74 lines
2.8 KiB
Java
74 lines
2.8 KiB
Java
/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
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/*
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Copyright (c) 2008-2015 ymnk, JCraft,Inc. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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3. The names of the authors may not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
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INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package com.jcraft.jsch.jce;
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import com.jcraft.jsch.Cipher;
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import javax.crypto.*;
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import javax.crypto.spec.*;
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public class ARCFOUR256 implements Cipher{
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private static final int ivsize=8;
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private static final int bsize=32;
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private static final int skip=1536;
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private javax.crypto.Cipher cipher;
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public int getIVSize(){return ivsize;}
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public int getBlockSize(){return bsize;}
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public void init(int mode, byte[] key, byte[] iv) throws Exception{
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byte[] tmp;
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if(key.length>bsize){
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tmp=new byte[bsize];
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System.arraycopy(key, 0, tmp, 0, tmp.length);
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key=tmp;
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}
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try{
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cipher=javax.crypto.Cipher.getInstance("RC4");
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SecretKeySpec _key = new SecretKeySpec(key, "RC4");
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synchronized(javax.crypto.Cipher.class){
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cipher.init((mode==ENCRYPT_MODE?
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javax.crypto.Cipher.ENCRYPT_MODE:
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javax.crypto.Cipher.DECRYPT_MODE),
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_key);
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}
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byte[] foo=new byte[1];
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for(int i=0; i<skip; i++){
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cipher.update(foo, 0, 1, foo, 0);
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}
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}
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catch(Exception e){
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cipher=null;
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throw e;
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}
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}
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public void update(byte[] foo, int s1, int len, byte[] bar, int s2) throws Exception{
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cipher.update(foo, s1, len, bar, s2);
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}
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public boolean isCBC(){return false; }
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}
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