Dart Requires Chilkat v11.0.0+
Dart
RFC3161 Timestamp Client - Fetch from Timestamp Authority (TSA) and Verify
See more HTTP Examples
Sends an RFC 3161 timestamp request to a TSA (Timestamp Authority) server and validates the timestamp token response.Chilkat Dart Downloads
import 'package:chilkat/chilkat.dart';
void main() {
// 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"
final crypt = CkCrypt2();
crypt.hashAlgorithm = 'sha256';
crypt.encodingMode = 'base64';
final base64Hash = crypt.hashStringENC('Hello World');
final http = CkHttp();
final requestToken = CkBinData();
final optionalPolicyOid = '';
final addNonce = false;
final requestTsaCert = true;
// Create a time-stamp request token
try {
http.createTimestampRequest('sha256', base64Hash, optionalPolicyOid, addNonce, requestTsaCert, requestToken);
} on ChilkatException catch (e) {
print(e.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 = 'https://freetsa.org/tsr';
// Another timestamp server you could try is: http://timestamp.digicert.com
tsaUrl = 'http://timestamp.digicert.com';
final resp = CkHttpResponse();
try {
http.httpBd('POST', tsaUrl, requestToken, 'application/timestamp-query', resp);
} on ChilkatException catch (e) {
print(e.lastErrorText);
return;
}
// Get the timestamp reply from the HTTP response object.
final timestampReply = CkBinData();
resp.getBodyBd(timestampReply);
// 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
final tsaCert = CkCert();
try {
tsaCert.loadFromFile('qa_data/certs/freetsa.org.cer');
} on ChilkatException catch (e) {
print(e.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
final pkiStatus = http.verifyTimestampReply(timestampReply, tsaCert);
if (pkiStatus < 0) {
print(http.lastErrorText);
return;
}
print('pkiStatus = $pkiStatus');
final json = CkJsonObject();
http.getLastJsonData(json);
json.emitCompact = false;
print(json.emit());
// The JSON looks like the following.
// 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="
// }
// }
// }
// ]
// }
// }
// }
final signingTime = CkDtObj();
final authAttrSigningTimeUtctime = CkDtObj();
var strVal = '';
var certSerialNumber = '';
var certIssuerCN = '';
var certDigestAlgOid = '';
var certDigestAlgName = '';
var contentType = '';
var messageDigest = '';
var signingAlgOid = '';
var signingAlgName = '';
var authAttrContentTypeName = '';
var authAttrContentTypeOid = '';
var authAttrSigningTimeName = '';
var authAttrSigningCertificateName = '';
var authAttrSigningCertificateDer = '';
var authAttrMessageDigestName = '';
var authAttrMessageDigestDigest = '';
final timestampReplyPkiStatusValue = json.intOf('timestampReply.pkiStatus.value');
final timestampReplyPkiStatusMeaning = json.stringOf('timestampReply.pkiStatus.meaning');
var i = 0;
var countI = json.sizeOfArray('pkcs7.verify.digestAlgorithms');
while (i < countI) {
json.i = i;
strVal = json.stringOf('pkcs7.verify.digestAlgorithms[i]');
i++;
}
i = 0;
countI = json.sizeOfArray('pkcs7.verify.signerInfo');
while (i < countI) {
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++;
}
}