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comparison src/ch/ethz/ssh2/crypto/digest/HMAC.java @ 342:175c7d68f3c4

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merge ganymed into mainline
author Carl Byington <carl@five-ten-sg.com>
date Thu, 31 Jul 2014 16:33:38 -0700
parents 071eccdff8ea
children
comparison
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272:ce2f4e397703 342:175c7d68f3c4
1 /*
2 * Copyright (c) 2006-2011 Christian Plattner. All rights reserved.
3 * Please refer to the LICENSE.txt for licensing details.
4 */
5 package ch.ethz.ssh2.crypto.digest;
6
7 import java.security.DigestException;
8
9 /**
10 * HMAC.
11 *
12 * @author Christian Plattner
13 * @version 2.50, 03/15/10
14 */
15 public final class HMAC implements Digest {
16 Digest md;
17 byte[] k_xor_ipad;
18 byte[] k_xor_opad;
19
20 byte[] tmp;
21
22 int size;
23
24 public HMAC(Digest md, byte[] key, int size) throws DigestException {
25 this.md = md;
26 this.size = size;
27 tmp = new byte[md.getDigestLength()];
28 final int BLOCKSIZE = 64;
29 k_xor_ipad = new byte[BLOCKSIZE];
30 k_xor_opad = new byte[BLOCKSIZE];
31
32 if (key.length > BLOCKSIZE) {
33 md.reset();
34 md.update(key);
35 md.digest(tmp);
36 key = tmp;
37 }
38
39 System.arraycopy(key, 0, k_xor_ipad, 0, key.length);
40 System.arraycopy(key, 0, k_xor_opad, 0, key.length);
41
42 for (int i = 0; i < BLOCKSIZE; i++) {
43 k_xor_ipad[i] ^= 0x36;
44 k_xor_opad[i] ^= 0x5C;
45 }
46
47 md.update(k_xor_ipad);
48 }
49
50 public final int getDigestLength() {
51 return size;
52 }
53
54 public final void update(byte b) {
55 md.update(b);
56 }
57
58 public final void update(byte[] b) {
59 md.update(b);
60 }
61
62 public final void update(byte[] b, int off, int len) {
63 md.update(b, off, len);
64 }
65
66 public final void reset() {
67 md.reset();
68 md.update(k_xor_ipad);
69 }
70
71 public final void digest(byte[] out) throws DigestException {
72 digest(out, 0);
73 }
74
75 public final void digest(byte[] out, int off) throws DigestException {
76 md.digest(tmp);
77 md.update(k_xor_opad);
78 md.update(tmp);
79 md.digest(tmp);
80 System.arraycopy(tmp, 0, out, off, size);
81 md.update(k_xor_ipad);
82 }
83 }