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annotate src/ch/ethz/ssh2/crypto/digest/MAC.java @ 421:660ac2d2003b

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break out of infinite loop
author Carl Byington <carl@five-ten-sg.com>
date Wed, 29 Oct 2014 18:03:42 -0700
parents 4226f87534f4
children
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1 /*
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2 * Copyright (c) 2006-2011 Christian Plattner. All rights reserved.
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3 * Please refer to the LICENSE.txt for licensing details.
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4 */
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5 package ch.ethz.ssh2.crypto.digest;
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6
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7 import java.io.IOException;
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8 import java.security.DigestException;
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9
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10 /**
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11 * MAC.
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12 *
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13 * @author Christian Plattner
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14 * @version 2.50, 03/15/10
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15 */
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16 public final class MAC {
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17 private Digest mac;
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18 private int size;
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19
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20 public static String[] getMacList() {
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21 // Higher priority (stronger) first. Added SHA-2 algorithms as in RFC 6668
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22 return new String[] {
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23 // "hmac-sha2-512", // fails interop w/ centos6
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24 "hmac-sha2-256",
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25 "hmac-sha1",
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26 "hmac-sha1-96",
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27 "hmac-md5",
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28 "hmac-md5-96"
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29 };
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30 }
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31
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32 public static void checkMacList(final String[] macs) {
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33 for (String m : macs) {
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34 getKeyLen(m);
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35 }
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36 }
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37
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38 public static int getKeyLen(final String type) {
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39 if (type.equals("hmac-sha1")) {
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40 return 20;
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41 }
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42
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43 if (type.equals("hmac-sha1-96")) {
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44 return 20;
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45 }
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46
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47 if (type.equals("hmac-md5")) {
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48 return 16;
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49 }
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50
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51 if (type.equals("hmac-md5-96")) {
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52 return 16;
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53 }
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54
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55 if (type.equals("hmac-sha2-256")) {
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56 return 32;
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57 }
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58
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59 if (type.equals("hmac-sha2-512")) {
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60 return 64;
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61 }
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62
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63 throw new IllegalArgumentException(String.format("Unknown algorithm %s", type));
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64 }
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65
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66 public MAC(final String type, final byte[] key) throws DigestException {
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67 if (type.equals("hmac-sha1")) {
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68 mac = new HMAC(new SHA1(), key, 20);
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69 }
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70 else if (type.equals("hmac-sha1-96")) {
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71 mac = new HMAC(new SHA1(), key, 12);
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72 }
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73 else if (type.equals("hmac-md5")) {
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74 mac = new HMAC(new MD5(), key, 16);
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75 }
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76 else if (type.equals("hmac-md5-96")) {
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77 mac = new HMAC(new MD5(), key, 12);
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78 }
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79 else if (type.equals("hmac-sha2-256")) {
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80 mac = new HMAC(new SHA256(), key, 32);
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81 }
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82 else if (type.equals("hmac-sha2-512")) {
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83 mac = new HMAC(new SHA512(), key, 64);
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84 }
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85 else {
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86 throw new IllegalArgumentException(String.format("Unknown algorithm %s", type));
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87 }
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88
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89 size = mac.getDigestLength();
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90 }
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91
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92 public final void initMac(final int seq) {
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93 mac.reset();
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94 mac.update((byte)(seq >> 24));
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95 mac.update((byte)(seq >> 16));
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96 mac.update((byte)(seq >> 8));
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97 mac.update((byte)(seq));
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98 }
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99
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100 public final void update(byte[] packetdata, int off, int len) {
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101 mac.update(packetdata, off, len);
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102 }
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103
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104 public final void getMac(byte[] out, int off) throws IOException {
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105 try {
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106 mac.digest(out, off);
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107 }
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108 catch (DigestException e) {
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109 throw new IOException(e);
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110 }
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111 }
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112
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113 public final int size() {
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114 return size;
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115 }
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116 }