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1
2
29
30 package com.jcraft.jsch.jce;
31
32 import com.jcraft.jsch.Cipher;
33 import javax.crypto.spec.*;
34
35 public class AES256CBC implements Cipher{
36 private static final int ivsize=16;
37 private static final int bsize=32;
38 private javax.crypto.Cipher cipher;
39 public int getIVSize(){return ivsize;}
40 public int getBlockSize(){return bsize;}
41 public void init(int mode, byte[] key, byte[] iv) throws Exception  {
42 String pad="NoPadding";
43 byte[] tmp;
44 if(iv.length>ivsize){
45 tmp=new byte[ivsize];
46 System.arraycopy(iv, 0, tmp, 0, tmp.length);
47 iv=tmp;
48 }
49 if(key.length>bsize){
50 tmp=new byte[bsize];
51 System.arraycopy(key, 0, tmp, 0, tmp.length);
52 key=tmp;
53 }
54 try{
55 SecretKeySpec keyspec=new SecretKeySpec(key, "AES");
56 cipher=javax.crypto.Cipher.getInstance("AES/CBC/"+pad);
57 cipher.init((mode==ENCRYPT_MODE?
58 javax.crypto.Cipher.ENCRYPT_MODE:
59 javax.crypto.Cipher.DECRYPT_MODE),
60 keyspec, new IvParameterSpec(iv));
61 }
62 catch(Exception e){
63 System.err.println(e);
64 cipher=null;
65 }
66 }
67 public void update(byte[] foo, int s1, int len, byte[] bar, int s2) throws Exception {
68 cipher.update(foo, s1, len, bar, s2);
69 }
70 }
71 |
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