VB.NET

Calculate HRMC IRMark

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

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VB.NET

' 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.
Dim xml As New Chilkat.Xml
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>

Debug.WriteLine(xml.GetXml())

' Canonicalize the XML (using C14N)
Dim xdsig As New Chilkat.XmlDSig
Dim withComments As Boolean = False
Dim canonXml As String = xdsig.CanonicalizeXml(xml.GetXml(),"C14N",withComments)

' Return the base64 SHA-1 HASH of the canonical XML.
Dim crypt As New Chilkat.Crypt2
crypt.HashAlgorithm = "sha1"
crypt.EncodingMode = "base64"
Dim irmark As String = crypt.HashStringENC(canonXml)

Debug.WriteLine("IRMark = " & irmark)