BlowfishCBC.java

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/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
/*
Copyright (c) 2002-2011 ymnk, JCraft,Inc. All rights reserved.

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

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     the documentation and/or other materials provided with the distribution.

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     derived from this software without specific prior written permission.

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package com.jcraft.jsch.jce;

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

public class BlowfishCBC implements Cipher{
  private static final int ivsize=8;
  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";      
//  if(padding) pad="PKCS5Padding";
    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 skeySpec = new SecretKeySpec(key, "Blowfish");
      cipher=javax.crypto.Cipher.getInstance("Blowfish/CBC/"+pad);
      cipher.init((mode==ENCRYPT_MODE?
           javax.crypto.Cipher.ENCRYPT_MODE:
           javax.crypto.Cipher.DECRYPT_MODE),
          skeySpec, new IvParameterSpec(iv));
    }
    catch(Exception e){
      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; }
}