HMACMD596.java

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00001 /* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
00002 /*
00003 Copyright (c) 2002-2011 ymnk, JCraft,Inc. All rights reserved.
00004 
00005 Redistribution and use in source and binary forms, with or without
00006 modification, are permitted provided that the following conditions are met:
00007 
00008   1. Redistributions of source code must retain the above copyright notice,
00009      this list of conditions and the following disclaimer.
00010 
00011   2. Redistributions in binary form must reproduce the above copyright 
00012      notice, this list of conditions and the following disclaimer in 
00013      the documentation and/or other materials provided with the distribution.
00014 
00015   3. The names of the authors may not be used to endorse or promote products
00016      derived from this software without specific prior written permission.
00017 
00018 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
00019 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
00020 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
00021 INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
00022 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
00023 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
00024 OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00025 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00026 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
00027 EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00028 */
00029 
00030 package com.jcraft.jsch.jce;
00031 
00032 import com.jcraft.jsch.MAC;
00033 import javax.crypto.*;
00034 import javax.crypto.spec.*;
00035 
00036 public class HMACMD596 implements MAC{
00037   private static final String name="hmac-md5-96";
00038   private static final int bsize=12;
00039   private Mac mac;
00040   public int getBlockSize(){return bsize;};
00041   public void init(byte[] key) throws Exception{
00042     if(key.length>16){
00043       byte[] tmp=new byte[16];
00044       System.arraycopy(key, 0, tmp, 0, 16);   
00045       key=tmp;
00046     }
00047     SecretKeySpec skey=new SecretKeySpec(key, "HmacMD5");
00048     mac=Mac.getInstance("HmacMD5");
00049     mac.init(skey);
00050   } 
00051   private final byte[] tmp=new byte[4];
00052   public void update(int i){
00053     tmp[0]=(byte)(i>>>24);
00054     tmp[1]=(byte)(i>>>16);
00055     tmp[2]=(byte)(i>>>8);
00056     tmp[3]=(byte)i;
00057     update(tmp, 0, 4);
00058   }
00059 
00060   public void update(byte foo[], int s, int l){
00061     mac.update(foo, s, l);      
00062   }
00063 
00064   private final byte[] _buf16=new byte[16];
00065   public void doFinal(byte[] buf, int offset){
00066     try{
00067       mac.doFinal(_buf16, 0);
00068     }
00069     catch(ShortBufferException e){
00070     }
00071     System.arraycopy(_buf16, 0, buf, offset, 12);
00072   }
00073 
00074   public String getName(){
00075     return name;
00076   }
00077 }

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