RobRichards\WsePhp\WSSESoap::encryptSoapDoc PHP Method

    public function encryptSoapDoc($siteKey, $objKey, $options = null, $encryptSignature = true)
    {
        $enc = new XMLSecEnc();
        $xpath = new DOMXPath($this->envelope->ownerDocument);
        if ($encryptSignature == false) {
            $nodes = $xpath->query('//*[local-name()="Body"]');
        } else {
            $nodes = $xpath->query('//*[local-name()="Signature"] | //*[local-name()="Body"]');
        }
        foreach ($nodes as $node) {
            $type = XMLSecEnc::Element;
            $name = $node->localName;
            if ($name == 'Body') {
                $type = XMLSecEnc::Content;
            }
            $enc->addReference($name, $node, $type);
        }
        $enc->encryptReferences($objKey);
        $enc->encryptKey($siteKey, $objKey, false);
        $nodes = $xpath->query('//*[local-name()="Security"]');
        $signode = $nodes->item(0);
        $this->addEncryptedKey($signode, $enc, $siteKey, $options);
    }

 public function __doRequest($request, $location, $saction, $version)
 {
     $doc = new DOMDocument('1.0');
     $doc->loadXML($request);
     $objWSSE = new WSSESoap($doc);
     /* add Timestamp with no expiration timestamp */
     $objWSSE->addTimestamp();
     /* create new XMLSec Key using AES256_CBC and type is private key */
     $objKey = new XMLSecurityKey(XMLSecurityKey::RSA_SHA1, array('type' => 'private'));
     /* load the private key from file - last arg is bool if key in file (true) or is string (false) */
     $objKey->loadKey(PRIVATE_KEY, true);
     /* Sign the message - also signs appropiate WS-Security items */
     $options = array("insertBefore" => false);
     $objWSSE->signSoapDoc($objKey, $options);
     /* Add certificate (BinarySecurityToken) to the message */
     $token = $objWSSE->addBinaryToken(file_get_contents(CERT_FILE));
     /* Attach pointer to Signature */
     $objWSSE->attachTokentoSig($token);
     $objKey = new XMLSecurityKey(XMLSecurityKey::AES256_CBC);
     $objKey->generateSessionKey();
     $siteKey = new XMLSecurityKey(XMLSecurityKey::RSA_OAEP_MGF1P, array('type' => 'public'));
     $siteKey->loadKey(SERVICE_CERT, true, true);
     $options = array("KeyInfo" => array("X509SubjectKeyIdentifier" => true));
     $objWSSE->encryptSoapDoc($siteKey, $objKey, $options);
     $retVal = parent::__doRequest($objWSSE->saveXML(), $location, $saction, $version);
     $doc = new DOMDocument();
     $doc->loadXML($retVal);
     $options = array("keys" => array("private" => array("key" => PRIVATE_KEY, "isFile" => true, "isCert" => false)));
     $objWSSE->decryptSoapDoc($doc, $options);
     return $doc->saveXML();
 }