File "SipHash.php"

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<?php

if (class_exists('ParagonIE_Sodium_Core32_SipHash', false)) {
    return;
}
class ParagonIE_Sodium_Core32_SipHash extends ParagonIE_Sodium_Core32_Util
{
    public static function sipRound(array $v)
    {
        $v[0] = $v[0]->addInt64($v[1]);
        $v[1] = $v[1]->rotateLeft(13);
        $v[1] = $v[1]->xorInt64($v[0]);
        $v[0] = $v[0]->rotateLeft(32);
        $v[2] = $v[2]->addInt64($v[3]);
        $v[3] = $v[3]->rotateLeft(16);
        $v[3] = $v[3]->xorInt64($v[2]);
        $v[0] = $v[0]->addInt64($v[3]);
        $v[3] = $v[3]->rotateLeft(21);
        $v[3] = $v[3]->xorInt64($v[0]);
        $v[2] = $v[2]->addInt64($v[1]);
        $v[1] = $v[1]->rotateLeft(17);
        $v[1] = $v[1]->xorInt64($v[2]);
        $v[2] = $v[2]->rotateLeft(32);
        return $v;
    }
    public static function sipHash24($in, $key)
    {
        $inlen = self::strlen($in);
        $v = array(new ParagonIE_Sodium_Core32_Int64(array(0x736f, 0x6d65, 0x7073, 0x6575)), new ParagonIE_Sodium_Core32_Int64(array(0x646f, 0x7261, 0x6e64, 0x6f6d)), new ParagonIE_Sodium_Core32_Int64(array(0x6c79, 0x6765, 0x6e65, 0x7261)), new ParagonIE_Sodium_Core32_Int64(array(0x7465, 0x6462, 0x7974, 0x6573)));
        $k = array(ParagonIE_Sodium_Core32_Int64::fromReverseString(self::substr($key, 0, 8)), ParagonIE_Sodium_Core32_Int64::fromReverseString(self::substr($key, 8, 8)));
        $b = new ParagonIE_Sodium_Core32_Int64(array($inlen << 8 & 0xffff, 0, 0, 0));
        $v[3] = $v[3]->xorInt64($k[1]);
        $v[2] = $v[2]->xorInt64($k[0]);
        $v[1] = $v[1]->xorInt64($k[1]);
        $v[0] = $v[0]->xorInt64($k[0]);
        $left = $inlen;
        while ($left >= 8) {
            $m = ParagonIE_Sodium_Core32_Int64::fromReverseString(self::substr($in, 0, 8));
            $v[3] = $v[3]->xorInt64($m);
            $v = self::sipRound($v);
            $v = self::sipRound($v);
            $v[0] = $v[0]->xorInt64($m);
            $in = self::substr($in, 8);
            $left -= 8;
        }
        switch ($left) {
            case 7:
                $b = $b->orInt64(ParagonIE_Sodium_Core32_Int64::fromInts(0, self::chrToInt($in[6]) << 16));
            case 6:
                $b = $b->orInt64(ParagonIE_Sodium_Core32_Int64::fromInts(0, self::chrToInt($in[5]) << 8));
            case 5:
                $b = $b->orInt64(ParagonIE_Sodium_Core32_Int64::fromInts(0, self::chrToInt($in[4])));
            case 4:
                $b = $b->orInt64(ParagonIE_Sodium_Core32_Int64::fromInts(self::chrToInt($in[3]) << 24, 0));
            case 3:
                $b = $b->orInt64(ParagonIE_Sodium_Core32_Int64::fromInts(self::chrToInt($in[2]) << 16, 0));
            case 2:
                $b = $b->orInt64(ParagonIE_Sodium_Core32_Int64::fromInts(self::chrToInt($in[1]) << 8, 0));
            case 1:
                $b = $b->orInt64(ParagonIE_Sodium_Core32_Int64::fromInts(self::chrToInt($in[0]), 0));
            case 0:
                break;
        }
        $v[3] = $v[3]->xorInt64($b);
        $v = self::sipRound($v);
        $v = self::sipRound($v);
        $v[0] = $v[0]->xorInt64($b);
        $v[2]->limbs[3] ^= 0xff;
        $v = self::sipRound($v);
        $v = self::sipRound($v);
        $v = self::sipRound($v);
        $v = self::sipRound($v);
        return $v[0]->xorInt64($v[1])->xorInt64($v[2])->xorInt64($v[3])->toReverseString();
    }
}