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| if (class_exists('ParagonIE_Sodium_Core_HSalsa20', false)) { | |
| return; | |
| } | |
| /** | |
| * Class ParagonIE_Sodium_Core_HSalsa20 | |
| */ | |
| abstract class ParagonIE_Sodium_Core_HSalsa20 extends ParagonIE_Sodium_Core_Salsa20 | |
| { | |
| /** | |
| * Calculate an hsalsa20 hash of a single block | |
| * | |
| * HSalsa20 doesn't have a counter and will never be used for more than | |
| * one block (used to derive a subkey for xsalsa20). | |
| * | |
| * @internal You should not use this directly from another application | |
| * | |
| * @param string $in | |
| * @param string $k | |
| * @param string|null $c | |
| * @return string | |
| * @throws TypeError | |
| */ | |
| public static function hsalsa20($in, $k, $c = null) | |
| { | |
| if ($c === null) { | |
| $x0 = 0x61707865; | |
| $x5 = 0x3320646e; | |
| $x10 = 0x79622d32; | |
| $x15 = 0x6b206574; | |
| } else { | |
| $x0 = self::load_4(self::substr($c, 0, 4)); | |
| $x5 = self::load_4(self::substr($c, 4, 4)); | |
| $x10 = self::load_4(self::substr($c, 8, 4)); | |
| $x15 = self::load_4(self::substr($c, 12, 4)); | |
| } | |
| $x1 = self::load_4(self::substr($k, 0, 4)); | |
| $x2 = self::load_4(self::substr($k, 4, 4)); | |
| $x3 = self::load_4(self::substr($k, 8, 4)); | |
| $x4 = self::load_4(self::substr($k, 12, 4)); | |
| $x11 = self::load_4(self::substr($k, 16, 4)); | |
| $x12 = self::load_4(self::substr($k, 20, 4)); | |
| $x13 = self::load_4(self::substr($k, 24, 4)); | |
| $x14 = self::load_4(self::substr($k, 28, 4)); | |
| $x6 = self::load_4(self::substr($in, 0, 4)); | |
| $x7 = self::load_4(self::substr($in, 4, 4)); | |
| $x8 = self::load_4(self::substr($in, 8, 4)); | |
| $x9 = self::load_4(self::substr($in, 12, 4)); | |
| for ($i = self::ROUNDS; $i > 0; $i -= 2) { | |
| $x4 ^= self::rotate($x0 + $x12, 7); | |
| $x8 ^= self::rotate($x4 + $x0, 9); | |
| $x12 ^= self::rotate($x8 + $x4, 13); | |
| $x0 ^= self::rotate($x12 + $x8, 18); | |
| $x9 ^= self::rotate($x5 + $x1, 7); | |
| $x13 ^= self::rotate($x9 + $x5, 9); | |
| $x1 ^= self::rotate($x13 + $x9, 13); | |
| $x5 ^= self::rotate($x1 + $x13, 18); | |
| $x14 ^= self::rotate($x10 + $x6, 7); | |
| $x2 ^= self::rotate($x14 + $x10, 9); | |
| $x6 ^= self::rotate($x2 + $x14, 13); | |
| $x10 ^= self::rotate($x6 + $x2, 18); | |
| $x3 ^= self::rotate($x15 + $x11, 7); | |
| $x7 ^= self::rotate($x3 + $x15, 9); | |
| $x11 ^= self::rotate($x7 + $x3, 13); | |
| $x15 ^= self::rotate($x11 + $x7, 18); | |
| $x1 ^= self::rotate($x0 + $x3, 7); | |
| $x2 ^= self::rotate($x1 + $x0, 9); | |
| $x3 ^= self::rotate($x2 + $x1, 13); | |
| $x0 ^= self::rotate($x3 + $x2, 18); | |
| $x6 ^= self::rotate($x5 + $x4, 7); | |
| $x7 ^= self::rotate($x6 + $x5, 9); | |
| $x4 ^= self::rotate($x7 + $x6, 13); | |
| $x5 ^= self::rotate($x4 + $x7, 18); | |
| $x11 ^= self::rotate($x10 + $x9, 7); | |
| $x8 ^= self::rotate($x11 + $x10, 9); | |
| $x9 ^= self::rotate($x8 + $x11, 13); | |
| $x10 ^= self::rotate($x9 + $x8, 18); | |
| $x12 ^= self::rotate($x15 + $x14, 7); | |
| $x13 ^= self::rotate($x12 + $x15, 9); | |
| $x14 ^= self::rotate($x13 + $x12, 13); | |
| $x15 ^= self::rotate($x14 + $x13, 18); | |
| } | |
| return self::store32_le($x0) . | |
| self::store32_le($x5) . | |
| self::store32_le($x10) . | |
| self::store32_le($x15) . | |
| self::store32_le($x6) . | |
| self::store32_le($x7) . | |
| self::store32_le($x8) . | |
| self::store32_le($x9); | |
| } | |
| } | |