Mercurial > dropbear

annotate src/mac/pmac/pmac_init.c @ 192:9cc34777b479 libtomcrypt

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propagate from branch 'au.asn.ucc.matt.ltc-orig' (head 9ba8f01f44320e9cb9f19881105ae84f84a43ea9) to branch 'au.asn.ucc.matt.dropbear.ltc' (head dbf51c569bc34956ad948e4cc87a0eeb2170b768)
author Matt Johnston <matt@ucc.asn.au>
date Sun, 08 May 2005 06:36:47 +0000
parents 1c15b283127b
children 39d5d58461d6
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191
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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 #include "tomcrypt.h"
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12
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13 /**
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14 @file pmac_init.c
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15 PMAC implementation, initialize state, by Tom St Denis
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16 */
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17
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18 #ifdef PMAC
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19
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20 static const struct {
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21 int len;
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22 unsigned char poly_div[MAXBLOCKSIZE],
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23 poly_mul[MAXBLOCKSIZE];
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24 } polys[] = {
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25 {
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26 8,
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27 { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0D },
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28 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1B }
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29 }, {
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30 16,
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31 { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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32 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x43 },
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33 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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34 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x87 }
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35 }
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36 };
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37
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38 /**
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39 Initialize a PMAC state
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40 @param pmac The PMAC state to initialize
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41 @param cipher The index of the desired cipher
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42 @param key The secret key
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43 @param keylen The length of the secret key (octets)
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44 @return CRYPT_OK if successful
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45 */
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46 int pmac_init(pmac_state *pmac, int cipher, const unsigned char *key, unsigned long keylen)
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47 {
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48 int poly, x, y, m, err;
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49 unsigned char *L;
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50
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51 LTC_ARGCHK(pmac != NULL);
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52 LTC_ARGCHK(key != NULL);
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53
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54 /* valid cipher? */
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55 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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56 return err;
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57 }
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58
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59 /* determine which polys to use */
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60 pmac->block_len = cipher_descriptor[cipher].block_length;
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61 for (poly = 0; poly < (int)(sizeof(polys)/sizeof(polys[0])); poly++) {
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62 if (polys[poly].len == pmac->block_len) {
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63 break;
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64 }
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65 }
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66 if (polys[poly].len != pmac->block_len) {
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67 return CRYPT_INVALID_ARG;
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68 }
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69
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70 #ifdef LTC_FAST
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71 if (pmac->block_len % sizeof(LTC_FAST_TYPE)) {
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72 return CRYPT_INVALID_ARG;
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73 }
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74 #endif
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75
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76
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77 /* schedule the key */
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78 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &pmac->key)) != CRYPT_OK) {
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79 return err;
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80 }
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81
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82 /* allocate L */
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83 L = XMALLOC(pmac->block_len);
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84 if (L == NULL) {
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85 return CRYPT_MEM;
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86 }
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87
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88 /* find L = E[0] */
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89 zeromem(L, pmac->block_len);
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90 cipher_descriptor[cipher].ecb_encrypt(L, L, &pmac->key);
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91
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92 /* find Ls[i] = L << i for i == 0..31 */
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93 XMEMCPY(pmac->Ls[0], L, pmac->block_len);
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94 for (x = 1; x < 32; x++) {
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95 m = pmac->Ls[x-1][0] >> 7;
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96 for (y = 0; y < pmac->block_len-1; y++) {
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97 pmac->Ls[x][y] = ((pmac->Ls[x-1][y] << 1) | (pmac->Ls[x-1][y+1] >> 7)) & 255;
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98 }
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99 pmac->Ls[x][pmac->block_len-1] = (pmac->Ls[x-1][pmac->block_len-1] << 1) & 255;
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100
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101 if (m == 1) {
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102 for (y = 0; y < pmac->block_len; y++) {
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103 pmac->Ls[x][y] ^= polys[poly].poly_mul[y];
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104 }
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105 }
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106 }
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107
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108 /* find Lr = L / x */
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109 m = L[pmac->block_len-1] & 1;
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110
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111 /* shift right */
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112 for (x = pmac->block_len - 1; x > 0; x--) {
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113 pmac->Lr[x] = ((L[x] >> 1) | (L[x-1] << 7)) & 255;
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114 }
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115 pmac->Lr[0] = L[0] >> 1;
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116
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117 if (m == 1) {
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118 for (x = 0; x < pmac->block_len; x++) {
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119 pmac->Lr[x] ^= polys[poly].poly_div[x];
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120 }
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121 }
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122
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123 /* zero buffer, counters, etc... */
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124 pmac->block_index = 1;
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125 pmac->cipher_idx = cipher;
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126 pmac->buflen = 0;
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127 zeromem(pmac->block, sizeof(pmac->block));
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128 zeromem(pmac->Li, sizeof(pmac->Li));
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129 zeromem(pmac->checksum, sizeof(pmac->checksum));
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130
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131 #ifdef LTC_CLEAN_STACK
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132 zeromem(L, pmac->block_len);
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133 #endif
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134
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135 XFREE(L);
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136
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137 return CRYPT_OK;
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138 }
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139
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140 #endif