(Android™) 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 Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // 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"
    boolean success;
    CkCrypt2 crypt = new CkCrypt2();
    crypt.put_HashAlgorithm("sha256");
    crypt.put_EncodingMode("base64");
    String base64Hash = crypt.hashStringENC("Hello World");

    CkHttp http = new CkHttp();

    CkBinData requestToken = new CkBinData();
    String optionalPolicyOid = "";
    boolean addNonce = false;
    boolean requestTsaCert = true;

    // Create a time-stamp request token
    success = http.CreateTimestampRequest("sha256",base64Hash,optionalPolicyOid,addNonce,requestTsaCert,requestToken);
    if (success != true) {
        Log.i(TAG, 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";
    CkHttpResponse resp = http.PBinaryBd("POST",tsaUrl,requestToken,"application/timestamp-query",false,false);
    if (http.get_LastMethodSuccess() != true) {
        Log.i(TAG, http.lastErrorText());
        return;
        }

    // Get the timestamp reply from the HTTP response object.
    CkBinData timestampReply = new CkBinData();
    resp.GetBodyBd(timestampReply);

    // Show the base64 encoded timestamp reply.
    Log.i(TAG, 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
    CkCert tsaCert = new CkCert();
    success = tsaCert.LoadFromFile("qa_data/certs/freetsa.org.cer");
    if (success != true) {
        Log.i(TAG, 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) {
        Log.i(TAG, http.lastErrorText());
        return;
        }

    Log.i(TAG, "pkiStatus = " + String.valueOf(pkiStatus));

    CkJsonObject json = http.LastJsonData();
    json.put_EmitCompact(false);
    Log.i(TAG, 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="
    //             }
    //           }
    //         }
    //       ]
    //     }
    //   }
    // }

    CkDtObj signingTime = new CkDtObj();
    CkDtObj authAttrSigningTimeUtctime = new CkDtObj();
    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.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;
        }


  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}