3, $z2);

            # fe_mul(x2,tmp1,tmp0);
            $x2 = self::fe_mul($tmp1, $tmp0);

            # fe_sub(tmp1,tmp1,tmp0);
            $tmp1 = self::fe_sub($tmp1, $tmp0);

            # fe_sq(z2,z2);
            $z2 = self::fe_sq($z2);

            # fe_mul121666(z3,tmp1);
            $z3 = self::fe_mul121666($tmp1);

            # fe_sq(x3,x3);
            $x3 = self::fe_sq($x3);

            # fe_add(tmp0,tmp0,z3);
            $tmp0 = self::fe_add($tmp0, $z3);

            # fe_mul(z3,x1,z2);
            $z3 = self::fe_mul($x1, $z2);

            # fe_mul(z2,tmp1,tmp0);
            $z2 = self::fe_mul($tmp1, $tmp0);
        }

        # fe_cswap(x2,x3,swap);
        self::fe_cswap($x2, $x3, $swap);

        # fe_cswap(z2,z3,swap);
        self::fe_cswap($z2, $z3, $swap);

        # fe_invert(z2,z2);
        $z2 = self::fe_invert($z2);

        # fe_mul(x2,x2,z2);
        $x2 = self::fe_mul($x2, $z2);
        # fe_tobytes(q,x2);
        return self::fe_tobytes($x2);
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $edwardsY
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $edwardsZ
     * @return ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public static function edwards_to_montgomery(
        ParagonIE_Sodium_Core_Curve25519_Fe $edwardsY,
        ParagonIE_Sodium_Core_Curve25519_Fe $edwardsZ
    ) {
        $tempX = self::fe_add($edwardsZ, $edwardsY);
        $tempZ = self::fe_sub($edwardsZ, $edwardsY);
        $tempZ = self::fe_invert($tempZ);
        return self::fe_mul($tempX, $tempZ);
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $n
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function crypto_scalarmult_curve25519_ref10_base($n)
    {
        # for (i = 0;i < 32;++i) e[i] = n[i];
        $e = '' . $n;

        # e[0] &= 248;
        $e[0] = self::intToChr(
            self::chrToInt($e[0]) & 248
        );

        # e[31] &= 127;
        # e[31] |= 64;
        $e[31] = self::intToChr(
            (self::chrToInt($e[31]) & 127) | 64
        );

        $A = self::ge_scalarmult_base($e);
        if (
            !($A->Y instanceof ParagonIE_Sodium_Core_Curve25519_Fe)
                ||
            !($A->Z instanceof ParagonIE_Sodium_Core_Curve25519_Fe)
        ) {
            throw new TypeError('Null points encountered');
        }
        $pk = self::edwards_to_montgomery($A->Y, $A->Z);
        return self::fe_tobytes($pk);
    }
}
PK�����	�Z=P�����
��HChaCha20.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_HChaCha20', false)) {
    return;
}

/**
 * Class ParagonIE_Sodium_Core_HChaCha20
 */
class ParagonIE_Sodium_Core_HChaCha20 extends ParagonIE_Sodium_Core_ChaCha20
{
    /**
     * @param string $in
     * @param string $key
     * @param string|null $c
     * @return string
     * @throws TypeError
     */
    public static function hChaCha20($in = '', $key = '', $c = null)
    {
        $ctx = array();

        if ($c === null) {
            $ctx[0] = 0x61707865;
            $ctx[1] = 0x3320646e;
            $ctx[2] = 0x79622d32;
            $ctx[3] = 0x6b206574;
        } else {
            $ctx[0] = self::load_4(self::substr($c,  0, 4));
            $ctx[1] = self::load_4(self::substr($c,  4, 4));
            $ctx[2] = self::load_4(self::substr($c,  8, 4));
            $ctx[3] = self::load_4(self::substr($c, 12, 4));
        }
        $ctx[4]  = self::load_4(self::substr($key,  0, 4));
        $ctx[5]  = self::load_4(self::substr($key,  4, 4));
        $ctx[6]  = self::load_4(self::substr($key,  8, 4));
        $ctx[7]  = self::load_4(self::substr($key, 12, 4));
        $ctx[8]  = self::load_4(self::substr($key, 16, 4));
        $ctx[9]  = self::load_4(self::substr($key, 20, 4));
        $ctx[10] = self::load_4(self::substr($key, 24, 4));
        $ctx[11] = self::load_4(self::substr($key, 28, 4));
        $ctx[12] = self::load_4(self::substr($in,   0, 4));
        $ctx[13] = self::load_4(self::substr($in,   4, 4));
        $ctx[14] = self::load_4(self::substr($in,   8, 4));
        $ctx[15] = self::load_4(self::substr($in,  12, 4));
        return self::hChaCha20Bytes($ctx);
    }

    /**
     * @param array $ctx
     * @return string
     * @throws TypeError
     */
    protected static function hChaCha20Bytes(array $ctx)
    {
        $x0  = (int) $ctx[0];
        $x1  = (int) $ctx[1];
        $x2  = (int) $ctx[2];
        $x3  = (int) $ctx[3];
        $x4  = (int) $ctx[4];
        $x5  = (int) $ctx[5];
        $x6  = (int) $ctx[6];
        $x7  = (int) $ctx[7];
        $x8  = (int) $ctx[8];
        $x9  = (int) $ctx[9];
        $x10 = (int) $ctx[10];
        $x11 = (int) $ctx[11];
        $x12 = (int) $ctx[12];
        $x13 = (int) $ctx[13];
        $x14 = (int) $ctx[14];
        $x15 = (int) $ctx[15];

        for ($i = 0; $i < 10; ++$i) {
            # QUARTERROUND( x0,  x4,  x8,  x12)
            list($x0, $x4, $x8, $x12) = self::quarterRound($x0, $x4, $x8, $x12);

            # QUARTERROUND( x1,  x5,  x9,  x13)
            list($x1, $x5, $x9, $x13) = self::quarterRound($x1, $x5, $x9, $x13);

            # QUARTERROUND( x2,  x6,  x10,  x14)
            list($x2, $x6, $x10, $x14) = self::quarterRound($x2, $x6, $x10, $x14);

            # QUARTERROUND( x3,  x7,  x11,  x15)
            list($x3, $x7, $x11, $x15) = self::quarterRound($x3, $x7, $x11, $x15);

            # QUARTERROUND( x0,  x5,  x10,  x15)
            list($x0, $x5, $x10, $x15) = self::quarterRound($x0, $x5, $x10, $x15);

            # QUARTERROUND( x1,  x6,  x11,  x12)
            list($x1, $x6, $x11, $x12) = self::quarterRound($x1, $x6, $x11, $x12);

            # QUARTERROUND( x2,  x7,  x8,  x13)
            list($x2, $x7, $x8, $x13) = self::quarterRound($x2, $x7, $x8, $x13);

            # QUARTERROUND( x3,  x4,  x9,  x14)
            list($x3, $x4, $x9, $x14) = self::quarterRound($x3, $x4, $x9, $x14);
        }

        return self::store32_le((int) ($x0  & 0xffffffff)) .
            self::store32_le((int) ($x1  & 0xffffffff)) .
            self::store32_le((int) ($x2  & 0xffffffff)) .
            self::store32_le((int) ($x3  & 0xffffffff)) .
            self::store32_le((int) ($x12 & 0xffffffff)) .
            self::store32_le((int) ($x13 & 0xffffffff)) .
            self::store32_le((int) ($x14 & 0xffffffff)) .
            self::store32_le((int) ($x15 & 0xffffffff));
    }
}
PK�����	�Z]iu�) ��) ����SipHash.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_SipHash', false)) {
    return;
}

/**
 * Class ParagonIE_SodiumCompat_Core_SipHash
 *
 * Only uses 32-bit arithmetic, while the original SipHash used 64-bit integers
 */
class ParagonIE_Sodium_Core_SipHash extends ParagonIE_Sodium_Core_Util
{
    /**
     * @internal You should not use this directly from another application
     *
     * @param int[] $v
     * @return int[]
     *
     */
    public static function sipRound(array $v)
    {
        # v0 += v1;
        list($v[0], $v[1]) = self::add(
            array($v[0], $v[1]),
            array($v[2], $v[3])
        );

        #  v1=ROTL(v1,13);
        list($v[2], $v[3]) = self::rotl_64((int) $v[2], (int) $v[3], 13);

        #  v1 ^= v0;
        $v[2] = (int) $v[2] ^ (int) $v[0];
        $v[3] = (int) $v[3] ^ (int) $v[1];

        #  v0=ROTL(v0,32);
        list($v[0], $v[1]) = self::rotl_64((int) $v[0], (int) $v[1], 32);

        # v2 += v3;
        list($v[4], $v[5]) = self::add(
            array((int) $v[4], (int) $v[5]),
            array((int) $v[6], (int) $v[7])
        );

        # v3=ROTL(v3,16);
        list($v[6], $v[7]) = self::rotl_64((int) $v[6], (int) $v[7], 16);

        #  v3 ^= v2;
        $v[6] = (int) $v[6] ^ (int) $v[4];
        $v[7] = (int) $v[7] ^ (int) $v[5];

        # v0 += v3;
        list($v[0], $v[1]) = self::add(
            array((int) $v[0], (int) $v[1]),
            array((int) $v[6], (int) $v[7])
        );

        # v3=ROTL(v3,21);
        list($v[6], $v[7]) = self::rotl_64((int) $v[6], (int) $v[7], 21);

        # v3 ^= v0;
        $v[6] = (int) $v[6] ^ (int) $v[0];
        $v[7] = (int) $v[7] ^ (int) $v[1];

        # v2 += v1;
        list($v[4], $v[5]) = self::add(
            array((int) $v[4], (int) $v[5]),
            array((int) $v[2], (int) $v[3])
        );

        # v1=ROTL(v1,17);
        list($v[2], $v[3]) = self::rotl_64((int) $v[2], (int) $v[3], 17);

        #  v1 ^= v2;;
        $v[2] = (int) $v[2] ^ (int) $v[4];
        $v[3] = (int) $v[3] ^ (int) $v[5];

        # v2=ROTL(v2,32)
        list($v[4], $v[5]) = self::rotl_64((int) $v[4], (int) $v[5], 32);

        return $v;
    }

    /**
     * Add two 32 bit integers representing a 64-bit integer.
     *
     * @internal You should not use this directly from another application
     *
     * @param int[] $a
     * @param int[] $b
     * @return array<int, mixed>
     */
    public static function add(array $a, array $b)
    {
        /** @var int $x1 */
        $x1 = $a[1] + $b[1];
        /** @var int $c */
        $c = $x1 >> 32; // Carry if ($a + $b) > 0xffffffff
        /** @var int $x0 */
        $x0 = $a[0] + $b[0] + $c;
        return array(
            $x0 & 0xffffffff,
            $x1 & 0xffffffff
        );
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param int $int0
     * @param int $int1
     * @param int $c
     * @return array<int, mixed>
     */
    public static function rotl_64($int0, $int1, $c)
    {
        $int0 &= 0xffffffff;
        $int1 &= 0xffffffff;
        $c &= 63;
        if ($c === 32) {
            return array($int1, $int0);
        }
        if ($c > 31) {
            $tmp = $int1;
            $int1 = $int0;
            $int0 = $tmp;
            $c &= 31;
        }
        if ($c === 0) {
            return array($int0, $int1);
        }
        return array(
            0xffffffff & (
                ($int0 << $c)
                    |
                ($int1 >> (32 - $c))
            ),
            0xffffffff & (
                ($int1 << $c)
                    |
                ($int0 >> (32 - $c))
            ),
        );
    }

    /**
     * Implements Siphash-2-4 using only 32-bit numbers.
     *
     * When we split an int into two, the higher bits go to the lower index.
     * e.g. 0xDEADBEEFAB10C92D becomes [
     *     0 => 0xDEADBEEF,
     *     1 => 0xAB10C92D
     * ].
     *
     * @internal You should not use this directly from another application
     *
     * @param string $in
     * @param string $key
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function sipHash24($in, $key)
    {
        $inlen = self::strlen($in);

        # /* "somepseudorandomlygeneratedbytes" */
        # u64 v0 = 0x736f6d6570736575ULL;
        # u64 v1 = 0x646f72616e646f6dULL;
        # u64 v2 = 0x6c7967656e657261ULL;
        # u64 v3 = 0x7465646279746573ULL;
        $v = array(
            0x736f6d65, // 0
            0x70736575, // 1
            0x646f7261, // 2
            0x6e646f6d, // 3
            0x6c796765, // 4
            0x6e657261, // 5
            0x74656462, // 6
            0x79746573  // 7
        );
        // v0 => $v[0], $v[1]
        // v1 => $v[2], $v[3]
        // v2 => $v[4], $v[5]
        // v3 => $v[6], $v[7]

        # u64 k0 = LOAD64_LE( k );
        # u64 k1 = LOAD64_LE( k + 8 );
        $k = array(
            self::load_4(self::substr($key, 4, 4)),
            self::load_4(self::substr($key, 0, 4)),
            self::load_4(self::substr($key, 12, 4)),
            self::load_4(self::substr($key, 8, 4))
        );
        // k0 => $k[0], $k[1]
        // k1 => $k[2], $k[3]

        # b = ( ( u64 )inlen ) << 56;
        $b = array(
            $inlen << 24,
            0
        );
        // See docblock for why the 0th index gets the higher bits.

        # v3 ^= k1;
        $v[6] ^= $k[2];
        $v[7] ^= $k[3];
        # v2 ^= k0;
        $v[4] ^= $k[0];
        $v[5] ^= $k[1];
        # v1 ^= k1;
        $v[2] ^= $k[2];
        $v[3] ^= $k[3];
        # v0 ^= k0;
        $v[0] ^= $k[0];
        $v[1] ^= $k[1];

        $left = $inlen;
        # for ( ; in != end; in += 8 )
        while ($left >= 8) {
            # m = LOAD64_LE( in );
            $m = array(
                self::load_4(self::substr($in, 4, 4)),
                self::load_4(self::substr($in, 0, 4))
            );

            # v3 ^= m;
            $v[6] ^= $m[0];
            $v[7] ^= $m[1];

            # SIPROUND;
            # SIPROUND;
            $v = self::sipRound($v);
            $v = self::sipRound($v);

            # v0 ^= m;
            $v[0] ^= $m[0];
            $v[1] ^= $m[1];

            $in = self::substr($in, 8);
            $left -= 8;
        }

        # switch( left )
        #  {
        #     case 7: b |= ( ( u64 )in[ 6] )  << 48;
        #     case 6: b |= ( ( u64 )in[ 5] )  << 40;
        #     case 5: b |= ( ( u64 )in[ 4] )  << 32;
        #     case 4: b |= ( ( u64 )in[ 3] )  << 24;
        #     case 3: b |= ( ( u64 )in[ 2] )  << 16;
        #     case 2: b |= ( ( u64 )in[ 1] )  <<  8;
        #     case 1: b |= ( ( u64 )in[ 0] ); break;
        #     case 0: break;
        # }
        switch ($left) {
            case 7:
                $b[0] |= self::chrToInt($in[6]) << 16;
            case 6:
                $b[0] |= self::chrToInt($in[5]) << 8;
            case 5:
                $b[0] |= self::chrToInt($in[4]);
            case 4:
                $b[1] |= self::chrToInt($in[3]) << 24;
            case 3:
                $b[1] |= self::chrToInt($in[2]) << 16;
            case 2:
                $b[1] |= self::chrToInt($in[1]) << 8;
            case 1:
                $b[1] |= self::chrToInt($in[0]);
            case 0:
                break;
        }
        // See docblock for why the 0th index gets the higher bits.

        # v3 ^= b;
        $v[6] ^= $b[0];
        $v[7] ^= $b[1];

        # SIPROUND;
        # SIPROUND;
        $v = self::sipRound($v);
        $v = self::sipRound($v);

        # v0 ^= b;
        $v[0] ^= $b[0];
        $v[1] ^= $b[1];

        // Flip the lower 8 bits of v2 which is ($v[4], $v[5]) in our implementation
        # v2 ^= 0xff;
        $v[5] ^= 0xff;

        # SIPROUND;
        # SIPROUND;
        # SIPROUND;
        # SIPROUND;
        $v = self::sipRound($v);
        $v = self::sipRound($v);
        $v = self::sipRound($v);
        $v = self::sipRound($v);

        # b = v0 ^ v1 ^ v2 ^ v3;
        # STORE64_LE( out, b );
        return  self::store32_le($v[1] ^ $v[3] ^ $v[5] ^ $v[7]) .
            self::store32_le($v[0] ^ $v[2] ^ $v[4] ^ $v[6]);
    }
}
PK�����	�Ze���^���^����BLAKE2b.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_BLAKE2b', false)) {
    return;
}

/**
 * Class ParagonIE_Sodium_Core_BLAKE2b
 *
 * Based on the work of Devi Mandiri in devi/salt.
 */
abstract class ParagonIE_Sodium_Core_BLAKE2b extends ParagonIE_Sodium_Core_Util
{
    /**
     * @var SplFixedArray
     */
    protected static $iv;

    /**
     * @var array<int, array<int, int>>
     */
    protected static $sigma = array(
        array(  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15),
        array( 14, 10,  4,  8,  9, 15, 13,  6,  1, 12,  0,  2, 11,  7,  5,  3),
        array( 11,  8, 12,  0,  5,  2, 15, 13, 10, 14,  3,  6,  7,  1,  9,  4),
        array(  7,  9,  3,  1, 13, 12, 11, 14,  2,  6,  5, 10,  4,  0, 15,  8),
        array(  9,  0,  5,  7,  2,  4, 10, 15, 14,  1, 11, 12,  6,  8,  3, 13),
        array(  2, 12,  6, 10,  0, 11,  8,  3,  4, 13,  7,  5, 15, 14,  1,  9),
        array( 12,  5,  1, 15, 14, 13,  4, 10,  0,  7,  6,  3,  9,  2,  8, 11),
        array( 13, 11,  7, 14, 12,  1,  3,  9,  5,  0, 15,  4,  8,  6,  2, 10),
        array(  6, 15, 14,  9, 11,  3,  0,  8, 12,  2, 13,  7,  1,  4, 10,  5),
        array( 10,  2,  8,  4,  7,  6,  1,  5, 15, 11,  9, 14,  3, 12, 13 , 0),
        array(  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15),
        array( 14, 10,  4,  8,  9, 15, 13,  6,  1, 12,  0,  2, 11,  7,  5,  3)
    );

    const BLOCKBYTES = 128;
    const OUTBYTES   = 64;
    const KEYBYTES   = 64;

    /**
     * Turn two 32-bit integers into a fixed array representing a 64-bit integer.
     *
     * @internal You should not use this directly from another application
     *
     * @param int $high
     * @param int $low
     * @return SplFixedArray
     * @psalm-suppress MixedAssignment
     */
    public static function new64($high, $low)
    {
        if (PHP_INT_SIZE === 4) {
            throw new SodiumException("Error, use 32-bit");
        }
        $i64 = new SplFixedArray(2);
        $i64[0] = $high & 0xffffffff;
        $i64[1] = $low & 0xffffffff;
        return $i64;
    }

    /**
     * Convert an arbitrary number into an SplFixedArray of two 32-bit integers
     * that represents a 64-bit integer.
     *
     * @internal You should not use this directly from another application
     *
     * @param int $num
     * @return SplFixedArray
     */
    protected static function to64($num)
    {
        list($hi, $lo) = self::numericTo64BitInteger($num);
        return self::new64($hi, $lo);
    }

    /**
     * Adds two 64-bit integers together, returning their sum as a SplFixedArray
     * containing two 32-bit integers (representing a 64-bit integer).
     *
     * @internal You should not use this directly from another application
     *
     * @param SplFixedArray $x
     * @param SplFixedArray $y
     * @return SplFixedArray
     * @psalm-suppress MixedArgument
     * @psalm-suppress MixedAssignment
     * @psalm-suppress MixedOperand
     */
    protected static function add64($x, $y)
    {
        if (PHP_INT_SIZE === 4) {
            throw new SodiumException("Error, use 32-bit");
        }
        $l = ($x[1] + $y[1]) & 0xffffffff;
        return self::new64(
            (int) ($x[0] + $y[0] + (
                ($l < $x[1]) ? 1 : 0
            )),
            (int) $l
        );
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param SplFixedArray $x
     * @param SplFixedArray $y
     * @param SplFixedArray $z
     * @return SplFixedArray
     */
    protected static function add364($x, $y, $z)
    {
        return self::add64($x, self::add64($y, $z));
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param SplFixedArray $x
     * @param SplFixedArray $y
     * @return SplFixedArray
     * @throws SodiumException
     * @throws TypeError
     */
    protected static function xor64(SplFixedArray $x, SplFixedArray $y)
    {
        if (PHP_INT_SIZE === 4) {
            throw new SodiumException("Error, use 32-bit");
        }
        if (!is_numeric($x[0])) {
            throw new SodiumException('x[0] is not an integer');
        }
        if (!is_numeric($x[1])) {
            throw new SodiumException('x[1] is not an integer');
        }
        if (!is_numeric($y[0])) {
            throw new SodiumException('y[0] is not an integer');
        }
        if (!is_numeric($y[1])) {
            throw new SodiumException('y[1] is not an integer');
        }
        return self::new64(
            (int) (($x[0] ^ $y[0]) & 0xffffffff),
            (int) (($x[1] ^ $y[1]) & 0xffffffff)
        );
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param SplFixedArray $x
     * @param int $c
     * @return SplFixedArray
     * @psalm-suppress MixedAssignment
     */
    public static function rotr64($x, $c)
    {
        if (PHP_INT_SIZE === 4) {
            throw new SodiumException("Error, use 32-bit");
        }
        if ($c >= 64) {
            $c %= 64;
        }
        if ($c >= 32) {
            /** @var int $tmp */
            $tmp = $x[0];
            $x[0] = $x[1];
            $x[1] = $tmp;
            $c -= 32;
        }
        if ($c === 0) {
            return $x;
        }

        $l0 = 0;
        $c = 64 - $c;

        /** @var int $c */
        if ($c < 32) {
            $h0 = ((int) ($x[0]) << $c) | (
                (
                    (int) ($x[1]) & ((1 << $c) - 1)
                        <<
                    (32 - $c)
                ) >> (32 - $c)
            );
            $l0 = (int) ($x[1]) << $c;
        } else {
            $h0 = (int) ($x[1]) << ($c - 32);
        }

