Android Open Source - ivotingverification Brute Force Activity

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License

The source code is released under:
GNU General Public License
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Java Source Code

/**
 * Copyright (C) 2013 Eesti Vabariigi Valimiskomisjon 
 * (Estonian National Electoral Committee), www.vvk.ee
 *//from   w  w w.j  ava2  s.  c  o m
 * Written in 2013 by AS Finestmedia, www.finestmedia.ee
 * 
 * Vote-verification application for Estonian Internet voting system
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 **/
 
package ee.vvk.ivotingverification;

import java.security.Security;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;

import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.graphics.drawable.GradientDrawable;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.widget.ListView;
import android.widget.TextView;
import ee.vvk.ivotingverification.adapter.CandidatesListAdapter;
import ee.vvk.ivotingverification.dialog.LoadingSpinner;
import ee.vvk.ivotingverification.model.Vote;
import ee.vvk.ivotingverification.model.Vote.Candidate;
import ee.vvk.ivotingverification.util.C;
import ee.vvk.ivotingverification.util.Crypto;
import ee.vvk.ivotingverification.util.RegexMatcher;
import ee.vvk.ivotingverification.util.Util;

/**
 * Brute force analysis of the vote.
 * 
 * @version 28.05.2013
 */
public class BruteForceActivity extends Activity {

  private static final String TAG = BruteForceActivity.class.getSimpleName();

  private String qrCode;
  private String webResult;
  private String versionNumber;

  private String publicKey;
  private ListView list;
  private Vote vote;
  private TextView lblChoice;
  private View lblShadow;
  private TextView lblCloseTimeout;
  private View lblcloseTimeoutShadow;
  private CustomCountDownTimer countDownTimer;
  private LoadingSpinner mLoadingSpinner;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    requestWindowFeature(Window.FEATURE_NO_TITLE);

    Security.removeProvider(ext.org.bouncycastle.jce.provider.BouncyCastleProvider.PROVIDER_NAME);
    Security.addProvider(new ext.org.bouncycastle.jce.provider.BouncyCastleProvider());
    setContentView(R.layout.bruteforce_activity);

    countDownTimer = new CustomCountDownTimer(C.closeTimeout,
        C.closeInterval);

    Intent intent = getIntent();
    qrCode = intent.getStringExtra(Util.QR_CODE);
    webResult = intent.getStringExtra(Util.WEB_RESULT);
    versionNumber = intent.getStringExtra(Util.VERSION_NUMBER);

    list = (ListView) findViewById(R.id.list);

    lblChoice = (TextView) findViewById(R.id.choice_title_label);
    lblChoice.setText(C.lblChoice);
    lblChoice.setTypeface(C.typeFace);
    lblChoice.setTextColor(Util.generateHexColorValue(C.lblForeground));
    lblChoice.setBackgroundColor(Util
        .generateHexColorValue(C.lblBackground));

    lblShadow = (View) findViewById(R.id.choice_title_label_shadow);
    lblShadow.setBackgroundColor(Util.generateHexColorValue(C.lblShadow));

    lblCloseTimeout = (TextView) findViewById(R.id.close_timeout_label);
    lblCloseTimeout.setTypeface(C.typeFace);
    lblCloseTimeout.setText(C.lblCloseTimeout);
    lblCloseTimeout.setTextColor(Util
        .generateHexColorValue(C.lblCloseTimeoutForeground));
    int colors[] = new int[3];
    colors[0] = Util
        .generateHexColorValue(C.lblCloseTimeoutBackgroundStart);
    colors[1] = Util
        .generateHexColorValue(C.lblCloseTimeoutBackgroundCenter);
    colors[2] = Util.generateHexColorValue(C.lblCloseTimeoutBackgroundEnd);

    GradientDrawable bgCloseTimeoutShape = new GradientDrawable(
        GradientDrawable.Orientation.TOP_BOTTOM, colors);
    bgCloseTimeoutShape.setCornerRadius(5);
    lblCloseTimeout.setBackgroundDrawable(bgCloseTimeoutShape);

    lblcloseTimeoutShadow = (View) findViewById(R.id.close_timeout_label_shadow);
    GradientDrawable bgCloseTimeoutShadowShape = (GradientDrawable) lblcloseTimeoutShadow
        .getBackground();
    bgCloseTimeoutShadowShape.setColor(Util
        .generateHexColorValue(C.lblCloseTimeoutShadow));
    bgCloseTimeoutShadowShape.setCornerRadius(5);

    lblChoice.setVisibility(View.INVISIBLE);
    lblShadow.setVisibility(View.INVISIBLE);
    lblCloseTimeout.setVisibility(View.INVISIBLE);
    lblcloseTimeoutShadow.setVisibility(View.INVISIBLE);

    publicKey = C.publicKey;
    doBruteForce();
  }

  abstract class GetBruteForceTask extends
      AsyncTask<Void, Void, ArrayList<Candidate>> {

