sspmod_adfs_IdP_ADFS::ADFS_SignResponse PHP Method

    public static function ADFS_SignResponse($response, $key, $cert)
    {
        $objXMLSecDSig = new XMLSecurityDSig();
        $objXMLSecDSig->idKeys = array('AssertionID');
        $objXMLSecDSig->setCanonicalMethod(XMLSecurityDSig::EXC_C14N);
        $responsedom = \SAML2\DOMDocumentFactory::fromString(str_replace("\r", "", $response));
        $firstassertionroot = $responsedom->getElementsByTagName('Assertion')->item(0);
        $objXMLSecDSig->addReferenceList(array($firstassertionroot), XMLSecurityDSig::SHA1, array('http://www.w3.org/2000/09/xmldsig#enveloped-signature', XMLSecurityDSig::EXC_C14N), array('id_name' => 'AssertionID'));
        $objKey = new XMLSecurityKey(XMLSecurityKey::RSA_SHA1, array('type' => 'private'));
        $objKey->loadKey($key, TRUE);
        $objXMLSecDSig->sign($objKey);
        if ($cert) {
            $public_cert = file_get_contents($cert);
            $objXMLSecDSig->add509Cert($public_cert, TRUE);
        }
        $newSig = $responsedom->importNode($objXMLSecDSig->sigNode, TRUE);
        $firstassertionroot->appendChild($newSig);
        return $responsedom->saveXML();
    }

 public static function sendResponse(array $state)
 {
     $spMetadata = $state["SPMetadata"];
     $spEntityId = $spMetadata['entityid'];
     $spMetadata = SimpleSAML_Configuration::loadFromArray($spMetadata, '$metadata[' . var_export($spEntityId, TRUE) . ']');
     $attributes = $state['Attributes'];
     $nameidattribute = $spMetadata->getValue('simplesaml.nameidattribute');
     if (!empty($nameidattribute)) {
         if (!array_key_exists($nameidattribute, $attributes)) {
             throw new Exception('simplesaml.nameidattribute does not exist in resulting attribute set');
         }
         $nameid = $attributes[$nameidattribute][0];
     } else {
         $nameid = SimpleSAML_Utilities::generateID();
     }
     $idp = SimpleSAML_IdP::getByState($state);
     $idpMetadata = $idp->getConfig();
     $idpEntityId = $idpMetadata->getString('entityid');
     $idp->addAssociation(array('id' => 'adfs:' . $spEntityId, 'Handler' => 'sspmod_adfs_IdP_ADFS', 'adfs:entityID' => $spEntityId));
     $response = sspmod_adfs_IdP_ADFS::ADFS_GenerateResponse($idpEntityId, $spEntityId, $nameid, $attributes);
     $privateKeyFile = SimpleSAML_Utilities::resolveCert($idpMetadata->getString('privatekey'));
     $certificateFile = SimpleSAML_Utilities::resolveCert($idpMetadata->getString('certificate'));
     $wresult = sspmod_adfs_IdP_ADFS::ADFS_SignResponse($response, $privateKeyFile, $certificateFile);
     $wctx = $state['adfs:wctx'];
     sspmod_adfs_IdP_ADFS::ADFS_PostResponse($spMetadata->getValue('prp'), $wresult, $wctx);
 }