PHP Extension

Calculate HRMC IRMark

See more XML Digital Signatures Examples

Demonstrates how to calculate an IRmark for an HMRC GovTalkMessage XML document.

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PHP Extension

<?php

include("chilkat.php");

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

// First build a sample (but incomplete) GovTalkMessage.
// You can replace this code with a call to LoadXml or LoadXmlFile..
// 
// Note: The online tool at https://tools.chilkat.io/xmlCreate.cshtml
// can be used to generate XML code that creates a given XML document.
$xml = new CkXml();
$xml->put_Tag('GovTalkMessage');
$xml->AddAttribute('xmlns','http://www.govtalk.gov.uk/CM/envelope');
$xml->UpdateAttrAt('Body|Message',true,'xmlns','urn:g3.ge:dea:call:SendDocument:v1');
$xml->UpdateChildContent('Body|Message','................');

// This is the XML created:
// <?xml version="1.0" encoding="utf-8" ?>
// <GovTalkMessage xmlns="http://www.govtalk.gov.uk/CM/envelope">
//     <Body>
//         <Message xmlns="urn:g3.ge:dea:call:SendDocument:v1">................</Message>
//     </Body>
// </GovTalkMessage>

print $xml->getXml() . "\n";

// Canonicalize the XML (using C14N)
$xdsig = new CkXmlDSig();
$withComments = false;
$canonXml = $xdsig->canonicalizeXml($xml->getXml(),'C14N',$withComments);

// Return the base64 SHA-1 HASH of the canonical XML.
$crypt = new CkCrypt2();
$crypt->put_HashAlgorithm('sha1');
$crypt->put_EncodingMode('base64');
$irmark = $crypt->hashStringENC($canonXml);

print 'IRMark = ' . $irmark . "\n";

?>