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PHP

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).

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<?php

use Chilkat2\Cert;
use Chilkat2\StringBuilder;
use Chilkat2\Xml;
use Chilkat2\XmlDSig;
use Chilkat2\XmlDSigGen;

$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 Xml();
$xmlToSign->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 XmlDSigGen();

$gen->SigLocation = 'samlp:AuthnRequest';
$gen->SigNamespacePrefix = 'ds';
$gen->SigNamespaceUri = 'http://www.w3.org/2000/09/xmldsig#';
$gen->SignedInfoCanonAlg = 'EXCL_C14N';
$gen->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 Cert();
try {
    $cert->LoadPfxFile('qa_data/pfx/cert_test123.pfx', 'test123');

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

    $gen->KeyInfoType = 'X509Data';
    $gen->X509Type = 'Certificate';

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

    $gen->Behaviors = 'IndentedSignature,ForceAddEnvelopedSignatureTransform';

    // Sign the XML...
    $gen->CreateXmlDSigSb($sbXml);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

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

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

// ----------------------------------------
// Verify the signature we just produced...
$verifier = new XmlDSig();
try {
    $verifier->LoadSignatureSb($sbXml);

    $verifier->VerifySignature(true);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo "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>
 *
 */