/*
 * Copyright (c) 2006, The JAP-Team
 * 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 the University of Technology Dresden, Germany 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 anon.client.crypto;

import java.util.Vector;


/** 
 * @author Stefan Lieske
 */
public class MixCipherChain {

  private IMixCipher[] m_cipherChain;
  
  
  public MixCipherChain(IMixCipher[] a_cipherChain) {
    m_cipherChain = a_cipherChain;
  }

    
  public byte[] encryptPacket(byte[] a_plainPacket, int a_virtualPacketLength, Vector a_sendCallbackHandlers) {
    byte[] encryptedPacket = a_plainPacket;
    for (int i = (m_cipherChain.length - 1); i >= 0; i--) {
      encryptedPacket = m_cipherChain[i].encrypt(encryptedPacket, a_virtualPacketLength, a_sendCallbackHandlers);
    }
    return encryptedPacket;
  }
  
  public int getNextPacketEncryptionOverhead() {
    int overhead = 0;
    for (int i = (m_cipherChain.length - 1); i >= 0; i--) {
      overhead = overhead + m_cipherChain[i].getNextPacketEncryptionOverhead();
    }
    return overhead;
  }
  
  public void decryptPacket(byte[] m_packet) {
    for (int i = 0; i < m_cipherChain.length; i++) {
      m_cipherChain[i].decrypt(m_packet);
    }
  }
  
}
