/**
* Encrypt the selected node with the given key.
*
* @param XMLSecurityKey $objKey The encryption key and algorithm.
* @param bool $replace Whether the encrypted node should be replaced in the original tree. Default is TRUE.
* @return DOMElement The <xenc:EncryptedData>-element.
*/
public function encryptNode($objKey, $replace = TRUE)
{
$data = '';
if (empty($this->rawNode)) {
throw new Exception('Node to encrypt has not been set');
}
if (!$objKey instanceof XMLSecurityKey) {
throw new Exception('Invalid Key');
}
$doc = $this->rawNode->ownerDocument;
$xPath = new DOMXPath($this->encdoc);
$objList = $xPath->query('/xenc:EncryptedData/xenc:CipherData/xenc:CipherValue');
$cipherValue = $objList->item(0);
if ($cipherValue == NULL) {
throw new Exception('Error locating CipherValue element within template');
}
switch ($this->type) {
case XMLSecEnc::Element:
$data = $doc->saveXML($this->rawNode);
$this->encdoc->documentElement->setAttribute('Type', XMLSecEnc::Element);
break;
case XMLSecEnc::Content:
$children = $this->rawNode->childNodes;
foreach ($children as $child) {
$data .= $doc->saveXML($child);
}
$this->encdoc->documentElement->setAttribute('Type', XMLSecEnc::Content);
break;
default:
throw new Exception('Type is currently not supported');
}
$encMethod = $this->encdoc->documentElement->appendChild($this->encdoc->createElementNS(XMLSecEnc::XMLENCNS, 'xenc:EncryptionMethod'));
$encMethod->setAttribute('Algorithm', $objKey->getAlgorith());
$cipherValue->parentNode->parentNode->insertBefore($encMethod, $cipherValue->parentNode->parentNode->firstChild);
$strEncrypt = base64_encode($objKey->encryptData($data));
$value = $this->encdoc->createTextNode($strEncrypt);
$cipherValue->appendChild($value);
if ($replace) {
switch ($this->type) {
case XMLSecEnc::Element:
if ($this->rawNode->nodeType == XML_DOCUMENT_NODE) {
return $this->encdoc;
}
$importEnc = $this->rawNode->ownerDocument->importNode($this->encdoc->documentElement, TRUE);
$this->rawNode->parentNode->replaceChild($importEnc, $this->rawNode);
return $importEnc;
case XMLSecEnc::Content:
$importEnc = $this->rawNode->ownerDocument->importNode($this->encdoc->documentElement, TRUE);
while ($this->rawNode->firstChild) {
$this->rawNode->removeChild($this->rawNode->firstChild);
}
$this->rawNode->appendChild($importEnc);
return $importEnc;
}
} else {
return $this->encdoc->documentElement;
}
}
