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annotate src/ch/ethz/ssh2/crypto/digest/HMAC.java @ 273:91a31873c42a ganymed

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start conversion from trilead to ganymed
author Carl Byington <carl@five-ten-sg.com>
date Fri, 18 Jul 2014 11:21:46 -0700
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children 071eccdff8ea
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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.security.DigestException;
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8
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9 /**
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10 * HMAC.
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11 *
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12 * @author Christian Plattner
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13 * @version 2.50, 03/15/10
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14 */
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15 public final class HMAC implements Digest
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16 {
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17 Digest md;
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18 byte[] k_xor_ipad;
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19 byte[] k_xor_opad;
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20
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21 byte[] tmp;
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22
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23 int size;
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24
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25 public HMAC(Digest md, byte[] key, int size) throws DigestException {
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26 this.md = md;
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27 this.size = size;
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28
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29 tmp = new byte[md.getDigestLength()];
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30
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31 final int BLOCKSIZE = 64;
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32
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33 k_xor_ipad = new byte[BLOCKSIZE];
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34 k_xor_opad = new byte[BLOCKSIZE];
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35
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36 if (key.length > BLOCKSIZE)
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37 {
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38 md.reset();
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39 md.update(key);
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40 md.digest(tmp);
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41 key = tmp;
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42 }
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43
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44 System.arraycopy(key, 0, k_xor_ipad, 0, key.length);
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45 System.arraycopy(key, 0, k_xor_opad, 0, key.length);
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46
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47 for (int i = 0; i < BLOCKSIZE; i++)
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48 {
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49 k_xor_ipad[i] ^= 0x36;
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50 k_xor_opad[i] ^= 0x5C;
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51 }
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52 md.update(k_xor_ipad);
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53 }
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54
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55 public final int getDigestLength()
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56 {
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57 return size;
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58 }
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59
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60 public final void update(byte b)
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61 {
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62 md.update(b);
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63 }
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64
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65 public final void update(byte[] b)
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66 {
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67 md.update(b);
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68 }
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69
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70 public final void update(byte[] b, int off, int len)
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71 {
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72 md.update(b, off, len);
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73 }
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74
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75 public final void reset()
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76 {
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77 md.reset();
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78 md.update(k_xor_ipad);
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79 }
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80
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81 public final void digest(byte[] out) throws DigestException {
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82 digest(out, 0);
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83 }
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84
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85 public final void digest(byte[] out, int off) throws DigestException {
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86 md.digest(tmp);
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87
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88 md.update(k_xor_opad);
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89 md.update(tmp);
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90
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91 md.digest(tmp);
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92
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93 System.arraycopy(tmp, 0, out, off, size);
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94
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95 md.update(k_xor_ipad);
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96 }
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97 }