(Go) Calculate HRMC IRMark

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

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    // 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 := chilkat.NewXml()
    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>

    fmt.Println(*xml.GetXml())

    // Canonicalize the XML (using C14N)
    xdsig := chilkat.NewXmlDSig()
    withComments := false
    canonXml := xdsig.CanonicalizeXml(*xml.GetXml(),"C14N",withComments)

    // Return the base64 SHA-1 HASH of the canonical XML.
    crypt := chilkat.NewCrypt2()
    crypt.SetHashAlgorithm("sha1")
    crypt.SetEncodingMode("base64")
    irmark := crypt.HashStringENC(*canonXml)

    fmt.Println("IRMark = ", *irmark)

    xml.DisposeXml()
    xdsig.DisposeXmlDSig()
    crypt.DisposeCrypt2()