File "ChaCha20.php"

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<?php

if (class_exists('ParagonIE_Sodium_Core32_ChaCha20', false)) {
    return;
}
class ParagonIE_Sodium_Core32_ChaCha20 extends ParagonIE_Sodium_Core32_Util
{
    protected static function quarterRound(ParagonIE_Sodium_Core32_Int32 $a, ParagonIE_Sodium_Core32_Int32 $b, ParagonIE_Sodium_Core32_Int32 $c, ParagonIE_Sodium_Core32_Int32 $d)
    {
        $a = $a->addInt32($b);
        $d = $d->xorInt32($a)->rotateLeft(16);
        $c = $c->addInt32($d);
        $b = $b->xorInt32($c)->rotateLeft(12);
        $a = $a->addInt32($b);
        $d = $d->xorInt32($a)->rotateLeft(8);
        $c = $c->addInt32($d);
        $b = $b->xorInt32($c)->rotateLeft(7);
        return array($a, $b, $c, $d);
    }
    public static function encryptBytes(ParagonIE_Sodium_Core32_ChaCha20_Ctx $ctx, $message = '')
    {
        $bytes = self::strlen($message);
        $j0 = $ctx[0];
        $j1 = $ctx[1];
        $j2 = $ctx[2];
        $j3 = $ctx[3];
        $j4 = $ctx[4];
        $j5 = $ctx[5];
        $j6 = $ctx[6];
        $j7 = $ctx[7];
        $j8 = $ctx[8];
        $j9 = $ctx[9];
        $j10 = $ctx[10];
        $j11 = $ctx[11];
        $j12 = $ctx[12];
        $j13 = $ctx[13];
        $j14 = $ctx[14];
        $j15 = $ctx[15];
        $c = '';
        for (;;) {
            if ($bytes < 64) {
                $message .= str_repeat("\0", 64 - $bytes);
            }
            $x0 = clone $j0;
            $x1 = clone $j1;
            $x2 = clone $j2;
            $x3 = clone $j3;
            $x4 = clone $j4;
            $x5 = clone $j5;
            $x6 = clone $j6;
            $x7 = clone $j7;
            $x8 = clone $j8;
            $x9 = clone $j9;
            $x10 = clone $j10;
            $x11 = clone $j11;
            $x12 = clone $j12;
            $x13 = clone $j13;
            $x14 = clone $j14;
            $x15 = clone $j15;
            for ($i = 20; $i > 0; $i -= 2) {
                list($x0, $x4, $x8, $x12) = self::quarterRound($x0, $x4, $x8, $x12);
                list($x1, $x5, $x9, $x13) = self::quarterRound($x1, $x5, $x9, $x13);
                list($x2, $x6, $x10, $x14) = self::quarterRound($x2, $x6, $x10, $x14);
                list($x3, $x7, $x11, $x15) = self::quarterRound($x3, $x7, $x11, $x15);
                list($x0, $x5, $x10, $x15) = self::quarterRound($x0, $x5, $x10, $x15);
                list($x1, $x6, $x11, $x12) = self::quarterRound($x1, $x6, $x11, $x12);
                list($x2, $x7, $x8, $x13) = self::quarterRound($x2, $x7, $x8, $x13);
                list($x3, $x4, $x9, $x14) = self::quarterRound($x3, $x4, $x9, $x14);
            }
            $x0 = $x0->addInt32($j0);
            $x1 = $x1->addInt32($j1);
            $x2 = $x2->addInt32($j2);
            $x3 = $x3->addInt32($j3);
            $x4 = $x4->addInt32($j4);
            $x5 = $x5->addInt32($j5);
            $x6 = $x6->addInt32($j6);
            $x7 = $x7->addInt32($j7);
            $x8 = $x8->addInt32($j8);
            $x9 = $x9->addInt32($j9);
            $x10 = $x10->addInt32($j10);
            $x11 = $x11->addInt32($j11);
            $x12 = $x12->addInt32($j12);
            $x13 = $x13->addInt32($j13);
            $x14 = $x14->addInt32($j14);
            $x15 = $x15->addInt32($j15);
            $x0 = $x0->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 0, 4)));
            $x1 = $x1->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 4, 4)));
            $x2 = $x2->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 8, 4)));
            $x3 = $x3->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 12, 4)));
            $x4 = $x4->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 16, 4)));
            $x5 = $x5->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 20, 4)));
            $x6 = $x6->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 24, 4)));
            $x7 = $x7->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 28, 4)));
            $x8 = $x8->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 32, 4)));
            $x9 = $x9->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 36, 4)));
            $x10 = $x10->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 40, 4)));
            $x11 = $x11->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 44, 4)));
            $x12 = $x12->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 48, 4)));
            $x13 = $x13->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 52, 4)));
            $x14 = $x14->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 56, 4)));
            $x15 = $x15->xorInt32(ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 60, 4)));
            $j12 = $j12->addInt(1);
            if ($j12->limbs[0] === 0 && $j12->limbs[1] === 0) {
                $j13 = $j13->addInt(1);
            }
            $block = $x0->toReverseString() . $x1->toReverseString() . $x2->toReverseString() . $x3->toReverseString() . $x4->toReverseString() . $x5->toReverseString() . $x6->toReverseString() . $x7->toReverseString() . $x8->toReverseString() . $x9->toReverseString() . $x10->toReverseString() . $x11->toReverseString() . $x12->toReverseString() . $x13->toReverseString() . $x14->toReverseString() . $x15->toReverseString();
            if ($bytes < 64) {
                $c .= self::substr($block, 0, $bytes);
                break;
            }
            $c .= $block;
            $bytes -= 64;
            if ($bytes <= 0) {
                break;
            }
            $message = self::substr($message, 64);
        }
        $ctx[12] = $j12;
        $ctx[13] = $j13;
        return $c;
    }
    public static function stream($len = 64, $nonce = '', $key = '')
    {
        return self::encryptBytes(new ParagonIE_Sodium_Core32_ChaCha20_Ctx($key, $nonce), str_repeat("\0", $len));
    }
    public static function ietfStream($len, $nonce = '', $key = '')
    {
        return self::encryptBytes(new ParagonIE_Sodium_Core32_ChaCha20_IetfCtx($key, $nonce), str_repeat("\0", $len));
    }
    public static function ietfStreamXorIc($message, $nonce = '', $key = '', $ic = '')
    {
        return self::encryptBytes(new ParagonIE_Sodium_Core32_ChaCha20_IetfCtx($key, $nonce, $ic), $message);
    }
    public static function streamXorIc($message, $nonce = '', $key = '', $ic = '')
    {
        return self::encryptBytes(new ParagonIE_Sodium_Core32_ChaCha20_Ctx($key, $nonce, $ic), $message);
    }
}