setAssertionConsumerServiceURL('https://my.site/acs') ->setProtocolBinding(\LightSaml\SamlConstants::BINDING_SAML2_HTTP_POST) ->setID(\LightSaml\Helper::generateID()) ->setIssueInstant(new \DateTime()) ->setDestination('https://idp.com/login') ->setIssuer(new \LightSaml\Model\Assertion\Issuer('https://my.entity.id')) ; $certificate = \LightSaml\Credential\X509Certificate::fromFile(__DIR__.'/../resources/sample/Certificate/lightsaml-idp.crt'); $privateKey = \LightSaml\Credential\KeyHelper::createPrivateKey(__DIR__.'/../resources/sample/Certificate/lightsaml-idp.key', '', true); $authnRequest->setSignature(new \LightSaml\Model\XmlDSig\SignatureWriter($certificate, $privateKey)); $serializationContext = new \LightSaml\Model\Context\SerializationContext(); $authnRequest->serialize($serializationContext->getDocument(), $serializationContext); print $serializationContext->getDocument()->saveXML(); $expectedXmlOutput = << https://my.entity.id Ez74FQ0Nqwre+mL8/Zsceekeh/s= SIGNATURE.BYTES.HERE== CERTIFICATE.BYTES.HERE= EOT;