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<?php

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if (class_exists('ParagonIE_Sodium_Core_HChaCha20', false)) {

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return;

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}

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/**

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* Class ParagonIE_Sodium_Core_HChaCha20

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class ParagonIE_Sodium_Core_HChaCha20 extends ParagonIE_Sodium_Core_ChaCha20

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{

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/**

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* @param string $in

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* @param string $key

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* @param string|null $c

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* @return string

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* @throws TypeError

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public static function hChaCha20($in = '', $key = '', $c = null)

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{

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$ctx = array();

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if ($c === null) {

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$ctx[0] = 0x61707865;

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$ctx[1] = 0x3320646e;

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$ctx[2] = 0x79622d32;

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$ctx[3] = 0x6b206574;

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} else {

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$ctx[0] = self::load_4(self::substr($c, 0, 4));

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$ctx[1] = self::load_4(self::substr($c, 4, 4));

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$ctx[2] = self::load_4(self::substr($c, 8, 4));

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$ctx[3] = self::load_4(self::substr($c, 12, 4));

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}

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$ctx[4] = self::load_4(self::substr($key, 0, 4));

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$ctx[5] = self::load_4(self::substr($key, 4, 4));

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$ctx[6] = self::load_4(self::substr($key, 8, 4));

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$ctx[7] = self::load_4(self::substr($key, 12, 4));

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$ctx[8] = self::load_4(self::substr($key, 16, 4));

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$ctx[9] = self::load_4(self::substr($key, 20, 4));

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$ctx[10] = self::load_4(self::substr($key, 24, 4));

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$ctx[11] = self::load_4(self::substr($key, 28, 4));

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$ctx[12] = self::load_4(self::substr($in, 0, 4));

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$ctx[13] = self::load_4(self::substr($in, 4, 4));

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$ctx[14] = self::load_4(self::substr($in, 8, 4));

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$ctx[15] = self::load_4(self::substr($in, 12, 4));

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return self::hChaCha20Bytes($ctx);

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}

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/**

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* @param array $ctx

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* @return string

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* @throws TypeError

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protected static function hChaCha20Bytes(array $ctx)

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{

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$x0 = (int) $ctx[0];

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$x1 = (int) $ctx[1];

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$x2 = (int) $ctx[2];

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$x3 = (int) $ctx[3];

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$x4 = (int) $ctx[4];

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$x5 = (int) $ctx[5];

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$x6 = (int) $ctx[6];

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$x7 = (int) $ctx[7];

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$x8 = (int) $ctx[8];

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$x9 = (int) $ctx[9];

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$x10 = (int) $ctx[10];

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$x11 = (int) $ctx[11];

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$x12 = (int) $ctx[12];

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$x13 = (int) $ctx[13];

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$x14 = (int) $ctx[14];

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$x15 = (int) $ctx[15];

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for ($i = 0; $i < 10; ++$i) {

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# QUARTERROUND( x0, x4, x8, x12)

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list($x0, $x4, $x8, $x12) = self::quarterRound($x0, $x4, $x8, $x12);

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# QUARTERROUND( x1, x5, x9, x13)

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

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# QUARTERROUND( x2, x6, x10, x14)

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

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# QUARTERROUND( x3, x7, x11, x15)

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

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# QUARTERROUND( x0, x5, x10, x15)

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

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# QUARTERROUND( x1, x6, x11, x12)

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

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# QUARTERROUND( x2, x7, x8, x13)

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

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# QUARTERROUND( x3, x4, x9, x14)

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

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}

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return self::store32_le((int) ($x0 & 0xffffffff)) .

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self::store32_le((int) ($x1 & 0xffffffff)) .

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self::store32_le((int) ($x2 & 0xffffffff)) .

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self::store32_le((int) ($x3 & 0xffffffff)) .

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self::store32_le((int) ($x12 & 0xffffffff)) .

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self::store32_le((int) ($x13 & 0xffffffff)) .

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self::store32_le((int) ($x14 & 0xffffffff)) .

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self::store32_le((int) ($x15 & 0xffffffff));

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}

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}

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