        $h1 = 0;
        $c1 = 64 - $c;

        if ($c1 < 32) {
            $h1 = (int) ($x[0]) >> $c1;
            $l1 = ((int) ($x[1]) >> $c1) | ((int) ($x[0]) & ((1 << $c1) - 1)) << (32 - $c1);
        } else {
            $l1 = (int) ($x[0]) >> ($c1 - 32);
        }

        return self::new64($h0 | $h1, $l0 | $l1);
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param SplFixedArray $x
     * @return int
     * @psalm-suppress MixedOperand
     */
    protected static function flatten64($x)
    {
        return (int) ($x[0] * 4294967296 + $x[1]);
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param SplFixedArray $x
     * @param int $i
     * @return SplFixedArray
     * @psalm-suppress MixedArgument
     * @psalm-suppress MixedArrayOffset
     */
    protected static function load64(SplFixedArray $x, $i)
    {
        /** @var int $l */
        $l = (int) ($x[$i])
             | ((int) ($x[$i+1]) << 8)
             | ((int) ($x[$i+2]) << 16)
             | ((int) ($x[$i+3]) << 24);
        /** @var int $h */
        $h = (int) ($x[$i+4])
             | ((int) ($x[$i+5]) << 8)
             | ((int) ($x[$i+6]) << 16)
             | ((int) ($x[$i+7]) << 24);
        return self::new64($h, $l);
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param SplFixedArray $x
     * @param int $i
     * @param SplFixedArray $u
     * @return void
     * @psalm-suppress MixedAssignment
     */
    protected static function store64(SplFixedArray $x, $i, SplFixedArray $u)
    {
        $maxLength = $x->getSize() - 1;
        for ($j = 0; $j < 8; ++$j) {
            /*
               [0, 1, 2, 3, 4, 5, 6, 7]
                    ... becomes ...
               [0, 0, 0, 0, 1, 1, 1, 1]
            */
            /** @var int $uIdx */
            $uIdx = ((7 - $j) & 4) >> 2;
            $x[$i]   = ((int) ($u[$uIdx]) & 0xff);
            if (++$i > $maxLength) {
                return;
            }
            /** @psalm-suppress MixedOperand */
            $u[$uIdx] >>= 8;
        }
    }

    /**
     * This just sets the $iv static variable.
     *
     * @internal You should not use this directly from another application
     *
     * @return void
     */
    public static function pseudoConstructor()
    {
        static $called = false;
        if ($called) {
            return;
        }
        self::$iv = new SplFixedArray(8);
        self::$iv[0] = self::new64(0x6a09e667, 0xf3bcc908);
        self::$iv[1] = self::new64(0xbb67ae85, 0x84caa73b);
        self::$iv[2] = self::new64(0x3c6ef372, 0xfe94f82b);
        self::$iv[3] = self::new64(0xa54ff53a, 0x5f1d36f1);
        self::$iv[4] = self::new64(0x510e527f, 0xade682d1);
        self::$iv[5] = self::new64(0x9b05688c, 0x2b3e6c1f);
        self::$iv[6] = self::new64(0x1f83d9ab, 0xfb41bd6b);
        self::$iv[7] = self::new64(0x5be0cd19, 0x137e2179);

        $called = true;
    }

    /**
     * Returns a fresh BLAKE2 context.
     *
     * @internal You should not use this directly from another application
     *
     * @return SplFixedArray
     * @psalm-suppress MixedAssignment
     * @psalm-suppress MixedArrayAccess
     * @psalm-suppress MixedArrayAssignment
     */
    protected static function context()
    {
        $ctx    = new SplFixedArray(6);
        $ctx[0] = new SplFixedArray(8);   // h
        $ctx[1] = new SplFixedArray(2);   // t
        $ctx[2] = new SplFixedArray(2);   // f
        $ctx[3] = new SplFixedArray(256); // buf
        $ctx[4] = 0;                      // buflen
        $ctx[5] = 0;                      // last_node (uint8_t)

        for ($i = 8; $i--;) {
            $ctx[0][$i] = self::$iv[$i];
        }
        for ($i = 256; $i--;) {
            $ctx[3][$i] = 0;
        }

        $zero = self::new64(0, 0);
        $ctx[1][0] = $zero;
        $ctx[1][1] = $zero;
        $ctx[2][0] = $zero;
        $ctx[2][1] = $zero;

        return $ctx;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param SplFixedArray $ctx
     * @param SplFixedArray $buf
     * @return void
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     * @psalm-suppress MixedAssignment
     * @psalm-suppress MixedArrayAccess
     * @psalm-suppress MixedArrayAssignment
     * @psalm-suppress MixedArrayOffset
     */
    protected static function compress(SplFixedArray $ctx, SplFixedArray $buf)
    {
        $m = new SplFixedArray(16);
        $v = new SplFixedArray(16);

        for ($i = 16; $i--;) {
            $m[$i] = self::load64($buf, $i << 3);
        }

        for ($i = 8; $i--;) {
            $v[$i] = $ctx[0][$i];
        }

        $v[ 8] = self::$iv[0];
        $v[ 9] = self::$iv[1];
        $v[10] = self::$iv[2];
        $v[11] = self::$iv[3];

        $v[12] = self::xor64($ctx[1][0], self::$iv[4]);
        $v[13] = self::xor64($ctx[1][1], self::$iv[5]);
        $v[14] = self::xor64($ctx[2][0], self::$iv[6]);
        $v[15] = self::xor64($ctx[2][1], self::$iv[7]);

        for ($r = 0; $r < 12; ++$r) {
            $v = self::G($r, 0, 0, 4, 8, 12, $v, $m);
            $v = self::G($r, 1, 1, 5, 9, 13, $v, $m);
            $v = self::G($r, 2, 2, 6, 10, 14, $v, $m);
            $v = self::G($r, 3, 3, 7, 11, 15, $v, $m);
            $v = self::G($r, 4, 0, 5, 10, 15, $v, $m);
            $v = self::G($r, 5, 1, 6, 11, 12, $v, $m);
            $v = self::G($r, 6, 2, 7, 8, 13, $v, $m);
            $v = self::G($r, 7, 3, 4, 9, 14, $v, $m);
        }

        for ($i = 8; $i--;) {
            $ctx[0][$i] = self::xor64(
                $ctx[0][$i], self::xor64($v[$i], $v[$i+8])
            );
        }
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param int $r
     * @param int $i
     * @param int $a
     * @param int $b
     * @param int $c
     * @param int $d
     * @param SplFixedArray $v
     * @param SplFixedArray $m
     * @return SplFixedArray
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     * @psalm-suppress MixedArrayOffset
     */
    public static function G($r, $i, $a, $b, $c, $d, SplFixedArray $v, SplFixedArray $m)
    {
        $v[$a] = self::add364($v[$a], $v[$b], $m[self::$sigma[$r][$i << 1]]);
        $v[$d] = self::rotr64(self::xor64($v[$d], $v[$a]), 32);
        $v[$c] = self::add64($v[$c], $v[$d]);
        $v[$b] = self::rotr64(self::xor64($v[$b], $v[$c]), 24);
        $v[$a] = self::add364($v[$a], $v[$b], $m[self::$sigma[$r][($i << 1) + 1]]);
        $v[$d] = self::rotr64(self::xor64($v[$d], $v[$a]), 16);
        $v[$c] = self::add64($v[$c], $v[$d]);
        $v[$b] = self::rotr64(self::xor64($v[$b], $v[$c]), 63);
        return $v;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param SplFixedArray $ctx
     * @param int $inc
     * @return void
     * @throws SodiumException
     * @psalm-suppress MixedArgument
     * @psalm-suppress MixedArrayAccess
     * @psalm-suppress MixedArrayAssignment
     */
    public static function increment_counter($ctx, $inc)
    {
        if ($inc < 0) {
            throw new SodiumException('Increasing by a negative number makes no sense.');
        }
        $t = self::to64($inc);
        # S->t is $ctx[1] in our implementation

        # S->t[0] = ( uint64_t )( t >> 0 );
        $ctx[1][0] = self::add64($ctx[1][0], $t);

        # S->t[1] += ( S->t[0] < inc );
        if (self::flatten64($ctx[1][0]) < $inc) {
            $ctx[1][1] = self::add64($ctx[1][1], self::to64(1));
        }
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param SplFixedArray $ctx
     * @param SplFixedArray $p
     * @param int $plen
     * @return void
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     * @psalm-suppress MixedAssignment
     * @psalm-suppress MixedArrayAccess
     * @psalm-suppress MixedArrayAssignment
     * @psalm-suppress MixedArrayOffset
     * @psalm-suppress MixedOperand
     */
    public static function update(SplFixedArray $ctx, SplFixedArray $p, $plen)
    {
        self::pseudoConstructor();

        $offset = 0;
        while ($plen > 0) {
            $left = $ctx[4];
            $fill = 256 - $left;

            if ($plen > $fill) {
                # memcpy( S->buf + left, in, fill ); /* Fill buffer */
                for ($i = $fill; $i--;) {
                    $ctx[3][$i + $left] = $p[$i + $offset];
                }

                # S->buflen += fill;
                $ctx[4] += $fill;

                # blake2b_increment_counter( S, BLAKE2B_BLOCKBYTES );
                self::increment_counter($ctx, 128);

                # blake2b_compress( S, S->buf ); /* Compress */
                self::compress($ctx, $ctx[3]);

                # memcpy( S->buf, S->buf + BLAKE2B_BLOCKBYTES, BLAKE2B_BLOCKBYTES ); /* Shift buffer left */
                for ($i = 128; $i--;) {
                    $ctx[3][$i] = $ctx[3][$i + 128];
                }

                # S->buflen -= BLAKE2B_BLOCKBYTES;
                $ctx[4] -= 128;

                # in += fill;
                $offset += $fill;

                # inlen -= fill;
                $plen -= $fill;
            } else {
                for ($i = $plen; $i--;) {
                    $ctx[3][$i + $left] = $p[$i + $offset];
                }
                $ctx[4] += $plen;
                $offset += $plen;
                $plen -= $plen;
            }
        }
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param SplFixedArray $ctx
     * @param SplFixedArray $out
     * @return SplFixedArray
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     * @psalm-suppress MixedAssignment
     * @psalm-suppress MixedArrayAccess
     * @psalm-suppress MixedArrayAssignment
     * @psalm-suppress MixedArrayOffset
     * @psalm-suppress MixedOperand
     */
    public static function finish(SplFixedArray $ctx, SplFixedArray $out)
    {
        self::pseudoConstructor();
        if ($ctx[4] > 128) {
            self::increment_counter($ctx, 128);
            self::compress($ctx, $ctx[3]);
            $ctx[4] -= 128;
            if ($ctx[4] > 128) {
                throw new SodiumException('Failed to assert that buflen <= 128 bytes');
            }
            for ($i = $ctx[4]; $i--;) {
                $ctx[3][$i] = $ctx[3][$i + 128];
            }
        }

        self::increment_counter($ctx, $ctx[4]);
        $ctx[2][0] = self::new64(0xffffffff, 0xffffffff);

        for ($i = 256 - $ctx[4]; $i--;) {
            $ctx[3][$i+$ctx[4]] = 0;
        }

        self::compress($ctx, $ctx[3]);

        $i = (int) (($out->getSize() - 1) / 8);
        for (; $i >= 0; --$i) {
            self::store64($out, $i << 3, $ctx[0][$i]);
        }
        return $out;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param SplFixedArray|null $key
     * @param int $outlen
     * @param SplFixedArray|null $salt
     * @param SplFixedArray|null $personal
     * @return SplFixedArray
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArgument
     * @psalm-suppress MixedAssignment
     * @psalm-suppress MixedArrayAccess
     * @psalm-suppress MixedArrayAssignment
     * @psalm-suppress MixedArrayOffset
     */
    public static function init(
        $key = null,
        $outlen = 64,
        $salt = null,
        $personal = null
    ) {
        self::pseudoConstructor();
        $klen = 0;

        if ($key !== null) {
            if (count($key) > 64) {
                throw new SodiumException('Invalid key size');
            }
            $klen = count($key);
        }

        if ($outlen > 64) {
            throw new SodiumException('Invalid output size');
        }

        $ctx = self::context();

        $p = new SplFixedArray(64);
        // Zero our param buffer...
        for ($i = 64; --$i;) {
            $p[$i] = 0;
        }

        $p[0] = $outlen; // digest_length
        $p[1] = $klen;   // key_length
        $p[2] = 1;       // fanout
        $p[3] = 1;       // depth

        if ($salt instanceof SplFixedArray) {
            // salt: [32] through [47]
            for ($i = 0; $i < 16; ++$i) {
                $p[32 + $i] = (int) $salt[$i];
            }
        }
        if ($personal instanceof SplFixedArray) {
            // personal: [48] through [63]
            for ($i = 0; $i < 16; ++$i) {
                $p[48 + $i] = (int) $personal[$i];
            }
        }

        $ctx[0][0] = self::xor64(
            $ctx[0][0],
            self::load64($p, 0)
        );
        if ($salt instanceof SplFixedArray || $personal instanceof SplFixedArray) {
            // We need to do what blake2b_init_param() does:
            for ($i = 1; $i < 8; ++$i) {
                $ctx[0][$i] = self::xor64(
                    $ctx[0][$i],
                    self::load64($p, $i << 3)
                );
            }
        }

        if ($klen > 0 && $key instanceof SplFixedArray) {
            $block = new SplFixedArray(128);
            for ($i = 128; $i--;) {
                $block[$i] = 0;
            }
            for ($i = $klen; $i--;) {
                $block[$i] = $key[$i];
            }
            self::update($ctx, $block, 128);
            $ctx[4] = 128;
        }

        return $ctx;
    }

    /**
     * Convert a string into an SplFixedArray of integers
     *
     * @internal You should not use this directly from another application
     *
     * @param string $str
     * @return SplFixedArray
     * @psalm-suppress MixedArgumentTypeCoercion
     */
    public static function stringToSplFixedArray($str = '')
    {
        $values = unpack('C*', $str);
        return SplFixedArray::fromArray(array_values($values));
    }

    /**
     * Convert an SplFixedArray of integers into a string
     *
     * @internal You should not use this directly from another application
     *
     * @param SplFixedArray $a
     * @return string
     * @throws TypeError
     */
    public static function SplFixedArrayToString(SplFixedArray $a)
    {
        /**
         * @var array<int, int|string> $arr
         */
        $arr = $a->toArray();
        $c = $a->count();
        array_unshift($arr, str_repeat('C', $c));
        return (string) (call_user_func_array('pack', $arr));
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param SplFixedArray $ctx
     * @return string
     * @throws TypeError
     * @psalm-suppress MixedArgument
     * @psalm-suppress MixedAssignment
     * @psalm-suppress MixedArrayAccess
     * @psalm-suppress MixedArrayAssignment
     * @psalm-suppress MixedArrayOffset
     * @psalm-suppress MixedMethodCall
     */
    public static function contextToString(SplFixedArray $ctx)
    {
        $str = '';
        /** @var array<int, array<int, int>> $ctxA */
        $ctxA = $ctx[0]->toArray();

        # uint64_t h[8];
        for ($i = 0; $i < 8; ++$i) {
            $str .= self::store32_le($ctxA[$i][1]);
            $str .= self::store32_le($ctxA[$i][0]);
        }

        # uint64_t t[2];
        # uint64_t f[2];
        for ($i = 1; $i < 3; ++$i) {
            $ctxA = $ctx[$i]->toArray();
            $str .= self::store32_le($ctxA[0][1]);
            $str .= self::store32_le($ctxA[0][0]);
            $str .= self::store32_le($ctxA[1][1]);
            $str .= self::store32_le($ctxA[1][0]);
        }

        # uint8_t buf[2 * 128];
        $str .= self::SplFixedArrayToString($ctx[3]);

        /** @var int $ctx4 */
        $ctx4 = (int) $ctx[4];

        # size_t buflen;
        $str .= implode('', array(
            self::intToChr($ctx4 & 0xff),
            self::intToChr(($ctx4 >> 8) & 0xff),
            self::intToChr(($ctx4 >> 16) & 0xff),
            self::intToChr(($ctx4 >> 24) & 0xff),
            self::intToChr(($ctx4 >> 32) & 0xff),
            self::intToChr(($ctx4 >> 40) & 0xff),
            self::intToChr(($ctx4 >> 48) & 0xff),
            self::intToChr(($ctx4 >> 56) & 0xff)
        ));
        # uint8_t last_node;
        return $str . self::intToChr($ctx[5]) . str_repeat("\x00", 23);
    }

    /**
     * Creates an SplFixedArray containing other SplFixedArray elements, from
     * a string (compatible with \Sodium\crypto_generichash_{init, update, final})
     *
     * @internal You should not use this directly from another application
     *
     * @param string $string
     * @return SplFixedArray
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress MixedArrayAssignment
     */
    public static function stringToContext($string)
    {
        $ctx = self::context();

        # uint64_t h[8];
        for ($i = 0; $i < 8; ++$i) {
            $ctx[0][$i] = SplFixedArray::fromArray(
                array(
                    self::load_4(
                        self::substr($string, (($i << 3) + 4), 4)
                    ),
                    self::load_4(
                        self::substr($string, (($i << 3) + 0), 4)
                    )
                )
            );
        }

        # uint64_t t[2];
        # uint64_t f[2];
        for ($i = 1; $i < 3; ++$i) {
            $ctx[$i][1] = SplFixedArray::fromArray(
                array(
                    self::load_4(self::substr($string, 76 + (($i - 1) << 4), 4)),
                    self::load_4(self::substr($string, 72 + (($i - 1) << 4), 4))
                )
            );
            $ctx[$i][0] = SplFixedArray::fromArray(
                array(
                    self::load_4(self::substr($string, 68 + (($i - 1) << 4), 4)),
                    self::load_4(self::substr($string, 64 + (($i - 1) << 4), 4))
                )
            );
        }

        # uint8_t buf[2 * 128];
        $ctx[3] = self::stringToSplFixedArray(self::substr($string, 96, 256));

        # uint8_t buf[2 * 128];
        $int = 0;
        for ($i = 0; $i < 8; ++$i) {
            $int |= self::chrToInt($string[352 + $i]) << ($i << 3);
        }
        $ctx[4] = $int;

        return $ctx;
    }
}
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��AES/Block.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_AES_Block', false)) {
    return;
}

/**
 * @internal This should only be used by sodium_compat
 */
class ParagonIE_Sodium_Core_AES_Block extends SplFixedArray
{
    /**
     * @var array<int, int>
     */
    protected $values = array();

    /**
     * @var int
     */
    protected $size;

    /**
     * @param int $size
     */
    public function __construct($size = 8)
    {
        parent::__construct($size);
        $this->size = $size;
        $this->values = array_fill(0, $size, 0);
    }

    /**
     * @return self
     */
    public static function init()
    {
        return new self(8);
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param array<int, int> $array
     * @param bool $save_indexes
     * @return self
     *
     * @psalm-suppress MethodSignatureMismatch
     */
    #[ReturnTypeWillChange]
    public static function fromArray($array, $save_indexes = null)
    {
        $count = count($array);
        if ($save_indexes) {
            $keys = array_keys($array);
        } else {
            $keys = range(0, $count - 1);
        }
        $array = array_values($array);
        /** @var array<int, int> $keys */

        $obj = new ParagonIE_Sodium_Core_AES_Block();
        if ($save_indexes) {
            for ($i = 0; $i < $count; ++$i) {
                $obj->offsetSet($keys[$i], $array[$i]);
            }
        } else {
            for ($i = 0; $i < $count; ++$i) {
                $obj->offsetSet($i, $array[$i]);
            }
        }
        return $obj;
    }


    /**
     * @internal You should not use this directly from another application
     *
     * @param int|null $offset
     * @param int $value
     * @return void
     *
     * @psalm-suppress MethodSignatureMismatch
     * @psalm-suppress MixedArrayOffset
     */
    #[ReturnTypeWillChange]
    public function offsetSet($offset, $value)
    {
        if (!is_int($value)) {
            throw new InvalidArgumentException('Expected an integer');
        }
        if (is_null($offset)) {
            $this->values[] = $value;
        } else {
            $this->values[$offset] = $value;
        }
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param int $offset
     * @return bool
     *
     * @psalm-suppress MethodSignatureMismatch
     * @psalm-suppress MixedArrayOffset
     */
    #[ReturnTypeWillChange]
    public function offsetExists($offset)
    {
        return isset($this->values[$offset]);
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param int $offset
     * @return void
     *
     * @psalm-suppress MethodSignatureMismatch
     * @psalm-suppress MixedArrayOffset
     */
    #[ReturnTypeWillChange]
    public function offsetUnset($offset)
    {
        unset($this->values[$offset]);
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param int $offset
     * @return int
     *
     * @psalm-suppress MethodSignatureMismatch
     * @psalm-suppress MixedArrayOffset
     */
    #[ReturnTypeWillChange]
    public function offsetGet($offset)
    {
        if (!isset($this->values[$offset])) {
            $this->values[$offset] = 0;
        }
        return (int) ($this->values[$offset]);
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @return array
     */
    public function __debugInfo()
    {
        $out = array();
        foreach ($this->values as $v) {
            $out[] = str_pad(dechex($v), 8, '0', STR_PAD_LEFT);
        }
        return array(implode(', ', $out));
        /*
         return array(implode(', ', $this->values));
         */
    }

    /**
     * @param int $cl low bit mask
     * @param int $ch high bit mask
     * @param int $s shift
     * @param int $x index 1
     * @param int $y index 2
     * @return self
     */
    public function swapN($cl, $ch, $s, $x, $y)
    {
        static $u32mask = ParagonIE_Sodium_Core_Util::U32_MAX;
        $a = $this->values[$x] & $u32mask;
        $b = $this->values[$y] & $u32mask;
        // (x) = (a & cl) | ((b & cl) << (s));
        $this->values[$x] = ($a & $cl) | ((($b & $cl) << $s) & $u32mask);
        // (y) = ((a & ch) >> (s)) | (b & ch);
        $this->values[$y] = ((($a & $ch) & $u32mask) >> $s) | ($b & $ch);
        return $this;
    }

    /**
     * @param int $x index 1
     * @param int $y index 2
     * @return self
     */
    public function swap2($x, $y)
    {
        return $this->swapN(0x55555555, 0xAAAAAAAA, 1, $x, $y);
    }

    /**
     * @param int $x index 1
     * @param int $y index 2
     * @return self
     */
    public function swap4($x, $y)
    {
        return $this->swapN(0x33333333, 0xCCCCCCCC, 2, $x, $y);
    }

    /**
     * @param int $x index 1
     * @param int $y index 2
     * @return self
     */
    public function swap8($x, $y)
    {
        return $this->swapN(0x0F0F0F0F, 0xF0F0F0F0, 4, $x, $y);
    }

    /**
     * @return self
     */
    public function orthogonalize()
    {
        return $this
            ->swap2(0, 1)
            ->swap2(2, 3)
            ->swap2(4, 5)
            ->swap2(6, 7)

            ->swap4(0, 2)
            ->swap4(1, 3)
            ->swap4(4, 6)
            ->swap4(5, 7)

            ->swap8(0, 4)
            ->swap8(1, 5)
            ->swap8(2, 6)
            ->swap8(3, 7);
    }

    /**
     * @return self
     */
    public function shiftRows()
    {
        for ($i = 0; $i < 8; ++$i) {
            $x = $this->values[$i] & ParagonIE_Sodium_Core_Util::U32_MAX;
            $this->values[$i] = (
                ($x & 0x000000FF)
                    | (($x & 0x0000FC00) >> 2) | (($x & 0x00000300) << 6)
                    | (($x & 0x00F00000) >> 4) | (($x & 0x000F0000) << 4)
                    | (($x & 0xC0000000) >> 6) | (($x & 0x3F000000) << 2)
            ) & ParagonIE_Sodium_Core_Util::U32_MAX;
        }
        return $this;
    }

