content: /*
   * CDDL HEADER START
   *
   * The contents of this file are subject to the terms of the Common Development
   * and Distribution License (the "License").
   * You may not use this file except in compliance with the License.
   *
   * You can obtain a copy of the license at
   * src/com/vodafone360/people/VODAFONE.LICENSE.txt or
   * http://github.com/360/360-Engine-for-Android
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *
   * When distributing Covered Code, include this CDDL HEADER in each file and
   * include the License file at src/com/vodafone360/people/VODAFONE.LICENSE.txt.
   * If applicable, add the following below this CDDL HEADER, with the fields
   * enclosed by brackets "[]" replaced with your own identifying information:
   * Portions Copyright [yyyy] [name of copyright owner]
   *
   * CDDL HEADER END
   *
   * Copyright 2010 Vodafone Sales & Services Ltd.  All rights reserved.
   * Use is subject to license terms.
   */
  
  package com.vodafone360.people.database.utils;
  
  import java.security.InvalidKeyException;
  import java.security.NoSuchAlgorithmException;
  
  import javax.crypto.BadPaddingException;
  import javax.crypto.Cipher;
  import javax.crypto.IllegalBlockSizeException;
  import javax.crypto.NoSuchPaddingException;
  import javax.crypto.spec.SecretKeySpec;
  
  import com.vodafone360.people.utils.LogUtils;
  
  /**
   * EncryptionUtils... This is a utility class for credentials encrypting in
   * database
   * 
   * @author -
   */
  
  public class EncryptionUtils {
      /**
       * the Cipher
       */
      private static Cipher sCipher;
  
      /**
       * secret key
       */
      private static SecretKeySpec sKeySpec;
  
      /**
       * error definintions
       */
      private static final String ERROR_INVALIDKEY = "EncryptionUtils.encryptPassword() InvalidKeyException";
  
      /**
       * error definintions
       */
      private static final String ERROR_ILLEGALBLOCK = "EncryptionUtils.encryptPassword() IllegalBlockSizeException";
  
      /**
       * error definintions
       */
      private static final String ERROR_BADPADDING = "EncryptionUtils.encryptPassword() BadPaddingException";
  
      /**
       * error definintions
       */
      private static final String ERROR_ILLEGALSTATEEXCEPTION = "EncryptionUtils.encryptPassword() IllegalStateException";
  
      /**
       * the hard coded key
       */
      private static final byte[] KEY_BYTES = {
              82, 45, 44, 77, -100, 44, -120, 42, 72, 5, 29, 127, -124, 22, 21, 101, 22, 33, 44, 55,
              66, 77, 88, 99, 102, -103, -44, -22, -11, -5, 10, 22,
      };
  
      /**
       * Encrypting the password.
       * 
       * @param password string password
       * @return byte array containing encrypted password, return NULL if supplied
       *         password Strind is NULL, or an exception is thrown.
       * @throws BadPaddingException.
       * @throws IllegalBlockSizeException.
       * @throws InvalidKeyException.
       */
      public synchronized static byte[] encryptPassword(String password) {
          if (!createCipher()) {
              return null;
          }
          try {
              if (password == null) {
                  return null;
              }
              sCipher.init(Cipher.ENCRYPT_MODE, sKeySpec);
              return sCipher.doFinal(password.getBytes());
          } catch (InvalidKeyException e) {
              LogUtils.logE(ERROR_INVALIDKEY, e);
              return null;
          } catch (IllegalBlockSizeException e) {
              LogUtils.logE(ERROR_ILLEGALBLOCK, e);
              return null;
          } catch (BadPaddingException e) {
              LogUtils.logE(ERROR_BADPADDING, e);
              return null;
          } catch (IllegalStateException e) {
              LogUtils.logE(ERROR_ILLEGALSTATEEXCEPTION, e);
              return null;
          }
      }
  
      /**
       * Decryption of the password.
       * 
       * @param passwordEn password in bytes
       * @return string
       */
      public synchronized static String decryptPassword(byte[] passwordEn) {
          if (!createCipher()) {
              return null;
          }
          try {
              if (passwordEn == null) {
                  return null;
              }
              sCipher.init(Cipher.DECRYPT_MODE, sKeySpec);
              return new String(sCipher.doFinal(passwordEn));
          } catch (InvalidKeyException e) {
              LogUtils.logE(ERROR_INVALIDKEY, e);
              return null;
          } catch (IllegalBlockSizeException e) {
              LogUtils.logE(ERROR_ILLEGALBLOCK, e);
              return null;
          } catch (BadPaddingException e) {
              LogUtils.logE(ERROR_BADPADDING, e);
              return null;
          } catch (IllegalStateException e) {
              LogUtils.logE(ERROR_ILLEGALSTATEEXCEPTION, e);
              return null;
          }
      }
  
      /**
       * Creation of Cipher
       * 
       * @return true if cipher created otherwise false
       */
      private static boolean createCipher() {
          if (sCipher != null) {
              return true;
          }
          try {
              final String standard = "AES";
              sCipher = Cipher.getInstance(standard);
              sKeySpec = new SecretKeySpec(KEY_BYTES, standard);
          } catch (NoSuchAlgorithmException e) {
              LogUtils.logE("EncryptionUtils.encryptPassword() Create Cipher failed", e);
              return false;
          } catch (NoSuchPaddingException e) {
              LogUtils.logE("EncryptionUtils.encryptPassword() "
                      + "Create Cipher failed - NoSuchPaddingException", e);
              return false;
          }
          return true;
      }
  
  }
  