Android™
Android™
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 Android™ Downloads
// 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);
boolean success = false;
// 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"
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 == false) {
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 = new CkHttpResponse();
success = http.HttpBd("POST",tsaUrl,requestToken,"application/timestamp-query",resp);
if (success == false) {
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 == false) {
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 = new CkJsonObject();
http.GetLastJsonData(json);
json.put_EmitCompact(false);
Log.i(TAG, 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="
// }
// }
// }
// ]
// }
// }
// }
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."
}
}