HChaCha20.php in Automatic Updates 7

File

vendor/paragonie/sodium_compat/src/Core/HChaCha20.php

<?php

if (class_exists('ParagonIE_Sodium_Core_HChaCha20', false)) {
  return;
}

/**
 * Class ParagonIE_Sodium_Core_HChaCha20
 */
class ParagonIE_Sodium_Core_HChaCha20 extends ParagonIE_Sodium_Core_ChaCha20 {

  /**
   * @param string $in
   * @param string $key
   * @param string|null $c
   * @return string
   * @throws TypeError
   */
  public static function hChaCha20($in = '', $key = '', $c = null) {
    $ctx = array();
    if ($c === null) {
      $ctx[0] = 0x61707865;
      $ctx[1] = 0x3320646e;
      $ctx[2] = 0x79622d32;
      $ctx[3] = 0x6b206574;
    }
    else {
      $ctx[0] = self::load_4(self::substr($c, 0, 4));
      $ctx[1] = self::load_4(self::substr($c, 4, 4));
      $ctx[2] = self::load_4(self::substr($c, 8, 4));
      $ctx[3] = self::load_4(self::substr($c, 12, 4));
    }
    $ctx[4] = self::load_4(self::substr($key, 0, 4));
    $ctx[5] = self::load_4(self::substr($key, 4, 4));
    $ctx[6] = self::load_4(self::substr($key, 8, 4));
    $ctx[7] = self::load_4(self::substr($key, 12, 4));
    $ctx[8] = self::load_4(self::substr($key, 16, 4));
    $ctx[9] = self::load_4(self::substr($key, 20, 4));
    $ctx[10] = self::load_4(self::substr($key, 24, 4));
    $ctx[11] = self::load_4(self::substr($key, 28, 4));
    $ctx[12] = self::load_4(self::substr($in, 0, 4));
    $ctx[13] = self::load_4(self::substr($in, 4, 4));
    $ctx[14] = self::load_4(self::substr($in, 8, 4));
    $ctx[15] = self::load_4(self::substr($in, 12, 4));
    return self::hChaCha20Bytes($ctx);
  }

  /**
   * @param array $ctx
   * @return string
   * @throws TypeError
   */
  protected static function hChaCha20Bytes(array $ctx) {
    $x0 = (int) $ctx[0];
    $x1 = (int) $ctx[1];
    $x2 = (int) $ctx[2];
    $x3 = (int) $ctx[3];
    $x4 = (int) $ctx[4];
    $x5 = (int) $ctx[5];
    $x6 = (int) $ctx[6];
    $x7 = (int) $ctx[7];
    $x8 = (int) $ctx[8];
    $x9 = (int) $ctx[9];
    $x10 = (int) $ctx[10];
    $x11 = (int) $ctx[11];
    $x12 = (int) $ctx[12];
    $x13 = (int) $ctx[13];
    $x14 = (int) $ctx[14];
    $x15 = (int) $ctx[15];
    for ($i = 0; $i < 10; ++$i) {

      # QUARTERROUND( x0,  x4,  x8,  x12)
      list($x0, $x4, $x8, $x12) = self::quarterRound($x0, $x4, $x8, $x12);

      # QUARTERROUND( x1,  x5,  x9,  x13)
      list($x1, $x5, $x9, $x13) = self::quarterRound($x1, $x5, $x9, $x13);

      # QUARTERROUND( x2,  x6,  x10,  x14)
      list($x2, $x6, $x10, $x14) = self::quarterRound($x2, $x6, $x10, $x14);

      # QUARTERROUND( x3,  x7,  x11,  x15)
      list($x3, $x7, $x11, $x15) = self::quarterRound($x3, $x7, $x11, $x15);

      # QUARTERROUND( x0,  x5,  x10,  x15)
      list($x0, $x5, $x10, $x15) = self::quarterRound($x0, $x5, $x10, $x15);

      # QUARTERROUND( x1,  x6,  x11,  x12)
      list($x1, $x6, $x11, $x12) = self::quarterRound($x1, $x6, $x11, $x12);

      # QUARTERROUND( x2,  x7,  x8,  x13)
      list($x2, $x7, $x8, $x13) = self::quarterRound($x2, $x7, $x8, $x13);

      # QUARTERROUND( x3,  x4,  x9,  x14)
      list($x3, $x4, $x9, $x14) = self::quarterRound($x3, $x4, $x9, $x14);
    }
    return self::store32_le((int) ($x0 & 0xffffffff)) . self::store32_le((int) ($x1 & 0xffffffff)) . self::store32_le((int) ($x2 & 0xffffffff)) . self::store32_le((int) ($x3 & 0xffffffff)) . self::store32_le((int) ($x12 & 0xffffffff)) . self::store32_le((int) ($x13 & 0xffffffff)) . self::store32_le((int) ($x14 & 0xffffffff)) . self::store32_le((int) ($x15 & 0xffffffff));
  }

}

Classes

Name	Description
ParagonIE_Sodium_Core_HChaCha20	Class ParagonIE_Sodium_Core_HChaCha20