    @Override
    protected void onPreExecute() {
      mLoadingSpinner = Util.startSpinner(BruteForceActivity.this, false);
    }

    @Override
    protected void onPostExecute(ArrayList<Candidate> candidates) {

      if (candidates != null && candidates.size() > 0) {

        CandidatesListAdapter adapter = new CandidatesListAdapter(
            getApplicationContext(), candidates, vote);
        list.setAdapter(adapter);

        Util.stopSpinner(mLoadingSpinner);
        sendNotification(C.notificationTitle, C.notificationMessage);

        lblChoice.setVisibility(View.VISIBLE);
        lblShadow.setVisibility(View.VISIBLE);
        lblCloseTimeout.setVisibility(View.VISIBLE);
        lblcloseTimeoutShadow.setVisibility(View.VISIBLE);

        countDownTimer.start();
      } else {
        Util.startErrorIntent(BruteForceActivity.this,
            C.badVerificationMessage, true);
      }
    }
  }

  @Override
  protected void onDestroy() {
    super.onDestroy();
    ((NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE))
        .cancel(1000123);
    if (countDownTimer != null) {
      countDownTimer.cancel();
    }
  }

  private void doBruteForce() {
    new GetBruteForceTask() {

      @Override
      protected ArrayList<Candidate> doInBackground(Void... arg0) {
        try {
          if (Util.DEBUGGABLE) {
            Log.d("QR_CODE", qrCode);
          }

          ArrayList<Candidate> candidates = new ArrayList<Vote.Candidate>();

          vote = new Vote();
          vote.parseHeader(webResult);
          List<Candidate> cands = vote.parseBody(webResult);
          String newEnc = "";

          if (qrCode.split("\n").length > 1) {
            for (int i = 1; i < qrCode.split("\n").length; i++) {
              String hexControlCode = qrCode.split("\n")[i]
                  .split("\t")[1].split("\n")[0];
              if (!RegexMatcher.IsFortyCharacters(hexControlCode)) {
                Util.startErrorIntent(BruteForceActivity.this,
                    C.badServerResponseMessage, true);
              }
              String electionId = qrCode.split("\n")[i]
                  .split("\t")[0];

              newEnc = vote.encBallots.get(electionId)
                  .replaceAll("\n", "");

              if (Util.DEBUGGABLE) {
                Log.d(TAG, electionId);
                Log.d(TAG, hexControlCode);
                Log.d(TAG, newEnc);
              }

              for (Candidate c : cands) {

                String decodedVote = versionNumber + "\n"
                    + electionId + "\n" + c.number + "\n";

                String bruteenc = new String(
                    Crypto.encrypt(decodedVote,
                        hexControlCode, publicKey),
                    Util.ENCODING);

                if (newEnc.equals(bruteenc)) {
                  candidates.add(c);
                }
              }
            }
          }
          return candidates;

        } catch (Exception e) {
          if (Util.DEBUGGABLE) {
            Log.d(TAG, "Error: " + e.getMessage(), e);
          }
          return null;
        }
      }
    }.execute();
  }

  public class CustomCountDownTimer extends CountDownTimer {

    public CustomCountDownTimer(long startTime, long interval) {
      super(startTime, interval);
    }

    @Override
    public void onFinish() {
      Intent intent = new Intent(getApplicationContext(),
          MainActivity.class);
      intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
      intent.putExtra(Util.EXIT, true);
      ((NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE))
          .cancel(1000123);
      startActivity(intent);
    }

    @Override
    public void onTick(long millisUntilFinished) {
      lblCloseTimeout.setText(C.lblCloseTimeout.replace("XX", String
          .valueOf(TimeUnit.MILLISECONDS
              .toSeconds(millisUntilFinished))));
    }
  }

  private void sendNotification(String notificationTitle,
      String notificationMessage) {
    Notification notification = new Notification(R.drawable.icon,
        C.notificationMessage, System.currentTimeMillis());

    Intent notificationIntent = new Intent(this, BruteForceActivity.class);
    notificationIntent.setFlags(Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);

    PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
        notificationIntent, PendingIntent.FLAG_ONE_SHOT);

    notification.defaults |= Notification.DEFAULT_SOUND;
    notification.defaults |= Notification.DEFAULT_VIBRATE;
    notification.flags |= Notification.FLAG_AUTO_CANCEL;

    notification.setLatestEventInfo(BruteForceActivity.this,
        notificationTitle, notificationMessage, contentIntent);

    ((NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE))
        .notify(1000123, notification);
  }
}
Java Source Code List
