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annotate src/ch/ethz/ssh2/crypto/digest/MAC.java @ 344:b40bc65fa09a

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compensate for SecureRandom bug on older devices
author Carl Byington <carl@five-ten-sg.com>
date Thu, 31 Jul 2014 18:39:36 -0700
parents 071eccdff8ea
children 8c1451f51a5e
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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 first. Added SHA-2 algorithms as in RFC 6668
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22 return new String[] {"hmac-sha1-96", "hmac-sha1", "hmac-md5-96", "hmac-md5", "hmac-sha2-256", "hmac-sha2-512"};
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23 }
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24
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25 public static void checkMacList(final String[] macs) {
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26 for (String m : macs) {
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27 getKeyLen(m);
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28 }
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29 }
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30
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31 public static int getKeyLen(final String type) {
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32 if (type.equals("hmac-sha1")) {
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33 return 20;
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34 }
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35
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36 if (type.equals("hmac-sha1-96")) {
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37 return 20;
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38 }
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39
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40 if (type.equals("hmac-md5")) {
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41 return 16;
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42 }
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43
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44 if (type.equals("hmac-md5-96")) {
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45 return 16;
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46 }
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47
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48 if (type.equals("hmac-sha2-256")) {
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49 return 32;
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50 }
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51
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52 if (type.equals("hmac-sha2-512")) {
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53 return 64;
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54 }
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55
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56 throw new IllegalArgumentException(String.format("Unknown algorithm %s", type));
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57 }
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58
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59 public MAC(final String type, final byte[] key) throws DigestException {
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60 if (type.equals("hmac-sha1")) {
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61 mac = new HMAC(new SHA1(), key, 20);
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62 }
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63 else if (type.equals("hmac-sha1-96")) {
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64 mac = new HMAC(new SHA1(), key, 12);
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65 }
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66 else if (type.equals("hmac-md5")) {
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67 mac = new HMAC(new MD5(), key, 16);
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68 }
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69 else if (type.equals("hmac-md5-96")) {
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70 mac = new HMAC(new MD5(), key, 12);
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71 }
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72 else if (type.equals("hmac-sha2-256")) {
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73 mac = new HMAC(new SHA256(), key, 32);
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74 }
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75 else if (type.equals("hmac-sha2-512")) {
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76 mac = new HMAC(new SHA512(), key, 64);
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77 }
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78 else {
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79 throw new IllegalArgumentException(String.format("Unknown algorithm %s", type));
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80 }
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81
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82 size = mac.getDigestLength();
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83 }
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84
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85 public final void initMac(final int seq) {
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86 mac.reset();
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87 mac.update((byte)(seq >> 24));
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88 mac.update((byte)(seq >> 16));
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89 mac.update((byte)(seq >> 8));
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90 mac.update((byte)(seq));
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91 }
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92
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93 public final void update(byte[] packetdata, int off, int len) {
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94 mac.update(packetdata, off, len);
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95 }
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96
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97 public final void getMac(byte[] out, int off) throws IOException {
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98 try {
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99 mac.digest(out, off);
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100 }
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101 catch (DigestException e) {
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102 throw new IOException(e);
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103 }
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104 }
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105
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106 public final int size() {
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107 return size;
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108 }
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109 }