protected function _mcrypt(array $config) {
		if (isset($config['cipher']) || isset($config['mode'])) {
			$message  = "You've selected a non-default cipher and/or mode configuration. ";
			$message .= "The Encrypt strategy is now in legacy mode and will use the ";
			$message .= "deprecated mcrypt extension. To disable legacy mode, use the strategy ";
			$message .= "with default configuration.";
			trigger_error($message, E_USER_DEPRECATED);

			return true;
		}
		if (!extension_loaded('openssl')) {
			$message .= "The Encrypt strategy is now in legacy mode and will use the ";
			$message .= "deprecated mcrypt extension. To disable legacy mode, install the ";
			$message .= "openssl extension.";
			trigger_error($message, E_USER_DEPRECATED);

			return true;
		}
		return false;
	}