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.MAC;
33: import javax.crypto.*;
34: import javax.crypto.spec.*;
35:
36: public class HMACSHA1 implements MAC {
37: private static final String name = "hmac-sha1";
38: private static final int bsize = 20;
39: private Mac mac;
40:
41: public int getBlockSize() {
42: return bsize;
43: };
44:
45: public void init(byte[] key) throws Exception {
46: if (key.length > bsize) {
47: byte[] tmp = new byte[bsize];
48: System.arraycopy(key, 0, tmp, 0, bsize);
49: key = tmp;
50: }
51: SecretKeySpec skey = new SecretKeySpec(key, "HmacSHA1");
52: mac = Mac.getInstance("HmacSHA1");
53: mac.init(skey);
54: }
55:
56: private final byte[] tmp = new byte[4];
57:
58: public void update(int i) {
59: tmp[0] = (byte) (i >>> 24);
60: tmp[1] = (byte) (i >>> 16);
61: tmp[2] = (byte) (i >>> 8);
62: tmp[3] = (byte) i;
63: update(tmp, 0, 4);
64: }
65:
66: public void update(byte foo[], int s, int l) {
67: mac.update(foo, s, l);
68: }
69:
70: public void doFinal(byte[] buf, int offset) {
71: try {
72: mac.doFinal(buf, offset);
73: } catch (ShortBufferException e) {
74: }
75: }
76:
77: public String getName() {
78: return name;
79: }
80: }
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