    /**
     * @param int $x
     * @return int
     */
    public static function rotr16($x)
    {
        return (($x << 16) & ParagonIE_Sodium_Core_Util::U32_MAX) | ($x >> 16);
    }

    /**
     * @return self
     */
    public function mixColumns()
    {
        $q0 = $this->values[0];
        $q1 = $this->values[1];
        $q2 = $this->values[2];
        $q3 = $this->values[3];
        $q4 = $this->values[4];
        $q5 = $this->values[5];
        $q6 = $this->values[6];
        $q7 = $this->values[7];
        $r0 = (($q0 >> 8) | ($q0 << 24)) & ParagonIE_Sodium_Core_Util::U32_MAX;
        $r1 = (($q1 >> 8) | ($q1 << 24)) & ParagonIE_Sodium_Core_Util::U32_MAX;
        $r2 = (($q2 >> 8) | ($q2 << 24)) & ParagonIE_Sodium_Core_Util::U32_MAX;
        $r3 = (($q3 >> 8) | ($q3 << 24)) & ParagonIE_Sodium_Core_Util::U32_MAX;
        $r4 = (($q4 >> 8) | ($q4 << 24)) & ParagonIE_Sodium_Core_Util::U32_MAX;
        $r5 = (($q5 >> 8) | ($q5 << 24)) & ParagonIE_Sodium_Core_Util::U32_MAX;
        $r6 = (($q6 >> 8) | ($q6 << 24)) & ParagonIE_Sodium_Core_Util::U32_MAX;
        $r7 = (($q7 >> 8) | ($q7 << 24)) & ParagonIE_Sodium_Core_Util::U32_MAX;

        $this->values[0] = $q7 ^ $r7 ^ $r0 ^ self::rotr16($q0 ^ $r0);
        $this->values[1] = $q0 ^ $r0 ^ $q7 ^ $r7 ^ $r1 ^ self::rotr16($q1 ^ $r1);
        $this->values[2] = $q1 ^ $r1 ^ $r2 ^ self::rotr16($q2 ^ $r2);
        $this->values[3] = $q2 ^ $r2 ^ $q7 ^ $r7 ^ $r3 ^ self::rotr16($q3 ^ $r3);
        $this->values[4] = $q3 ^ $r3 ^ $q7 ^ $r7 ^ $r4 ^ self::rotr16($q4 ^ $r4);
        $this->values[5] = $q4 ^ $r4 ^ $r5 ^ self::rotr16($q5 ^ $r5);
        $this->values[6] = $q5 ^ $r5 ^ $r6 ^ self::rotr16($q6 ^ $r6);
        $this->values[7] = $q6 ^ $r6 ^ $r7 ^ self::rotr16($q7 ^ $r7);
        return $this;
    }

    /**
     * @return self
     */
    public function inverseMixColumns()
    {
        $q0 = $this->values[0];
        $q1 = $this->values[1];
        $q2 = $this->values[2];
        $q3 = $this->values[3];
        $q4 = $this->values[4];
        $q5 = $this->values[5];
        $q6 = $this->values[6];
        $q7 = $this->values[7];
        $r0 = (($q0 >> 8) | ($q0 << 24)) & ParagonIE_Sodium_Core_Util::U32_MAX;
        $r1 = (($q1 >> 8) | ($q1 << 24)) & ParagonIE_Sodium_Core_Util::U32_MAX;
        $r2 = (($q2 >> 8) | ($q2 << 24)) & ParagonIE_Sodium_Core_Util::U32_MAX;
        $r3 = (($q3 >> 8) | ($q3 << 24)) & ParagonIE_Sodium_Core_Util::U32_MAX;
        $r4 = (($q4 >> 8) | ($q4 << 24)) & ParagonIE_Sodium_Core_Util::U32_MAX;
        $r5 = (($q5 >> 8) | ($q5 << 24)) & ParagonIE_Sodium_Core_Util::U32_MAX;
        $r6 = (($q6 >> 8) | ($q6 << 24)) & ParagonIE_Sodium_Core_Util::U32_MAX;
        $r7 = (($q7 >> 8) | ($q7 << 24)) & ParagonIE_Sodium_Core_Util::U32_MAX;

        $this->values[0] = $q5 ^ $q6 ^ $q7 ^ $r0 ^ $r5 ^ $r7 ^ self::rotr16($q0 ^ $q5 ^ $q6 ^ $r0 ^ $r5);
        $this->values[1] = $q0 ^ $q5 ^ $r0 ^ $r1 ^ $r5 ^ $r6 ^ $r7 ^ self::rotr16($q1 ^ $q5 ^ $q7 ^ $r1 ^ $r5 ^ $r6);
        $this->values[2] = $q0 ^ $q1 ^ $q6 ^ $r1 ^ $r2 ^ $r6 ^ $r7 ^ self::rotr16($q0 ^ $q2 ^ $q6 ^ $r2 ^ $r6 ^ $r7);
        $this->values[3] = $q0 ^ $q1 ^ $q2 ^ $q5 ^ $q6 ^ $r0 ^ $r2 ^ $r3 ^ $r5 ^ self::rotr16($q0 ^ $q1 ^ $q3 ^ $q5 ^ $q6 ^ $q7 ^ $r0 ^ $r3 ^ $r5 ^ $r7);
        $this->values[4] = $q1 ^ $q2 ^ $q3 ^ $q5 ^ $r1 ^ $r3 ^ $r4 ^ $r5 ^ $r6 ^ $r7 ^ self::rotr16($q1 ^ $q2 ^ $q4 ^ $q5 ^ $q7 ^ $r1 ^ $r4 ^ $r5 ^ $r6);
        $this->values[5] = $q2 ^ $q3 ^ $q4 ^ $q6 ^ $r2 ^ $r4 ^ $r5 ^ $r6 ^ $r7 ^ self::rotr16($q2 ^ $q3 ^ $q5 ^ $q6 ^ $r2 ^ $r5 ^ $r6 ^ $r7);
        $this->values[6] = $q3 ^ $q4 ^ $q5 ^ $q7 ^ $r3 ^ $r5 ^ $r6 ^ $r7 ^ self::rotr16($q3 ^ $q4 ^ $q6 ^ $q7 ^ $r3 ^ $r6 ^ $r7);
        $this->values[7] = $q4 ^ $q5 ^ $q6 ^ $r4 ^ $r6 ^ $r7 ^ self::rotr16($q4 ^ $q5 ^ $q7 ^ $r4 ^ $r7);
        return $this;
    }

    /**
     * @return self
     */
    public function inverseShiftRows()
    {
        for ($i = 0; $i < 8; ++$i) {
            $x = $this->values[$i];
            $this->values[$i] = ParagonIE_Sodium_Core_Util::U32_MAX & (
                ($x & 0x000000FF)
                    | (($x & 0x00003F00) << 2) | (($x & 0x0000C000) >> 6)
                    | (($x & 0x000F0000) << 4) | (($x & 0x00F00000) >> 4)
                    | (($x & 0x03000000) << 6) | (($x & 0xFC000000) >> 2)
            );
        }
        return $this;
    }
}
PK�����	�Z�8ĤY��Y����AES/KeySchedule.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_AES_KeySchedule', false)) {
    return;
}

/**
 * @internal This should only be used by sodium_compat
 */
class ParagonIE_Sodium_Core_AES_KeySchedule
{
    /** @var array<int, int> $skey -- has size 120 */
    protected $skey;

    /** @var bool $expanded */
    protected $expanded = false;

    /** @var int $numRounds */
    private $numRounds;

    /**
     * @param array $skey
     * @param int $numRounds
     */
    public function __construct(array $skey, $numRounds = 10)
    {
        $this->skey = $skey;
        $this->numRounds = $numRounds;
    }

    /**
     * Get a value at an arbitrary index. Mostly used for unit testing.
     *
     * @param int $i
     * @return int
     */
    public function get($i)
    {
        return $this->skey[$i];
    }

    /**
     * @return int
     */
    public function getNumRounds()
    {
        return $this->numRounds;
    }

    /**
     * @param int $offset
     * @return ParagonIE_Sodium_Core_AES_Block
     */
    public function getRoundKey($offset)
    {
        return ParagonIE_Sodium_Core_AES_Block::fromArray(
            array_slice($this->skey, $offset, 8)
        );
    }

    /**
     * Return an expanded key schedule
     *
     * @return ParagonIE_Sodium_Core_AES_Expanded
     */
    public function expand()
    {
        $exp = new ParagonIE_Sodium_Core_AES_Expanded(
            array_fill(0, 120, 0),
            $this->numRounds
        );
        $n = ($exp->numRounds + 1) << 2;
        for ($u = 0, $v = 0; $u < $n; ++$u, $v += 2) {
            $x = $y = $this->skey[$u];
            $x &= 0x55555555;
            $exp->skey[$v] = ($x | ($x << 1)) & ParagonIE_Sodium_Core_Util::U32_MAX;
            $y &= 0xAAAAAAAA;
            $exp->skey[$v + 1] = ($y | ($y >> 1)) & ParagonIE_Sodium_Core_Util::U32_MAX;
        }
        return $exp;
    }
}
PK�����	�Z��0��0����AES/Expanded.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_AES_Expanded', false)) {
    return;
}

/**
 * @internal This should only be used by sodium_compat
 */
class ParagonIE_Sodium_Core_AES_Expanded extends ParagonIE_Sodium_Core_AES_KeySchedule
{
    /** @var bool $expanded */
    protected $expanded = true;
}
PK�����
�Z7��A������AEGIS256.phpnu��[�����������<?php

if (!defined('SODIUM_COMPAT_AEGIS_C0')) {
    define('SODIUM_COMPAT_AEGIS_C0', "\x00\x01\x01\x02\x03\x05\x08\x0d\x15\x22\x37\x59\x90\xe9\x79\x62");
}
if (!defined('SODIUM_COMPAT_AEGIS_C1')) {
    define('SODIUM_COMPAT_AEGIS_C1', "\xdb\x3d\x18\x55\x6d\xc2\x2f\xf1\x20\x11\x31\x42\x73\xb5\x28\xdd");
}

class ParagonIE_Sodium_Core_AEGIS256 extends ParagonIE_Sodium_Core_AES
{
    /**
     * @param string $ct
     * @param string $tag
     * @param string $ad
     * @param string $key
     * @param string $nonce
     * @return string
     * @throws SodiumException
     */
    public static function decrypt($ct, $tag, $ad, $key, $nonce)
    {
        $state = self::init($key, $nonce);

        // ad_blocks = Split(ZeroPad(ad, 128), 128)
        $ad_blocks = (self::strlen($ad) + 15) >> 4;
        // for ai in ad_blocks:
        //     Absorb(ai)
        for ($i = 0; $i < $ad_blocks; ++$i) {
            $ai = self::substr($ad, $i << 4, 16);
            if (self::strlen($ai) < 16) {
                $ai = str_pad($ai, 16, "\0", STR_PAD_RIGHT);
            }
            $state->absorb($ai);
        }

        $msg = '';
        $cn = self::strlen($ct) & 15;
        $ct_blocks = self::strlen($ct) >> 4;
        // ct_blocks = Split(ZeroPad(ct, 128), 128)
        // cn = Tail(ct, |ct| mod 128)
        for ($i = 0; $i < $ct_blocks; ++$i) {
            $msg .= $state->dec(self::substr($ct, $i << 4, 16));
        }
        // if cn is not empty:
        //   msg = msg || DecPartial(cn)
        if ($cn) {
            $start = $ct_blocks << 4;
            $msg .= $state->decPartial(self::substr($ct, $start, $cn));
        }
        $expected_tag = $state->finalize(
            self::strlen($ad) << 3,
            self::strlen($msg) << 3
        );
        if (!self::hashEquals($expected_tag, $tag)) {
            try {
                // The RFC says to erase msg, so we shall try:
                ParagonIE_Sodium_Compat::memzero($msg);
            } catch (SodiumException $ex) {
                // Do nothing if we cannot memzero
            }
            throw new SodiumException('verification failed');
        }
        return $msg;
    }

    /**
     * @param string $msg
     * @param string $ad
     * @param string $key
     * @param string $nonce
     * @return array
     * @throws SodiumException
     */
    public static function encrypt($msg, $ad, $key, $nonce)
    {
        $state = self::init($key, $nonce);
        $ad_len = self::strlen($ad);
        $msg_len = self::strlen($msg);
        $ad_blocks = ($ad_len + 15) >> 4;
        for ($i = 0; $i < $ad_blocks; ++$i) {
            $ai = self::substr($ad, $i << 4, 16);
            if (self::strlen($ai) < 16) {
                $ai = str_pad($ai, 16, "\0", STR_PAD_RIGHT);
            }
            $state->absorb($ai);
        }

        $ct = '';
        $msg_blocks = ($msg_len + 15) >> 4;
        for ($i = 0; $i < $msg_blocks; ++$i) {
            $xi = self::substr($msg, $i << 4, 16);
            if (self::strlen($xi) < 16) {
                $xi = str_pad($xi, 16, "\0", STR_PAD_RIGHT);
            }
            $ct .= $state->enc($xi);
        }
        $tag = $state->finalize(
            $ad_len << 3,
            $msg_len << 3
        );
        return array(
            self::substr($ct, 0, $msg_len),
            $tag
        );

    }

    /**
     * @param string $key
     * @param string $nonce
     * @return ParagonIE_Sodium_Core_AEGIS_State256
     */
    public static function init($key, $nonce)
    {
        return ParagonIE_Sodium_Core_AEGIS_State256::init($key, $nonce);
    }
}
PK�����
�Z���*
��*
��
��XChaCha20.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_XChaCha20', false)) {
    return;
}

/**
 * Class ParagonIE_Sodium_Core_XChaCha20
 */
class ParagonIE_Sodium_Core_XChaCha20 extends ParagonIE_Sodium_Core_HChaCha20
{
    /**
     * @internal You should not use this directly from another application
     *
     * @param int $len
     * @param string $nonce
     * @param string $key
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function stream($len = 64, $nonce = '', $key = '')
    {
        if (self::strlen($nonce) !== 24) {
            throw new SodiumException('Nonce must be 24 bytes long');
        }
        return self::encryptBytes(
            new ParagonIE_Sodium_Core_ChaCha20_Ctx(
                self::hChaCha20(
                    self::substr($nonce, 0, 16),
                    $key
                ),
                self::substr($nonce, 16, 8)
            ),
            str_repeat("\x00", $len)
        );
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param int $len
     * @param string $nonce
     * @param string $key
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function ietfStream($len = 64, $nonce = '', $key = '')
    {
        if (self::strlen($nonce) !== 24) {
            throw new SodiumException('Nonce must be 24 bytes long');
        }
        return self::encryptBytes(
            new ParagonIE_Sodium_Core_ChaCha20_IetfCtx(
                self::hChaCha20(
                    self::substr($nonce, 0, 16),
                    $key
                ),
                "\x00\x00\x00\x00" . self::substr($nonce, 16, 8)
            ),
            str_repeat("\x00", $len)
        );
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $message
     * @param string $nonce
     * @param string $key
     * @param string $ic
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function streamXorIc($message, $nonce = '', $key = '', $ic = '')
    {
        if (self::strlen($nonce) !== 24) {
            throw new SodiumException('Nonce must be 24 bytes long');
        }
        return self::encryptBytes(
            new ParagonIE_Sodium_Core_ChaCha20_Ctx(
                self::hChaCha20(self::substr($nonce, 0, 16), $key),
                self::substr($nonce, 16, 8),
                $ic
            ),
            $message
        );
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $message
     * @param string $nonce
     * @param string $key
     * @param string $ic
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function ietfStreamXorIc($message, $nonce = '', $key = '', $ic = '')
    {
        if (self::strlen($nonce) !== 24) {
            throw new SodiumException('Nonce must be 24 bytes long');
        }
        return self::encryptBytes(
            new ParagonIE_Sodium_Core_ChaCha20_IetfCtx(
                self::hChaCha20(self::substr($nonce, 0, 16), $key),
                "\x00\x00\x00\x00" . self::substr($nonce, 16, 8),
                $ic
            ),
            $message
        );
    }
}
PK�����
�Z�um�LD��LD����Ed25519.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_Ed25519', false)) {
    return;
}
if (!class_exists('ParagonIE_Sodium_Core_Curve25519', false)) {
    require_once dirname(__FILE__) . '/Curve25519.php';
}

/**
 * Class ParagonIE_Sodium_Core_Ed25519
 */
abstract class ParagonIE_Sodium_Core_Ed25519 extends ParagonIE_Sodium_Core_Curve25519
{
    const KEYPAIR_BYTES = 96;
    const SEED_BYTES = 32;
    const SCALAR_BYTES = 32;

    /**
     * @internal You should not use this directly from another application
     *
     * @return string (96 bytes)
     * @throws Exception
     * @throws SodiumException
     * @throws TypeError
     */
    public static function keypair()
    {
        $seed = random_bytes(self::SEED_BYTES);
        $pk = '';
        $sk = '';
        self::seed_keypair($pk, $sk, $seed);
        return $sk . $pk;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $pk
     * @param string $sk
     * @param string $seed
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function seed_keypair(&$pk, &$sk, $seed)
    {
        if (self::strlen($seed) !== self::SEED_BYTES) {
            throw new RangeException('crypto_sign keypair seed must be 32 bytes long');
        }

        /** @var string $pk */
        $pk = self::publickey_from_secretkey($seed);
        $sk = $seed . $pk;
        return $sk;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $keypair
     * @return string
     * @throws TypeError
     */
    public static function secretkey($keypair)
    {
        if (self::strlen($keypair) !== self::KEYPAIR_BYTES) {
            throw new RangeException('crypto_sign keypair must be 96 bytes long');
        }
        return self::substr($keypair, 0, 64);
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $keypair
     * @return string
     * @throws TypeError
     */
    public static function publickey($keypair)
    {
        if (self::strlen($keypair) !== self::KEYPAIR_BYTES) {
            throw new RangeException('crypto_sign keypair must be 96 bytes long');
        }
        return self::substr($keypair, 64, 32);
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $sk
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function publickey_from_secretkey($sk)
    {
        /** @var string $sk */
        $sk = hash('sha512', self::substr($sk, 0, 32), true);
        $sk[0] = self::intToChr(
            self::chrToInt($sk[0]) & 248
        );
        $sk[31] = self::intToChr(
            (self::chrToInt($sk[31]) & 63) | 64
        );
        return self::sk_to_pk($sk);
    }

    /**
     * @param string $pk
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function pk_to_curve25519($pk)
    {
        if (self::small_order($pk)) {
            throw new SodiumException('Public key is on a small order');
        }
        $A = self::ge_frombytes_negate_vartime(self::substr($pk, 0, 32));
        $p1 = self::ge_mul_l($A);
        if (!self::fe_isnonzero($p1->X)) {
            throw new SodiumException('Unexpected zero result');
        }

        # fe_1(one_minus_y);
        # fe_sub(one_minus_y, one_minus_y, A.Y);
        # fe_invert(one_minus_y, one_minus_y);
        $one_minux_y = self::fe_invert(
            self::fe_sub(
                self::fe_1(),
                $A->Y
            )
        );

        # fe_1(x);
        # fe_add(x, x, A.Y);
        # fe_mul(x, x, one_minus_y);
        $x = self::fe_mul(
            self::fe_add(self::fe_1(), $A->Y),
            $one_minux_y
        );

        # fe_tobytes(curve25519_pk, x);
        return self::fe_tobytes($x);
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $sk
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function sk_to_pk($sk)
    {
        return self::ge_p3_tobytes(
            self::ge_scalarmult_base(
                self::substr($sk, 0, 32)
            )
        );
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $message
     * @param string $sk
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function sign($message, $sk)
    {
        /** @var string $signature */
        $signature = self::sign_detached($message, $sk);
        return $signature . $message;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $message A signed message
     * @param string $pk      Public key
     * @return string         Message (without signature)
     * @throws SodiumException
     * @throws TypeError
     */
    public static function sign_open($message, $pk)
    {
        /** @var string $signature */
        $signature = self::substr($message, 0, 64);

        /** @var string $message */
        $message = self::substr($message, 64);

        if (self::verify_detached($signature, $message, $pk)) {
            return $message;
        }
        throw new SodiumException('Invalid signature');
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $message
     * @param string $sk
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function sign_detached($message, $sk)
    {
        # crypto_hash_sha512(az, sk, 32);
        $az =  hash('sha512', self::substr($sk, 0, 32), true);

        # az[0] &= 248;
        # az[31] &= 63;
        # az[31] |= 64;
        $az[0] = self::intToChr(self::chrToInt($az[0]) & 248);
        $az[31] = self::intToChr((self::chrToInt($az[31]) & 63) | 64);

        # crypto_hash_sha512_init(&hs);
        # crypto_hash_sha512_update(&hs, az + 32, 32);
        # crypto_hash_sha512_update(&hs, m, mlen);
        # crypto_hash_sha512_final(&hs, nonce);
        $hs = hash_init('sha512');
        hash_update($hs, self::substr($az, 32, 32));
        hash_update($hs, $message);
        $nonceHash = hash_final($hs, true);

        # memmove(sig + 32, sk + 32, 32);
        $pk = self::substr($sk, 32, 32);

        # sc_reduce(nonce);
        # ge_scalarmult_base(&R, nonce);
        # ge_p3_tobytes(sig, &R);
        $nonce = self::sc_reduce($nonceHash) . self::substr($nonceHash, 32);
        $sig = self::ge_p3_tobytes(
            self::ge_scalarmult_base($nonce)
        );

        # crypto_hash_sha512_init(&hs);
        # crypto_hash_sha512_update(&hs, sig, 64);
        # crypto_hash_sha512_update(&hs, m, mlen);
        # crypto_hash_sha512_final(&hs, hram);
        $hs = hash_init('sha512');
        hash_update($hs, self::substr($sig, 0, 32));
        hash_update($hs, self::substr($pk, 0, 32));
        hash_update($hs, $message);
        $hramHash = hash_final($hs, true);

        # sc_reduce(hram);
        # sc_muladd(sig + 32, hram, az, nonce);
        $hram = self::sc_reduce($hramHash);
        $sigAfter = self::sc_muladd($hram, $az, $nonce);
        $sig = self::substr($sig, 0, 32) . self::substr($sigAfter, 0, 32);

        try {
            ParagonIE_Sodium_Compat::memzero($az);
        } catch (SodiumException $ex) {
            $az = null;
        }
        return $sig;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $sig
     * @param string $message
     * @param string $pk
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     */
    public static function verify_detached($sig, $message, $pk)
    {
        if (self::strlen($sig) < 64) {
            throw new SodiumException('Signature is too short');
        }
        if ((self::chrToInt($sig[63]) & 240) && self::check_S_lt_L(self::substr($sig, 32, 32))) {
            throw new SodiumException('S < L - Invalid signature');
        }
        if (self::small_order($sig)) {
            throw new SodiumException('Signature is on too small of an order');
        }
        if ((self::chrToInt($sig[63]) & 224) !== 0) {
            throw new SodiumException('Invalid signature');
        }
        $d = 0;
        for ($i = 0; $i < 32; ++$i) {
            $d |= self::chrToInt($pk[$i]);
        }
        if ($d === 0) {
            throw new SodiumException('All zero public key');
        }

