(DataFlex) RFC3161 Timestamp Client - Fetch from Timestamp Authority (TSA) and Verify

Sends an RFC 3161 timestamp request to a TSA (Timestamp Authority) server and validates the timestamp token response.

Note: This example requires Chilkat v9.5.0.75 or greater.

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
    Variant vTsaCert
    Handle hoTsaCert
    Integer iPkiStatus
    Variant vJson
    Handle hoJson
    Variant vSigningTime
    Handle hoSigningTime
    Variant vAuthAttrSigningTimeUtctime
    Handle hoAuthAttrSigningTimeUtctime
    String sStrVal
    String sCertSerialNumber
    String sCertIssuerCN
    String sCertDigestAlgOid
    String sCertDigestAlgName
    String sContentType
    String sMessageDigest
    String sSigningAlgOid
    String sSigningAlgName
    String sAuthAttrContentTypeName
    String sAuthAttrContentTypeOid
    String sAuthAttrSigningTimeName
    String sAuthAttrSigningCertificateName
    String sAuthAttrSigningCertificateDer
    String sAuthAttrMessageDigestName
    String sAuthAttrMessageDigestDigest
    Integer iTimestampReplyPkiStatusValue
    String sTimestampReplyPkiStatusMeaning
    Integer i
    Integer iCount_i
    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 ComHashStringENC Of hoCrypt "Hello World" 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 <> True) 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' https://freetsa.org/tsr > file.tsr
    Move "https://freetsa.org/tsr" To sTsaUrl
    // Another timestamp server you could try is: http://timestamp.digicert.com
    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 <> True) 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

    // Show the base64 encoded timestamp reply.
    Get ComGetEncoded Of hoTimestampReply "base64" To sTemp1
    Showln sTemp1

    // Let's verify the timestamp reply against the TSA's cert, which we've previously downloaded.
    // See https://freetsa.org/index_en.php
    Get Create (RefClass(cComChilkatCert)) To hoTsaCert
    If (Not(IsComObjectCreated(hoTsaCert))) Begin
        Send CreateComObject of hoTsaCert
    End
    Get ComLoadFromFile Of hoTsaCert "qa_data/certs/freetsa.org.cer" To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoTsaCert To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // The VerifyTimestampReply method will return one of the following values:
    // -1:  The timestampReply does not contain a valid timestamp reply.
    // -2: The  timestampReply is a valid timestamp reply, but failed verification using the public key of the tsaCert.
    // 0:  Granted and verified.
    // 1: Granted and verified, with mods (see RFC 3161)
    // 2: Rejected.
    // 3: Waiting.
    // 4: Revocation Warning
    // 5: Revocation Notification
    Get pvComObject of hoTimestampReply to vTimestampReply
    Get pvComObject of hoTsaCert to vTsaCert
    Get ComVerifyTimestampReply Of hoHttp vTimestampReply vTsaCert To iPkiStatus
    If (iPkiStatus < 0) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Showln "pkiStatus = " iPkiStatus

    Get ComLastJsonData Of hoHttp To vJson
    If (IsComObject(vJson)) Begin
        Get Create (RefClass(cComChilkatJsonObject)) To hoJson
        Set pvComObject Of hoJson To vJson
    End
    Set ComEmitCompact Of hoJson To False
    Get ComEmit Of hoJson To sTemp1
    Showln sTemp1

    // The LastJsonData looks like the following.
    // Note: The "timestampReply.pkiStatus" portion of the LastJsonData was added in Chilkat v9.5.0.83

    // Use this online tool to generate parsing code from sample JSON: 
    // Generate Parsing Code from JSON

    // {
    //   "timestampReply": {
    //     "pkiStatus": {
    //       "value": 0,
    //       "meaning": "granted"
    //     }
    //   },
    //   "pkcs7": {
    //     "verify": {
    //       "digestAlgorithms": [
    //         "sha256"
    //       ],
    //       "signerInfo": [
    //         {
    //           "cert": {
    //             "serialNumber": "04CD3F8568AE76C61BB0FE7160CCA76D",
    //             "issuerCN": "DigiCert SHA2 Assured ID Timestamping CA",
    //             "digestAlgOid": "2.16.840.1.101.3.4.2.1",
    //             "digestAlgName": "SHA256"
    //           },
    //           "contentType": "1.2.840.113549.1.9.16.1.4",
    //           "signingTime": "200405023019Z",
    //           "messageDigest": "f14zOsdnN9vyyV3HjjBiLzNDi1PF28hAFMODxNkNRZs=",
    //           "signingAlgOid": "1.2.840.113549.1.1.1",
    //           "signingAlgName": "RSA-PKCSV-1_5",
    //           "authAttr": {
    //             "1.2.840.113549.1.9.3": {
    //               "name": "contentType",
    //               "oid": "1.2.840.113549.1.9.16.1.4"
    //             },
    //             "1.2.840.113549.1.9.5": {
    //               "name": "signingTime",
    //               "utctime": "200405023019Z"
    //             },
    //             "1.2.840.113549.1.9.16.2.12": {
    //               "name": "signingCertificate",
    //               "der": "MBowGDAWBBQDJb1QXtqWMC3CL0+gHkwovig0xQ=="
    //             },
    //             "1.2.840.113549.1.9.4": {
    //               "name": "messageDigest",
    //               "digest": "f14zOsdnN9vyyV3HjjBiLzNDi1PF28hAFMODxNkNRZs="
    //             }
    //           }
    //         }
    //       ]
    //     }
    //   }
    // }

