(C++) 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.

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#include <CkCrypt2.h>
#include <CkHttp.h>
#include <CkBinData.h>
#include <CkHttpResponse.h>
#include <CkCert.h>
#include <CkJsonObject.h>
#include <CkDtObj.h>

void ChilkatSample(void)
    {
    // 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"
    bool success;
    CkCrypt2 crypt;
    crypt.put_HashAlgorithm("sha256");
    crypt.put_EncodingMode("base64");
    const char *base64Hash = crypt.hashStringENC("Hello World");

    CkHttp http;

    CkBinData requestToken;
    const char *optionalPolicyOid = "";
    bool addNonce = false;
    bool requestTsaCert = true;

    // Create a time-stamp request token
    success = http.CreateTimestampRequest("sha256",base64Hash,optionalPolicyOid,addNonce,requestTsaCert,requestToken);
    if (success != true) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }

    // 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
    const char *tsaUrl = "https://freetsa.org/tsr";
    // Another timestamp server you could try is: http://timestamp.digicert.com
    tsaUrl = "http://timestamp.digicert.com";
    CkHttpResponse *resp = http.PBinaryBd("POST",tsaUrl,requestToken,"application/timestamp-query",false,false);
    if (http.get_LastMethodSuccess() != true) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }

    // Get the timestamp reply from the HTTP response object.
    CkBinData timestampReply;
    resp->GetBodyBd(timestampReply);
    delete resp;

    // Show the base64 encoded timestamp reply.
    std::cout << timestampReply.getEncoded("base64") << "\r\n";

    // Let's verify the timestamp reply against the TSA's cert, which we've previously downloaded.
    // See https://freetsa.org/index_en.php
    CkCert tsaCert;
    success = tsaCert.LoadFromFile("qa_data/certs/freetsa.org.cer");
    if (success != true) {
        std::cout << tsaCert.lastErrorText() << "\r\n";
        return;
    }

    // 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
    int pkiStatus = http.VerifyTimestampReply(timestampReply,tsaCert);
    if (pkiStatus < 0) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "pkiStatus = " << pkiStatus << "\r\n";

    CkJsonObject *json = http.LastJsonData();
    json->put_EmitCompact(false);
    std::cout << json->emit() << "\r\n";

    // 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="
    //             }
    //           }
    //         }
    //       ]
    //     }
    //   }
    // }

    // Chilkat functions returning "const char *" return a pointer to temporary internal memory owned and managed by Chilkat.
    // See this example explaining how this memory should be used: const char * functions.

    CkDtObj signingTime;
    CkDtObj authAttrSigningTimeUtctime;
    const char *strVal = 0;
    const char *certSerialNumber = 0;
    const char *certIssuerCN = 0;
    const char *certDigestAlgOid = 0;
    const char *certDigestAlgName = 0;
    const char *contentType = 0;
    const char *messageDigest = 0;
    const char *signingAlgOid = 0;
    const char *signingAlgName = 0;
    const char *authAttrContentTypeName = 0;
    const char *authAttrContentTypeOid = 0;
    const char *authAttrSigningTimeName = 0;
    const char *authAttrSigningCertificateName = 0;
    const char *authAttrSigningCertificateDer = 0;
    const char *authAttrMessageDigestName = 0;
    const char *authAttrMessageDigestDigest = 0;

    int timestampReplyPkiStatusValue = json->IntOf("timestampReply.pkiStatus.value");
    const char *timestampReplyPkiStatusMeaning = json->stringOf("timestampReply.pkiStatus.meaning");
    int i = 0;
    int count_i = json->SizeOfArray("pkcs7.verify.digestAlgorithms");
    while (i < count_i) {
        json->put_I(i);
        strVal = json->stringOf("pkcs7.verify.digestAlgorithms[i]");
        i = i + 1;
    }

    i = 0;
    count_i = json->SizeOfArray("pkcs7.verify.signerInfo");
    while (i < count_i) {
        json->put_I(i);
        certSerialNumber = json->stringOf("pkcs7.verify.signerInfo[i].cert.serialNumber");
        certIssuerCN = json->stringOf("pkcs7.verify.signerInfo[i].cert.issuerCN");
        certDigestAlgOid = json->stringOf("pkcs7.verify.signerInfo[i].cert.digestAlgOid");
        certDigestAlgName = json->stringOf("pkcs7.verify.signerInfo[i].cert.digestAlgName");
        contentType = json->stringOf("pkcs7.verify.signerInfo[i].contentType");
        json->DtOf("pkcs7.verify.signerInfo[i].signingTime",false,signingTime);
        messageDigest = json->stringOf("pkcs7.verify.signerInfo[i].messageDigest");
        signingAlgOid = json->stringOf("pkcs7.verify.signerInfo[i].signingAlgOid");
        signingAlgName = json->stringOf("pkcs7.verify.signerInfo[i].signingAlgName");
        authAttrContentTypeName = json->stringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\".name");
        authAttrContentTypeOid = json->stringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\".oid");
        authAttrSigningTimeName = json->stringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.5\".name");
        json->DtOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.5\".utctime",false,authAttrSigningTimeUtctime);
        authAttrSigningCertificateName = json->stringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.16.2.12\".name");
        authAttrSigningCertificateDer = json->stringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.16.2.12\".der");
        authAttrMessageDigestName = json->stringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\".name");
        authAttrMessageDigestDigest = json->stringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\".digest");
        i = i + 1;
    }

    delete json;
    }