(PHP Extension) Alliance Access LAU Sign Message (XML Signature using HMAC-SHA-256)

Demonstrates how to sign XML according to the requirements for Alliance Access LAU (Local Authentication) using HMAC-SHA-256.

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

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

// We begin with this message:

// <?xml version="1.0" encoding="utf-8"?>
// <Saa:DataPDU xmlns:Saa="urn:swift:saa:xsd:saa.2.0" xmlns:Sw="urn:swift:snl:ns.Sw"
//   xmlns:SwGbl="urn:swift:snl:ns.SwGbl" xmlns:SwInt="urn:swift:snl:ns:SwInt" xmlns:SwSec="url:swift:snl:ns.SwSec">
//     <Saa:Revision>2.0.7</Saa:Revision>
//     <Saa:Header>
//         <Saa:Message>
// 			<test>blah blah</test>
//         </Saa:Message>
//     </Saa:Header>
//     <Saa:Body>...</Saa:Body>
//     <Saa:LAU>
//     </Saa:LAU>
// </Saa:DataPDU>

// And we want so sign to create this as the result:
// The signed XML we'll create will not be indented and pretty-printed like this.
// Instead, we'll use the "CompactSignedXml" behavior to produce compact single-line XML.

// <?xml version="1.0" encoding="utf-8"?>
// <Saa:DataPDU xmlns:Saa="urn:swift:saa:xsd:saa.2.0" xmlns:Sw="urn:swift:snl:ns.Sw"
//   xmlns:SwGbl="urn:swift:snl:ns.SwGbl" xmlns:SwInt="urn:swift:snl:ns:SwInt" xmlns:SwSec="url:swift:snl:ns.SwSec">
//     <Saa:Revision>2.0.7</Saa:Revision>
//     <Saa:Header>
//         <Saa:Message>
// 			<test>blah blah</test>
//         </Saa:Message>
//     </Saa:Header>
//     <Saa:Body>...</Saa:Body>
//     <Saa:LAU>
//         <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/2001/04/xmldsig-more#hmac-sha256"/>
//                 <ds:Reference URI="">
//                     <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/2001/04/xmlenc#sha256"/>
//                     <ds:DigestValue>Y7oScHnYOUQvni/TSzZbDec+HR+mWIFH149GXpwj1Ws=</ds:DigestValue>
//                 </ds:Reference>
//             </ds:SignedInfo>
//             <ds:SignatureValue>6ynF/FcwbPsHrtlj3h2agJigdnvpbO6hOzKSRGzqkw0=</ds:SignatureValue>
//         </ds:Signature>
//     </Saa:LAU>
// </Saa:DataPDU>

$success = true;

// Create the XML to be signed...

// (The XML does not need to be created this way.  It can be loaded from a file or a string.)
// Also, use this online tool to generate code from sample XML: 
// Generate Code to Create XML

$xmlToSign = new CkXml();
$xmlToSign->put_Tag('Saa:DataPDU');
$xmlToSign->AddAttribute('xmlns:Saa','urn:swift:saa:xsd:saa.2.0');
$xmlToSign->AddAttribute('xmlns:Sw','urn:swift:snl:ns.Sw');
$xmlToSign->AddAttribute('xmlns:SwGbl','urn:swift:snl:ns.SwGbl');
$xmlToSign->AddAttribute('xmlns:SwInt','urn:swift:snl:ns:SwInt');
$xmlToSign->AddAttribute('xmlns:SwSec','url:swift:snl:ns.SwSec');
$xmlToSign->UpdateChildContent('Saa:Revision','2.0.7');
$xmlToSign->UpdateChildContent('Saa:Header|Saa:Message|test','blah blah');
$xmlToSign->UpdateChildContent('Saa:Body','...');
$xmlToSign->UpdateChildContent('Saa:LAU','');

$gen = new CkXmlDSigGen();

$gen->put_SigLocation('Saa:DataPDU|Saa:LAU');
$gen->put_SigLocationMod(0);
$gen->put_SigNamespacePrefix('ds');
$gen->put_SigNamespaceUri('http://www.w3.org/2000/09/xmldsig#');
$gen->put_SignedInfoCanonAlg('EXCL_C14N');
$gen->put_SignedInfoDigestMethod('sha256');

// You may alternatively choose "IndentedSignature" instead of "CompactSignedXml"
$gen->put_Behaviors('CompactSignedXml');

$gen->AddSameDocRef('','sha256','EXCL_C14N','','');

// Specify the HMAC key.
// For example, if the HMAC key is to be the us-ascii bytes of the string "secret",
// the HMAC key can be set in any of the following ways (and also more ways not shown here..)
$gen->SetHmacKey('secret','ascii');
// or
$gen->SetHmacKey('c2VjcmV0','base64');
// or
$gen->SetHmacKey('736563726574','hex');

// Sign the XML..
$sbXml = new CkStringBuilder();
$xmlToSign->GetXmlSb($sbXml);
$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);

// Show the signed XML.
print $sbXml->getAsString() . "\n";

?>