(Swift 3,4,5...) 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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func chilkatTest() {
    // 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"
    var success: Bool
    let crypt = CkoCrypt2()!
    crypt.hashAlgorithm = "sha256"
    crypt.encodingMode = "base64"
    var base64Hash: String? = crypt.hashStringENC("Hello World")

    let http = CkoHttp()!

    let requestToken = CkoBinData()!
    var optionalPolicyOid: String? = ""
    var addNonce: Bool = false
    var requestTsaCert: Bool = true

    // Create a time-stamp request token
    success = http.createTimestampRequest("sha256", hashVal: base64Hash, reqPolicyOid: optionalPolicyOid, addNonce: addNonce, reqTsaCert: requestTsaCert, tmestampToken: requestToken)
    if success != true {
        print("\(http.lastErrorText!)")
        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
    var tsaUrl: String? = "https://freetsa.org/tsr"
    // Another timestamp server you could try is: http://timestamp.digicert.com
    tsaUrl = "http://timestamp.digicert.com"
    var resp: CkoHttpResponse? = http.pBinaryBd("POST", url: tsaUrl, data: requestToken, contentType: "application/timestamp-query", md5: false, gzip: false)
    if http.lastMethodSuccess != true {
        print("\(http.lastErrorText!)")
        return
    }

    // Get the timestamp reply from the HTTP response object.
    let timestampReply = CkoBinData()!
    resp!.getBodyBd(timestampReply)
    resp = nil

    // Show the base64 encoded timestamp reply.
    print("\(timestampReply.getEncoded("base64")!)")

    // Let's verify the timestamp reply against the TSA's cert, which we've previously downloaded.
    // See https://freetsa.org/index_en.php
    let tsaCert = CkoCert()!
    success = tsaCert.load(fromFile: "qa_data/certs/freetsa.org.cer")
    if success != true {
        print("\(tsaCert.lastErrorText!)")
        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
    var pkiStatus: Int = http.verifyTimestampReply(timestampReply, tsaCert: tsaCert).intValue
    if pkiStatus < 0 {
        print("\(http.lastErrorText!)")
        return
    }

    print("pkiStatus = \(pkiStatus)")

    var json: CkoJsonObject? = http.lastJsonData()
    json.emitCompact = false
    print("\(json!.emit()!)")

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

    let signingTime = CkoDtObj()!
    let authAttrSigningTimeUtctime = CkoDtObj()!
    var strVal: String?
    var certSerialNumber: String?
    var certIssuerCN: String?
    var certDigestAlgOid: String?
    var certDigestAlgName: String?
    var contentType: String?
    var messageDigest: String?
    var signingAlgOid: String?
    var signingAlgName: String?
    var authAttrContentTypeName: String?
    var authAttrContentTypeOid: String?
    var authAttrSigningTimeName: String?
    var authAttrSigningCertificateName: String?
    var authAttrSigningCertificateDer: String?
    var authAttrMessageDigestName: String?
    var authAttrMessageDigestDigest: String?

    var timestampReplyPkiStatusValue: Int = json!.int(of: "timestampReply.pkiStatus.value").intValue
    var timestampReplyPkiStatusMeaning: String? = json!.string(of: "timestampReply.pkiStatus.meaning")
    var i: Int = 0
    var count_i: Int = json!.size(ofArray: "pkcs7.verify.digestAlgorithms").intValue
    while i < count_i {
        json.i = i
        strVal = json!.string(of: "pkcs7.verify.digestAlgorithms[i]")
        i = i + 1
    }

    i = 0
    count_i = json!.size(ofArray: "pkcs7.verify.signerInfo").intValue
    while i < count_i {
        json.i = i
        certSerialNumber = json!.string(of: "pkcs7.verify.signerInfo[i].cert.serialNumber")
        certIssuerCN = json!.string(of: "pkcs7.verify.signerInfo[i].cert.issuerCN")
        certDigestAlgOid = json!.string(of: "pkcs7.verify.signerInfo[i].cert.digestAlgOid")
        certDigestAlgName = json!.string(of: "pkcs7.verify.signerInfo[i].cert.digestAlgName")
        contentType = json!.string(of: "pkcs7.verify.signerInfo[i].contentType")
        json!.dt(of: "pkcs7.verify.signerInfo[i].signingTime", bLocal: false, dt: signingTime)
        messageDigest = json!.string(of: "pkcs7.verify.signerInfo[i].messageDigest")
        signingAlgOid = json!.string(of: "pkcs7.verify.signerInfo[i].signingAlgOid")
        signingAlgName = json!.string(of: "pkcs7.verify.signerInfo[i].signingAlgName")
        authAttrContentTypeName = json!.string(of: "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\".name")
        authAttrContentTypeOid = json!.string(of: "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\".oid")
        authAttrSigningTimeName = json!.string(of: "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.5\".name")
        json!.dt(of: "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.5\".utctime", bLocal: false, dt: authAttrSigningTimeUtctime)
        authAttrSigningCertificateName = json!.string(of: "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.16.2.12\".name")
        authAttrSigningCertificateDer = json!.string(of: "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.16.2.12\".der")
        authAttrMessageDigestName = json!.string(of: "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\".name")
        authAttrMessageDigestDigest = json!.string(of: "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\".digest")
        i = i + 1
    }

    json = nil

}