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Calculate HRMC IRMark

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

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Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

# 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 = New-Object 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>

$($xml.GetXml())

# Canonicalize the XML (using C14N)
$xdsig = New-Object Chilkat.XmlDSig
$withComments = $false
$canonXml = $xdsig.CanonicalizeXml($xml.GetXml(),"C14N",$withComments)

# Return the base64 SHA-1 HASH of the canonical XML.
$crypt = New-Object Chilkat.Crypt2
$crypt.HashAlgorithm = "sha1"
$crypt.EncodingMode = "base64"
$irmark = $crypt.HashStringENC($canonXml)

$("IRMark = " + $irmark)