(DataFlex) Extract TSTInfo from RFC3161 Timestamp Reply

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Sends an RFC 3161 timestamp request to a TSA (Timestamp Authority) server and converts the timestamp reply to XML, and then extracts the TSTInfo from the XML and converts it to XML.

For more information, see https://www.ietf.org/rfc/rfc3161.txt

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

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoCrypt
    String sBase64Hash
    Handle hoHttp
    Variant vRequestToken
    Handle hoRequestToken
    String sOptionalPolicyOid
    Boolean iAddNonce
    Boolean iRequestTsaCert
    String sTsaUrl
    Variant vResp
    Handle hoResp
    Variant vTimestampReply
    Handle hoTimestampReply
    Handle hoAsn
    Handle hoXml
    String sTstInfoBase64
    Variant vBdTstInfo
    Handle hoBdTstInfo
TstInfo    Handle hoAsnTstInfo
TstInfo    Handle hoXmlTstInfo
    Handle hoSbGenTime
    String sTemp1
    Boolean bTemp1

    // Note: Requires Chilkat v9.5.0.75 or greater.

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

    // First sha-256 hash the data that is to be timestamped.
    // In this example, the data is the string "Hello World"

    Get Create (RefClass(cComChilkatCrypt2)) To hoCrypt
    If (Not(IsComObjectCreated(hoCrypt))) Begin
        Send CreateComObject of hoCrypt
    End
    Set ComHashAlgorithm Of hoCrypt To "sha256"
    Set ComEncodingMode Of hoCrypt To "base64"
    Get ComHashFileENC Of hoCrypt "qa_data/hamlet.xml" To sBase64Hash

    Get Create (RefClass(cComChilkatHttp)) To hoHttp
    If (Not(IsComObjectCreated(hoHttp))) Begin
        Send CreateComObject of hoHttp
    End

    Get Create (RefClass(cComChilkatBinData)) To hoRequestToken
    If (Not(IsComObjectCreated(hoRequestToken))) Begin
        Send CreateComObject of hoRequestToken
    End
    Move "" To sOptionalPolicyOid
    Move False To iAddNonce
    Move True To iRequestTsaCert

    // Create a time-stamp request token
    Get pvComObject of hoRequestToken to vRequestToken
    Get ComCreateTimestampRequest Of hoHttp "sha256" sBase64Hash sOptionalPolicyOid iAddNonce iRequestTsaCert vRequestToken To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Send the time-stamp request token to the TSA.
    // This is the equivalent of the following CURL command:
    // curl -H "Content-Type: application/timestamp-query" --data-binary '@file.tsq' http://timestamp.digicert.com > file.tsr
    Move "http://timestamp.digicert.com" To sTsaUrl
    Get pvComObject of hoRequestToken to vRequestToken
    Get ComPBinaryBd Of hoHttp "POST" sTsaUrl vRequestToken "application/timestamp-query" False False To vResp
    If (IsComObject(vResp)) Begin
        Get Create (RefClass(cComChilkatHttpResponse)) To hoResp
        Set pvComObject Of hoResp To vResp
    End
    Get ComLastMethodSuccess Of hoHttp To bTemp1
    If (bTemp1 = False) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Get the timestamp reply from the HTTP response object.
    Get Create (RefClass(cComChilkatBinData)) To hoTimestampReply
    If (Not(IsComObjectCreated(hoTimestampReply))) Begin
        Send CreateComObject of hoTimestampReply
    End
    Get pvComObject of hoTimestampReply to vTimestampReply
    Get ComGetBodyBd Of hoResp vTimestampReply To iSuccess
    Send Destroy of hoResp

    // Convert the binary timestamp reply to XML
    Get Create (RefClass(cComChilkatAsn)) To hoAsn
    If (Not(IsComObjectCreated(hoAsn))) Begin
        Send CreateComObject of hoAsn
    End
    Get pvComObject of hoTimestampReply to vTimestampReply
    Get ComLoadBd Of hoAsn vTimestampReply To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoAsn To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatXml)) To hoXml
    If (Not(IsComObjectCreated(hoXml))) Begin
        Send CreateComObject of hoXml
    End
    Get ComAsnToXml Of hoAsn To sTemp1
    Get ComLoadXml Of hoXml sTemp1 To iSuccess

