function aes_decrypt_old in Real AES 7

1 call to aes_decrypt_old()

aes.module in aes/aes.module

Enable to satisfy dependencies on aes.module.

File

aes/aes.module, line 158

Enable to satisfy dependencies on aes.module.

Code

function aes_decrypt_old($ciphertext, $base64encoded = TRUE, $custom_key = NULL, $custom_cipher = NULL, $custom_iv = NULL, $custom_implementation = NULL) {
  if ($base64encoded) {
    $string = base64_decode($ciphertext);
  }
  else {
    $string = $ciphertext;
  }

  // Bail out if the passed string is empty.
  if (empty($string)) {
    watchdog("aes", "Tried to decrypt an empty string.", array(), WATCHDOG_WARNING);
    return FALSE;
  }
  if ($custom_cipher != NULL) {
    $cipher = $custom_cipher;
  }
  else {
    $cipher = variable_get("aes_cipher", "rijndael-128");
  }
  if (!empty($custom_key)) {
    $key = $custom_key;
  }
  else {
    $key = aes_get_old_key();
  }
  if ($custom_implementation == "mcrypt" || $custom_implementation == "phpseclib") {
    $implementation = $custom_implementation;
  }
  else {
    $implementation = variable_get("aes_implementation", "mcrypt");
  }
  if ($implementation == "phpseclib") {

    // Using phpseclib implementation.
    // phpseclib doesn't support custom ciphers.
    if (is_null($custom_cipher) == FALSE) {
      watchdog("aes", "A custom cipher was defined when decrypting a string in the AES module using the phpseclib implementation. This implementation doesn't support custom ciphers therefore the argument was ignored and the decryption was done with the standard cipher.", array(), WATCHDOG_WARNING);
    }
    aes_load_phpsec();
    $phpsec = new Crypt_AES();
    $phpsec
      ->setKey($key);
    if (!is_null($custom_iv)) {
      $phpsec
        ->setIV(base64_decode($custom_iv));
    }
    $decrypted = $phpsec
      ->decrypt($string);
  }
  else {
    if ($implementation == "mcrypt") {

      // Using mcrypt implementation.
      $td = mcrypt_module_open_safe($cipher, "", MCRYPT_MODE_CBC, "");
      $ks = mcrypt_enc_get_key_size($td);
      if ($custom_iv == NULL) {
        $iv = base64_decode(variable_get("aes_encryption_iv", ""));
      }
      else {
        $iv = base64_decode($custom_iv);
      }
      if (empty($iv)) {
        watchdog("aes", "No initialization vector found while trying to decrypt. Aborting!", array(), WATCHDOG_ERROR);
      }
      $key = substr(sha1($key), 0, $ks);
      mcrypt_generic_init($td, $key, $iv);
      $decrypted = mdecrypt_generic($td, $string);
      mcrypt_generic_deinit($td);
      mcrypt_module_close($td);
    }
    else {
      $error_msg = t("Request was sent to decrypt a string with the AES module, but the AES module has no active encryption implementation to work with! Did you forget to run update.php after upgrading this module?");
      if (user_access('administer aes')) {
        drupal_set_message($error_msg, "error");
      }
      watchdog("aes", $error_msg, array(), WATCHDOG_ERROR);
      return FALSE;
    }
  }
  return trim($decrypted);
}