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This adds a pure PHP implementation of the cryptographic functions supported in PHP 7.2+. It provides the necessary backwards compatibility required to support signature verification and other security features going forward across all supported PHP versions. Props paragoninitiativeenterprises Fixes #45806. See #39309. Built from https://develop.svn.wordpress.org/trunk@44953 git-svn-id: http://core.svn.wordpress.org/trunk@44784 1a063a9b-81f0-0310-95a4-ce76da25c4cd
128 lines
5.2 KiB
PHP
128 lines
5.2 KiB
PHP
<?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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*/
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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 $c
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* @return string
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* @throws SodiumException
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* @throws TypeError
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*/
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public static function hChaCha20($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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*/
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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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