    // Extract the TSTInfo from the XML.
    // The TSTInfo is this base64 encoded ASN.1 

    // TSTInfo ::= SEQUENCE  {
    //    version                      INTEGER  { v1(1) },
    //    policy                       TSAPolicyId,
    //    messageImprint               MessageImprint,
    //      -- MUST have the same value as the similar field in
    //      -- TimeStampReq
    //    serialNumber                 INTEGER,
    //     -- Time-Stamping users MUST be ready to accommodate integers
    //     -- up to 160 bits.
    //    genTime                      GeneralizedTime,
    //    accuracy                     Accuracy                 OPTIONAL,
    //    ordering                     BOOLEAN             DEFAULT FALSE,
    //    nonce                        INTEGER                  OPTIONAL,
    //      -- MUST be present if the similar field was present
    //      -- in TimeStampReq.  In that case it MUST have the same value.
    //    tsa                          [0] GeneralName          OPTIONAL,
    //    extensions                   [1] IMPLICIT Extensions   OPTIONAL  }

    Get ComGetChildContent Of hoXml "sequence[1]|contextSpecific|sequence|sequence|contextSpecific|octets" To sTstInfoBase64

    Get Create (RefClass(cComChilkatBinData)) To hoBdTstInfo
    If (Not(IsComObjectCreated(hoBdTstInfo))) Begin
        Send CreateComObject of hoBdTstInfo
    End
    Get ComAppendEncoded Of hoBdTstInfo sTstInfoBase64 "base64" To iSuccess

    Get Create (RefClass(cComChilkatAsn)) To hoAsnTstInfo
    If (Not(IsComObjectCreated(hoAsnTstInfo))) Begin
        Send CreateComObject of hoAsnTstInfo
    End
    Get pvComObject of hoBdTstInfo to vBdTstInfo
    Get ComLoadBd Of hoAsnTstInfo vBdTstInfo To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoAsnTstInfo To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatXml)) To hoXmlTstInfo
    If (Not(IsComObjectCreated(hoXmlTstInfo))) Begin
        Send CreateComObject of hoXmlTstInfo
    End
    Get ComAsnToXml Of hoAsnTstInfo To sTemp1
    Get ComLoadXml Of hoXmlTstInfo sTemp1 To iSuccess
    Get ComGetXml Of hoXmlTstInfo To sTemp1
    Showln sTemp1

    // Here's the TSTInfo XML:

    // <?xml version="1.0" encoding="utf-8"?>
    // <sequence>
    //     <int>01</int>
    //     <oid>2.16.840.1.114412.7.1</oid>
    //     <sequence>
    //         <sequence>
    //             <oid>2.16.840.1.101.3.4.2.1</oid>
    //             <null/>
    //         </sequence>
    //         <octets>4sRRyWOzC7EOic4fQ9+Op1pa10DbgoBGjBvkq09LZmE=</octets>
    //     </sequence>
    //     <int>00AD2C86E49872597B60F87D5C54BCFFAE</int>
    //     <universal tag="24" constructed="0">MjAyMzAzMTYxMTQ5NTJa</universal>
    // </sequence>

    //    The genTime (GeneralizedTime) is contained in the final "universal" XML element and is 
    //    in base64. It is the time at which the time-stamp token has been created by
    //    the TSA. After decoding from base64, it is:
    // 
    //    The syntax is: YYYYMMDDhhmmss[.s...]Z
    //    Example: 19990609001326.34352Z

    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbGenTime
    If (Not(IsComObjectCreated(hoSbGenTime))) Begin
        Send CreateComObject of hoSbGenTime
    End
    Get ComGetChildContent Of hoXmlTstInfo "universal" To sTemp1
    Get ComDecodeAndAppend Of hoSbGenTime sTemp1 "base64" "utf-8" To iSuccess
    Get ComGetAsString Of hoSbGenTime To sTemp1
    Showln sTemp1

    // Result:
    // 20230316115718Z


End_Procedure