(PHP Extension) Calculate HRMC IRMark

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

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.

//  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";

?>