Package com.elasticinbox.core.blob.encryption

Source Code of com.elasticinbox.core.blob.encryption.AESEncryptionHandler

/**
* Copyright (c) 2011-2012 Optimax Software Ltd.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
*  * Redistributions of source code must retain the above copyright notice,
*    this list of conditions and the following disclaimer.
*  * Redistributions in binary form must reproduce the above copyright notice,
*    this list of conditions and the following disclaimer in the documentation
*    and/or other materials provided with the distribution.
*  * Neither the name of Optimax Software, ElasticInbox, nor the names
*    of its contributors may be used to endorse or promote products derived
*    from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

package com.elasticinbox.core.blob.encryption;

import java.io.InputStream;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;

import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;

/**
* This class provides AES encryption/decryption methods.
*
* @author Rustam Aliyev
*/
public class AESEncryptionHandler implements EncryptionHandler
{
  /**
   * Use AES-CBC algorithm with PKCS5 padding
   */
  public static final String CIPHER_TRANSFORMATION = "AES/CBC/PKCS5Padding";

  public InputStream encrypt(InputStream in, Key key, byte[] iv)
      throws NoSuchAlgorithmException, NoSuchPaddingException,
      InvalidKeyException, InvalidAlgorithmParameterException, NoSuchProviderException
  {
    Cipher cipher = Cipher.getInstance(CIPHER_TRANSFORMATION);
    cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(iv));
   
    return new CipherInputStream(in, cipher);
  }

  public InputStream decrypt(InputStream in, Key key, byte[] iv)
      throws NoSuchAlgorithmException, NoSuchPaddingException,
      InvalidKeyException, InvalidAlgorithmParameterException, NoSuchProviderException
  {
    Cipher cipher = Cipher.getInstance(CIPHER_TRANSFORMATION);
    cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(iv));
   
    return new CipherInputStream(in, cipher);
  }
}
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