/**
* adds the element <crypt> into the stream if it has no element <crypt> already, do nothing otherwise
*
* @param XMLElement $order
*/
public function addCrypt(SceauControl &$order)
{
$crypt = $order->getOneElementByTagName('crypt');
if (is_null($crypt)) {
$order->createChild('crypt', $this->generateCrypt($order), array());
} else {
$crypt->nodeValue = $this->generateCrypt($order);
}
}
