Sample code for 30+ languages & platforms
PHP Extension

Create AuthNRequest with embedded signature (HTTP-POST binding)

See more XML Digital Signatures Examples

Demonstrates how to create a SAML AuthNRequest with embedded signature (HTTP-POST binding).

Chilkat PHP Extension Downloads

Download Chilkat for PHP Extension
PHP Extension 
<?php

include("chilkat.php");

$success = false;

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// This example will sign the following SAML AuthNRequest:

// <samlp:AuthnRequest 
//      xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol"
//      xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"
//      ID="pfx41d8ef22-e612-8c50-9960-1b16f15741b3"
//      Version="2.0" ProviderName="SP test" IssueInstant="2014-07-16T23:52:45Z"
//      Destination="http://idp.example.com/SSOService.php"
//      ProtocolBinding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST"
//      AssertionConsumerServiceURL="http://sp.example.com/demo1/index.php?acs">
//   <saml:Issuer>http://sp.example.com/demo1/metadata.php</saml:Issuer>
//   <samlp:NameIDPolicy Format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress" AllowCreate="true"/>
//   <samlp:RequestedAuthnContext Comparison="exact">
//     <saml:AuthnContextClassRef>urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport</saml:AuthnContextClassRef>
//   </samlp:RequestedAuthnContext>
// </samlp:AuthnRequest>

// First we build the XML to be signed.
// 
// Use this online tool to generate the code from sample XML: 
// Generate Code to Create XML

$success = true;
$xmlToSign = new CkXml();
$xmlToSign->put_Tag('samlp:AuthnRequest');
$xmlToSign->AddAttribute('xmlns:samlp','urn:oasis:names:tc:SAML:2.0:protocol');
$xmlToSign->AddAttribute('xmlns:saml','urn:oasis:names:tc:SAML:2.0:assertion');
$xmlToSign->AddAttribute('ID','pfx41d8ef22-e612-8c50-9960-1b16f15741b3');
$xmlToSign->AddAttribute('Version','2.0');
$xmlToSign->AddAttribute('ProviderName','SP test');
$xmlToSign->AddAttribute('IssueInstant','2014-07-16T23:52:45Z');
$xmlToSign->AddAttribute('Destination','http://idp.example.com/SSOService.php');
$xmlToSign->AddAttribute('ProtocolBinding','urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST');
$xmlToSign->AddAttribute('AssertionConsumerServiceURL','http://sp.example.com/demo1/index.php?acs');
$xmlToSign->UpdateChildContent('saml:Issuer','http://sp.example.com/demo1/metadata.php');
$xmlToSign->UpdateAttrAt('samlp:NameIDPolicy',true,'Format','urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress');
$xmlToSign->UpdateAttrAt('samlp:NameIDPolicy',true,'AllowCreate','true');
$xmlToSign->UpdateAttrAt('samlp:RequestedAuthnContext',true,'Comparison','exact');
$xmlToSign->UpdateChildContent('samlp:RequestedAuthnContext|saml:AuthnContextClassRef','urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport');

// Also see the online tool to generate the code from sample already-signed XML: 
// Generate XML Signature Creation Code from an Already-Signed XML Sample

$gen = new CkXmlDSigGen();

$gen->put_SigLocation('samlp:AuthnRequest');
$gen->put_SigNamespacePrefix('ds');
$gen->put_SigNamespaceUri('http://www.w3.org/2000/09/xmldsig#');
$gen->put_SignedInfoCanonAlg('EXCL_C14N');
$gen->put_SignedInfoDigestMethod('sha1');

// -------- Reference 1 --------
$gen->AddSameDocRef('pfx41d8ef22-e612-8c50-9960-1b16f15741b3','sha1','EXCL_C14N','','');

// Provide a certificate + private key. (PFX password is test123)
$cert = new CkCert();
$success = $cert->LoadPfxFile('qa_data/pfx/cert_test123.pfx','test123');
if ($success != true) {
    print $cert->lastErrorText() . "\n";
    exit;
}

$gen->SetX509Cert($cert,true);

$gen->put_KeyInfoType('X509Data');
$gen->put_X509Type('Certificate');

// Load XML to be signed...
$sbXml = new CkStringBuilder();
$xmlToSign->GetXmlSb($sbXml);

$gen->put_Behaviors('IndentedSignature,ForceAddEnvelopedSignatureTransform');

// Sign the XML...
$success = $gen->CreateXmlDSigSb($sbXml);
if ($success != true) {
    print $gen->lastErrorText() . "\n";
    exit;
}

// Save the signed XMl to a file.
$success = $sbXml->WriteFile('qa_output/signedXml.xml','utf-8',false);

// A sample of the signed XML is shown below..
print $sbXml->getAsString() . "\n";

// ----------------------------------------
// Verify the signature we just produced...
$verifier = new CkXmlDSig();
$success = $verifier->LoadSignatureSb($sbXml);
if ($success != true) {
    print $verifier->lastErrorText() . "\n";
    exit;
}

$verified = $verifier->VerifySignature(true);
if ($verified != true) {
    print $verifier->lastErrorText() . "\n";
    exit;
}

print 'This signature was successfully verified.' . "\n";

// -----------------------------------------
// Sample output of AuthNRequest signed XML:
// (Line-breaks and some indenting added for readability..)

// <?xml version="1.0" encoding="utf-8"?>
// <samlp:AuthnRequest 
//   xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol" 
//   xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion" 
//   ID="pfx41d8ef22-e612-8c50-9960-1b16f15741b3" 
//   Version="2.0" ProviderName="SP test" 
//   IssueInstant="2014-07-16T23:52:45Z" 
//   Destination="http://idp.example.com/SSOService.php" 
//   ProtocolBinding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" 
//   AssertionConsumerServiceURL="http://sp.example.com/demo1/index.php?acs">
//     <saml:Issuer>http://sp.example.com/demo1/metadata.php</saml:Issuer>
//     <samlp:NameIDPolicy Format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress" AllowCreate="true"/>
//     <samlp:RequestedAuthnContext Comparison="exact">
//         <saml:AuthnContextClassRef>urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport</saml:AuthnContextClassRef>
//     </samlp:RequestedAuthnContext>
// 	<ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
// 	  <ds:SignedInfo>
// 	    <ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
// 	    <ds:SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/>
// 	    <ds:Reference URI="#pfx41d8ef22-e612-8c50-9960-1b16f15741b3">
// 	      <ds:Transforms>
// 	        <ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
// 	        <ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
// 	      </ds:Transforms>
// 	      <ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
// 	      <ds:DigestValue>5d+/YNShy4qnvZcvik8fHHg2SWQ=</ds:DigestValue>
// 	    </ds:Reference>
// 	  </ds:SignedInfo>
// 	  <ds:SignatureValue>QS16H5...U5LQ==</ds:SignatureValue>
// 	  <ds:KeyInfo>
// 	    <ds:X509Data>
// 	      <ds:X509Certificate>MIIF...tjlF4=</ds:X509Certificate>
// 	    </ds:X509Data>
// 	  </ds:KeyInfo>
// 	</ds:Signature>
// </samlp:AuthnRequest>
// 

?>