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annotate pmac_init.c @ 211:f01f0400314d libtomcrypt

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disapproval of revision 6a39eb8b36778460fca83b8149df2a8b6d3327fd
author Matt Johnston <matt@ucc.asn.au>
date Wed, 06 Jul 2005 13:23:45 +0000
parents d7da3b1e1540
children 5d99163f7e32
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 *
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9 * Tom St Denis, [email protected], http://libtomcrypt.org
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10 */
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11
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12 /* PMAC implementation by Tom St Denis */
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13 #include "mycrypt.h"
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14
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15 #ifdef PMAC
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16
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17 static const struct {
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18 int len;
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19 unsigned char poly_div[MAXBLOCKSIZE],
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20 poly_mul[MAXBLOCKSIZE];
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21 } polys[] = {
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22 {
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23 8,
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24 { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0D },
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25 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1B }
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26 }, {
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27 16,
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28 { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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29 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x43 },
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30 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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31 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x87 }
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32 }
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33 };
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34
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35 int pmac_init(pmac_state *pmac, int cipher, const unsigned char *key, unsigned long keylen)
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36 {
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37 int poly, x, y, m, err;
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38 unsigned char L[MAXBLOCKSIZE];
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39
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40 _ARGCHK(pmac != NULL);
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41 _ARGCHK(key != NULL);
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42
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43 /* valid cipher? */
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44 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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45 return err;
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46 }
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47
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48 /* determine which polys to use */
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49 pmac->block_len = cipher_descriptor[cipher].block_length;
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50 for (poly = 0; poly < (int)(sizeof(polys)/sizeof(polys[0])); poly++) {
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51 if (polys[poly].len == pmac->block_len) {
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52 break;
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53 }
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54 }
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55 if (polys[poly].len != pmac->block_len) {
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56 return CRYPT_INVALID_ARG;
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57 }
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58
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59 /* schedule the key */
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60 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &pmac->key)) != CRYPT_OK) {
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61 return err;
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62 }
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63
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64 /* find L = E[0] */
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65 zeromem(L, pmac->block_len);
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66 cipher_descriptor[cipher].ecb_encrypt(L, L, &pmac->key);
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67
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68 /* find Ls[i] = L << i for i == 0..31 */
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69 memcpy(pmac->Ls[0], L, pmac->block_len);
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70 for (x = 1; x < 32; x++) {
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71 m = pmac->Ls[x-1][0] >> 7;
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72 for (y = 0; y < pmac->block_len-1; y++) {
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73 pmac->Ls[x][y] = ((pmac->Ls[x-1][y] << 1) | (pmac->Ls[x-1][y+1] >> 7)) & 255;
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74 }
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75 pmac->Ls[x][pmac->block_len-1] = (pmac->Ls[x-1][pmac->block_len-1] << 1) & 255;
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76
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77 if (m == 1) {
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78 for (y = 0; y < pmac->block_len; y++) {
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79 pmac->Ls[x][y] ^= polys[poly].poly_mul[y];
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80 }
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81 }
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82 }
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83
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84 /* find Lr = L / x */
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85 m = L[pmac->block_len-1] & 1;
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86
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87 /* shift right */
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88 for (x = pmac->block_len - 1; x > 0; x--) {
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89 pmac->Lr[x] = ((L[x] >> 1) | (L[x-1] << 7)) & 255;
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90 }
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91 pmac->Lr[0] = L[0] >> 1;
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92
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93 if (m == 1) {
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94 for (x = 0; x < pmac->block_len; x++) {
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95 pmac->Lr[x] ^= polys[poly].poly_div[x];
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96 }
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97 }
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98
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99 /* zero buffer, counters, etc... */
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100 pmac->block_index = 1;
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101 pmac->cipher_idx = cipher;
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102 pmac->buflen = 0;
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103 zeromem(pmac->block, sizeof(pmac->block));
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104 zeromem(pmac->Li, sizeof(pmac->Li));
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105 zeromem(pmac->checksum, sizeof(pmac->checksum));
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106
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107 #ifdef CLEAN_STACK
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108 zeromem(L, sizeof(L));
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109 #endif
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110
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111 return CRYPT_OK;
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112 }
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113
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114 #endif