Android Open Source - nsa-away Enter Plaintext Activity

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Copyright 2014 individual contributors as indicated by the @author 
 * tags/*from w w  w  . ja  v a2 s.  c o  m*/
 * 
 * This 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 software 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 software.  If not, see <http://www.gnu.org/licenses/>. 
 */
package org.sector67.nsaaway;

import org.sector67.nsaaway.android.AlertUtils;
import org.sector67.nsaaway.key.KeyUtils;
import org.sector67.otp.cipher.CipherException;
import org.sector67.otp.cipher.OneTimePadCipher;
import org.sector67.otp.encoding.EncodingException;
import org.sector67.otp.encoding.SimpleBase16Encoder;
import org.sector67.otp.key.KeyException;
import org.sector67.otp.key.KeyStore;

import android.app.Activity;
import android.app.DialogFragment;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

/**
 * 
 * @author scott.hasse@gmail.com
 * 
 */
public class EnterPlaintextActivity extends Activity implements
    KeyChooserDialogFragment.KeyChooserDialogListener {

  private String keyName;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_enter_plaintext);

    SharedPreferences sharedPref = PreferenceManager
        .getDefaultSharedPreferences(this);
    String defaultEncryptKey = sharedPref.getString(
        SettingsActivity.KEY_PREF_DEFAULT_ENCRYPT_KEY, "");

    onKeyChoice(defaultEncryptKey);

    Button chooseKeyForEncryptionButton = (Button) findViewById(R.id.chooseKeyForEncryptionButton);
    Button encryptTextButton = (Button) findViewById(R.id.encryptTextButton);

    encryptTextButton.setOnClickListener(new View.OnClickListener() {
      public void onClick(View arg0) {
        String ciphertext = "";
        int offset = -1;
        int length = -1;
        try {
          EditText txtInput = (EditText) findViewById(R.id.plaintextEditText);
          String plaintext = txtInput.getText().toString();
          KeyStore ks = KeyUtils.getKeyStore(getApplicationContext());
          OneTimePadCipher cipher = new OneTimePadCipher(ks);
          offset = ks.getCurrentOffset(keyName);
          byte[] encrypted = cipher.encrypt(keyName, plaintext);
          length = encrypted.length;
          SimpleBase16Encoder encoder = new SimpleBase16Encoder();
          //TODO: get from prefs
          encoder.setMajorChunkSeparator("\n");
          encoder.setMinorChunkSeparator(" ");
          encoder.setMajorChunkSize(6);
          encoder.setMinorChunkSize(1);
          ciphertext = encoder.encode(encrypted);
          //TODO: sph upper/lower case configurable?  or entire alphabet configurable?
          ciphertext = ciphertext.toLowerCase();
          //clear the text input so navigating back cannot recover it
          txtInput.setText("");
        } catch (KeyException e) {
          AlertUtils
          .createAlert(
              getString(R.string.error_encrypting_message),
              e.getMessage(),
              EnterPlaintextActivity.this).show();
          return;
        } catch (CipherException e) {
          AlertUtils
          .createAlert(
              getString(R.string.error_encrypting_message),
              e.getMessage(),
              EnterPlaintextActivity.this).show();
          return;
        } catch (EncodingException e) {
          AlertUtils
          .createAlert(
              getString(R.string.error_encrypting_message),
              e.getMessage(),
              EnterPlaintextActivity.this).show();
          return;
        }

        Intent nextScreen = new Intent(getApplicationContext(),
            DisplayCiphertextActivity.class);
        nextScreen.putExtra(MainActivity.CIPHERTEXT_KEY, ciphertext);
        nextScreen.putExtra(MainActivity.OFFSET_KEY, offset);
        nextScreen.putExtra(MainActivity.LENGTH_KEY, length);
        nextScreen.putExtra(MainActivity.KEYNAME_KEY, keyName);
        
        

        startActivity(nextScreen);
      }
    });

    chooseKeyForEncryptionButton
        .setOnClickListener(new View.OnClickListener() {
          public void onClick(View arg0) {
            showKeyChooserDialog();
          }
        });

  }

  private void showKeyChooserDialog() {
    // Create an instance of the dialog fragment and show it
    DialogFragment dialog = new KeyChooserDialogFragment();
    dialog.show(getFragmentManager(), "NoticeDialogFragment");
  }

  /*
   * This method is called when a key is chosen
   */
  @Override
  public void onKeyChoice(String name) {
    TextView keyString = (TextView) findViewById(R.id.keyNameValue);
    this.keyName = name;
    keyString.setText(name);
  }

}

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