Android Open Source - nsa-away Create A Key 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 ww .jav a2s .  c om*/
 * 
 * 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 java.security.SecureRandom;
import java.util.Random;
import org.sector67.nsaaway.android.AlertUtils;
import org.sector67.nsaaway.key.KeyUtils;
import org.sector67.otp.key.KeyException;
import org.sector67.otp.key.KeyStore;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

/**
 * 
 * @author scott.hasse@gmail.com
 * 
 */
public class CreateAKeyActivity extends Activity {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_create_a_key);
    
    // Create a reference to the button to create a new key
    Button createNewKeyButton = (Button) findViewById(R.id.createNewKeyButton);
    
    // On clicking the `create new key` button
    createNewKeyButton.setOnClickListener(new View.OnClickListener() {
      // Don't complain about it not being a secure random
      @SuppressLint("TrulyRandom")
      public void onClick(View arg0) {
        try {
          // New variable to store the random object
          Random sr = null;
          //TODO bounds and null checking
          
          // Get the text editor field for the key name
          EditText newKeyNameEditText = (EditText) findViewById(R.id.newKeyNameEditText);
          String keyName = newKeyNameEditText.getText().toString(); // Make it into a string
          // If there's no string
          if (keyName == null || keyName.equals("")) { 
            // You need to specify a name
            throw new IllegalArgumentException("You must specify a key name");
          }
          // Get text field for key size
          EditText newKeySizeEditText = (EditText) findViewById(R.id.newKeySizeEditText);
          // Get the key length in an int
          int keyLength = Integer.parseInt(newKeySizeEditText.getText().toString());
          // If the key length is < 1
          if (keyLength < 1) {
            // It needs to be more
            throw new IllegalArgumentException("You must specify a valid key length");
          }
          // Get text field for key seed
          EditText newKeySeedEditText = (EditText) findViewById(R.id.newKeySeedEditText);
          String newKeySeedText = newKeySeedEditText.getText().toString(); // Get key seed in a string
          // If it's null
          if (newKeySeedText == null || newKeySeedText.equals("")) {
            // We don't need a seed
            sr = new SecureRandom();            
          } else {
            //This is for testing, SecureRandom produces different randomness even with
            //the same seed.  Again for testing only, not secure
            int keySeed = Integer.parseInt(newKeySeedText);
            sr = new Random(keySeed);            
          }
          // Zero the key offset
          int keyOffset = 0;
          // Get new key offset text field
          EditText newKeyOffsetEditText = (EditText) findViewById(R.id.newKeyOffsetEditText);
          String newKeyOffsetText = newKeyOffsetEditText.getText().toString(); // Put key offset in a string
          // If the key offset's not nothing
          if (newKeyOffsetText != null && !newKeyOffsetText.equals("")) {
            // Parse it
            keyOffset = Integer.parseInt(newKeyOffsetText);
          }

          // Variable for the bytes of the key
          byte[] keyBytes = new byte[keyLength];
          // Fill it up with random bytes
          sr.nextBytes(keyBytes);
          // Put it in the keystore
          KeyStore ks = KeyUtils.getKeyStore(getApplicationContext());
          ks.addKey(keyName, keyBytes, keyOffset);
          // Pop toast notification about newly created message
          Toast.makeText(getApplicationContext(), getString(R.string.new_key_created_message), Toast.LENGTH_SHORT).show();
        } catch (IllegalArgumentException e) {
          //this also catches NumberFormatException
          // Do an error toast on IllegalArgumentExecption
          Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_SHORT).show();
          AlertUtils
          .createAlert(
              getString(R.string.error_creating_key_message),
              e.getMessage(),
              CreateAKeyActivity.this).show();
          return;
        } catch (KeyException e) {
          // Do an error toast on KeyException
          AlertUtils
          .createAlert(
              getString(R.string.error_creating_key_message),
              e.getMessage(),
              CreateAKeyActivity.this).show();
          return;
        }
        //Intent nextScreen = new Intent(getApplicationContext(),
        //    KeyManagerActivity.class);
                
        //startActivity(nextScreen);
      }
    });

  }



}

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