(DataFlex) Get Certificates within XML Signature

Demonstrates how to get the certificates contained within an XML signature.

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

Use ChilkatAx-win32.pkg

Procedure Test
    Variant vSbXml
    Handle hoSbXml
    Boolean iSuccess
    Handle hoDsig
    Integer i
    Variant vSaCerts
    Handle hoSaCerts
    Handle hoCert
    Boolean iBVerifyReferenceDigests
    Boolean iBVerified
    Integer j
    String sTemp1
    Integer iTemp1

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

    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbXml
    If (Not(IsComObjectCreated(hoSbXml))) Begin
        Send CreateComObject of hoSbXml
    End

    // Load XML containing one or more signatures.
    Get ComLoadFile Of hoSbXml "qa_data/xml_dsig_valid_samples/multipleSigners/sp.pdf.XAdES.xml" "utf-8" To iSuccess
    If (iSuccess = False) Begin
        Showln "Failed to load the XML file.."
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatXmlDSig)) To hoDsig
    If (Not(IsComObjectCreated(hoDsig))) Begin
        Send CreateComObject of hoDsig
    End

    // First load the XML containing the signatures to be verified.
    // Note that this particular Signature already contains the RSA public key that will be used
    // for verification.
    Get pvComObject of hoSbXml to vSbXml
    Get ComLoadSignatureSb Of hoDsig vSbXml To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoDsig To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // For each signature, verify and also get the certificate(s) contained within each Signature.
    Move 0 To i
    Get Create (RefClass(cComCkStringArray)) To hoSaCerts
    If (Not(IsComObjectCreated(hoSaCerts))) Begin
        Send CreateComObject of hoSaCerts
    End
    Get Create (RefClass(cComChilkatCert)) To hoCert
    If (Not(IsComObjectCreated(hoCert))) Begin
        Send CreateComObject of hoCert
    End

    Get ComNumSignatures Of hoDsig To iTemp1
    Showln "numSignatures = " iTemp1

    While (i < (ComNumSignatures(hoDsig)))
        // Select the Nth signature by setting the Selector property.
        Set ComSelector Of hoDsig To i

        Move True To iBVerifyReferenceDigests
        Get ComVerifySignature Of hoDsig iBVerifyReferenceDigests To iBVerified
        Showln "Signature " (i + 1) " verified = " iBVerified

        // Get the certificates embedded in this signature.
        Send ComClear To hoSaCerts
        Get pvComObject of hoSaCerts to vSaCerts
        Get ComGetCerts Of hoDsig vSaCerts To iSuccess
        If (iSuccess = True) Begin
            Move 0 To j
            While (j < (ComCount(hoSaCerts)))
                Get ComGetString Of hoSaCerts j To sTemp1
                Get ComLoadFromBase64 Of hoCert sTemp1 To iSuccess
                If (iSuccess = True) Begin
                    Get ComSubjectDN Of hoCert To sTemp1
                    Showln "    " sTemp1
                End

                Move (j + 1) To j
            Loop

        End

        Move (i + 1) To i
    Loop



End_Procedure