        /** @var bool The original value of ParagonIE_Sodium_Compat::$fastMult */
        $orig = ParagonIE_Sodium_Compat::$fastMult;

        // Set ParagonIE_Sodium_Compat::$fastMult to true to speed up verification.
        ParagonIE_Sodium_Compat::$fastMult = true;

        /** @var ParagonIE_Sodium_Core_Curve25519_Ge_P3 $A */
        $A = self::ge_frombytes_negate_vartime($pk);

        /** @var string $hDigest */
        $hDigest = hash(
            'sha512',
            self::substr($sig, 0, 32) .
                self::substr($pk, 0, 32) .
                $message,
            true
        );

        /** @var string $h */
        $h = self::sc_reduce($hDigest) . self::substr($hDigest, 32);

        /** @var ParagonIE_Sodium_Core_Curve25519_Ge_P2 $R */
        $R = self::ge_double_scalarmult_vartime(
            $h,
            $A,
            self::substr($sig, 32)
        );

        /** @var string $rcheck */
        $rcheck = self::ge_tobytes($R);

        // Reset ParagonIE_Sodium_Compat::$fastMult to what it was before.
        ParagonIE_Sodium_Compat::$fastMult = $orig;

        return self::verify_32($rcheck, self::substr($sig, 0, 32));
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param string $S
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     */
    public static function check_S_lt_L($S)
    {
        if (self::strlen($S) < 32) {
            throw new SodiumException('Signature must be 32 bytes');
        }
        $L = array(
            0xed, 0xd3, 0xf5, 0x5c, 0x1a, 0x63, 0x12, 0x58,
            0xd6, 0x9c, 0xf7, 0xa2, 0xde, 0xf9, 0xde, 0x14,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10
        );
        $c = 0;
        $n = 1;
        $i = 32;

        /** @var array<int, int> $L */
        do {
            --$i;
            $x = self::chrToInt($S[$i]);
            $c |= (
                (($x - $L[$i]) >> 8) & $n
            );
            $n &= (
                (($x ^ $L[$i]) - 1) >> 8
            );
        } while ($i !== 0);

        return $c === 0;
    }

    /**
     * @param string $R
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     */
    public static function small_order($R)
    {
        /** @var array<int, array<int, int>> $blocklist */
        $blocklist = array(
            /* 0 (order 4) */
            array(
                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
            ),
            /* 1 (order 1) */
            array(
                0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
            ),
            /* 2707385501144840649318225287225658788936804267575313519463743609750303402022 (order 8) */
            array(
                0x26, 0xe8, 0x95, 0x8f, 0xc2, 0xb2, 0x27, 0xb0,
                0x45, 0xc3, 0xf4, 0x89, 0xf2, 0xef, 0x98, 0xf0,
                0xd5, 0xdf, 0xac, 0x05, 0xd3, 0xc6, 0x33, 0x39,
                0xb1, 0x38, 0x02, 0x88, 0x6d, 0x53, 0xfc, 0x05
            ),
            /* 55188659117513257062467267217118295137698188065244968500265048394206261417927 (order 8) */
            array(
                0xc7, 0x17, 0x6a, 0x70, 0x3d, 0x4d, 0xd8, 0x4f,
                0xba, 0x3c, 0x0b, 0x76, 0x0d, 0x10, 0x67, 0x0f,
                0x2a, 0x20, 0x53, 0xfa, 0x2c, 0x39, 0xcc, 0xc6,
                0x4e, 0xc7, 0xfd, 0x77, 0x92, 0xac, 0x03, 0x7a
            ),
            /* p-1 (order 2) */
            array(
                0x13, 0xe8, 0x95, 0x8f, 0xc2, 0xb2, 0x27, 0xb0,
                0x45, 0xc3, 0xf4, 0x89, 0xf2, 0xef, 0x98, 0xf0,
                0xd5, 0xdf, 0xac, 0x05, 0xd3, 0xc6, 0x33, 0x39,
                0xb1, 0x38, 0x02, 0x88, 0x6d, 0x53, 0xfc, 0x85
            ),
            /* p (order 4) */
            array(
                0xb4, 0x17, 0x6a, 0x70, 0x3d, 0x4d, 0xd8, 0x4f,
                0xba, 0x3c, 0x0b, 0x76, 0x0d, 0x10, 0x67, 0x0f,
                0x2a, 0x20, 0x53, 0xfa, 0x2c, 0x39, 0xcc, 0xc6,
                0x4e, 0xc7, 0xfd, 0x77, 0x92, 0xac, 0x03, 0xfa
            ),
            /* p+1 (order 1) */
            array(
                0xec, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f
            ),
            /* p+2707385501144840649318225287225658788936804267575313519463743609750303402022 (order 8) */
            array(
                0xed, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f
            ),
            /* p+55188659117513257062467267217118295137698188065244968500265048394206261417927 (order 8) */
            array(
                0xee, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f
            ),
            /* 2p-1 (order 2) */
            array(
                0xd9, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
            ),
            /* 2p (order 4) */
            array(
                0xda, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
            ),
            /* 2p+1 (order 1) */
            array(
                0xdb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
            )
        );
        /** @var int $countBlocklist */
        $countBlocklist = count($blocklist);

        for ($i = 0; $i < $countBlocklist; ++$i) {
            $c = 0;
            for ($j = 0; $j < 32; ++$j) {
                $c |= self::chrToInt($R[$j]) ^ (int) $blocklist[$i][$j];
            }
            if ($c === 0) {
                return true;
            }
        }
        return false;
    }

    /**
     * @param string $s
     * @return string
     * @throws SodiumException
     */
    public static function scalar_complement($s)
    {
        $t_ = self::L . str_repeat("\x00", 32);
        sodium_increment($t_);
        $s_ = $s . str_repeat("\x00", 32);
        ParagonIE_Sodium_Compat::sub($t_, $s_);
        return self::sc_reduce($t_);
    }

    /**
     * @return string
     * @throws SodiumException
     */
    public static function scalar_random()
    {
        do {
            $r = ParagonIE_Sodium_Compat::randombytes_buf(self::SCALAR_BYTES);
            $r[self::SCALAR_BYTES - 1] = self::intToChr(
                self::chrToInt($r[self::SCALAR_BYTES - 1]) & 0x1f
            );
        } while (
            !self::check_S_lt_L($r) || ParagonIE_Sodium_Compat::is_zero($r)
        );
        return $r;
    }

    /**
     * @param string $s
     * @return string
     * @throws SodiumException
     */
    public static function scalar_negate($s)
    {
        $t_ = self::L . str_repeat("\x00", 32) ;
        $s_ = $s . str_repeat("\x00", 32) ;
        ParagonIE_Sodium_Compat::sub($t_, $s_);
        return self::sc_reduce($t_);
    }

    /**
     * @param string $a
     * @param string $b
     * @return string
     * @throws SodiumException
     */
    public static function scalar_add($a, $b)
    {
        $a_ = $a . str_repeat("\x00", 32);
        $b_ = $b . str_repeat("\x00", 32);
        ParagonIE_Sodium_Compat::add($a_, $b_);
        return self::sc_reduce($a_);
    }

    /**
     * @param string $x
     * @param string $y
     * @return string
     * @throws SodiumException
     */
    public static function scalar_sub($x, $y)
    {
        $yn = self::scalar_negate($y);
        return self::scalar_add($x, $yn);
    }
}
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�Zz-y9T��T��
��AEGIS128L.phpnu��[�����������<?php

if (!defined('SODIUM_COMPAT_AEGIS_C0')) {
    define('SODIUM_COMPAT_AEGIS_C0', "\x00\x01\x01\x02\x03\x05\x08\x0d\x15\x22\x37\x59\x90\xe9\x79\x62");
}
if (!defined('SODIUM_COMPAT_AEGIS_C1')) {
    define('SODIUM_COMPAT_AEGIS_C1', "\xdb\x3d\x18\x55\x6d\xc2\x2f\xf1\x20\x11\x31\x42\x73\xb5\x28\xdd");
}

class ParagonIE_Sodium_Core_AEGIS128L extends ParagonIE_Sodium_Core_AES
{
    /**
     * @param string $ct
     * @param string $tag
     * @param string $ad
     * @param string $key
     * @param string $nonce
     * @return string
     * @throws SodiumException
     */
    public static function decrypt($ct, $tag, $ad, $key, $nonce)
    {
        $state = self::init($key, $nonce);
        $ad_blocks = (self::strlen($ad) + 31) >> 5;
        for ($i = 0; $i < $ad_blocks; ++$i) {
            $ai = self::substr($ad, $i << 5, 32);
            if (self::strlen($ai) < 32) {
                $ai = str_pad($ai, 32, "\0", STR_PAD_RIGHT);
            }
            $state->absorb($ai);
        }

        $msg = '';
        $cn = self::strlen($ct) & 31;
        $ct_blocks = self::strlen($ct) >> 5;
        for ($i = 0; $i < $ct_blocks; ++$i) {
            $msg .= $state->dec(self::substr($ct, $i << 5, 32));
        }
        if ($cn) {
            $start = $ct_blocks << 5;
            $msg .= $state->decPartial(self::substr($ct, $start, $cn));
        }
        $expected_tag = $state->finalize(
            self::strlen($ad) << 3,
            self::strlen($msg) << 3
        );
        if (!self::hashEquals($expected_tag, $tag)) {
            try {
                // The RFC says to erase msg, so we shall try:
                ParagonIE_Sodium_Compat::memzero($msg);
            } catch (SodiumException $ex) {
                // Do nothing if we cannot memzero
            }
            throw new SodiumException('verification failed');
        }
        return $msg;
    }

    /**
     * @param string $msg
     * @param string $ad
     * @param string $key
     * @param string $nonce
     * @return array
     *
     * @throws SodiumException
     */
    public static function encrypt($msg, $ad, $key, $nonce)
    {
        $state = self::init($key, $nonce);
        // ad_blocks = Split(ZeroPad(ad, 256), 256)
        // for ai in ad_blocks:
        //     Absorb(ai)
        $ad_len = self::strlen($ad);
        $msg_len = self::strlen($msg);
        $ad_blocks = ($ad_len + 31) >> 5;
        for ($i = 0; $i < $ad_blocks; ++$i) {
            $ai = self::substr($ad, $i << 5, 32);
            if (self::strlen($ai) < 32) {
                $ai = str_pad($ai, 32, "\0", STR_PAD_RIGHT);
            }
            $state->absorb($ai);
        }

        // msg_blocks = Split(ZeroPad(msg, 256), 256)
        // for xi in msg_blocks:
        //     ct = ct || Enc(xi)
        $ct = '';
        $msg_blocks = ($msg_len + 31) >> 5;
        for ($i = 0; $i < $msg_blocks; ++$i) {
            $xi = self::substr($msg, $i << 5, 32);
            if (self::strlen($xi) < 32) {
                $xi = str_pad($xi, 32, "\0", STR_PAD_RIGHT);
            }
            $ct .= $state->enc($xi);
        }
        // tag = Finalize(|ad|, |msg|)
        // ct = Truncate(ct, |msg|)
        $tag = $state->finalize(
            $ad_len << 3,
            $msg_len << 3
        );
        // return ct and tag
        return array(
            self::substr($ct, 0, $msg_len),
            $tag
        );
    }

    /**
     * @param string $key
     * @param string $nonce
     * @return ParagonIE_Sodium_Core_AEGIS_State128L
     */
    public static function init($key, $nonce)
    {
        return ParagonIE_Sodium_Core_AEGIS_State128L::init($key, $nonce);
    }
}
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�Z���.}��}����AEGIS/State256.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_AEGIS_State256', false)) {
    return;
}

if (!defined('SODIUM_COMPAT_AEGIS_C0')) {
    define('SODIUM_COMPAT_AEGIS_C0', "\x00\x01\x01\x02\x03\x05\x08\x0d\x15\x22\x37\x59\x90\xe9\x79\x62");
}
if (!defined('SODIUM_COMPAT_AEGIS_C1')) {
    define('SODIUM_COMPAT_AEGIS_C1', "\xdb\x3d\x18\x55\x6d\xc2\x2f\xf1\x20\x11\x31\x42\x73\xb5\x28\xdd");
}

class ParagonIE_Sodium_Core_AEGIS_State256
{
    /** @var array<int, string> $state */
    protected $state;
    public function __construct()
    {
        $this->state = array_fill(0, 6, '');
    }

    /**
     * @internal Only use this for unit tests!
     * @return string[]
     */
    public function getState()
    {
        return array_values($this->state);
    }

    /**
     * @param array $input
     * @return self
     * @throws SodiumException
     *
     * @internal Only for unit tests
     */
    public static function initForUnitTests(array $input)
    {
        if (count($input) < 6) {
            throw new SodiumException('invalid input');
        }
        $state = new self();
        for ($i = 0; $i < 6; ++$i) {
            $state->state[$i] = $input[$i];
        }
        return $state;
    }

    /**
     * @param string $key
     * @param string $nonce
     * @return self
     */
    public static function init($key, $nonce)
    {
        $state = new self();
        $k0 = ParagonIE_Sodium_Core_Util::substr($key, 0, 16);
        $k1 = ParagonIE_Sodium_Core_Util::substr($key, 16, 16);
        $n0 = ParagonIE_Sodium_Core_Util::substr($nonce, 0, 16);
        $n1 = ParagonIE_Sodium_Core_Util::substr($nonce, 16, 16);

        // S0 = k0 ^ n0
        // S1 = k1 ^ n1
        // S2 = C1
        // S3 = C0
        // S4 = k0 ^ C0
        // S5 = k1 ^ C1
        $k0_n0 = $k0 ^ $n0;
        $k1_n1 = $k1 ^ $n1;
        $state->state[0] = $k0_n0;
        $state->state[1] = $k1_n1;
        $state->state[2] = SODIUM_COMPAT_AEGIS_C1;
        $state->state[3] = SODIUM_COMPAT_AEGIS_C0;
        $state->state[4] = $k0 ^ SODIUM_COMPAT_AEGIS_C0;
        $state->state[5] = $k1 ^ SODIUM_COMPAT_AEGIS_C1;

        // Repeat(4,
        //   Update(k0)
        //   Update(k1)
        //   Update(k0 ^ n0)
        //   Update(k1 ^ n1)
        // )
        for ($i = 0; $i < 4; ++$i) {
            $state->update($k0);
            $state->update($k1);
            $state->update($k0 ^ $n0);
            $state->update($k1 ^ $n1);
        }
        return $state;
    }

    /**
     * @param string $ai
     * @return self
     * @throws SodiumException
     */
    public function absorb($ai)
    {
        if (ParagonIE_Sodium_Core_Util::strlen($ai) !== 16) {
            throw new SodiumException('Input must be an AES block in size');
        }
        return $this->update($ai);
    }

    /**
     * @param string $ci
     * @return string
     * @throws SodiumException
     */
    public function dec($ci)
    {
        if (ParagonIE_Sodium_Core_Util::strlen($ci) !== 16) {
            throw new SodiumException('Input must be an AES block in size');
        }
        // z = S1 ^ S4 ^ S5 ^ (S2 & S3)
        $z = $this->state[1]
            ^ $this->state[4]
            ^ $this->state[5]
            ^ ParagonIE_Sodium_Core_Util::andStrings($this->state[2], $this->state[3]);
        $xi = $ci ^ $z;
        $this->update($xi);
        return $xi;
    }

    /**
     * @param string $cn
     * @return string
     */
    public function decPartial($cn)
    {
        $len = ParagonIE_Sodium_Core_Util::strlen($cn);
        // z = S1 ^ S4 ^ S5 ^ (S2 & S3)
        $z = $this->state[1]
            ^ $this->state[4]
            ^ $this->state[5]
            ^ ParagonIE_Sodium_Core_Util::andStrings($this->state[2], $this->state[3]);

        // t = ZeroPad(cn, 128)
        $t = str_pad($cn, 16, "\0", STR_PAD_RIGHT);

        // out = t ^ z
        $out = $t ^ $z;

        // xn = Truncate(out, |cn|)
        $xn = ParagonIE_Sodium_Core_Util::substr($out, 0, $len);

        // v = ZeroPad(xn, 128)
        $v = str_pad($xn, 16, "\0", STR_PAD_RIGHT);
        // Update(v)
        $this->update($v);

        // return xn
        return $xn;
    }

    /**
     * @param string $xi
     * @return string
     * @throws SodiumException
     */
    public function enc($xi)
    {
        if (ParagonIE_Sodium_Core_Util::strlen($xi) !== 16) {
            throw new SodiumException('Input must be an AES block in size');
        }
        // z = S1 ^ S4 ^ S5 ^ (S2 & S3)
        $z = $this->state[1]
            ^ $this->state[4]
            ^ $this->state[5]
            ^ ParagonIE_Sodium_Core_Util::andStrings($this->state[2], $this->state[3]);
        $this->update($xi);
        return $xi ^ $z;
    }

    /**
     * @param int $ad_len_bits
     * @param int $msg_len_bits
     * @return string
     */
    public function finalize($ad_len_bits, $msg_len_bits)
    {
        $encoded = ParagonIE_Sodium_Core_Util::store64_le($ad_len_bits) .
            ParagonIE_Sodium_Core_Util::store64_le($msg_len_bits);
        $t = $this->state[3] ^ $encoded;

        for ($i = 0; $i < 7; ++$i) {
            $this->update($t);
        }

        return ($this->state[0] ^ $this->state[1] ^ $this->state[2]) .
            ($this->state[3] ^ $this->state[4] ^ $this->state[5]);
    }

    /**
     * @param string $m
     * @return self
     */
    public function update($m)
    {
        /*
            S'0 = AESRound(S5, S0 ^ M)
            S'1 = AESRound(S0, S1)
            S'2 = AESRound(S1, S2)
            S'3 = AESRound(S2, S3)
            S'4 = AESRound(S3, S4)
            S'5 = AESRound(S4, S5)
         */
        list($s_0, $s_1) = ParagonIE_Sodium_Core_AES::doubleRound(
            $this->state[5],$this->state[0] ^ $m,
            $this->state[0], $this->state[1]
        );

        list($s_2, $s_3) = ParagonIE_Sodium_Core_AES::doubleRound(
            $this->state[1], $this->state[2],
            $this->state[2], $this->state[3]
        );
        list($s_4, $s_5) = ParagonIE_Sodium_Core_AES::doubleRound(
            $this->state[3], $this->state[4],
            $this->state[4], $this->state[5]
        );

        /*
            S0  = S'0
            S1  = S'1
            S2  = S'2
            S3  = S'3
            S4  = S'4
            S5  = S'5
         */
        $this->state[0] = $s_0;
        $this->state[1] = $s_1;
        $this->state[2] = $s_2;
        $this->state[3] = $s_3;
        $this->state[4] = $s_4;
        $this->state[5] = $s_5;
        return $this;
    }
}
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�Z�.]L* ��* ����AEGIS/State128L.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_AEGIS_State128L', false)) {
    return;
}

if (!defined('SODIUM_COMPAT_AEGIS_C0')) {
    define('SODIUM_COMPAT_AEGIS_C0', "\x00\x01\x01\x02\x03\x05\x08\x0d\x15\x22\x37\x59\x90\xe9\x79\x62");
}
if (!defined('SODIUM_COMPAT_AEGIS_C1')) {
    define('SODIUM_COMPAT_AEGIS_C1', "\xdb\x3d\x18\x55\x6d\xc2\x2f\xf1\x20\x11\x31\x42\x73\xb5\x28\xdd");
}

class ParagonIE_Sodium_Core_AEGIS_State128L
{
    /** @var array<int, string> $state */
    protected $state;
    public function __construct()
    {
        $this->state = array_fill(0, 8, '');
    }

    /**
     * @internal Only use this for unit tests!
     * @return string[]
     */
    public function getState()
    {
        return array_values($this->state);
    }

    /**
     * @param array $input
     * @return self
     * @throws SodiumException
     *
     * @internal Only for unit tests
     */
    public static function initForUnitTests(array $input)
    {
        if (count($input) < 8) {
            throw new SodiumException('invalid input');
        }
        $state = new self();
        for ($i = 0; $i < 8; ++$i) {
            $state->state[$i] = $input[$i];
        }
        return $state;
    }

    /**
     * @param string $key
     * @param string $nonce
     * @return self
     */
    public static function init($key, $nonce)
    {
        $state = new self();

        // S0 = key ^ nonce
        $state->state[0] = $key ^ $nonce;
        // S1 = C1
        $state->state[1] = SODIUM_COMPAT_AEGIS_C1;
        // S2 = C0
        $state->state[2] = SODIUM_COMPAT_AEGIS_C0;
        // S3 = C1
        $state->state[3] = SODIUM_COMPAT_AEGIS_C1;
        // S4 = key ^ nonce
        $state->state[4] = $key ^ $nonce;
        // S5 = key ^ C0
        $state->state[5] = $key ^ SODIUM_COMPAT_AEGIS_C0;
        // S6 = key ^ C1
        $state->state[6] = $key ^ SODIUM_COMPAT_AEGIS_C1;
        // S7 = key ^ C0
        $state->state[7] = $key ^ SODIUM_COMPAT_AEGIS_C0;

        // Repeat(10, Update(nonce, key))
        for ($i = 0; $i < 10; ++$i) {
            $state->update($nonce, $key);
        }
        return $state;
    }

    /**
     * @param string $ai
     * @return self
     */
    public function absorb($ai)
    {
        if (ParagonIE_Sodium_Core_Util::strlen($ai) !== 32) {
            throw new SodiumException('Input must be two AES blocks in size');
        }
        $t0 = ParagonIE_Sodium_Core_Util::substr($ai, 0, 16);
        $t1 = ParagonIE_Sodium_Core_Util::substr($ai, 16, 16);
        return $this->update($t0, $t1);
    }


    /**
     * @param string $ci
     * @return string
     * @throws SodiumException
     */
    public function dec($ci)
    {
        if (ParagonIE_Sodium_Core_Util::strlen($ci) !== 32) {
            throw new SodiumException('Input must be two AES blocks in size');
        }

        // z0 = S6 ^ S1 ^ (S2 & S3)
        $z0 = $this->state[6]
            ^ $this->state[1]
            ^ ParagonIE_Sodium_Core_Util::andStrings($this->state[2], $this->state[3]);
        // z1 = S2 ^ S5 ^ (S6 & S7)
        $z1 = $this->state[2]
            ^ $this->state[5]
            ^ ParagonIE_Sodium_Core_Util::andStrings($this->state[6], $this->state[7]);

        // t0, t1 = Split(xi, 128)
        $t0 = ParagonIE_Sodium_Core_Util::substr($ci, 0, 16);
        $t1 = ParagonIE_Sodium_Core_Util::substr($ci, 16, 16);

        // out0 = t0 ^ z0
        // out1 = t1 ^ z1
        $out0 = $t0 ^ $z0;
        $out1 = $t1 ^ $z1;

        // Update(out0, out1)
        // xi = out0 || out1
        $this->update($out0, $out1);
        return $out0 . $out1;
    }

    /**
     * @param string $cn
     * @return string
     */
    public function decPartial($cn)
    {
        $len = ParagonIE_Sodium_Core_Util::strlen($cn);

