SAML2\Message::validateSignature PHP Method

    private function validateSignature(\DOMElement $xml)
    {
        try {
            /** @var null|\DOMAttr $signatureMethod */
            $signatureMethod = Utils::xpQuery($xml, './ds:Signature/ds:SignedInfo/ds:SignatureMethod/@Algorithm');
            $sig = Utils::validateElement($xml);
            if ($sig !== false) {
                $this->messageContainedSignatureUponConstruction = true;
                $this->certificates = $sig['Certificates'];
                $this->validators[] = array('Function' => array('\\SAML2\\Utils', 'validateSignature'), 'Data' => $sig);
                $this->signatureMethod = $signatureMethod[0]->value;
            }
        } catch (\Exception $e) {
            // ignore signature validation errors
        }
    }