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comparison app/src/main/java/ch/ethz/ssh2/crypto/digest/MAC.java @ 438:d29cce60f393

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migrate from Eclipse to Android Studio
author Carl Byington <carl@five-ten-sg.com>
date Thu, 03 Dec 2015 11:23:55 -0800
parents src/ch/ethz/ssh2/crypto/digest/MAC.java@4226f87534f4
children 7953570e5210
comparison
equal deleted inserted replaced
437:208b31032318 438:d29cce60f393
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.io.IOException;
8 import java.security.DigestException;
9
10 /**
11 * MAC.
12 *
13 * @author Christian Plattner
14 * @version 2.50, 03/15/10
15 */
16 public final class MAC {
17 private Digest mac;
18 private int size;
19
20 public static String[] getMacList() {
21 // Higher priority (stronger) first. Added SHA-2 algorithms as in RFC 6668
22 return new String[] {
23 // "hmac-sha2-512", // fails interop w/ centos6
24 "hmac-sha2-256",
25 "hmac-sha1",
26 "hmac-sha1-96",
27 "hmac-md5",
28 "hmac-md5-96"
29 };
30 }
31
32 public static void checkMacList(final String[] macs) {
33 for (String m : macs) {
34 getKeyLen(m);
35 }
36 }
37
38 public static int getKeyLen(final String type) {
39 if (type.equals("hmac-sha1")) {
40 return 20;
41 }
42
43 if (type.equals("hmac-sha1-96")) {
44 return 20;
45 }
46
47 if (type.equals("hmac-md5")) {
48 return 16;
49 }
50
51 if (type.equals("hmac-md5-96")) {
52 return 16;
53 }
54
55 if (type.equals("hmac-sha2-256")) {
56 return 32;
57 }
58
59 if (type.equals("hmac-sha2-512")) {
60 return 64;
61 }
62
63 throw new IllegalArgumentException(String.format("Unknown algorithm %s", type));
64 }
65
66 public MAC(final String type, final byte[] key) throws DigestException {
67 if (type.equals("hmac-sha1")) {
68 mac = new HMAC(new SHA1(), key, 20);
69 }
70 else if (type.equals("hmac-sha1-96")) {
71 mac = new HMAC(new SHA1(), key, 12);
72 }
73 else if (type.equals("hmac-md5")) {
74 mac = new HMAC(new MD5(), key, 16);
75 }
76 else if (type.equals("hmac-md5-96")) {
77 mac = new HMAC(new MD5(), key, 12);
78 }
79 else if (type.equals("hmac-sha2-256")) {
80 mac = new HMAC(new SHA256(), key, 32);
81 }
82 else if (type.equals("hmac-sha2-512")) {
83 mac = new HMAC(new SHA512(), key, 64);
84 }
85 else {
86 throw new IllegalArgumentException(String.format("Unknown algorithm %s", type));
87 }
88
89 size = mac.getDigestLength();
90 }
91
92 public final void initMac(final int seq) {
93 mac.reset();
94 mac.update((byte)(seq >> 24));
95 mac.update((byte)(seq >> 16));
96 mac.update((byte)(seq >> 8));
97 mac.update((byte)(seq));
98 }
99
100 public final void update(byte[] packetdata, int off, int len) {
101 mac.update(packetdata, off, len);
102 }
103
104 public final void getMac(byte[] out, int off) throws IOException {
105 try {
106 mac.digest(out, off);
107 }
108 catch (DigestException e) {
109 throw new IOException(e);
110 }
111 }
112
113 public final int size() {
114 return size;
115 }
116 }