        // z0 = S6 ^ S1 ^ (S2 & S3)
        $z0 = $this->state[6]
            ^ $this->state[1]
            ^ ParagonIE_Sodium_Core_Util::andStrings($this->state[2], $this->state[3]);
        // z1 = S2 ^ S5 ^ (S6 & S7)
        $z1 = $this->state[2]
            ^ $this->state[5]
            ^ ParagonIE_Sodium_Core_Util::andStrings($this->state[6], $this->state[7]);

        // t0, t1 = Split(ZeroPad(cn, 256), 128)
        $cn = str_pad($cn, 32, "\0", STR_PAD_RIGHT);
        $t0 = ParagonIE_Sodium_Core_Util::substr($cn, 0, 16);
        $t1 = ParagonIE_Sodium_Core_Util::substr($cn, 16, 16);
        // out0 = t0 ^ z0
        // out1 = t1 ^ z1
        $out0 = $t0 ^ $z0;
        $out1 = $t1 ^ $z1;

        // xn = Truncate(out0 || out1, |cn|)
        $xn = ParagonIE_Sodium_Core_Util::substr($out0 . $out1, 0, $len);

        // v0, v1 = Split(ZeroPad(xn, 256), 128)
        $padded = str_pad($xn, 32, "\0", STR_PAD_RIGHT);
        $v0 = ParagonIE_Sodium_Core_Util::substr($padded, 0, 16);
        $v1 = ParagonIE_Sodium_Core_Util::substr($padded, 16, 16);
        // Update(v0, v1)
        $this->update($v0, $v1);

        // return xn
        return $xn;
    }

    /**
     * @param string $xi
     * @return string
     * @throws SodiumException
     */
    public function enc($xi)
    {
        if (ParagonIE_Sodium_Core_Util::strlen($xi) !== 32) {
            throw new SodiumException('Input must be two AES blocks in size');
        }

        // z0 = S6 ^ S1 ^ (S2 & S3)
        $z0 = $this->state[6]
            ^ $this->state[1]
            ^ ParagonIE_Sodium_Core_Util::andStrings($this->state[2], $this->state[3]);
        // z1 = S2 ^ S5 ^ (S6 & S7)
        $z1 = $this->state[2]
            ^ $this->state[5]
            ^ ParagonIE_Sodium_Core_Util::andStrings($this->state[6], $this->state[7]);

        // t0, t1 = Split(xi, 128)
        $t0 = ParagonIE_Sodium_Core_Util::substr($xi, 0, 16);
        $t1 = ParagonIE_Sodium_Core_Util::substr($xi, 16, 16);

        // out0 = t0 ^ z0
        // out1 = t1 ^ z1
        $out0 = $t0 ^ $z0;
        $out1 = $t1 ^ $z1;

        // Update(t0, t1)
        // ci = out0 || out1
        $this->update($t0, $t1);

        // return ci
        return $out0 . $out1;
    }

    /**
     * @param int $ad_len_bits
     * @param int $msg_len_bits
     * @return string
     */
    public function finalize($ad_len_bits, $msg_len_bits)
    {
        $encoded = ParagonIE_Sodium_Core_Util::store64_le($ad_len_bits) .
            ParagonIE_Sodium_Core_Util::store64_le($msg_len_bits);
        $t = $this->state[2] ^ $encoded;
        for ($i = 0; $i < 7; ++$i) {
            $this->update($t, $t);
        }
        return ($this->state[0] ^ $this->state[1] ^ $this->state[2] ^ $this->state[3]) .
            ($this->state[4] ^ $this->state[5] ^ $this->state[6] ^ $this->state[7]);
    }

    /**
     * @param string $m0
     * @param string $m1
     * @return self
     */
    public function update($m0, $m1)
    {
        /*
           S'0 = AESRound(S7, S0 ^ M0)
           S'1 = AESRound(S0, S1)
           S'2 = AESRound(S1, S2)
           S'3 = AESRound(S2, S3)
           S'4 = AESRound(S3, S4 ^ M1)
           S'5 = AESRound(S4, S5)
           S'6 = AESRound(S5, S6)
           S'7 = AESRound(S6, S7)
         */
        list($s_0, $s_1) = ParagonIE_Sodium_Core_AES::doubleRound(
            $this->state[7], $this->state[0] ^ $m0,
            $this->state[0], $this->state[1]
        );

        list($s_2, $s_3) = ParagonIE_Sodium_Core_AES::doubleRound(
            $this->state[1], $this->state[2],
            $this->state[2], $this->state[3]
        );

        list($s_4, $s_5) = ParagonIE_Sodium_Core_AES::doubleRound(
            $this->state[3], $this->state[4] ^ $m1,
            $this->state[4], $this->state[5]
        );
        list($s_6, $s_7) = ParagonIE_Sodium_Core_AES::doubleRound(
            $this->state[5], $this->state[6],
            $this->state[6], $this->state[7]
        );

        /*
           S0  = S'0
           S1  = S'1
           S2  = S'2
           S3  = S'3
           S4  = S'4
           S5  = S'5
           S6  = S'6
           S7  = S'7
         */
        $this->state[0] = $s_0;
        $this->state[1] = $s_1;
        $this->state[2] = $s_2;
        $this->state[3] = $s_3;
        $this->state[4] = $s_4;
        $this->state[5] = $s_5;
        $this->state[6] = $s_6;
        $this->state[7] = $s_7;
        return $this;
    }
}PK�����
�Z�o��|U��|U����Ristretto255.phpnu��[�����������<?php

/**
 * Class ParagonIE_Sodium_Core_Ristretto255
 */
class ParagonIE_Sodium_Core_Ristretto255 extends ParagonIE_Sodium_Core_Ed25519
{
    const crypto_core_ristretto255_HASHBYTES = 64;
    const HASH_SC_L = 48;
    const CORE_H2C_SHA256 = 1;
    const CORE_H2C_SHA512 = 2;

    /**
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
     * @param int $b
     * @return ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public static function fe_cneg(ParagonIE_Sodium_Core_Curve25519_Fe $f, $b)
    {
        $negf = self::fe_neg($f);
        return self::fe_cmov($f, $negf, $b);
    }

    /**
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
     * @return ParagonIE_Sodium_Core_Curve25519_Fe
     * @throws SodiumException
     */
    public static function fe_abs(ParagonIE_Sodium_Core_Curve25519_Fe $f)
    {
        return self::fe_cneg($f, self::fe_isnegative($f));
    }

    /**
     * Returns 0 if this field element results in all NUL bytes.
     *
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
     * @return int
     * @throws SodiumException
     */
    public static function fe_iszero(ParagonIE_Sodium_Core_Curve25519_Fe $f)
    {
        static $zero;
        if ($zero === null) {
            $zero = str_repeat("\x00", 32);
        }
        /** @var string $zero */
        $str = self::fe_tobytes($f);

        $d = 0;
        for ($i = 0; $i < 32; ++$i) {
            $d |= self::chrToInt($str[$i]);
        }
        return (($d - 1) >> 31) & 1;
    }


    /**
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $u
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $v
     * @return array{x: ParagonIE_Sodium_Core_Curve25519_Fe, nonsquare: int}
     *
     * @throws SodiumException
     */
    public static function ristretto255_sqrt_ratio_m1(
        ParagonIE_Sodium_Core_Curve25519_Fe $u,
        ParagonIE_Sodium_Core_Curve25519_Fe $v
    ) {
        $sqrtm1 = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$sqrtm1);

        $v3 = self::fe_mul(
            self::fe_sq($v),
            $v
        ); /* v3 = v^3 */
        $x = self::fe_mul(
            self::fe_mul(
                self::fe_sq($v3),
                $u
            ),
            $v
        ); /* x = uv^7 */

        $x = self::fe_mul(
            self::fe_mul(
                self::fe_pow22523($x), /* x = (uv^7)^((q-5)/8) */
                $v3
            ),
            $u
        ); /* x = uv^3(uv^7)^((q-5)/8) */

        $vxx = self::fe_mul(
            self::fe_sq($x),
            $v
        ); /* vx^2 */

        $m_root_check = self::fe_sub($vxx, $u); /* vx^2-u */
        $p_root_check = self::fe_add($vxx, $u); /* vx^2+u */
        $f_root_check = self::fe_mul($u, $sqrtm1); /* u*sqrt(-1) */
        $f_root_check = self::fe_add($vxx, $f_root_check); /* vx^2+u*sqrt(-1) */

        $has_m_root = self::fe_iszero($m_root_check);
        $has_p_root = self::fe_iszero($p_root_check);
        $has_f_root = self::fe_iszero($f_root_check);

        $x_sqrtm1 = self::fe_mul($x, $sqrtm1); /* x*sqrt(-1) */

        $x = self::fe_abs(
            self::fe_cmov($x, $x_sqrtm1, $has_p_root | $has_f_root)
        );
        return array(
            'x' => $x,
            'nonsquare' => $has_m_root | $has_p_root
        );
    }

    /**
     * @param string $s
     * @return int
     * @throws SodiumException
     */
    public static function ristretto255_point_is_canonical($s)
    {
        $c = (self::chrToInt($s[31]) & 0x7f) ^ 0x7f;
        for ($i = 30; $i > 0; --$i) {
            $c |= self::chrToInt($s[$i]) ^ 0xff;
        }
        $c = ($c - 1) >> 8;
        $d = (0xed - 1 - self::chrToInt($s[0])) >> 8;
        $e = self::chrToInt($s[31]) >> 7;

        return 1 - ((($c & $d) | $e | self::chrToInt($s[0])) & 1);
    }

    /**
     * @param string $s
     * @param bool $skipCanonicalCheck
     * @return array{h: ParagonIE_Sodium_Core_Curve25519_Ge_P3, res: int}
     * @throws SodiumException
     */
    public static function ristretto255_frombytes($s, $skipCanonicalCheck = false)
    {
        if (!$skipCanonicalCheck) {
            if (!self::ristretto255_point_is_canonical($s)) {
                throw new SodiumException('S is not canonical');
            }
        }

        $s_ = self::fe_frombytes($s);
        $ss = self::fe_sq($s_); /* ss = s^2 */

        $u1 = self::fe_sub(self::fe_1(), $ss); /* u1 = 1-ss */
        $u1u1 = self::fe_sq($u1); /* u1u1 = u1^2 */

        $u2 = self::fe_add(self::fe_1(), $ss); /* u2 = 1+ss */
        $u2u2 = self::fe_sq($u2); /* u2u2 = u2^2 */

        $v = self::fe_mul(
            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$d),
            $u1u1
        ); /* v = d*u1^2 */
        $v = self::fe_neg($v); /* v = -d*u1^2 */
        $v = self::fe_sub($v, $u2u2); /* v = -(d*u1^2)-u2^2 */
        $v_u2u2 = self::fe_mul($v, $u2u2); /* v_u2u2 = v*u2^2 */

        // fe25519_1(one);
        // notsquare = ristretto255_sqrt_ratio_m1(inv_sqrt, one, v_u2u2);
        $one = self::fe_1();
        $result = self::ristretto255_sqrt_ratio_m1($one, $v_u2u2);
        $inv_sqrt = $result['x'];
        $notsquare = $result['nonsquare'];

        $h = new ParagonIE_Sodium_Core_Curve25519_Ge_P3();

        $h->X = self::fe_mul($inv_sqrt, $u2);
        $h->Y = self::fe_mul(self::fe_mul($inv_sqrt, $h->X), $v);

        $h->X = self::fe_mul($h->X, $s_);
        $h->X = self::fe_abs(
            self::fe_add($h->X, $h->X)
        );
        $h->Y = self::fe_mul($u1, $h->Y);
        $h->Z = self::fe_1();
        $h->T = self::fe_mul($h->X, $h->Y);

        $res = - ((1 - $notsquare) | self::fe_isnegative($h->T) | self::fe_iszero($h->Y));
        return array('h' => $h, 'res' => $res);
    }

    /**
     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $h
     * @return string
     * @throws SodiumException
     */
    public static function ristretto255_p3_tobytes(ParagonIE_Sodium_Core_Curve25519_Ge_P3 $h)
    {
        $sqrtm1 = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$sqrtm1);
        $invsqrtamd = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$invsqrtamd);

        $u1 = self::fe_add($h->Z, $h->Y); /* u1 = Z+Y */
        $zmy = self::fe_sub($h->Z, $h->Y); /* zmy = Z-Y */
        $u1 = self::fe_mul($u1, $zmy); /* u1 = (Z+Y)*(Z-Y) */
        $u2 = self::fe_mul($h->X, $h->Y); /* u2 = X*Y */

        $u1_u2u2 = self::fe_mul(self::fe_sq($u2), $u1); /* u1_u2u2 = u1*u2^2 */
        $one = self::fe_1();

        // fe25519_1(one);
        // (void) ristretto255_sqrt_ratio_m1(inv_sqrt, one, u1_u2u2);
        $result = self::ristretto255_sqrt_ratio_m1($one, $u1_u2u2);
        $inv_sqrt = $result['x'];

        $den1 = self::fe_mul($inv_sqrt, $u1); /* den1 = inv_sqrt*u1 */
        $den2 = self::fe_mul($inv_sqrt, $u2); /* den2 = inv_sqrt*u2 */
        $z_inv = self::fe_mul($h->T, self::fe_mul($den1, $den2)); /* z_inv = den1*den2*T */

        $ix = self::fe_mul($h->X, $sqrtm1); /* ix = X*sqrt(-1) */
        $iy = self::fe_mul($h->Y, $sqrtm1); /* iy = Y*sqrt(-1) */
        $eden = self::fe_mul($den1, $invsqrtamd);

        $t_z_inv =  self::fe_mul($h->T, $z_inv); /* t_z_inv = T*z_inv */
        $rotate = self::fe_isnegative($t_z_inv);

        $x_ = self::fe_copy($h->X);
        $y_ = self::fe_copy($h->Y);
        $den_inv = self::fe_copy($den2);

        $x_ = self::fe_cmov($x_, $iy, $rotate);
        $y_ = self::fe_cmov($y_, $ix, $rotate);
        $den_inv = self::fe_cmov($den_inv, $eden, $rotate);

        $x_z_inv = self::fe_mul($x_, $z_inv);
        $y_ = self::fe_cneg($y_, self::fe_isnegative($x_z_inv));


        // fe25519_sub(s_, h->Z, y_);
        // fe25519_mul(s_, den_inv, s_);
        // fe25519_abs(s_, s_);
        // fe25519_tobytes(s, s_);
        return self::fe_tobytes(
            self::fe_abs(
                self::fe_mul(
                    $den_inv,
                    self::fe_sub($h->Z, $y_)
                )
            )
        );
    }

    /**
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $t
     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P3
     *
     * @throws SodiumException
     */
    public static function ristretto255_elligator(ParagonIE_Sodium_Core_Curve25519_Fe $t)
    {
        $sqrtm1   = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$sqrtm1);
        $onemsqd  = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$onemsqd);
        $d        = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$d);
        $sqdmone  = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$sqdmone);
        $sqrtadm1 = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$sqrtadm1);

        $one = self::fe_1();
        $r   = self::fe_mul($sqrtm1, self::fe_sq($t));         /* r = sqrt(-1)*t^2 */
        $u   = self::fe_mul(self::fe_add($r, $one), $onemsqd); /* u = (r+1)*(1-d^2) */
        $c   = self::fe_neg(self::fe_1());                     /* c = -1 */
        $rpd = self::fe_add($r, $d);                           /* rpd = r+d */

        $v = self::fe_mul(
            self::fe_sub(
                $c,
                self::fe_mul($r, $d)
            ),
            $rpd
        ); /* v = (c-r*d)*(r+d) */

        $result = self::ristretto255_sqrt_ratio_m1($u, $v);
        $s = $result['x'];
        $wasnt_square = 1 - $result['nonsquare'];

        $s_prime = self::fe_neg(
            self::fe_abs(
                self::fe_mul($s, $t)
            )
        ); /* s_prime = -|s*t| */
        $s = self::fe_cmov($s, $s_prime, $wasnt_square);
        $c = self::fe_cmov($c, $r, $wasnt_square);

        // fe25519_sub(n, r, one);            /* n = r-1 */
        // fe25519_mul(n, n, c);              /* n = c*(r-1) */
        // fe25519_mul(n, n, ed25519_sqdmone); /* n = c*(r-1)*(d-1)^2 */
        // fe25519_sub(n, n, v);              /* n =  c*(r-1)*(d-1)^2-v */
        $n = self::fe_sub(
            self::fe_mul(
                self::fe_mul(
                    self::fe_sub($r, $one),
                    $c
                ),
                $sqdmone
            ),
            $v
        ); /* n =  c*(r-1)*(d-1)^2-v */

        $w0 = self::fe_mul(
            self::fe_add($s, $s),
            $v
        ); /* w0 = 2s*v */

        $w1 = self::fe_mul($n, $sqrtadm1); /* w1 = n*sqrt(ad-1) */
        $ss = self::fe_sq($s); /* ss = s^2 */
        $w2 = self::fe_sub($one, $ss); /* w2 = 1-s^2 */
        $w3 = self::fe_add($one, $ss); /* w3 = 1+s^2 */

        return new ParagonIE_Sodium_Core_Curve25519_Ge_P3(
            self::fe_mul($w0, $w3),
            self::fe_mul($w2, $w1),
            self::fe_mul($w1, $w3),
            self::fe_mul($w0, $w2)
        );
    }

    /**
     * @param string $h
     * @return string
     * @throws SodiumException
     */
    public static function ristretto255_from_hash($h)
    {
        if (self::strlen($h) !== 64) {
            throw new SodiumException('Hash must be 64 bytes');
        }
        //fe25519_frombytes(r0, h);
        //fe25519_frombytes(r1, h + 32);
        $r0 = self::fe_frombytes(self::substr($h, 0, 32));
        $r1 = self::fe_frombytes(self::substr($h, 32, 32));

        //ristretto255_elligator(&p0, r0);
        //ristretto255_elligator(&p1, r1);
        $p0 = self::ristretto255_elligator($r0);
        $p1 = self::ristretto255_elligator($r1);

        //ge25519_p3_to_cached(&p1_cached, &p1);
        //ge25519_add_cached(&p_p1p1, &p0, &p1_cached);
        $p_p1p1 = self::ge_add(
            $p0,
            self::ge_p3_to_cached($p1)
        );

        //ge25519_p1p1_to_p3(&p, &p_p1p1);
        //ristretto255_p3_tobytes(s, &p);
        return self::ristretto255_p3_tobytes(
            self::ge_p1p1_to_p3($p_p1p1)
        );
    }

    /**
     * @param string $p
     * @return int
     * @throws SodiumException
     */
    public static function is_valid_point($p)
    {
        $result = self::ristretto255_frombytes($p);
        if ($result['res'] !== 0) {
            return 0;
        }
        return 1;
    }

    /**
     * @param string $p
     * @param string $q
     * @return string
     * @throws SodiumException
     */
    public static function ristretto255_add($p, $q)
    {
        $p_res = self::ristretto255_frombytes($p);
        $q_res = self::ristretto255_frombytes($q);
        if ($p_res['res'] !== 0 || $q_res['res'] !== 0) {
            throw new SodiumException('Could not add points');
        }
        $p_p3 = $p_res['h'];
        $q_p3 = $q_res['h'];
        $q_cached = self::ge_p3_to_cached($q_p3);
        $r_p1p1 = self::ge_add($p_p3, $q_cached);
        $r_p3 = self::ge_p1p1_to_p3($r_p1p1);
        return self::ristretto255_p3_tobytes($r_p3);
    }

    /**
     * @param string $p
     * @param string $q
     * @return string
     * @throws SodiumException
     */
    public static function ristretto255_sub($p, $q)
    {
        $p_res = self::ristretto255_frombytes($p);
        $q_res = self::ristretto255_frombytes($q);
        if ($p_res['res'] !== 0 || $q_res['res'] !== 0) {
            throw new SodiumException('Could not add points');
        }
        $p_p3 = $p_res['h'];
        $q_p3 = $q_res['h'];
        $q_cached = self::ge_p3_to_cached($q_p3);
        $r_p1p1 = self::ge_sub($p_p3, $q_cached);
        $r_p3 = self::ge_p1p1_to_p3($r_p1p1);
        return self::ristretto255_p3_tobytes($r_p3);
    }


    /**
     * @param int $hLen
     * @param ?string $ctx
     * @param string $msg
     * @return string
     * @throws SodiumException
     * @psalm-suppress PossiblyInvalidArgument hash API
     */
    protected static function h2c_string_to_hash_sha256($hLen, $ctx, $msg)
    {
        $h = array_fill(0, $hLen, 0);
        $ctx_len = !is_null($ctx) ? self::strlen($ctx) : 0;
        if ($hLen > 0xff) {
            throw new SodiumException('Hash must be less than 256 bytes');
        }

        if ($ctx_len > 0xff) {
            $st = hash_init('sha256');
            self::hash_update($st, "H2C-OVERSIZE-DST-");
            self::hash_update($st, $ctx);
            $ctx = hash_final($st, true);
            $ctx_len = 32;
        }
        $t = array(0, $hLen, 0);
        $ux = str_repeat("\0", 64);
        $st = hash_init('sha256');
        self::hash_update($st, $ux);
        self::hash_update($st, $msg);
        self::hash_update($st, self::intArrayToString($t));
        self::hash_update($st, $ctx);
        self::hash_update($st, self::intToChr($ctx_len));
        $u0 = hash_final($st, true);

        for ($i = 0; $i < $hLen; $i += 64) {
            $ux = self::xorStrings($ux, $u0);
            ++$t[2];
            $st = hash_init('sha256');
            self::hash_update($st, $ux);
            self::hash_update($st, self::intToChr($t[2]));
            self::hash_update($st, $ctx);
            self::hash_update($st, self::intToChr($ctx_len));
            $ux = hash_final($st, true);
            $amount = min($hLen - $i, 64);
            for ($j = 0; $j < $amount; ++$j) {
                $h[$i + $j] = self::chrToInt($ux[$i]);
            }
        }
        return self::intArrayToString(array_slice($h, 0, $hLen));
    }

    /**
     * @param int $hLen
     * @param ?string $ctx
     * @param string $msg
     * @return string
     * @throws SodiumException
     * @psalm-suppress PossiblyInvalidArgument hash API
     */
    protected static function h2c_string_to_hash_sha512($hLen, $ctx, $msg)
    {
        $h = array_fill(0, $hLen, 0);
        $ctx_len = !is_null($ctx) ? self::strlen($ctx) : 0;
        if ($hLen > 0xff) {
            throw new SodiumException('Hash must be less than 256 bytes');
        }

        if ($ctx_len > 0xff) {
            $st = hash_init('sha256');
            self::hash_update($st, "H2C-OVERSIZE-DST-");
            self::hash_update($st, $ctx);
            $ctx = hash_final($st, true);
            $ctx_len = 32;
        }
        $t = array(0, $hLen, 0);
        $ux = str_repeat("\0", 128);
        $st = hash_init('sha512');
        self::hash_update($st, $ux);
        self::hash_update($st, $msg);
        self::hash_update($st, self::intArrayToString($t));
        self::hash_update($st, $ctx);
        self::hash_update($st, self::intToChr($ctx_len));
        $u0 = hash_final($st, true);

        for ($i = 0; $i < $hLen; $i += 128) {
            $ux = self::xorStrings($ux, $u0);
            ++$t[2];
            $st = hash_init('sha512');
            self::hash_update($st, $ux);
            self::hash_update($st, self::intToChr($t[2]));
            self::hash_update($st, $ctx);
            self::hash_update($st, self::intToChr($ctx_len));
            $ux = hash_final($st, true);
            $amount = min($hLen - $i, 128);
            for ($j = 0; $j < $amount; ++$j) {
                $h[$i + $j] = self::chrToInt($ux[$i]);
            }
        }
        return self::intArrayToString(array_slice($h, 0, $hLen));
    }

