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<?php

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if (class_exists('ParagonIE_Sodium_Core32_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_Core32_HChaCha20 extends ParagonIE_Sodium_Core32_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 SodiumException

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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] = new ParagonIE_Sodium_Core32_Int32(array(0x6170, 0x7865));

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$ctx[1] = new ParagonIE_Sodium_Core32_Int32(array(0x3320, 0x646e));

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$ctx[2] = new ParagonIE_Sodium_Core32_Int32(array(0x7962, 0x2d32));

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$ctx[3] = new ParagonIE_Sodium_Core32_Int32(array(0x6b20, 0x6574));

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} else {

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$ctx[0] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 0, 4));

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$ctx[1] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 4, 4));

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$ctx[2] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 8, 4));

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$ctx[3] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 12, 4));

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}

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$ctx[4] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 0, 4));

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$ctx[5] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 4, 4));

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$ctx[6] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 8, 4));

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$ctx[7] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 12, 4));

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$ctx[8] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 16, 4));

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$ctx[9] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 20, 4));

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$ctx[10] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 24, 4));

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$ctx[11] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 28, 4));

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$ctx[12] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 0, 4));

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$ctx[13] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 4, 4));

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$ctx[14] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 8, 4));

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$ctx[15] = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($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 SodiumException

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* @throws TypeError

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protected static function hChaCha20Bytes(array $ctx)

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{

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/** @var ParagonIE_Sodium_Core32_Int32 $x0 */

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$x0 = $ctx[0];

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/** @var ParagonIE_Sodium_Core32_Int32 $x1 */

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$x1 = $ctx[1];

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/** @var ParagonIE_Sodium_Core32_Int32 $x2 */

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$x2 = $ctx[2];

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/** @var ParagonIE_Sodium_Core32_Int32 $x3 */

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$x3 = $ctx[3];

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/** @var ParagonIE_Sodium_Core32_Int32 $x4 */

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$x4 = $ctx[4];

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/** @var ParagonIE_Sodium_Core32_Int32 $x5 */

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$x5 = $ctx[5];

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/** @var ParagonIE_Sodium_Core32_Int32 $x6 */

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$x6 = $ctx[6];

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/** @var ParagonIE_Sodium_Core32_Int32 $x7 */

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$x7 = $ctx[7];

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/** @var ParagonIE_Sodium_Core32_Int32 $x8 */

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$x8 = $ctx[8];

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/** @var ParagonIE_Sodium_Core32_Int32 $x9 */

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$x9 = $ctx[9];

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/** @var ParagonIE_Sodium_Core32_Int32 $x10 */

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$x10 = $ctx[10];

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/** @var ParagonIE_Sodium_Core32_Int32 $x11 */

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$x11 = $ctx[11];

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/** @var ParagonIE_Sodium_Core32_Int32 $x12 */

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$x12 = $ctx[12];

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/** @var ParagonIE_Sodium_Core32_Int32 $x13 */

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$x13 = $ctx[13];

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/** @var ParagonIE_Sodium_Core32_Int32 $x14 */

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$x14 = $ctx[14];

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/** @var ParagonIE_Sodium_Core32_Int32 $x15 */

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$x15 = $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 $x0->toReverseString() .

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$x1->toReverseString() .

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$x2->toReverseString() .

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$x3->toReverseString() .

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$x12->toReverseString() .

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$x13->toReverseString() .

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$x14->toReverseString() .

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$x15->toReverseString();

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}

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}

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