DataFlex

Combine Timestamp Reply and Content File into a TimeStampData

See more ASN.1 Examples

Demonstrates how to combine a timestamp reply (RFC 3161) with a data file (any type of file) to create a TimeStampData structure (RFC 5544). DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoBdTsr
    Handle hoAsnTsr
Tsr    Handle hoXmlTsr
    Handle hoBdContent
    Handle hoXml
    Variant vXContext
    Handle hoXContext
    Handle hoTsd
    String sTsdBase64
    String sTemp1

    Move False To iSuccess

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

    // Also see this example:
    // Send a TimeStamp Request to a TimeStamp Authority and get the Response

    // Load a timestamp reply file
    Get Create (RefClass(cComChilkatBinData)) To hoBdTsr
    If (Not(IsComObjectCreated(hoBdTsr))) Begin
        Send CreateComObject of hoBdTsr
    End
    Get ComLoadFile Of hoBdTsr "qa_data/tsd/sample.tsr" To iSuccess
    If (iSuccess <> True) Begin
        Showln "Failed to load timestamp reply file."
        Procedure_Return
    End

    // Load the tsr into an ASN.1 object.
    Get Create (RefClass(cComChilkatAsn)) To hoAsnTsr
    If (Not(IsComObjectCreated(hoAsnTsr))) Begin
        Send CreateComObject of hoAsnTsr
    End
    Get ComGetEncoded Of hoBdTsr "base64" To sTemp1
    Get ComLoadEncoded Of hoAsnTsr sTemp1 "base64" To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoAsnTsr To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Get the timestamp reply as XML.
    Get Create (RefClass(cComChilkatXml)) To hoXmlTsr
    If (Not(IsComObjectCreated(hoXmlTsr))) Begin
        Send CreateComObject of hoXmlTsr
    End
    Get ComAsnToXml Of hoAsnTsr To sTemp1
    Get ComLoadXml Of hoXmlTsr sTemp1 To iSuccess

    // The timestamp reply XML begins like this:
    // We'll want to remove the 1st "sequence" subtree.

    //     <?xml version="1.0" encoding="utf-8"?>
    //     <sequence>
    //         <sequence>       <---- Remove this sub-tree.
    //             <int>00</int>
    //             <sequence>
    //                 <utf8>Operation Okay</utf8>
    //             </sequence>
    //         </sequence>
    //         <sequence>   
    //             <oid>1.2.840.113549.1.7.2</oid>
    //             <contextSpecific tag="0" constructed="1">
    //             ...

    // Remove the 1st sub-tree..
    Send ComRemoveChildByIndex To hoXmlTsr 0

    // In this example, the data file we're combining with the timestamp into a timestampData is a .p7m.
    // However, it can be any type of file (text or binary), it doesn't matter..
    Get Create (RefClass(cComChilkatBinData)) To hoBdContent
    If (Not(IsComObjectCreated(hoBdContent))) Begin
        Send CreateComObject of hoBdContent
    End
    Get ComLoadFile Of hoBdContent "qa_data/tsd/sample.p7m" To iSuccess
    If (iSuccess <> True) Begin
        Showln "Failed to load content file."
        Procedure_Return
    End

    // Begin building the TimeStampData.  
    // We'll build as XML and then convert to ASN.1
    Get Create (RefClass(cComChilkatXml)) To hoXml
    If (Not(IsComObjectCreated(hoXml))) Begin
        Send CreateComObject of hoXml
    End
    Set ComTag Of hoXml To "sequence"
    Send ComUpdateChildContent To hoXml "oid" "1.2.840.113549.1.9.16.1.31"
    Get ComUpdateAttrAt Of hoXml "contextSpecific" True "tag" "0" To iSuccess
    Get ComUpdateAttrAt Of hoXml "contextSpecific" True "constructed" "1" To iSuccess
    Send ComUpdateChildContent To hoXml "contextSpecific|sequence|int" "01"
    Get ComGetEncoded Of hoBdContent "base64" To sTemp1
    Send ComUpdateChildContent To hoXml "contextSpecific|sequence|octets" sTemp1
    Get ComUpdateAttrAt Of hoXml "contextSpecific|sequence|contextSpecific" True "tag" "0" To iSuccess
    Get ComUpdateAttrAt Of hoXml "contextSpecific|sequence|contextSpecific" True "constructed" "1" To iSuccess

    Get ComGetChildWithTag Of hoXml "contextSpecific|sequence|contextSpecific" To vXContext
    If (IsComObject(vXContext)) Begin
        Get Create (RefClass(cComChilkatXml)) To hoXContext
        Set pvComObject Of hoXContext To vXContext
    End
    Get pvComObject of hoXmlTsr to vXmlTsr
    Get ComAddChildTree Of hoXContext vXmlTsr To iSuccess
    Send Destroy of hoXContext

    // Convert the XML to ASN.1
    Get Create (RefClass(cComChilkatAsn)) To hoTsd
    If (Not(IsComObjectCreated(hoTsd))) Begin
        Send CreateComObject of hoTsd
    End
    Get ComGetXml Of hoXml To sTemp1
    Get ComLoadAsnXml Of hoTsd sTemp1 To iSuccess

    // Write the timestamped data to a file.
    Get ComWriteBinaryDer Of hoTsd "qa_output/sample.tsd" To iSuccess

    // Alternatively, get the tsd ASN.1 as base64..
    Get ComGetEncodedDer Of hoTsd "base64_mime" To sTsdBase64
    Showln sTsdBase64


End_Procedure