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DataFlex

Calculate HRMC IRMark

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

Chilkat DataFlex Downloads

Download Chilkat for DataFlex
DataFlex 
Use ChilkatAx-win32.pkg

Procedure Test
    Handle hoXml
    Boolean iSuccess
    Handle hoXdsig
    Boolean iWithComments
    String sCanonXml
    Handle hoCrypt
    String sIrmark
    String sTemp1

    // 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.
    Get Create (RefClass(cComChilkatXml)) To hoXml
    If (Not(IsComObjectCreated(hoXml))) Begin
        Send CreateComObject of hoXml
    End
    Set ComTag Of hoXml To "GovTalkMessage"
    Get ComAddAttribute Of hoXml "xmlns" "http://www.govtalk.gov.uk/CM/envelope" To iSuccess
    Get ComUpdateAttrAt Of hoXml "Body|Message" True "xmlns" "urn:g3.ge:dea:call:SendDocument:v1" To iSuccess
    Send ComUpdateChildContent To hoXml "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>

    Get ComGetXml Of hoXml To sTemp1
    Showln sTemp1

    // Canonicalize the XML (using C14N)
    Get Create (RefClass(cComChilkatXmlDSig)) To hoXdsig
    If (Not(IsComObjectCreated(hoXdsig))) Begin
        Send CreateComObject of hoXdsig
    End
    Move False To iWithComments
    Get ComGetXml Of hoXml To sTemp1
    Get ComCanonicalizeXml Of hoXdsig sTemp1 "C14N" iWithComments To sCanonXml

    // Return the base64 SHA-1 HASH of the canonical XML.
    Get Create (RefClass(cComChilkatCrypt2)) To hoCrypt
    If (Not(IsComObjectCreated(hoCrypt))) Begin
        Send CreateComObject of hoCrypt
    End
    Set ComHashAlgorithm Of hoCrypt To "sha1"
    Set ComEncodingMode Of hoCrypt To "base64"
    Get ComHashStringENC Of hoCrypt sCanonXml To sIrmark

    Showln "IRMark = " sIrmark


End_Procedure