* @see Crypt_Base::Crypt_Base()
* @see Crypt_Base::setPreferredEngine()
function setPreferredEngine($engine)
$this->des[0]->setPreferredEngine($engine);
$this->des[1]->setPreferredEngine($engine);
$this->des[2]->setPreferredEngine($engine);
return parent::setPreferredEngine($engine);