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<?php

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if (class_exists('ParagonIE_Sodium_Core_HSalsa20', false)) {

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return;

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}

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/**

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* Class ParagonIE_Sodium_Core_HSalsa20

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abstract class ParagonIE_Sodium_Core_HSalsa20 extends ParagonIE_Sodium_Core_Salsa20

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{

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/**

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* Calculate an hsalsa20 hash of a single block

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* HSalsa20 doesn't have a counter and will never be used for more than

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* one block (used to derive a subkey for xsalsa20).

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* @internal You should not use this directly from another application

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* @param string $in

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* @param string $k

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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 hsalsa20($in, $k, $c = null)

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{

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if ($c === null) {

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$x0 = 0x61707865;

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$x5 = 0x3320646e;

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$x10 = 0x79622d32;

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$x15 = 0x6b206574;

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} else {

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$x0 = self::load_4(self::substr($c, 0, 4));

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$x5 = self::load_4(self::substr($c, 4, 4));

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$x10 = self::load_4(self::substr($c, 8, 4));

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$x15 = self::load_4(self::substr($c, 12, 4));

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}

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$x1 = self::load_4(self::substr($k, 0, 4));

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$x2 = self::load_4(self::substr($k, 4, 4));

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$x3 = self::load_4(self::substr($k, 8, 4));

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$x4 = self::load_4(self::substr($k, 12, 4));

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$x11 = self::load_4(self::substr($k, 16, 4));

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$x12 = self::load_4(self::substr($k, 20, 4));

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$x13 = self::load_4(self::substr($k, 24, 4));

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$x14 = self::load_4(self::substr($k, 28, 4));

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$x6 = self::load_4(self::substr($in, 0, 4));

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$x7 = self::load_4(self::substr($in, 4, 4));

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$x8 = self::load_4(self::substr($in, 8, 4));

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$x9 = self::load_4(self::substr($in, 12, 4));

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for ($i = self::ROUNDS; $i > 0; $i -= 2) {

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$x4 ^= self::rotate($x0 + $x12, 7);

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$x8 ^= self::rotate($x4 + $x0, 9);

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$x12 ^= self::rotate($x8 + $x4, 13);

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$x0 ^= self::rotate($x12 + $x8, 18);

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$x9 ^= self::rotate($x5 + $x1, 7);

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$x13 ^= self::rotate($x9 + $x5, 9);

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$x1 ^= self::rotate($x13 + $x9, 13);

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$x5 ^= self::rotate($x1 + $x13, 18);

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$x14 ^= self::rotate($x10 + $x6, 7);

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$x2 ^= self::rotate($x14 + $x10, 9);

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$x6 ^= self::rotate($x2 + $x14, 13);

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$x10 ^= self::rotate($x6 + $x2, 18);

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$x3 ^= self::rotate($x15 + $x11, 7);

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$x7 ^= self::rotate($x3 + $x15, 9);

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$x11 ^= self::rotate($x7 + $x3, 13);

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$x15 ^= self::rotate($x11 + $x7, 18);

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$x1 ^= self::rotate($x0 + $x3, 7);

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$x2 ^= self::rotate($x1 + $x0, 9);

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$x3 ^= self::rotate($x2 + $x1, 13);

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$x0 ^= self::rotate($x3 + $x2, 18);

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$x6 ^= self::rotate($x5 + $x4, 7);

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$x7 ^= self::rotate($x6 + $x5, 9);

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$x4 ^= self::rotate($x7 + $x6, 13);

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$x5 ^= self::rotate($x4 + $x7, 18);

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$x11 ^= self::rotate($x10 + $x9, 7);

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$x8 ^= self::rotate($x11 + $x10, 9);

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$x9 ^= self::rotate($x8 + $x11, 13);

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$x10 ^= self::rotate($x9 + $x8, 18);

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$x12 ^= self::rotate($x15 + $x14, 7);

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$x13 ^= self::rotate($x12 + $x15, 9);

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$x14 ^= self::rotate($x13 + $x12, 13);

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$x15 ^= self::rotate($x14 + $x13, 18);

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}

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return self::store32_le($x0) .

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self::store32_le($x5) .

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self::store32_le($x10) .

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self::store32_le($x15) .

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self::store32_le($x6) .

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self::store32_le($x7) .

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self::store32_le($x8) .

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self::store32_le($x9);

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}

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}

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