Android™

Authenticode Sign using Smartcard or USB Token

See more Code Signing Examples

Demonstrates how to Authenticode sign an EXE or DLL using a smartcard or USB token, such as a Yubikey.

Note: Chilkat's code signing class was added in v9.5.0.97

Android™

// 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 example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // First create the following JSON to specify that SHA256 is to be used,
    // and provide timestamp server information.

    // {
    //   "hashAlg": "sha256",
    //   "timestampToken": {
    //     "enabled": true,
    //     "tsaUrl": "http://timestamp.digicert.com",
    //     "requestTsaCert": true,
    //     "hashAlg": "sha256"
    //   }
    // }

    CkJsonObject json = new CkJsonObject();
    json.UpdateString("hashAlg","sha256");
    json.UpdateBool("timestampToken.enabled",true);
    json.UpdateString("timestampToken.tsaUrl","http://timestamp.digicert.com");
    json.UpdateBool("timestampToken.requestTsaCert",true);
    json.UpdateString("timestampToken.hashAlg","sha256");

    // The only difference in signing with a smartcard or USB token
    // is that the cert is loaded from a smartcard or USB token, instead of a PFX or from elsewhere
    // such as from the Windows certificate store.
    CkCert cert = new CkCert();

    // Yubico YubiKey OTP+FIDO+CCID 0, default PIN = 123456
    cert.put_SmartCardPin("123456");

    // Assuming you have the Yubikey inserted into the USB on the computer...
    // and there is only 1 signing certificate on the Yubikey, then just load from
    // the "smartcard".  (assuming you don't have additional smartcards or USB tokens plugged in)
    success = cert.LoadFromSmartcard("");
    if (success == false) {
        Log.i(TAG, cert.lastErrorText());
        return;
        }

    // If the smartcard/token has several possible certificates that can be used for signing,
    // then see the online documentation for the LoadFromSmartcard method,
    // and also see the online documentation and examples for Chilkat Pkcs11 and ScMinidriver.
    // There are many possible ways to load a Chilkat certificate object with a cert (and associated private key)
    // from a variety of sources.  The only coding difference for any signing function in Chilkat,
    // whether it be a PDF, XmlDSig, CMS, etc. is in how the cert is loaded.

    // You can sign .exe or .dll files.
    String exePath = "C:/someOtherDir/HelloWorld.exe";

    CkCodeSign signer = new CkCodeSign();

    // If successful, the following call will apply the signature to the EXE (or DLL).
    success = signer.AddSignature(exePath,cert,json);
    if (success == false) {
        Log.i(TAG, signer.lastErrorText());
        return;
        }

    Log.i(TAG, "Successfully applied the Authenticode signature.");

  }

  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."
  }
}