Mercurial > dropbear
annotate libtomcrypt/src/mac/pmac/pmac_init.c @ 1128:a9e074b78cd5
check ecc key return, fix null pointer crash
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 23 Jun 2015 21:48:13 +0800 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
rev | line source |
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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 * |
382
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9 * Tom St Denis, [email protected], http://libtomcrypt.com |
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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 LTC_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); |
382
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90 if ((err = cipher_descriptor[cipher].ecb_encrypt(L, L, &pmac->key)) != CRYPT_OK) { |
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91 goto error; |
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92 } |
285
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93 |
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94 /* find Ls[i] = L << i for i == 0..31 */ |
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95 XMEMCPY(pmac->Ls[0], L, pmac->block_len); |
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96 for (x = 1; x < 32; x++) { |
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97 m = pmac->Ls[x-1][0] >> 7; |
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98 for (y = 0; y < pmac->block_len-1; y++) { |
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99 pmac->Ls[x][y] = ((pmac->Ls[x-1][y] << 1) | (pmac->Ls[x-1][y+1] >> 7)) & 255; |
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100 } |
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101 pmac->Ls[x][pmac->block_len-1] = (pmac->Ls[x-1][pmac->block_len-1] << 1) & 255; |
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102 |
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103 if (m == 1) { |
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104 for (y = 0; y < pmac->block_len; y++) { |
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105 pmac->Ls[x][y] ^= polys[poly].poly_mul[y]; |
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106 } |
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107 } |
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108 } |
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109 |
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110 /* find Lr = L / x */ |
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111 m = L[pmac->block_len-1] & 1; |
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112 |
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113 /* shift right */ |
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114 for (x = pmac->block_len - 1; x > 0; x--) { |
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115 pmac->Lr[x] = ((L[x] >> 1) | (L[x-1] << 7)) & 255; |
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116 } |
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117 pmac->Lr[0] = L[0] >> 1; |
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118 |
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119 if (m == 1) { |
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120 for (x = 0; x < pmac->block_len; x++) { |
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121 pmac->Lr[x] ^= polys[poly].poly_div[x]; |
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122 } |
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123 } |
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124 |
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125 /* zero buffer, counters, etc... */ |
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126 pmac->block_index = 1; |
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127 pmac->cipher_idx = cipher; |
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128 pmac->buflen = 0; |
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129 zeromem(pmac->block, sizeof(pmac->block)); |
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130 zeromem(pmac->Li, sizeof(pmac->Li)); |
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131 zeromem(pmac->checksum, sizeof(pmac->checksum)); |
382
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132 err = CRYPT_OK; |
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133 error: |
285
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134 #ifdef LTC_CLEAN_STACK |
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135 zeromem(L, pmac->block_len); |
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136 #endif |
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137 |
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138 XFREE(L); |
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139 |
382
0cbe8f6dbf9e
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140 return err; |
285
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141 } |
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142 |
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143 #endif |
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144 |
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145 /* $Source: /cvs/libtom/libtomcrypt/src/mac/pmac/pmac_init.c,v $ */ |
382
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146 /* $Revision: 1.7 $ */ |
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147 /* $Date: 2006/11/03 00:39:49 $ */ |