/**
* Encrypt the XMLSecurityKey
*
* @param XMLSecurityKey $srcKey
* @param XMLSecurityKey $rawKey
* @param bool $append
* @throws Exception
*/
public function encryptKey($srcKey, $rawKey, $append = true)
{
if (!$srcKey instanceof XMLSecurityKey || !$rawKey instanceof XMLSecurityKey) {
throw new Exception('Invalid Key');
}
$strEncKey = base64_encode($srcKey->encryptData($rawKey->key));
$root = $this->encdoc->documentElement;
$encKey = $this->encdoc->createElementNS(self::XMLENCNS, 'xenc:EncryptedKey');
if ($append) {
$keyInfo = $root->insertBefore($this->encdoc->createElementNS('http://www.w3.org/2000/09/xmldsig#', 'dsig:KeyInfo'), $root->firstChild);
$keyInfo->appendChild($encKey);
} else {
$this->encKey = $encKey;
}
$encMethod = $encKey->appendChild($this->encdoc->createElementNS(self::XMLENCNS, 'xenc:EncryptionMethod'));
$encMethod->setAttribute('Algorithm', $srcKey->getAlgorith());
if (!empty($srcKey->name)) {
$keyInfo = $encKey->appendChild($this->encdoc->createElementNS('http://www.w3.org/2000/09/xmldsig#', 'dsig:KeyInfo'));
$keyInfo->appendChild($this->encdoc->createElementNS('http://www.w3.org/2000/09/xmldsig#', 'dsig:KeyName', $srcKey->name));
}
$cipherData = $encKey->appendChild($this->encdoc->createElementNS(self::XMLENCNS, 'xenc:CipherData'));
$cipherData->appendChild($this->encdoc->createElementNS(self::XMLENCNS, 'xenc:CipherValue', $strEncKey));
if (is_array($this->references) && count($this->references) > 0) {
$refList = $encKey->appendChild($this->encdoc->createElementNS(self::XMLENCNS, 'xenc:ReferenceList'));
foreach ($this->references as $name => $reference) {
$refuri = $reference["refuri"];
$dataRef = $refList->appendChild($this->encdoc->createElementNS(self::XMLENCNS, 'xenc:DataReference'));
$dataRef->setAttribute("URI", '#' . $refuri);
}
}
return;
}
/**
* 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 self::Element:
$data = $doc->saveXML($this->rawNode);
$this->encdoc->documentElement->setAttribute('Type', self::Element);
break;
case self::Content:
$children = $this->rawNode->childNodes;
foreach ($children as $child) {
$data .= $doc->saveXML($child);
}
$this->encdoc->documentElement->setAttribute('Type', self::Content);
break;
default:
throw new Exception('Type is currently not supported');
}
$encMethod = $this->encdoc->documentElement->appendChild($this->encdoc->createElementNS(self::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 self::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 self::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;
}
}
