AES128CBC.java

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/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
/*
Copyright (c) 2005-2011 ymnk, JCraft,Inc. All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

  1. Redistributions of source code must retain the above copyright notice,
     this list of conditions and the following disclaimer.

  2. 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.

  3. The names of the authors may not be used to endorse or promote products
     derived from this software without specific prior written permission.

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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
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package com.jcraft.jsch.jce;

import com.jcraft.jsch.Cipher;
import javax.crypto.spec.*;

public class AES128CBC implements Cipher{
  private static final int ivsize=16;
  private static final int bsize=16;
  private javax.crypto.Cipher cipher;    
  public int getIVSize(){return ivsize;} 
  public int getBlockSize(){return bsize;}
  public void init(int mode, byte[] key, byte[] iv) throws Exception{
    String pad="NoPadding";      
    byte[] tmp;
    if(iv.length>ivsize){
      tmp=new byte[ivsize];
      System.arraycopy(iv, 0, tmp, 0, tmp.length);
      iv=tmp;
    }
    if(key.length>bsize){
      tmp=new byte[bsize];
      System.arraycopy(key, 0, tmp, 0, tmp.length);
      key=tmp;
    }

    try{
      SecretKeySpec keyspec=new SecretKeySpec(key, "AES");
      cipher=javax.crypto.Cipher.getInstance("AES/CBC/"+pad);
      cipher.init((mode==ENCRYPT_MODE?
                   javax.crypto.Cipher.ENCRYPT_MODE:
                   javax.crypto.Cipher.DECRYPT_MODE),
                  keyspec, new IvParameterSpec(iv));
    }
    catch(Exception e){
      cipher=null;
      throw e;
    }
  }
  public void update(byte[] foo, int s1, int len, byte[] bar, int s2) throws Exception{
    cipher.update(foo, s1, len, bar, s2);
  }

  public boolean isCBC(){return true; }
}