Visual Basic 6.0

Calculate HRMC IRMark

See more XML Digital Signatures Examples

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

Chilkat Visual Basic 6.0 Downloads

Visual Basic 6.0

' 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 ChilkatXml
xml.Tag = "GovTalkMessage"
success = xml.AddAttribute("xmlns","http://www.govtalk.gov.uk/CM/envelope")
success = xml.UpdateAttrAt("Body|Message",1,"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.Print xml.GetXml()

' Canonicalize the XML (using C14N)
Dim xdsig As New ChilkatXmlDSig
Dim withComments As Long
withComments = 0
Dim canonXml As String
canonXml = xdsig.CanonicalizeXml(xml.GetXml(),"C14N",withComments)

' Return the base64 SHA-1 HASH of the canonical XML.
Dim crypt As New ChilkatCrypt2
crypt.HashAlgorithm = "sha1"
crypt.EncodingMode = "base64"
Dim irmark As String
irmark = crypt.HashStringENC(canonXml)

Debug.Print "IRMark = " & irmark