/**
* override constructor to force class use known IVs
*
* @param string $key encryption key
* @param string $iv feed a known IV
* @param string $mode mcrypt mode
* @param string $cipher mcrypt cipher
*/
public function __construct($key, $iv, $mode, $cipher)
{
parent::__construct($key, $mode, $cipher);
$this->_iv = $iv;
}
