<?php

if (class_exists('ParagonIE_Sodium_Core32_HSalsa20', false)) {
    return;
}
abstract class ParagonIE_Sodium_Core32_HSalsa20 extends ParagonIE_Sodium_Core32_Salsa20
{
    public static function hsalsa20($in, $k, $c = null)
    {
        if (self::strlen($k) < 32) {
            throw new RangeException('Key must be 32 bytes long');
        }
        if ($c === null) {
            $x0 = new ParagonIE_Sodium_Core32_Int32(array(0x6170, 0x7865));
            $x5 = new ParagonIE_Sodium_Core32_Int32(array(0x3320, 0x646e));
            $x10 = new ParagonIE_Sodium_Core32_Int32(array(0x7962, 0x2d32));
            $x15 = new ParagonIE_Sodium_Core32_Int32(array(0x6b20, 0x6574));
        } else {
            $x0 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 0, 4));
            $x5 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 4, 4));
            $x10 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 8, 4));
            $x15 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 12, 4));
        }
        $x1 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 0, 4));
        $x2 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 4, 4));
        $x3 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 8, 4));
        $x4 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 12, 4));
        $x6 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 0, 4));
        $x7 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 4, 4));
        $x8 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 8, 4));
        $x9 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 12, 4));
        $x11 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 16, 4));
        $x12 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 20, 4));
        $x13 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 24, 4));
        $x14 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 28, 4));
        for ($i = self::ROUNDS; $i > 0; $i -= 2) {
            $x4 = $x4->xorInt32($x0->addInt32($x12)->rotateLeft(7));
            $x8 = $x8->xorInt32($x4->addInt32($x0)->rotateLeft(9));
            $x12 = $x12->xorInt32($x8->addInt32($x4)->rotateLeft(13));
            $x0 = $x0->xorInt32($x12->addInt32($x8)->rotateLeft(18));
            $x9 = $x9->xorInt32($x5->addInt32($x1)->rotateLeft(7));
            $x13 = $x13->xorInt32($x9->addInt32($x5)->rotateLeft(9));
            $x1 = $x1->xorInt32($x13->addInt32($x9)->rotateLeft(13));
            $x5 = $x5->xorInt32($x1->addInt32($x13)->rotateLeft(18));
            $x14 = $x14->xorInt32($x10->addInt32($x6)->rotateLeft(7));
            $x2 = $x2->xorInt32($x14->addInt32($x10)->rotateLeft(9));
            $x6 = $x6->xorInt32($x2->addInt32($x14)->rotateLeft(13));
            $x10 = $x10->xorInt32($x6->addInt32($x2)->rotateLeft(18));
            $x3 = $x3->xorInt32($x15->addInt32($x11)->rotateLeft(7));
            $x7 = $x7->xorInt32($x3->addInt32($x15)->rotateLeft(9));
            $x11 = $x11->xorInt32($x7->addInt32($x3)->rotateLeft(13));
            $x15 = $x15->xorInt32($x11->addInt32($x7)->rotateLeft(18));
            $x1 = $x1->xorInt32($x0->addInt32($x3)->rotateLeft(7));
            $x2 = $x2->xorInt32($x1->addInt32($x0)->rotateLeft(9));
            $x3 = $x3->xorInt32($x2->addInt32($x1)->rotateLeft(13));
            $x0 = $x0->xorInt32($x3->addInt32($x2)->rotateLeft(18));
            $x6 = $x6->xorInt32($x5->addInt32($x4)->rotateLeft(7));
            $x7 = $x7->xorInt32($x6->addInt32($x5)->rotateLeft(9));
            $x4 = $x4->xorInt32($x7->addInt32($x6)->rotateLeft(13));
            $x5 = $x5->xorInt32($x4->addInt32($x7)->rotateLeft(18));
            $x11 = $x11->xorInt32($x10->addInt32($x9)->rotateLeft(7));
            $x8 = $x8->xorInt32($x11->addInt32($x10)->rotateLeft(9));
            $x9 = $x9->xorInt32($x8->addInt32($x11)->rotateLeft(13));
            $x10 = $x10->xorInt32($x9->addInt32($x8)->rotateLeft(18));
            $x12 = $x12->xorInt32($x15->addInt32($x14)->rotateLeft(7));
            $x13 = $x13->xorInt32($x12->addInt32($x15)->rotateLeft(9));
            $x14 = $x14->xorInt32($x13->addInt32($x12)->rotateLeft(13));
            $x15 = $x15->xorInt32($x14->addInt32($x13)->rotateLeft(18));
        }
        return $x0->toReverseString() . $x5->toReverseString() . $x10->toReverseString() . $x15->toReverseString() . $x6->toReverseString() . $x7->toReverseString() . $x8->toReverseString() . $x9->toReverseString();
    }
}