    Get Create (RefClass(cComChilkatDtObj)) To hoSigningTime
    If (Not(IsComObjectCreated(hoSigningTime))) Begin
        Send CreateComObject of hoSigningTime
    End
    Get Create (RefClass(cComChilkatDtObj)) To hoAuthAttrSigningTimeUtctime
    If (Not(IsComObjectCreated(hoAuthAttrSigningTimeUtctime))) Begin
        Send CreateComObject of hoAuthAttrSigningTimeUtctime
    End

    Get ComIntOf Of hoJson "timestampReply.pkiStatus.value" To iTimestampReplyPkiStatusValue
    Get ComStringOf Of hoJson "timestampReply.pkiStatus.meaning" To sTimestampReplyPkiStatusMeaning
    Move 0 To i
    Get ComSizeOfArray Of hoJson "pkcs7.verify.digestAlgorithms" To iCount_i
    While (i < iCount_i)
        Set ComI Of hoJson To i
        Get ComStringOf Of hoJson "pkcs7.verify.digestAlgorithms[i]" To sStrVal
        Move (i + 1) To i
    Loop

    Move 0 To i
    Get ComSizeOfArray Of hoJson "pkcs7.verify.signerInfo" To iCount_i
    While (i < iCount_i)
        Set ComI Of hoJson To i
        Get ComStringOf Of hoJson "pkcs7.verify.signerInfo[i].cert.serialNumber" To sCertSerialNumber
        Get ComStringOf Of hoJson "pkcs7.verify.signerInfo[i].cert.issuerCN" To sCertIssuerCN
        Get ComStringOf Of hoJson "pkcs7.verify.signerInfo[i].cert.digestAlgOid" To sCertDigestAlgOid
        Get ComStringOf Of hoJson "pkcs7.verify.signerInfo[i].cert.digestAlgName" To sCertDigestAlgName
        Get ComStringOf Of hoJson "pkcs7.verify.signerInfo[i].contentType" To sContentType
        Get pvComObject of hoSigningTime to vSigningTime
        Get ComDtOf Of hoJson "pkcs7.verify.signerInfo[i].signingTime" False vSigningTime To iSuccess
        Get ComStringOf Of hoJson "pkcs7.verify.signerInfo[i].messageDigest" To sMessageDigest
        Get ComStringOf Of hoJson "pkcs7.verify.signerInfo[i].signingAlgOid" To sSigningAlgOid
        Get ComStringOf Of hoJson "pkcs7.verify.signerInfo[i].signingAlgName" To sSigningAlgName
        Get ComStringOf Of hoJson 'pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.3".name' To sAuthAttrContentTypeName
        Get ComStringOf Of hoJson 'pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.3".oid' To sAuthAttrContentTypeOid
        Get ComStringOf Of hoJson 'pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.5".name' To sAuthAttrSigningTimeName
        Get pvComObject of hoAuthAttrSigningTimeUtctime to vAuthAttrSigningTimeUtctime
        Get ComDtOf Of hoJson 'pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.5".utctime' False vAuthAttrSigningTimeUtctime To iSuccess
        Get ComStringOf Of hoJson 'pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.16.2.12".name' To sAuthAttrSigningCertificateName
        Get ComStringOf Of hoJson 'pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.16.2.12".der' To sAuthAttrSigningCertificateDer
        Get ComStringOf Of hoJson 'pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.4".name' To sAuthAttrMessageDigestName
        Get ComStringOf Of hoJson 'pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.4".digest' To sAuthAttrMessageDigestDigest
        Move (i + 1) To i
    Loop

    Send Destroy of hoJson


End_Procedure