Android Open Source - myglob Crypto A E S

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License

The source code is released under:

GNU General Public License

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Java Source Code

/*
 * MyGlob Android Application/* www  . j  a  v  a2s .co  m*/
 * 
 * Copyright (C) 2010 Petar Petrov
 *
 * 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 net.vexelon.myglob.crypto;

import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class CryptoAES implements Crypto {
  
  private static CryptoAES INSTANCE = null; 
  
  private final static String ALGORITHM = "AES";
  private final static String TRANSFORM = "AES/CBC/PKCS5Padding";
  //private final static int KEY_SIZE = 256;
  
  private CryptoAES() {
  }
  
  public static Crypto getInstance() {
    if (INSTANCE == null) {
      INSTANCE = new CryptoAES();
      
      //INSTANCE.init(); // setup
    }
    return INSTANCE;
  }
  
  /**
   * Creates a secret key
   * @return encoded data of the created key
   */
  public byte[] createSecretKey(int keysize) 
    throws NoSuchAlgorithmException {
    
    KeyGenerator kg = KeyGenerator.getInstance(ALGORITHM);
    kg.init(keysize, new SecureRandom(
        String.valueOf(System.currentTimeMillis()).getBytes())
        );
    SecretKey key = kg.generateKey();
    
    return key.getEncoded();
  }

  @Override
  public byte[] decrypt(byte[] input, byte[] secretKey, byte[] iv)
    throws Exception {
    
    SecretKey key = new SecretKeySpec(secretKey, ALGORITHM);
    Cipher cipher = Cipher.getInstance(TRANSFORM);
    IvParameterSpec ips = new IvParameterSpec(iv);
    cipher.init(Cipher.DECRYPT_MODE, key, ips);
    return cipher.doFinal(input);
  }

  @Override
  public byte[] encrypt(byte[] input, byte[] secretKey, byte[] iv) 
    throws Exception {
    
    SecretKey key = new SecretKeySpec(secretKey, ALGORITHM);
    Cipher cipher = Cipher.getInstance(TRANSFORM);
    IvParameterSpec ips = new IvParameterSpec(iv);
    cipher.init(Cipher.ENCRYPT_MODE, key, ips);
    return cipher.doFinal(input);    
  }

}

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