Java

Calculate HRMC IRMark

See more XML Digital Signatures Examples

Demonstrates how to calculate an IRmark for an HMRC GovTalkMessage XML document. Chilkat2 Java

import com.chilkatsoft.chilkat2.Crypt2;
import com.chilkatsoft.chilkat2.Xml;
import com.chilkatsoft.chilkat2.XmlDSig;

public class ChilkatExample {

    public static void main(String[] args) {
        // 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 xml = new Xml();
        xml.setTag("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>

        System.out.println(xml.getXml());

        // Canonicalize the XML (using C14N)
        XmlDSig xdsig = new XmlDSig();
        boolean withComments = false;
        String canonXml = xdsig.canonicalizeXml(xml.getXml(), "C14N", withComments);

        // Return the base64 SHA-1 HASH of the canonical XML.
        Crypt2 crypt = new Crypt2();
        crypt.setHashAlgorithm("sha1");
        crypt.setEncodingMode("base64");
        String irmark = crypt.hashStringENC(canonXml);

        System.out.println("IRMark = " + irmark);
    }
}