    /**
     * @param int $hLen
     * @param ?string $ctx
     * @param string $msg
     * @param int $hash_alg
     * @return string
     * @throws SodiumException
     */
    public static function h2c_string_to_hash($hLen, $ctx, $msg, $hash_alg)
    {
        switch ($hash_alg) {
            case self::CORE_H2C_SHA256:
                return self::h2c_string_to_hash_sha256($hLen, $ctx, $msg);
            case self::CORE_H2C_SHA512:
                return self::h2c_string_to_hash_sha512($hLen, $ctx, $msg);
            default:
                throw new SodiumException('Invalid H2C hash algorithm');
        }
    }

    /**
     * @param ?string $ctx
     * @param string $msg
     * @param int $hash_alg
     * @return string
     * @throws SodiumException
     */
    protected static function _string_to_element($ctx, $msg, $hash_alg)
    {
        return self::ristretto255_from_hash(
            self::h2c_string_to_hash(self::crypto_core_ristretto255_HASHBYTES, $ctx, $msg, $hash_alg)
        );
    }

    /**
     * @return string
     * @throws SodiumException
     * @throws Exception
     */
    public static function ristretto255_random()
    {
        return self::ristretto255_from_hash(
            ParagonIE_Sodium_Compat::randombytes_buf(self::crypto_core_ristretto255_HASHBYTES)
        );
    }

    /**
     * @return string
     * @throws SodiumException
     */
    public static function ristretto255_scalar_random()
    {
        return self::scalar_random();
    }

    /**
     * @param string $s
     * @return string
     * @throws SodiumException
     */
    public static function ristretto255_scalar_complement($s)
    {
        return self::scalar_complement($s);
    }


    /**
     * @param string $s
     * @return string
     */
    public static function ristretto255_scalar_invert($s)
    {
        return self::sc25519_invert($s);
    }

    /**
     * @param string $s
     * @return string
     * @throws SodiumException
     */
    public static function ristretto255_scalar_negate($s)
    {
        return self::scalar_negate($s);
    }

    /**
     * @param string $x
     * @param string $y
     * @return string
     */
    public static function ristretto255_scalar_add($x, $y)
    {
        return self::scalar_add($x, $y);
    }

    /**
     * @param string $x
     * @param string $y
     * @return string
     */
    public static function ristretto255_scalar_sub($x, $y)
    {
        return self::scalar_sub($x, $y);
    }

    /**
     * @param string $x
     * @param string $y
     * @return string
     */
    public static function ristretto255_scalar_mul($x, $y)
    {
        return self::sc25519_mul($x, $y);
    }

    /**
     * @param string $ctx
     * @param string $msg
     * @param int $hash_alg
     * @return string
     * @throws SodiumException
     */
    public static function ristretto255_scalar_from_string($ctx, $msg, $hash_alg)
    {
        $h = array_fill(0, 64, 0);
        $h_be = self::stringToIntArray(
            self::h2c_string_to_hash(
                self::HASH_SC_L, $ctx, $msg, $hash_alg
            )
        );

        for ($i = 0; $i < self::HASH_SC_L; ++$i) {
            $h[$i] = $h_be[self::HASH_SC_L - 1 - $i];
        }
        return self::ristretto255_scalar_reduce(self::intArrayToString($h));
    }

    /**
     * @param string $s
     * @return string
     */
    public static function ristretto255_scalar_reduce($s)
    {
        return self::sc_reduce($s);
    }

    /**
     * @param string $n
     * @param string $p
     * @return string
     * @throws SodiumException
     */
    public static function scalarmult_ristretto255($n, $p)
    {
        if (self::strlen($n) !== 32) {
            throw new SodiumException('Scalar must be 32 bytes, ' . self::strlen($p) . ' given.');
        }
        if (self::strlen($p) !== 32) {
            throw new SodiumException('Point must be 32 bytes, ' . self::strlen($p) . ' given.');
        }
        $result = self::ristretto255_frombytes($p);
        if ($result['res'] !== 0) {
            throw new SodiumException('Could not multiply points');
        }
        $P = $result['h'];

        $t = self::stringToIntArray($n);
        $t[31] &= 0x7f;
        $Q = self::ge_scalarmult(self::intArrayToString($t), $P);
        $q = self::ristretto255_p3_tobytes($Q);
        if (ParagonIE_Sodium_Compat::is_zero($q)) {
            throw new SodiumException('An unknown error has occurred');
        }
        return $q;
    }

    /**
     * @param string $n
     * @return string
     * @throws SodiumException
     */
    public static function scalarmult_ristretto255_base($n)
    {
        $t = self::stringToIntArray($n);
        $t[31] &= 0x7f;
        $Q = self::ge_scalarmult_base(self::intArrayToString($t));
        $q = self::ristretto255_p3_tobytes($Q);
        if (ParagonIE_Sodium_Compat::is_zero($q)) {
            throw new SodiumException('An unknown error has occurred');
        }
        return $q;
    }
}
PK�����
�Z珉����������Curve25519/README.mdnu��[�����������# Curve25519 Data Structures

These are PHP implementation of the [structs used in the ref10 curve25519 code](https://github.com/jedisct1/libsodium/blob/master/src/libsodium/include/sodium/private/curve25519_ref10.h).
PK�����
�Z}ڢTy��y����Curve25519/H.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_Curve25519_H', false)) {
    return;
}

/**
 * Class ParagonIE_Sodium_Core_Curve25519_H
 *
 * This just contains the constants in the ref10/base.h file
 */
class ParagonIE_Sodium_Core_Curve25519_H extends ParagonIE_Sodium_Core_Util
{
    /**
     * See: libsodium's crypto_core/curve25519/ref10/base.h
     *
     * @var array<int, array<int, array<int, array<int, int>>>> Basically, int[32][8][3][10]
     */
    protected static $base = array(
        array(
            array(
                array(25967493, -14356035, 29566456, 3660896, -12694345, 4014787, 27544626, -11754271, -6079156, 2047605),
                array(-12545711, 934262, -2722910, 3049990, -727428, 9406986, 12720692, 5043384, 19500929, -15469378),
                array(-8738181, 4489570, 9688441, -14785194, 10184609, -12363380, 29287919, 11864899, -24514362, -4438546),
            ),
            array(
                array(-12815894, -12976347, -21581243, 11784320, -25355658, -2750717, -11717903, -3814571, -358445, -10211303),
                array(-21703237, 6903825, 27185491, 6451973, -29577724, -9554005, -15616551, 11189268, -26829678, -5319081),
                array(26966642, 11152617, 32442495, 15396054, 14353839, -12752335, -3128826, -9541118, -15472047, -4166697),
            ),
            array(
                array(15636291, -9688557, 24204773, -7912398, 616977, -16685262, 27787600, -14772189, 28944400, -1550024),
                array(16568933, 4717097, -11556148, -1102322, 15682896, -11807043, 16354577, -11775962, 7689662, 11199574),
                array(30464156, -5976125, -11779434, -15670865, 23220365, 15915852, 7512774, 10017326, -17749093, -9920357),
            ),
            array(
                array(-17036878, 13921892, 10945806, -6033431, 27105052, -16084379, -28926210, 15006023, 3284568, -6276540),
                array(23599295, -8306047, -11193664, -7687416, 13236774, 10506355, 7464579, 9656445, 13059162, 10374397),
                array(7798556, 16710257, 3033922, 2874086, 28997861, 2835604, 32406664, -3839045, -641708, -101325),
            ),
            array(
                array(10861363, 11473154, 27284546, 1981175, -30064349, 12577861, 32867885, 14515107, -15438304, 10819380),
                array(4708026, 6336745, 20377586, 9066809, -11272109, 6594696, -25653668, 12483688, -12668491, 5581306),
                array(19563160, 16186464, -29386857, 4097519, 10237984, -4348115, 28542350, 13850243, -23678021, -15815942),
            ),
            array(
                array(-15371964, -12862754, 32573250, 4720197, -26436522, 5875511, -19188627, -15224819, -9818940, -12085777),
                array(-8549212, 109983, 15149363, 2178705, 22900618, 4543417, 3044240, -15689887, 1762328, 14866737),
                array(-18199695, -15951423, -10473290, 1707278, -17185920, 3916101, -28236412, 3959421, 27914454, 4383652),
            ),
            array(
                array(5153746, 9909285, 1723747, -2777874, 30523605, 5516873, 19480852, 5230134, -23952439, -15175766),
                array(-30269007, -3463509, 7665486, 10083793, 28475525, 1649722, 20654025, 16520125, 30598449, 7715701),
                array(28881845, 14381568, 9657904, 3680757, -20181635, 7843316, -31400660, 1370708, 29794553, -1409300),
            ),
            array(
                array(14499471, -2729599, -33191113, -4254652, 28494862, 14271267, 30290735, 10876454, -33154098, 2381726),
                array(-7195431, -2655363, -14730155, 462251, -27724326, 3941372, -6236617, 3696005, -32300832, 15351955),
                array(27431194, 8222322, 16448760, -3907995, -18707002, 11938355, -32961401, -2970515, 29551813, 10109425),
            ),
        ),
        array(
            array(
                array(-13657040, -13155431, -31283750, 11777098, 21447386, 6519384, -2378284, -1627556, 10092783, -4764171),
                array(27939166, 14210322, 4677035, 16277044, -22964462, -12398139, -32508754, 12005538, -17810127, 12803510),
                array(17228999, -15661624, -1233527, 300140, -1224870, -11714777, 30364213, -9038194, 18016357, 4397660),
            ),
            array(
                array(-10958843, -7690207, 4776341, -14954238, 27850028, -15602212, -26619106, 14544525, -17477504, 982639),
                array(29253598, 15796703, -2863982, -9908884, 10057023, 3163536, 7332899, -4120128, -21047696, 9934963),
                array(5793303, 16271923, -24131614, -10116404, 29188560, 1206517, -14747930, 4559895, -30123922, -10897950),
            ),
            array(
                array(-27643952, -11493006, 16282657, -11036493, 28414021, -15012264, 24191034, 4541697, -13338309, 5500568),
                array(12650548, -1497113, 9052871, 11355358, -17680037, -8400164, -17430592, 12264343, 10874051, 13524335),
                array(25556948, -3045990, 714651, 2510400, 23394682, -10415330, 33119038, 5080568, -22528059, 5376628),
            ),
            array(
                array(-26088264, -4011052, -17013699, -3537628, -6726793, 1920897, -22321305, -9447443, 4535768, 1569007),
                array(-2255422, 14606630, -21692440, -8039818, 28430649, 8775819, -30494562, 3044290, 31848280, 12543772),
                array(-22028579, 2943893, -31857513, 6777306, 13784462, -4292203, -27377195, -2062731, 7718482, 14474653),
            ),
            array(
                array(2385315, 2454213, -22631320, 46603, -4437935, -15680415, 656965, -7236665, 24316168, -5253567),
                array(13741529, 10911568, -33233417, -8603737, -20177830, -1033297, 33040651, -13424532, -20729456, 8321686),
                array(21060490, -2212744, 15712757, -4336099, 1639040, 10656336, 23845965, -11874838, -9984458, 608372),
            ),
            array(
                array(-13672732, -15087586, -10889693, -7557059, -6036909, 11305547, 1123968, -6780577, 27229399, 23887),
                array(-23244140, -294205, -11744728, 14712571, -29465699, -2029617, 12797024, -6440308, -1633405, 16678954),
                array(-29500620, 4770662, -16054387, 14001338, 7830047, 9564805, -1508144, -4795045, -17169265, 4904953),
            ),
            array(
                array(24059557, 14617003, 19037157, -15039908, 19766093, -14906429, 5169211, 16191880, 2128236, -4326833),
                array(-16981152, 4124966, -8540610, -10653797, 30336522, -14105247, -29806336, 916033, -6882542, -2986532),
                array(-22630907, 12419372, -7134229, -7473371, -16478904, 16739175, 285431, 2763829, 15736322, 4143876),
            ),
            array(
                array(2379352, 11839345, -4110402, -5988665, 11274298, 794957, 212801, -14594663, 23527084, -16458268),
                array(33431127, -11130478, -17838966, -15626900, 8909499, 8376530, -32625340, 4087881, -15188911, -14416214),
                array(1767683, 7197987, -13205226, -2022635, -13091350, 448826, 5799055, 4357868, -4774191, -16323038),
            ),
        ),
        array(
            array(
                array(6721966, 13833823, -23523388, -1551314, 26354293, -11863321, 23365147, -3949732, 7390890, 2759800),
                array(4409041, 2052381, 23373853, 10530217, 7676779, -12885954, 21302353, -4264057, 1244380, -12919645),
                array(-4421239, 7169619, 4982368, -2957590, 30256825, -2777540, 14086413, 9208236, 15886429, 16489664),
            ),
            array(
                array(1996075, 10375649, 14346367, 13311202, -6874135, -16438411, -13693198, 398369, -30606455, -712933),
                array(-25307465, 9795880, -2777414, 14878809, -33531835, 14780363, 13348553, 12076947, -30836462, 5113182),
                array(-17770784, 11797796, 31950843, 13929123, -25888302, 12288344, -30341101, -7336386, 13847711, 5387222),
            ),
            array(
                array(-18582163, -3416217, 17824843, -2340966, 22744343, -10442611, 8763061, 3617786, -19600662, 10370991),
                array(20246567, -14369378, 22358229, -543712, 18507283, -10413996, 14554437, -8746092, 32232924, 16763880),
                array(9648505, 10094563, 26416693, 14745928, -30374318, -6472621, 11094161, 15689506, 3140038, -16510092),
            ),
            array(
                array(-16160072, 5472695, 31895588, 4744994, 8823515, 10365685, -27224800, 9448613, -28774454, 366295),
                array(19153450, 11523972, -11096490, -6503142, -24647631, 5420647, 28344573, 8041113, 719605, 11671788),
                array(8678025, 2694440, -6808014, 2517372, 4964326, 11152271, -15432916, -15266516, 27000813, -10195553),
            ),
            array(
                array(-15157904, 7134312, 8639287, -2814877, -7235688, 10421742, 564065, 5336097, 6750977, -14521026),
                array(11836410, -3979488, 26297894, 16080799, 23455045, 15735944, 1695823, -8819122, 8169720, 16220347),
                array(-18115838, 8653647, 17578566, -6092619, -8025777, -16012763, -11144307, -2627664, -5990708, -14166033),
            ),
            array(
                array(-23308498, -10968312, 15213228, -10081214, -30853605, -11050004, 27884329, 2847284, 2655861, 1738395),
                array(-27537433, -14253021, -25336301, -8002780, -9370762, 8129821, 21651608, -3239336, -19087449, -11005278),
                array(1533110, 3437855, 23735889, 459276, 29970501, 11335377, 26030092, 5821408, 10478196, 8544890),
            ),
            array(
                array(32173121, -16129311, 24896207, 3921497, 22579056, -3410854, 19270449, 12217473, 17789017, -3395995),
                array(-30552961, -2228401, -15578829, -10147201, 13243889, 517024, 15479401, -3853233, 30460520, 1052596),
                array(-11614875, 13323618, 32618793, 8175907, -15230173, 12596687, 27491595, -4612359, 3179268, -9478891),
            ),
            array(
                array(31947069, -14366651, -4640583, -15339921, -15125977, -6039709, -14756777, -16411740, 19072640, -9511060),
                array(11685058, 11822410, 3158003, -13952594, 33402194, -4165066, 5977896, -5215017, 473099, 5040608),
                array(-20290863, 8198642, -27410132, 11602123, 1290375, -2799760, 28326862, 1721092, -19558642, -3131606),
            ),
        ),
        array(
            array(
                array(7881532, 10687937, 7578723, 7738378, -18951012, -2553952, 21820786, 8076149, -27868496, 11538389),
                array(-19935666, 3899861, 18283497, -6801568, -15728660, -11249211, 8754525, 7446702, -5676054, 5797016),
                array(-11295600, -3793569, -15782110, -7964573, 12708869, -8456199, 2014099, -9050574, -2369172, -5877341),
            ),
            array(
                array(-22472376, -11568741, -27682020, 1146375, 18956691, 16640559, 1192730, -3714199, 15123619, 10811505),
                array(14352098, -3419715, -18942044, 10822655, 32750596, 4699007, -70363, 15776356, -28886779, -11974553),
                array(-28241164, -8072475, -4978962, -5315317, 29416931, 1847569, -20654173, -16484855, 4714547, -9600655),
            ),
            array(
                array(15200332, 8368572, 19679101, 15970074, -31872674, 1959451, 24611599, -4543832, -11745876, 12340220),
                array(12876937, -10480056, 33134381, 6590940, -6307776, 14872440, 9613953, 8241152, 15370987, 9608631),
                array(-4143277, -12014408, 8446281, -391603, 4407738, 13629032, -7724868, 15866074, -28210621, -8814099),
            ),
            array(
                array(26660628, -15677655, 8393734, 358047, -7401291, 992988, -23904233, 858697, 20571223, 8420556),
                array(14620715, 13067227, -15447274, 8264467, 14106269, 15080814, 33531827, 12516406, -21574435, -12476749),
                array(236881, 10476226, 57258, -14677024, 6472998, 2466984, 17258519, 7256740, 8791136, 15069930),
            ),
            array(
                array(1276410, -9371918, 22949635, -16322807, -23493039, -5702186, 14711875, 4874229, -30663140, -2331391),
                array(5855666, 4990204, -13711848, 7294284, -7804282, 1924647, -1423175, -7912378, -33069337, 9234253),
                array(20590503, -9018988, 31529744, -7352666, -2706834, 10650548, 31559055, -11609587, 18979186, 13396066),
            ),
            array(
                array(24474287, 4968103, 22267082, 4407354, 24063882, -8325180, -18816887, 13594782, 33514650, 7021958),
                array(-11566906, -6565505, -21365085, 15928892, -26158305, 4315421, -25948728, -3916677, -21480480, 12868082),
                array(-28635013, 13504661, 19988037, -2132761, 21078225, 6443208, -21446107, 2244500, -12455797, -8089383),
            ),
            array(
                array(-30595528, 13793479, -5852820, 319136, -25723172, -6263899, 33086546, 8957937, -15233648, 5540521),
                array(-11630176, -11503902, -8119500, -7643073, 2620056, 1022908, -23710744, -1568984, -16128528, -14962807),
                array(23152971, 775386, 27395463, 14006635, -9701118, 4649512, 1689819, 892185, -11513277, -15205948),
            ),
            array(
                array(9770129, 9586738, 26496094, 4324120, 1556511, -3550024, 27453819, 4763127, -19179614, 5867134),
                array(-32765025, 1927590, 31726409, -4753295, 23962434, -16019500, 27846559, 5931263, -29749703, -16108455),
                array(27461885, -2977536, 22380810, 1815854, -23033753, -3031938, 7283490, -15148073, -19526700, 7734629),
            ),
        ),
        array(
            array(
                array(-8010264, -9590817, -11120403, 6196038, 29344158, -13430885, 7585295, -3176626, 18549497, 15302069),
                array(-32658337, -6171222, -7672793, -11051681, 6258878, 13504381, 10458790, -6418461, -8872242, 8424746),
                array(24687205, 8613276, -30667046, -3233545, 1863892, -1830544, 19206234, 7134917, -11284482, -828919),
            ),
            array(
                array(11334899, -9218022, 8025293, 12707519, 17523892, -10476071, 10243738, -14685461, -5066034, 16498837),
                array(8911542, 6887158, -9584260, -6958590, 11145641, -9543680, 17303925, -14124238, 6536641, 10543906),
                array(-28946384, 15479763, -17466835, 568876, -1497683, 11223454, -2669190, -16625574, -27235709, 8876771),
            ),
            array(
                array(-25742899, -12566864, -15649966, -846607, -33026686, -796288, -33481822, 15824474, -604426, -9039817),
                array(10330056, 70051, 7957388, -9002667, 9764902, 15609756, 27698697, -4890037, 1657394, 3084098),
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            array(
                array(26047220, -11751471, -6900323, -16521798, 24092068, 9158119, -4273545, -12555558, -29365436, -5498272),
                array(17510331, -322857, 5854289, 8403524, 17133918, -3112612, -28111007, 12327945, 10750447, 10014012),
                array(-10312768, 3936952, 9156313, -8897683, 16498692, -994647, -27481051, -666732, 3424691, 7540221),
            ),
            array(
                array(30322361, -6964110, 11361005, -4143317, 7433304, 4989748, -7071422, -16317219, -9244265, 15258046),
                array(13054562, -2779497, 19155474, 469045, -12482797, 4566042, 5631406, 2711395, 1062915, -5136345),
                array(-19240248, -11254599, -29509029, -7499965, -5835763, 13005411, -6066489, 12194497, 32960380, 1459310),
            ),
        ),
        array(
            array(
                array(19852034, 7027924, 23669353, 10020366, 8586503, -6657907, 394197, -6101885, 18638003, -11174937),
                array(31395534, 15098109, 26581030, 8030562, -16527914, -5007134, 9012486, -7584354, -6643087, -5442636),
                array(-9192165, -2347377, -1997099, 4529534, 25766844, 607986, -13222, 9677543, -32294889, -6456008),
            ),
            array(
                array(-2444496, -149937, 29348902, 8186665, 1873760, 12489863, -30934579, -7839692, -7852844, -8138429),
                array(-15236356, -15433509, 7766470, 746860, 26346930, -10221762, -27333451, 10754588, -9431476, 5203576),
                array(31834314, 14135496, -770007, 5159118, 20917671, -16768096, -7467973, -7337524, 31809243, 7347066),
            ),
            array(
                array(-9606723, -11874240, 20414459, 13033986, 13716524, -11691881, 19797970, -12211255, 15192876, -2087490),
                array(-12663563, -2181719, 1168162, -3804809, 26747877, -14138091, 10609330, 12694420, 33473243, -13382104),
                array(33184999, 11180355, 15832085, -11385430, -1633671, 225884, 15089336, -11023903, -6135662, 14480053),
            ),
            array(
                array(31308717, -5619998, 31030840, -1897099, 15674547, -6582883, 5496208, 13685227, 27595050, 8737275),
                array(-20318852, -15150239, 10933843, -16178022, 8335352, -7546022, -31008351, -12610604, 26498114, 66511),
                array(22644454, -8761729, -16671776, 4884562, -3105614, -13559366, 30540766, -4286747, -13327787, -7515095),
            ),
            array(
                array(-28017847, 9834845, 18617207, -2681312, -3401956, -13307506, 8205540, 13585437, -17127465, 15115439),
                array(23711543, -672915, 31206561, -8362711, 6164647, -9709987, -33535882, -1426096, 8236921, 16492939),
                array(-23910559, -13515526, -26299483, -4503841, 25005590, -7687270, 19574902, 10071562, 6708380, -6222424),
            ),
            array(
                array(2101391, -4930054, 19702731, 2367575, -15427167, 1047675, 5301017, 9328700, 29955601, -11678310),
                array(3096359, 9271816, -21620864, -15521844, -14847996, -7592937, -25892142, -12635595, -9917575, 6216608),
                array(-32615849, 338663, -25195611, 2510422, -29213566, -13820213, 24822830, -6146567, -26767480, 7525079),
            ),
            array(
                array(-23066649, -13985623, 16133487, -7896178, -3389565, 778788, -910336, -2782495, -19386633, 11994101),
                array(21691500, -13624626, -641331, -14367021, 3285881, -3483596, -25064666, 9718258, -7477437, 13381418),
                array(18445390, -4202236, 14979846, 11622458, -1727110, -3582980, 23111648, -6375247, 28535282, 15779576),
            ),
            array(
                array(30098053, 3089662, -9234387, 16662135, -21306940, 11308411, -14068454, 12021730, 9955285, -16303356),
                array(9734894, -14576830, -7473633, -9138735, 2060392, 11313496, -18426029, 9924399, 20194861, 13380996),
                array(-26378102, -7965207, -22167821, 15789297, -18055342, -6168792, -1984914, 15707771, 26342023, 10146099),
            ),
        ),
        array(
            array(
                array(-26016874, -219943, 21339191, -41388, 19745256, -2878700, -29637280, 2227040, 21612326, -545728),
                array(-13077387, 1184228, 23562814, -5970442, -20351244, -6348714, 25764461, 12243797, -20856566, 11649658),
                array(-10031494, 11262626, 27384172, 2271902, 26947504, -15997771, 39944, 6114064, 33514190, 2333242),
            ),
            array(
                array(-21433588, -12421821, 8119782, 7219913, -21830522, -9016134, -6679750, -12670638, 24350578, -13450001),
                array(-4116307, -11271533, -23886186, 4843615, -30088339, 690623, -31536088, -10406836, 8317860, 12352766),
                array(18200138, -14475911, -33087759, -2696619, -23702521, -9102511, -23552096, -2287550, 20712163, 6719373),
            ),
            array(
                array(26656208, 6075253, -7858556, 1886072, -28344043, 4262326, 11117530, -3763210, 26224235, -3297458),
                array(-17168938, -14854097, -3395676, -16369877, -19954045, 14050420, 21728352, 9493610, 18620611, -16428628),
                array(-13323321, 13325349, 11432106, 5964811, 18609221, 6062965, -5269471, -9725556, -30701573, -16479657),
            ),
            array(
                array(-23860538, -11233159, 26961357, 1640861, -32413112, -16737940, 12248509, -5240639, 13735342, 1934062),
                array(25089769, 6742589, 17081145, -13406266, 21909293, -16067981, -15136294, -3765346, -21277997, 5473616),
                array(31883677, -7961101, 1083432, -11572403, 22828471, 13290673, -7125085, 12469656, 29111212, -5451014),
            ),
            array(
                array(24244947, -15050407, -26262976, 2791540, -14997599, 16666678, 24367466, 6388839, -10295587, 452383),
                array(-25640782, -3417841, 5217916, 16224624, 19987036, -4082269, -24236251, -5915248, 15766062, 8407814),
                array(-20406999, 13990231, 15495425, 16395525, 5377168, 15166495, -8917023, -4388953, -8067909, 2276718),
            ),
            array(
                array(30157918, 12924066, -17712050, 9245753, 19895028, 3368142, -23827587, 5096219, 22740376, -7303417),
                array(2041139, -14256350, 7783687, 13876377, -25946985, -13352459, 24051124, 13742383, -15637599, 13295222),
                array(33338237, -8505733, 12532113, 7977527, 9106186, -1715251, -17720195, -4612972, -4451357, -14669444),
            ),
            array(
                array(-20045281, 5454097, -14346548, 6447146, 28862071, 1883651, -2469266, -4141880, 7770569, 9620597),
                array(23208068, 7979712, 33071466, 8149229, 1758231, -10834995, 30945528, -1694323, -33502340, -14767970),
                array(1439958, -16270480, -1079989, -793782, 4625402, 10647766, -5043801, 1220118, 30494170, -11440799),
            ),
            array(
                array(-5037580, -13028295, -2970559, -3061767, 15640974, -6701666, -26739026, 926050, -1684339, -13333647),
                array(13908495, -3549272, 30919928, -6273825, -21521863, 7989039, 9021034, 9078865, 3353509, 4033511),
                array(-29663431, -15113610, 32259991, -344482, 24295849, -12912123, 23161163, 8839127, 27485041, 7356032),
            ),
        ),
        array(
            array(
                array(9661027, 705443, 11980065, -5370154, -1628543, 14661173, -6346142, 2625015, 28431036, -16771834),
                array(-23839233, -8311415, -25945511, 7480958, -17681669, -8354183, -22545972, 14150565, 15970762, 4099461),
                array(29262576, 16756590, 26350592, -8793563, 8529671, -11208050, 13617293, -9937143, 11465739, 8317062),
            ),
            array(
                array(-25493081, -6962928, 32500200, -9419051, -23038724, -2302222, 14898637, 3848455, 20969334, -5157516),
                array(-20384450, -14347713, -18336405, 13884722, -33039454, 2842114, -21610826, -3649888, 11177095, 14989547),
                array(-24496721, -11716016, 16959896, 2278463, 12066309, 10137771, 13515641, 2581286, -28487508, 9930240),
            ),
            array(
                array(-17751622, -2097826, 16544300, -13009300, -15914807, -14949081, 18345767, -13403753, 16291481, -5314038),
                array(-33229194, 2553288, 32678213, 9875984, 8534129, 6889387, -9676774, 6957617, 4368891, 9788741),
                array(16660756, 7281060, -10830758, 12911820, 20108584, -8101676, -21722536, -8613148, 16250552, -11111103),
            ),
            array(
                array(-19765507, 2390526, -16551031, 14161980, 1905286, 6414907, 4689584, 10604807, -30190403, 4782747),
                array(-1354539, 14736941, -7367442, -13292886, 7710542, -14155590, -9981571, 4383045, 22546403, 437323),
                array(31665577, -12180464, -16186830, 1491339, -18368625, 3294682, 27343084, 2786261, -30633590, -14097016),
            ),
            array(
                array(-14467279, -683715, -33374107, 7448552, 19294360, 14334329, -19690631, 2355319, -19284671, -6114373),
                array(15121312, -15796162, 6377020, -6031361, -10798111, -12957845, 18952177, 15496498, -29380133, 11754228),
                array(-2637277, -13483075, 8488727, -14303896, 12728761, -1622493, 7141596, 11724556, 22761615, -10134141),
            ),
            array(
                array(16918416, 11729663, -18083579, 3022987, -31015732, -13339659, -28741185, -12227393, 32851222, 11717399),
                array(11166634, 7338049, -6722523, 4531520, -29468672, -7302055, 31474879, 3483633, -1193175, -4030831),
                array(-185635, 9921305, 31456609, -13536438, -12013818, 13348923, 33142652, 6546660, -19985279, -3948376),
            ),
            array(
                array(-32460596, 11266712, -11197107, -7899103, 31703694, 3855903, -8537131, -12833048, -30772034, -15486313),
                array(-18006477, 12709068, 3991746, -6479188, -21491523, -10550425, -31135347, -16049879, 10928917, 3011958),
                array(-6957757, -15594337, 31696059, 334240, 29576716, 14796075, -30831056, -12805180, 18008031, 10258577),
            ),
            array(
                array(-22448644, 15655569, 7018479, -4410003, -30314266, -1201591, -1853465, 1367120, 25127874, 6671743),
                array(29701166, -14373934, -10878120, 9279288, -17568, 13127210, 21382910, 11042292, 25838796, 4642684),
                array(-20430234, 14955537, -24126347, 8124619, -5369288, -5990470, 30468147, -13900640, 18423289, 4177476),
            ),
        )
    );

