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(C#) RFC3161 Timestamp Client - Fetch from Timestamp Authority (TSA) and VerifySends 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.
// 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; Chilkat.Crypt2 crypt = new Chilkat.Crypt2(); crypt.HashAlgorithm = "sha256"; crypt.EncodingMode = "base64"; string base64Hash = crypt.HashStringENC("Hello World"); Chilkat.Http http = new Chilkat.Http(); Chilkat.BinData requestToken = new Chilkat.BinData(); string 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) { Debug.WriteLine(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 string tsaUrl = "https://freetsa.org/tsr"; // Another timestamp server you could try is: http://timestamp.digicert.com tsaUrl = "http://timestamp.digicert.com"; Chilkat.HttpResponse resp = http.PBinaryBd("POST",tsaUrl,requestToken,"application/timestamp-query",false,false); if (http.LastMethodSuccess != true) { Debug.WriteLine(http.LastErrorText); return; } // Get the timestamp reply from the HTTP response object. Chilkat.BinData timestampReply = new Chilkat.BinData(); resp.GetBodyBd(timestampReply); // Show the base64 encoded timestamp reply. Debug.WriteLine(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 Chilkat.Cert tsaCert = new Chilkat.Cert(); success = tsaCert.LoadFromFile("qa_data/certs/freetsa.org.cer"); if (success != true) { Debug.WriteLine(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 int pkiStatus = http.VerifyTimestampReply(timestampReply,tsaCert); if (pkiStatus < 0) { Debug.WriteLine(http.LastErrorText); return; } Debug.WriteLine("pkiStatus = " + Convert.ToString(pkiStatus)); Chilkat.JsonObject json = http.LastJsonData(); json.EmitCompact = false; Debug.WriteLine(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=" // } // } // } // ] // } // } // } Chilkat.DtObj signingTime = new Chilkat.DtObj(); Chilkat.DtObj authAttrSigningTimeUtctime = new Chilkat.DtObj(); string strVal; string certSerialNumber; string certIssuerCN; string certDigestAlgOid; string certDigestAlgName; string contentType; string messageDigest; string signingAlgOid; string signingAlgName; string authAttrContentTypeName; string authAttrContentTypeOid; string authAttrSigningTimeName; string authAttrSigningCertificateName; string authAttrSigningCertificateDer; string authAttrMessageDigestName; string authAttrMessageDigestDigest; int timestampReplyPkiStatusValue = json.IntOf("timestampReply.pkiStatus.value"); string timestampReplyPkiStatusMeaning = json.StringOf("timestampReply.pkiStatus.meaning"); int i = 0; int count_i = json.SizeOfArray("pkcs7.verify.digestAlgorithms"); while (i < count_i) { json.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.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; } |
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