(DataFlex) SII Chile - FRMT Signature Computation and Add to XML

Compute the FRMT signature and add to the XML. This is the RSA signature of the SHA-1 digest of the "flattened" DD element.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-win32.pkg

Procedure Test
    Handle hoXml
    Boolean iSuccess
    Variant vDdXml
    Handle hoDdXml
    Variant vSbFlattened
    Handle hoSbFlattened
    Variant vPrivKey
    Handle hoPrivKey
    Handle hoRsa
    String sSig
    String sTemp1
    Boolean bTemp1

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Also see:  Compute the FRMA Signature and Add to XML

    Get Create (RefClass(cComChilkatXml)) To hoXml
    If (Not(IsComObjectCreated(hoXml))) Begin
        Send CreateComObject of hoXml
    End

    // Load the unsigned XML that contains the following:

    // <DTE version="1.0">
    //   <Documento ID="F60T33">
    //         <TED version="1.0">
    //             <DD>
    // 		...
    //                 <CAF version="1.0">
    //                     <DA>
    // 			...
    //                     </DA>
    //                     <FRMA algoritmo="SHA1withRSA">...</FRMA>
    //                 </CAF>
    //                 ...
    //             </DD>
    //             ... The FRMT will be added here in another example ...
    //         </TED>
    //   </Documento>
    // </DTE>

    Get ComLoadXmlFile Of hoXml "qa_data/xml_dsig/sii_cl/test_1.xml" To iSuccess
    If (iSuccess = False) Begin
        Showln "Failed to load initial XML file."
        Procedure_Return
    End

    // Get a reference to the "DD" element
    Get ComFindChild Of hoXml "Documento|TED|DD" To vDdXml
    If (IsComObject(vDdXml)) Begin
        Get Create (RefClass(cComChilkatXml)) To hoDdXml
        Set pvComObject Of hoDdXml To vDdXml
    End
    Get ComLastMethodSuccess Of hoXml To bTemp1
    If (bTemp1 = False) Begin
        Showln "Failed to find DD element"
        Procedure_Return
    End

    //  We need to get the "flattened" DD XML where:
    //    - No whitespace between elements.
    //    - The 5 pre-defined entities are converted.
    //    - The text is encoded in the ISO-8859-1 character set (Latin-1), 
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbFlattened
    If (Not(IsComObjectCreated(hoSbFlattened))) Begin
        Send CreateComObject of hoSbFlattened
    End
    Set ComEmitCompact Of hoDdXml To True
    Set ComEmitXmlDecl Of hoDdXml To False
    Get pvComObject of hoSbFlattened to vSbFlattened
    Get ComGetXmlSb Of hoDdXml vSbFlattened To iSuccess

    // Compute the SHA-1 message digest of the iso-8859-1 byte representation, 
    // and sign it with our RSA private key, getting the result in base64 format.

    Get Create (RefClass(cComChilkatPrivateKey)) To hoPrivKey
    If (Not(IsComObjectCreated(hoPrivKey))) Begin
        Send CreateComObject of hoPrivKey
    End
    Get ComLoadAnyFormatFile Of hoPrivKey "qa_data/rsa/rsaPrivKey_pkcs8.pem" "" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoPrivKey To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatRsa)) To hoRsa
    If (Not(IsComObjectCreated(hoRsa))) Begin
        Send CreateComObject of hoRsa
    End
    Get pvComObject of hoPrivKey to vPrivKey
    Get ComImportPrivateKeyObj Of hoRsa vPrivKey To iSuccess

    Set ComEncodingMode Of hoRsa To "base64"
    Set ComCharset Of hoRsa To "iso-8859-1"
    Get ComGetAsString Of hoSbFlattened To sTemp1
    Get ComSignStringENC Of hoRsa sTemp1 "sha1" To sSig

    // Add the FRMT signature element to the XML.
    Send ComUpdateChildContent To hoXml "Documento|TED|FRMT" sSig
    Get ComUpdateAttrAt Of hoXml "Documento|TED|FRMT" True "algoritmo" "SHA1withRSA" To iSuccess

    Send Destroy of hoDdXml

    // See what we have:
    Set ComEmitCompact Of hoXml To False
    Set ComEmitXmlDecl Of hoXml To True
    Get ComGetXml Of hoXml To sTemp1
    Showln sTemp1


End_Procedure