    /**
     * See: libsodium's crypto_core/curve25519/ref10/base2.h
     *
     * @var array basically int[8][3]
     */
    protected static $base2 = array(
        array(
            array(25967493, -14356035, 29566456, 3660896, -12694345, 4014787, 27544626, -11754271, -6079156, 2047605),
            array(-12545711, 934262, -2722910, 3049990, -727428, 9406986, 12720692, 5043384, 19500929, -15469378),
            array(-8738181, 4489570, 9688441, -14785194, 10184609, -12363380, 29287919, 11864899, -24514362, -4438546),
        ),
        array(
            array(15636291, -9688557, 24204773, -7912398, 616977, -16685262, 27787600, -14772189, 28944400, -1550024),
            array(16568933, 4717097, -11556148, -1102322, 15682896, -11807043, 16354577, -11775962, 7689662, 11199574),
            array(30464156, -5976125, -11779434, -15670865, 23220365, 15915852, 7512774, 10017326, -17749093, -9920357),
        ),
        array(
            array(10861363, 11473154, 27284546, 1981175, -30064349, 12577861, 32867885, 14515107, -15438304, 10819380),
            array(4708026, 6336745, 20377586, 9066809, -11272109, 6594696, -25653668, 12483688, -12668491, 5581306),
            array(19563160, 16186464, -29386857, 4097519, 10237984, -4348115, 28542350, 13850243, -23678021, -15815942),
        ),
        array(
            array(5153746, 9909285, 1723747, -2777874, 30523605, 5516873, 19480852, 5230134, -23952439, -15175766),
            array(-30269007, -3463509, 7665486, 10083793, 28475525, 1649722, 20654025, 16520125, 30598449, 7715701),
            array(28881845, 14381568, 9657904, 3680757, -20181635, 7843316, -31400660, 1370708, 29794553, -1409300),
        ),
        array(
            array(-22518993, -6692182, 14201702, -8745502, -23510406, 8844726, 18474211, -1361450, -13062696, 13821877),
            array(-6455177, -7839871, 3374702, -4740862, -27098617, -10571707, 31655028, -7212327, 18853322, -14220951),
            array(4566830, -12963868, -28974889, -12240689, -7602672, -2830569, -8514358, -10431137, 2207753, -3209784),
        ),
        array(
            array(-25154831, -4185821, 29681144, 7868801, -6854661, -9423865, -12437364, -663000, -31111463, -16132436),
            array(25576264, -2703214, 7349804, -11814844, 16472782, 9300885, 3844789, 15725684, 171356, 6466918),
            array(23103977, 13316479, 9739013, -16149481, 817875, -15038942, 8965339, -14088058, -30714912, 16193877),
        ),
        array(
            array(-33521811, 3180713, -2394130, 14003687, -16903474, -16270840, 17238398, 4729455, -18074513, 9256800),
            array(-25182317, -4174131, 32336398, 5036987, -21236817, 11360617, 22616405, 9761698, -19827198, 630305),
            array(-13720693, 2639453, -24237460, -7406481, 9494427, -5774029, -6554551, -15960994, -2449256, -14291300),
        ),
        array(
            array(-3151181, -5046075, 9282714, 6866145, -31907062, -863023, -18940575, 15033784, 25105118, -7894876),
            array(-24326370, 15950226, -31801215, -14592823, -11662737, -5090925, 1573892, -2625887, 2198790, -15804619),
            array(-3099351, 10324967, -2241613, 7453183, -5446979, -2735503, -13812022, -16236442, -32461234, -12290683),
        )
    );

    /**
     * 37095705934669439343138083508754565189542113879843219016388785533085940283555
     *
     * @var array<int, int>
     */
    protected static $d = array(
        -10913610,
        13857413,
        -15372611,
        6949391,
        114729,
        -8787816,
        -6275908,
        -3247719,
        -18696448,
        -12055116
    );

    /**
     * 2 * d = 16295367250680780974490674513165176452449235426866156013048779062215315747161
     *
     * @var array<int, int>
     */
    protected static $d2 = array(
        -21827239,
        -5839606,
        -30745221,
        13898782,
        229458,
        15978800,
        -12551817,
        -6495438,
        29715968,
        9444199
    );

    /**
     * sqrt(-1)
     *
     * @var array<int, int>
     */
    protected static $sqrtm1 = array(
        -32595792,
        -7943725,
        9377950,
        3500415,
        12389472,
        -272473,
        -25146209,
        -2005654,
        326686,
        11406482
    );

    /**
     * 1 / sqrt(a - d)
     *
     * @var array<int, int>
     */
    protected static $invsqrtamd = array(
        6111485,
        4156064,
        -27798727,
        12243468,
        -25904040,
        120897,
        20826367,
        -7060776,
        6093568,
        -1986012
    );

    /**
     *  sqrt(ad - 1) with a = -1 (mod p)
     *
     * @var array<int, int>
     */
    protected static $sqrtadm1 = array(
        24849947,
        -153582,
        -23613485,
        6347715,
        -21072328,
        -667138,
        -25271143,
        -15367704,
        -870347,
        14525639
    );

    /**
     * 1 - d ^ 2
     *
     * @var array<int, int>
     */
    protected static $onemsqd = array(
        6275446,
        -16617371,
        -22938544,
        -3773710,
        11667077,
        7397348,
        -27922721,
        1766195,
        -24433858,
        672203
    );

    /**
     * (d - 1) ^ 2
     * @var array<int, int>
     */
    protected static $sqdmone = array(
        15551795,
        -11097455,
        -13425098,
        -10125071,
        -11896535,
        10178284,
        -26634327,
        4729244,
        -5282110,
        -10116402
    );


    /*
     *  2^252+27742317777372353535851937790883648493
        static const unsigned char L[] = {
            0xed, 0xd3, 0xf5, 0x5c, 0x1a, 0x63, 0x12, 0x58, 0xd6, 0x9c, 0xf7,
            0xa2, 0xde, 0xf9, 0xde, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10
        };
    */
    const L = "\xed\xd3\xf5\x5c\x1a\x63\x12\x58\xd6\x9c\xf7\xa2\xde\xf9\xde\x14\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x10";
}
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if (class_exists('ParagonIE_Sodium_Core_Curve25519_Ge_Precomp', false)) {
    return;
}

/**
 * Class ParagonIE_Sodium_Core_Curve25519_Ge_Precomp
 */
class ParagonIE_Sodium_Core_Curve25519_Ge_Precomp
{
    /**
     * @var ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public $yplusx;

    /**
     * @var ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public $yminusx;

    /**
     * @var ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public $xy2d;

    /**
     * ParagonIE_Sodium_Core_Curve25519_Ge_Precomp constructor.
     *
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $yplusx
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $yminusx
     * @param ParagonIE_Sodium_Core_Curve25519_Fe $xy2d
     */
    public function __construct(
        $yplusx = null,
        $yminusx = null,
        $xy2d = null
    ) {
        if ($yplusx === null) {
            $yplusx = new ParagonIE_Sodium_Core_Curve25519_Fe();
        }
        if (!($yplusx instanceof ParagonIE_Sodium_Core_Curve25519_Fe)) {
            throw new TypeError('Argument 1 must be an instance of ParagonIE_Sodium_Core_Curve25519_Fe');
        }
        $this->yplusx = $yplusx;
        if ($yminusx === null) {
            $yminusx = new ParagonIE_Sodium_Core_Curve25519_Fe();
        }
        if (!($yminusx instanceof ParagonIE_Sodium_Core_Curve25519_Fe)) {
            throw new TypeError('Argument 2 must be an instance of ParagonIE_Sodium_Core_Curve25519_Fe');
        }
        $this->yminusx = $yminusx;
        if ($xy2d === null) {
            $xy2d = new ParagonIE_Sodium_Core_Curve25519_Fe();
        }
        if (!($xy2d instanceof ParagonIE_Sodium_Core_Curve25519_Fe)) {
            throw new TypeError('Argument 3 must be an instance of ParagonIE_Sodium_Core_Curve25519_Fe');
        }
        $this->xy2d = $xy2d;
    }
}
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if (class_exists('ParagonIE_Sodium_Core_Curve25519_Ge_P3', false)) {
    return;
}

/**
 * Class ParagonIE_Sodium_Core_Curve25519_Ge_P3
 */
class ParagonIE_Sodium_Core_Curve25519_Ge_P3
{
    /**
     * @var ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public $X;

    /**
     * @var ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public $Y;

    /**
     * @var ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public $Z;

    /**
     * @var ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public $T;

    /**
     * ParagonIE_Sodium_Core_Curve25519_Ge_P3 constructor.
     *
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $x
     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $y
     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $z
     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $t
     */
    public function __construct(
        $x = null,
        $y = null,
        $z = null,
        $t = null
    ) {
        if ($x === null) {
            $x = new ParagonIE_Sodium_Core_Curve25519_Fe();
        }
        if (!($x instanceof ParagonIE_Sodium_Core_Curve25519_Fe)) {
            throw new TypeError('Argument 1 must be an instance of ParagonIE_Sodium_Core_Curve25519_Fe');
        }
        $this->X = $x;
        if ($y === null) {
            $y = new ParagonIE_Sodium_Core_Curve25519_Fe();
        }
        if (!($y instanceof ParagonIE_Sodium_Core_Curve25519_Fe)) {
            throw new TypeError('Argument 2 must be an instance of ParagonIE_Sodium_Core_Curve25519_Fe');
        }
        $this->Y = $y;
        if ($z === null) {
            $z = new ParagonIE_Sodium_Core_Curve25519_Fe();
        }
        if (!($z instanceof ParagonIE_Sodium_Core_Curve25519_Fe)) {
            throw new TypeError('Argument 3 must be an instance of ParagonIE_Sodium_Core_Curve25519_Fe');
        }
        $this->Z = $z;
        if ($t === null) {
            $t = new ParagonIE_Sodium_Core_Curve25519_Fe();
        }
        if (!($t instanceof ParagonIE_Sodium_Core_Curve25519_Fe)) {
            throw new TypeError('Argument 4 must be an instance of ParagonIE_Sodium_Core_Curve25519_Fe');
        }
        $this->T = $t;
    }
}
PK�����
�Z�r�B	��B	����Curve25519/Ge/Cached.phpnu��[�����������<?php


if (class_exists('ParagonIE_Sodium_Core_Curve25519_Ge_Cached', false)) {
    return;
}
/**
 * Class ParagonIE_Sodium_Core_Curve25519_Ge_Cached
 */
class ParagonIE_Sodium_Core_Curve25519_Ge_Cached
{
    /**
     * @var ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public $YplusX;

    /**
     * @var ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public $YminusX;

    /**
     * @var ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public $Z;

    /**
     * @var ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public $T2d;

    /**
     * ParagonIE_Sodium_Core_Curve25519_Ge_Cached constructor.
     *
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $YplusX
     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $YminusX
     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $Z
     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $T2d
     */
    public function __construct(
        $YplusX = null,
        $YminusX = null,
        $Z = null,
        $T2d = null
    ) {
        if ($YplusX === null) {
            $YplusX = new ParagonIE_Sodium_Core_Curve25519_Fe();
        }
        if (!($YplusX instanceof ParagonIE_Sodium_Core_Curve25519_Fe)) {
            throw new TypeError('Argument 1 must be an instance of ParagonIE_Sodium_Core_Curve25519_Fe');
        }
        $this->YplusX = $YplusX;
        if ($YminusX === null) {
            $YminusX = new ParagonIE_Sodium_Core_Curve25519_Fe();
        }
        if (!($YminusX instanceof ParagonIE_Sodium_Core_Curve25519_Fe)) {
            throw new TypeError('Argument 2 must be an instance of ParagonIE_Sodium_Core_Curve25519_Fe');
        }
        $this->YminusX = $YminusX;
        if ($Z === null) {
            $Z = new ParagonIE_Sodium_Core_Curve25519_Fe();
        }
        if (!($Z instanceof ParagonIE_Sodium_Core_Curve25519_Fe)) {
            throw new TypeError('Argument 3 must be an instance of ParagonIE_Sodium_Core_Curve25519_Fe');
        }
        $this->Z = $Z;
        if ($T2d === null) {
            $T2d = new ParagonIE_Sodium_Core_Curve25519_Fe();
        }
        if (!($T2d instanceof ParagonIE_Sodium_Core_Curve25519_Fe)) {
            throw new TypeError('Argument 4 must be an instance of ParagonIE_Sodium_Core_Curve25519_Fe');
        }
        $this->T2d = $T2d;
    }
}
PK�����
�Z����������Curve25519/Ge/P2.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_Curve25519_Ge_P2', false)) {
    return;
}

/**
 * Class ParagonIE_Sodium_Core_Curve25519_Ge_P2
 */
class ParagonIE_Sodium_Core_Curve25519_Ge_P2
{
    /**
     * @var ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public $X;

    /**
     * @var ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public $Y;

    /**
     * @var ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public $Z;

    /**
     * ParagonIE_Sodium_Core_Curve25519_Ge_P2 constructor.
     *
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $x
     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $y
     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $z
     */
    public function __construct(
        $x = null,
        $y = null,
        $z = null
    ) {
        if ($x === null) {
            $x = new ParagonIE_Sodium_Core_Curve25519_Fe();
        }
        if (!($x instanceof ParagonIE_Sodium_Core_Curve25519_Fe)) {
            throw new TypeError('Argument 1 must be an instance of ParagonIE_Sodium_Core_Curve25519_Fe');
        }
        $this->X = $x;
        if ($y === null) {
            $y = new ParagonIE_Sodium_Core_Curve25519_Fe();
        }
        if (!($y instanceof ParagonIE_Sodium_Core_Curve25519_Fe)) {
            throw new TypeError('Argument 2 must be an instance of ParagonIE_Sodium_Core_Curve25519_Fe');
        }
        $this->Y = $y;
        if ($z === null) {
            $z = new ParagonIE_Sodium_Core_Curve25519_Fe();
        }
        if (!($z instanceof ParagonIE_Sodium_Core_Curve25519_Fe)) {
            throw new TypeError('Argument 3 must be an instance of ParagonIE_Sodium_Core_Curve25519_Fe');
        }
        $this->Z = $z;
    }
}
PK�����
�Z�����������Curve25519/Ge/P1p1.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_Curve25519_Ge_P1p1', false)) {
    return;
}
/**
 * Class ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
 */
class ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
{
    /**
     * @var ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public $X;

    /**
     * @var ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public $Y;

    /**
     * @var ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public $Z;

    /**
     * @var ParagonIE_Sodium_Core_Curve25519_Fe
     */
    public $T;

