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annotate app/src/main/java/ch/ethz/ssh2/crypto/digest/MAC.java @ 518:9acc51a5a98f

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Added tag stable-1.9.4-6 for changeset 947ea334735d
author Carl Byington <carl@five-ten-sg.com>
date Fri, 31 May 2024 13:35:44 -0600
parents 7953570e5210
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",
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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-sha2-512")) return 64;
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40 if (type.equals("hmac-sha2-256")) return 32;
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41 if (type.equals("hmac-sha1")) return 20;
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42 if (type.equals("hmac-sha1-96")) return 20;
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43 if (type.equals("hmac-md5")) return 16;
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44 if (type.equals("hmac-md5-96")) return 16;
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45 throw new IllegalArgumentException(String.format("Unknown algorithm %s", type));
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46 }
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47
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48 public MAC(final String type, final byte[] key) throws DigestException {
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49 if (type.equals("hmac-sha2-512")) {
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50 mac = new HMAC(new SHA512(), key, 64, 128);
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51 }
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52 else if (type.equals("hmac-sha2-256")) {
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53 mac = new HMAC(new SHA256(), key, 32, 64);
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54 }
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55 else if (type.equals("hmac-sha1")) {
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56 mac = new HMAC(new SHA1(), key, 20, 64);
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57 }
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58 else if (type.equals("hmac-sha1-96")) {
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59 mac = new HMAC(new SHA1(), key, 12, 64);
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60 }
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61 else if (type.equals("hmac-md5")) {
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62 mac = new HMAC(new MD5(), key, 16, 64);
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63 }
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64 else if (type.equals("hmac-md5-96")) {
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65 mac = new HMAC(new MD5(), key, 12, 64);
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66 }
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67 else {
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68 throw new IllegalArgumentException(String.format("Unknown algorithm %s", type));
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69 }
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70
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71 size = mac.getDigestLength();
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72 }
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73
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74 public final void initMac(final int seq) {
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75 mac.reset();
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76 mac.update((byte)(seq >> 24));
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77 mac.update((byte)(seq >> 16));
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78 mac.update((byte)(seq >> 8));
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79 mac.update((byte)(seq));
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80 }
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81
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82 public final void update(byte[] packetdata, int off, int len) {
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83 mac.update(packetdata, off, len);
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84 }
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85
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86 public final void getMac(byte[] out, int off) throws IOException {
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87 try {
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88 mac.digest(out, off);
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89 }
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90 catch (DigestException e) {
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91 throw new IOException(e);
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92 }
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93 }
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94
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95 public final int size() {
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96 return size;
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97 }
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98 }