HSalsa20.php in Automatic Updates 8

File

vendor/paragonie/sodium_compat/src/Core/HSalsa20.php

<?php

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);
  }

}

Classes

Name	Description
ParagonIE_Sodium_Core_HSalsa20	Class ParagonIE_Sodium_Core_HSalsa20