    /**
     * ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 constructor.
     *
     * @internal You should not use this directly from another application
     *
     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $x
     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $y
     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $z
     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $t
     */
    public function __construct(
        $x = null,
        $y = null,
        $z = null,
        $t = null
    ) {
        if ($x === null) {
            $x = new ParagonIE_Sodium_Core_Curve25519_Fe();
        }
        if (!($x instanceof ParagonIE_Sodium_Core_Curve25519_Fe)) {
            throw new TypeError('Argument 1 must be an instance of ParagonIE_Sodium_Core_Curve25519_Fe');
        }
        $this->X = $x;
        if ($y === null) {
            $y = new ParagonIE_Sodium_Core_Curve25519_Fe();
        }
        if (!($y instanceof ParagonIE_Sodium_Core_Curve25519_Fe)) {
            throw new TypeError('Argument 2 must be an instance of ParagonIE_Sodium_Core_Curve25519_Fe');
        }
        $this->Y = $y;
        if ($z === null) {
            $z = new ParagonIE_Sodium_Core_Curve25519_Fe();
        }
        if (!($z instanceof ParagonIE_Sodium_Core_Curve25519_Fe)) {
            throw new TypeError('Argument 3 must be an instance of ParagonIE_Sodium_Core_Curve25519_Fe');
        }
        $this->Z = $z;
        if ($t === null) {
            $t = new ParagonIE_Sodium_Core_Curve25519_Fe();
        }
        if (!($t instanceof ParagonIE_Sodium_Core_Curve25519_Fe)) {
            throw new TypeError('Argument 4 must be an instance of ParagonIE_Sodium_Core_Curve25519_Fe');
        }
        $this->T = $t;
    }
}
PK�����
�ZCUg������Curve25519/Fe.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_Curve25519_Fe', false)) {
    return;
}

/**
 * Class ParagonIE_Sodium_Core_Curve25519_Fe
 *
 * This represents a Field Element
 */
class ParagonIE_Sodium_Core_Curve25519_Fe implements ArrayAccess
{
    /**
     * @var array<int, int>
     */
    protected $container = array();

    /**
     * @var int
     */
    protected $size = 10;

    /**
     * @internal You should not use this directly from another application
     *
     * @param array<int, int> $array
     * @param bool $save_indexes
     * @return self
     */
    public static function fromArray($array, $save_indexes = null)
    {
        $count = count($array);
        if ($save_indexes) {
            $keys = array_keys($array);
        } else {
            $keys = range(0, $count - 1);
        }
        $array = array_values($array);
        /** @var array<int, int> $keys */

        $obj = new ParagonIE_Sodium_Core_Curve25519_Fe();
        if ($save_indexes) {
            for ($i = 0; $i < $count; ++$i) {
                $obj->offsetSet($keys[$i], $array[$i]);
            }
        } else {
            for ($i = 0; $i < $count; ++$i) {
                $obj->offsetSet($i, $array[$i]);
            }
        }
        return $obj;
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param int|null $offset
     * @param int $value
     * @return void
     * @psalm-suppress MixedArrayOffset
     */
    #[ReturnTypeWillChange]
    public function offsetSet($offset, $value)
    {
        if (!is_int($value)) {
            throw new InvalidArgumentException('Expected an integer');
        }
        if (is_null($offset)) {
            $this->container[] = $value;
        } else {
            $this->container[$offset] = $value;
        }
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param int $offset
     * @return bool
     * @psalm-suppress MixedArrayOffset
     */
    #[ReturnTypeWillChange]
    public function offsetExists($offset)
    {
        return isset($this->container[$offset]);
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param int $offset
     * @return void
     * @psalm-suppress MixedArrayOffset
     */
    #[ReturnTypeWillChange]
    public function offsetUnset($offset)
    {
        unset($this->container[$offset]);
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @param int $offset
     * @return int
     * @psalm-suppress MixedArrayOffset
     */
    #[ReturnTypeWillChange]
    public function offsetGet($offset)
    {
        if (!isset($this->container[$offset])) {
            $this->container[$offset] = 0;
        }
        return (int) ($this->container[$offset]);
    }

    /**
     * @internal You should not use this directly from another application
     *
     * @return array
     */
    public function __debugInfo()
    {
        return array(implode(', ', $this->container));
    }
}
PK�����
�Z$T�-��-����Base64/Original.phpnu��[�����������<?php

/**
 * Class ParagonIE_Sodium_Core_Base64
 *
 *  Copyright (c) 2016 - 2018 Paragon Initiative Enterprises.
 *  Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com)
 */
class ParagonIE_Sodium_Core_Base64_Original
{
    // COPY ParagonIE_Sodium_Core_Base64_Common STARTING HERE
    /**
     * Encode into Base64
     *
     * Base64 character set "[A-Z][a-z][0-9]+/"
     *
     * @param string $src
     * @return string
     * @throws TypeError
     */
    public static function encode($src)
    {
        return self::doEncode($src, true);
    }

    /**
     * Encode into Base64, no = padding
     *
     * Base64 character set "[A-Z][a-z][0-9]+/"
     *
     * @param string $src
     * @return string
     * @throws TypeError
     */
    public static function encodeUnpadded($src)
    {
        return self::doEncode($src, false);
    }

    /**
     * @param string $src
     * @param bool $pad   Include = padding?
     * @return string
     * @throws TypeError
     */
    protected static function doEncode($src, $pad = true)
    {
        $dest = '';
        $srcLen = ParagonIE_Sodium_Core_Util::strlen($src);
        // Main loop (no padding):
        for ($i = 0; $i + 3 <= $srcLen; $i += 3) {
            /** @var array<int, int> $chunk */
            $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, 3));
            $b0 = $chunk[1];
            $b1 = $chunk[2];
            $b2 = $chunk[3];

            $dest .=
                self::encode6Bits(               $b0 >> 2       ) .
                self::encode6Bits((($b0 << 4) | ($b1 >> 4)) & 63) .
                self::encode6Bits((($b1 << 2) | ($b2 >> 6)) & 63) .
                self::encode6Bits(  $b2                     & 63);
        }
        // The last chunk, which may have padding:
        if ($i < $srcLen) {
            /** @var array<int, int> $chunk */
            $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, $srcLen - $i));
            $b0 = $chunk[1];
            if ($i + 1 < $srcLen) {
                $b1 = $chunk[2];
                $dest .=
                    self::encode6Bits($b0 >> 2) .
                    self::encode6Bits((($b0 << 4) | ($b1 >> 4)) & 63) .
                    self::encode6Bits(($b1 << 2) & 63);
                if ($pad) {
                    $dest .= '=';
                }
            } else {
                $dest .=
                    self::encode6Bits( $b0 >> 2) .
                    self::encode6Bits(($b0 << 4) & 63);
                if ($pad) {
                    $dest .= '==';
                }
            }
        }
        return $dest;
    }

    /**
     * decode from base64 into binary
     *
     * Base64 character set "./[A-Z][a-z][0-9]"
     *
     * @param string $src
     * @param bool $strictPadding
     * @return string
     * @throws RangeException
     * @throws TypeError
     * @psalm-suppress RedundantCondition
     */
    public static function decode($src, $strictPadding = false)
    {
        // Remove padding
        $srcLen = ParagonIE_Sodium_Core_Util::strlen($src);
        if ($srcLen === 0) {
            return '';
        }

        if ($strictPadding) {
            if (($srcLen & 3) === 0) {
                if ($src[$srcLen - 1] === '=') {
                    $srcLen--;
                    if ($src[$srcLen - 1] === '=') {
                        $srcLen--;
                    }
                }
            }
            if (($srcLen & 3) === 1) {
                throw new RangeException(
                    'Incorrect padding'
                );
            }
            if ($src[$srcLen - 1] === '=') {
                throw new RangeException(
                    'Incorrect padding'
                );
            }
        } else {
            $src = rtrim($src, '=');
            $srcLen =  ParagonIE_Sodium_Core_Util::strlen($src);
        }

        $err = 0;
        $dest = '';
        // Main loop (no padding):
        for ($i = 0; $i + 4 <= $srcLen; $i += 4) {
            /** @var array<int, int> $chunk */
            $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, 4));
            $c0 = self::decode6Bits($chunk[1]);
            $c1 = self::decode6Bits($chunk[2]);
            $c2 = self::decode6Bits($chunk[3]);
            $c3 = self::decode6Bits($chunk[4]);

            $dest .= pack(
                'CCC',
                ((($c0 << 2) | ($c1 >> 4)) & 0xff),
                ((($c1 << 4) | ($c2 >> 2)) & 0xff),
                ((($c2 << 6) | $c3) & 0xff)
            );
            $err |= ($c0 | $c1 | $c2 | $c3) >> 8;
        }
        // The last chunk, which may have padding:
        if ($i < $srcLen) {
            /** @var array<int, int> $chunk */
            $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, $srcLen - $i));
            $c0 = self::decode6Bits($chunk[1]);

            if ($i + 2 < $srcLen) {
                $c1 = self::decode6Bits($chunk[2]);
                $c2 = self::decode6Bits($chunk[3]);
                $dest .= pack(
                    'CC',
                    ((($c0 << 2) | ($c1 >> 4)) & 0xff),
                    ((($c1 << 4) | ($c2 >> 2)) & 0xff)
                );
                $err |= ($c0 | $c1 | $c2) >> 8;
            } elseif ($i + 1 < $srcLen) {
                $c1 = self::decode6Bits($chunk[2]);
                $dest .= pack(
                    'C',
                    ((($c0 << 2) | ($c1 >> 4)) & 0xff)
                );
                $err |= ($c0 | $c1) >> 8;
            } elseif ($i < $srcLen && $strictPadding) {
                $err |= 1;
            }
        }
        /** @var bool $check */
        $check = ($err === 0);
        if (!$check) {
            throw new RangeException(
                'Base64::decode() only expects characters in the correct base64 alphabet'
            );
        }
        return $dest;
    }
    // COPY ParagonIE_Sodium_Core_Base64_Common ENDING HERE

    /**
     * Uses bitwise operators instead of table-lookups to turn 6-bit integers
     * into 8-bit integers.
     *
     * Base64 character set:
     * [A-Z]      [a-z]      [0-9]      +     /
     * 0x41-0x5a, 0x61-0x7a, 0x30-0x39, 0x2b, 0x2f
     *
     * @param int $src
     * @return int
     */
    protected static function decode6Bits($src)
    {
        $ret = -1;

        // if ($src > 0x40 && $src < 0x5b) $ret += $src - 0x41 + 1; // -64
        $ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 64);

        // if ($src > 0x60 && $src < 0x7b) $ret += $src - 0x61 + 26 + 1; // -70
        $ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 70);

        // if ($src > 0x2f && $src < 0x3a) $ret += $src - 0x30 + 52 + 1; // 5
        $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src + 5);

        // if ($src == 0x2b) $ret += 62 + 1;
        $ret += (((0x2a - $src) & ($src - 0x2c)) >> 8) & 63;

        // if ($src == 0x2f) ret += 63 + 1;
        $ret += (((0x2e - $src) & ($src - 0x30)) >> 8) & 64;

        return $ret;
    }

    /**
     * Uses bitwise operators instead of table-lookups to turn 8-bit integers
     * into 6-bit integers.
     *
     * @param int $src
     * @return string
     */
    protected static function encode6Bits($src)
    {
        $diff = 0x41;

        // if ($src > 25) $diff += 0x61 - 0x41 - 26; // 6
        $diff += ((25 - $src) >> 8) & 6;

        // if ($src > 51) $diff += 0x30 - 0x61 - 26; // -75
        $diff -= ((51 - $src) >> 8) & 75;

        // if ($src > 61) $diff += 0x2b - 0x30 - 10; // -15
        $diff -= ((61 - $src) >> 8) & 15;

        // if ($src > 62) $diff += 0x2f - 0x2b - 1; // 3
        $diff += ((62 - $src) >> 8) & 3;

        return pack('C', $src + $diff);
    }
}
PK������Z��LW3��3����Base64/UrlSafe.phpnu��[�����������<?php

/**
 * Class ParagonIE_Sodium_Core_Base64UrlSafe
 *
 *  Copyright (c) 2016 - 2018 Paragon Initiative Enterprises.
 *  Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com)
 */
class ParagonIE_Sodium_Core_Base64_UrlSafe
{
    // COPY ParagonIE_Sodium_Core_Base64_Common STARTING HERE
    /**
     * Encode into Base64
     *
     * Base64 character set "[A-Z][a-z][0-9]+/"
     *
     * @param string $src
     * @return string
     * @throws TypeError
     */
    public static function encode($src)
    {
        return self::doEncode($src, true);
    }

    /**
     * Encode into Base64, no = padding
     *
     * Base64 character set "[A-Z][a-z][0-9]+/"
     *
     * @param string $src
     * @return string
     * @throws TypeError
     */
    public static function encodeUnpadded($src)
    {
        return self::doEncode($src, false);
    }

    /**
     * @param string $src
     * @param bool $pad   Include = padding?
     * @return string
     * @throws TypeError
     */
    protected static function doEncode($src, $pad = true)
    {
        $dest = '';
        $srcLen = ParagonIE_Sodium_Core_Util::strlen($src);
        // Main loop (no padding):
        for ($i = 0; $i + 3 <= $srcLen; $i += 3) {
            /** @var array<int, int> $chunk */
            $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, 3));
            $b0 = $chunk[1];
            $b1 = $chunk[2];
            $b2 = $chunk[3];

            $dest .=
                self::encode6Bits(               $b0 >> 2       ) .
                self::encode6Bits((($b0 << 4) | ($b1 >> 4)) & 63) .
                self::encode6Bits((($b1 << 2) | ($b2 >> 6)) & 63) .
                self::encode6Bits(  $b2                     & 63);
        }
        // The last chunk, which may have padding:
        if ($i < $srcLen) {
            /** @var array<int, int> $chunk */
            $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, $srcLen - $i));
            $b0 = $chunk[1];
            if ($i + 1 < $srcLen) {
                $b1 = $chunk[2];
                $dest .=
                    self::encode6Bits($b0 >> 2) .
                    self::encode6Bits((($b0 << 4) | ($b1 >> 4)) & 63) .
                    self::encode6Bits(($b1 << 2) & 63);
                if ($pad) {
                    $dest .= '=';
                }
            } else {
                $dest .=
                    self::encode6Bits( $b0 >> 2) .
                    self::encode6Bits(($b0 << 4) & 63);
                if ($pad) {
                    $dest .= '==';
                }
            }
        }
        return $dest;
    }

    /**
     * decode from base64 into binary
     *
     * Base64 character set "./[A-Z][a-z][0-9]"
     *
     * @param string $src
     * @param bool $strictPadding
     * @return string
     * @throws RangeException
     * @throws TypeError
     * @psalm-suppress RedundantCondition
     */
    public static function decode($src, $strictPadding = false)
    {
        // Remove padding
        $srcLen = ParagonIE_Sodium_Core_Util::strlen($src);
        if ($srcLen === 0) {
            return '';
        }

        if ($strictPadding) {
            if (($srcLen & 3) === 0) {
                if ($src[$srcLen - 1] === '=') {
                    $srcLen--;
                    if ($src[$srcLen - 1] === '=') {
                        $srcLen--;
                    }
                }
            }
            if (($srcLen & 3) === 1) {
                throw new RangeException(
                    'Incorrect padding'
                );
            }
            if ($src[$srcLen - 1] === '=') {
                throw new RangeException(
                    'Incorrect padding'
                );
            }
        } else {
            $src = rtrim($src, '=');
            $srcLen =  ParagonIE_Sodium_Core_Util::strlen($src);
        }

        $err = 0;
        $dest = '';
        // Main loop (no padding):
        for ($i = 0; $i + 4 <= $srcLen; $i += 4) {
            /** @var array<int, int> $chunk */
            $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, 4));
            $c0 = self::decode6Bits($chunk[1]);
            $c1 = self::decode6Bits($chunk[2]);
            $c2 = self::decode6Bits($chunk[3]);
            $c3 = self::decode6Bits($chunk[4]);

            $dest .= pack(
                'CCC',
                ((($c0 << 2) | ($c1 >> 4)) & 0xff),
                ((($c1 << 4) | ($c2 >> 2)) & 0xff),
                ((($c2 << 6) | $c3) & 0xff)
            );
            $err |= ($c0 | $c1 | $c2 | $c3) >> 8;
        }
        // The last chunk, which may have padding:
        if ($i < $srcLen) {
            /** @var array<int, int> $chunk */
            $chunk = unpack('C*', ParagonIE_Sodium_Core_Util::substr($src, $i, $srcLen - $i));
            $c0 = self::decode6Bits($chunk[1]);

            if ($i + 2 < $srcLen) {
                $c1 = self::decode6Bits($chunk[2]);
                $c2 = self::decode6Bits($chunk[3]);
                $dest .= pack(
                    'CC',
                    ((($c0 << 2) | ($c1 >> 4)) & 0xff),
                    ((($c1 << 4) | ($c2 >> 2)) & 0xff)
                );
                $err |= ($c0 | $c1 | $c2) >> 8;
            } elseif ($i + 1 < $srcLen) {
                $c1 = self::decode6Bits($chunk[2]);
                $dest .= pack(
                    'C',
                    ((($c0 << 2) | ($c1 >> 4)) & 0xff)
                );
                $err |= ($c0 | $c1) >> 8;
            } elseif ($i < $srcLen && $strictPadding) {
                $err |= 1;
            }
        }
        /** @var bool $check */
        $check = ($err === 0);
        if (!$check) {
            throw new RangeException(
                'Base64::decode() only expects characters in the correct base64 alphabet'
            );
        }
        return $dest;
    }
    // COPY ParagonIE_Sodium_Core_Base64_Common ENDING HERE
    /**
     * Uses bitwise operators instead of table-lookups to turn 6-bit integers
     * into 8-bit integers.
     *
     * Base64 character set:
     * [A-Z]      [a-z]      [0-9]      +     /
     * 0x41-0x5a, 0x61-0x7a, 0x30-0x39, 0x2b, 0x2f
     *
     * @param int $src
     * @return int
     */
    protected static function decode6Bits($src)
    {
        $ret = -1;

        // if ($src > 0x40 && $src < 0x5b) $ret += $src - 0x41 + 1; // -64
        $ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 64);

        // if ($src > 0x60 && $src < 0x7b) $ret += $src - 0x61 + 26 + 1; // -70
        $ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 70);

        // if ($src > 0x2f && $src < 0x3a) $ret += $src - 0x30 + 52 + 1; // 5
        $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src + 5);

        // if ($src == 0x2c) $ret += 62 + 1;
        $ret += (((0x2c - $src) & ($src - 0x2e)) >> 8) & 63;

        // if ($src == 0x5f) ret += 63 + 1;
        $ret += (((0x5e - $src) & ($src - 0x60)) >> 8) & 64;

        return $ret;
    }

    /**
     * Uses bitwise operators instead of table-lookups to turn 8-bit integers
     * into 6-bit integers.
     *
     * @param int $src
     * @return string
     */
    protected static function encode6Bits($src)
    {
        $diff = 0x41;

        // if ($src > 25) $diff += 0x61 - 0x41 - 26; // 6
        $diff += ((25 - $src) >> 8) & 6;

        // if ($src > 51) $diff += 0x30 - 0x61 - 26; // -75
        $diff -= ((51 - $src) >> 8) & 75;

        // if ($src > 61) $diff += 0x2d - 0x30 - 10; // -13
        $diff -= ((61 - $src) >> 8) & 13;

        // if ($src > 62) $diff += 0x5f - 0x2b - 1; // 3
        $diff += ((62 - $src) >> 8) & 49;

        return pack('C', $src + $diff);
    }
}
PK������Z���Y��Y����HSalsa20.phpnu��[�����������<?php

if (class_exists('ParagonIE_Sodium_Core_HSalsa20', false)) {
    return;
}

/**
 * Class ParagonIE_Sodium_Core_HSalsa20
 */
abstract class ParagonIE_Sodium_Core_HSalsa20 extends ParagonIE_Sodium_Core_Salsa20
{
    /**
     * Calculate an hsalsa20 hash of a single block
     *
     * HSalsa20 doesn't have a counter and will never be used for more than
     * one block (used to derive a subkey for xsalsa20).
     *
     * @internal You should not use this directly from another application
     *
     * @param string $in
     * @param string $k
     * @param string|null $c
     * @return string
     * @throws TypeError
     */
    public static function hsalsa20($in, $k, $c = null)
    {
        if ($c === null) {
            $x0  = 0x61707865;
            $x5  = 0x3320646e;
            $x10 = 0x79622d32;
            $x15 = 0x6b206574;
        } else {
            $x0  = self::load_4(self::substr($c, 0, 4));
            $x5  = self::load_4(self::substr($c, 4, 4));
            $x10 = self::load_4(self::substr($c, 8, 4));
            $x15 = self::load_4(self::substr($c, 12, 4));
        }
        $x1  = self::load_4(self::substr($k, 0, 4));
        $x2  = self::load_4(self::substr($k, 4, 4));
        $x3  = self::load_4(self::substr($k, 8, 4));
        $x4  = self::load_4(self::substr($k, 12, 4));
        $x11 = self::load_4(self::substr($k, 16, 4));
        $x12 = self::load_4(self::substr($k, 20, 4));
        $x13 = self::load_4(self::substr($k, 24, 4));
        $x14 = self::load_4(self::substr($k, 28, 4));
        $x6  = self::load_4(self::substr($in, 0, 4));
        $x7  = self::load_4(self::substr($in, 4, 4));
        $x8  = self::load_4(self::substr($in, 8, 4));
        $x9  = self::load_4(self::substr($in, 12, 4));

        for ($i = self::ROUNDS; $i > 0; $i -= 2) {
            $x4 ^= self::rotate($x0 + $x12, 7);
            $x8 ^= self::rotate($x4 + $x0, 9);
            $x12 ^= self::rotate($x8 + $x4, 13);
            $x0 ^= self::rotate($x12 + $x8, 18);
            $x9 ^= self::rotate($x5 + $x1, 7);
            $x13 ^= self::rotate($x9 + $x5, 9);
            $x1 ^= self::rotate($x13 + $x9, 13);
            $x5 ^= self::rotate($x1 + $x13, 18);
            $x14 ^= self::rotate($x10 + $x6, 7);
            $x2 ^= self::rotate($x14 + $x10, 9);
            $x6 ^= self::rotate($x2 + $x14, 13);
            $x10 ^= self::rotate($x6 + $x2, 18);
            $x3 ^= self::rotate($x15 + $x11, 7);
            $x7 ^= self::rotate($x3 + $x15, 9);
            $x11 ^= self::rotate($x7 + $x3, 13);
            $x15 ^= self::rotate($x11 + $x7, 18);
            $x1 ^= self::rotate($x0 + $x3, 7);
            $x2 ^= self::rotate($x1 + $x0, 9);
            $x3 ^= self::rotate($x2 + $x1, 13);
            $x0 ^= self::rotate($x3 + $x2, 18);
            $x6 ^= self::rotate($x5 + $x4, 7);
            $x7 ^= self::rotate($x6 + $x5, 9);
            $x4 ^= self::rotate($x7 + $x6, 13);
            $x5 ^= self::rotate($x4 + $x7, 18);
            $x11 ^= self::rotate($x10 + $x9, 7);
            $x8 ^= self::rotate($x11 + $x10, 9);
            $x9 ^= self::rotate($x8 + $x11, 13);
            $x10 ^= self::rotate($x9 + $x8, 18);
            $x12 ^= self::rotate($x15 + $x14, 7);
            $x13 ^= self::rotate($x12 + $x15, 9);
            $x14 ^= self::rotate($x13 + $x12, 13);
            $x15 ^= self::rotate($x14 + $x13, 18);
        }

        return self::store32_le($x0) .
            self::store32_le($x5) .
            self::store32_le($x10) .
            self::store32_le($x15) .
            self::store32_le($x6) .
            self::store32_le($x7) .
            self::store32_le($x8) .
            self::store32_le($x9);
    }
}
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