01: /* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
02: /*
03: Copyright (c) 2002-2008 ymnk, JCraft,Inc. All rights reserved.
04:
05: Redistribution and use in source and binary forms, with or without
06: modification, are permitted provided that the following conditions are met:
07:
08: 1. Redistributions of source code must retain the above copyright notice,
09: this list of conditions and the following disclaimer.
10:
11: 2. Redistributions in binary form must reproduce the above copyright
12: notice, this list of conditions and the following disclaimer in
13: the documentation and/or other materials provided with the distribution.
14:
15: 3. The names of the authors may not be used to endorse or promote products
16: derived from this software without specific prior written permission.
17:
18: THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
19: INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20: FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
21: INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
22: INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23: LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
24: OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
25: LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
26: NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
27: EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28: */
29:
30: package com.jcraft.jsch.jce;
31:
32: import com.jcraft.jsch.Cipher;
33: import javax.crypto.*;
34: import javax.crypto.spec.*;
35:
36: public class TripleDESCBC implements Cipher {
37: private static final int ivsize = 8;
38: private static final int bsize = 24;
39: private javax.crypto.Cipher cipher;
40:
41: public int getIVSize() {
42: return ivsize;
43: }
44:
45: public int getBlockSize() {
46: return bsize;
47: }
48:
49: public void init(int mode, byte[] key, byte[] iv) throws Exception {
50: String pad = "NoPadding";
51: //if(padding) pad="PKCS5Padding";
52: byte[] tmp;
53: if (iv.length > ivsize) {
54: tmp = new byte[ivsize];
55: System.arraycopy(iv, 0, tmp, 0, tmp.length);
56: iv = tmp;
57: }
58: if (key.length > bsize) {
59: tmp = new byte[bsize];
60: System.arraycopy(key, 0, tmp, 0, tmp.length);
61: key = tmp;
62: }
63:
64: try {
65: cipher = javax.crypto.Cipher.getInstance("DESede/CBC/"
66: + pad);
67: /*
68: // The following code does not work on IBM's JDK 1.4.1
69: SecretKeySpec skeySpec = new SecretKeySpec(key, "DESede");
70: cipher.init((mode==ENCRYPT_MODE?
71: javax.crypto.Cipher.ENCRYPT_MODE:
72: javax.crypto.Cipher.DECRYPT_MODE),
73: skeySpec, new IvParameterSpec(iv));
74: */
75: DESedeKeySpec keyspec = new DESedeKeySpec(key);
76: SecretKeyFactory keyfactory = SecretKeyFactory
77: .getInstance("DESede");
78: SecretKey _key = keyfactory.generateSecret(keyspec);
79: cipher
80: .init(
81: (mode == ENCRYPT_MODE ? javax.crypto.Cipher.ENCRYPT_MODE
82: : javax.crypto.Cipher.DECRYPT_MODE),
83: _key, new IvParameterSpec(iv));
84: } catch (Exception e) {
85: cipher = null;
86: throw e;
87: }
88: }
89:
90: public void update(byte[] foo, int s1, int len, byte[] bar, int s2)
91: throws Exception {
92: cipher.update(foo, s1, len, bar, s2);
93: }
94: }
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