JavaScript

Calculate HRMC IRMark

See more XML Digital Signatures Examples

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

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

JavaScript

// 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.
var xml = new CkXml();
xml.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>

console.log(xml.GetXml());

// Canonicalize the XML (using C14N)
var xdsig = new CkXmlDSig();
var withComments = false;
var canonXml = xdsig.CanonicalizeXml(xml.GetXml(),"C14N",withComments);

// Return the base64 SHA-1 HASH of the canonical XML.
var crypt = new CkCrypt2();
crypt.HashAlgorithm = "sha1";
crypt.EncodingMode = "base64";
var irmark = crypt.HashStringENC(canonXml);

console.log("IRMark = " + irmark);