Mercurial > dropbear
annotate libtomcrypt/src/mac/pmac/pmac_init.c @ 1866:adfcdfb161a4
Fix missing NULL terminator for re-exec
Also fixes fallback, sockets were not kept open
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 31 Jan 2022 11:12:58 +0800 |
parents | 6dba84798cd5 |
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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 #include "tomcrypt.h" |
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10 |
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11 /** |
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12 @file pmac_init.c |
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13 PMAC implementation, initialize state, by Tom St Denis |
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14 */ |
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15 |
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16 #ifdef LTC_PMAC |
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17 |
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18 static const struct { |
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19 int len; |
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20 unsigned char poly_div[MAXBLOCKSIZE], |
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21 poly_mul[MAXBLOCKSIZE]; |
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22 } polys[] = { |
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23 { |
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24 8, |
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25 { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0D }, |
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26 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1B } |
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27 }, { |
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28 16, |
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29 { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
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30 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x43 }, |
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31 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
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32 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x87 } |
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33 } |
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34 }; |
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35 |
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36 /** |
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37 Initialize a PMAC state |
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38 @param pmac The PMAC state to initialize |
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39 @param cipher The index of the desired cipher |
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40 @param key The secret key |
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41 @param keylen The length of the secret key (octets) |
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42 @return CRYPT_OK if successful |
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43 */ |
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44 int pmac_init(pmac_state *pmac, int cipher, const unsigned char *key, unsigned long keylen) |
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45 { |
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46 int poly, x, y, m, err; |
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47 unsigned char *L; |
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48 |
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49 LTC_ARGCHK(pmac != NULL); |
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50 LTC_ARGCHK(key != NULL); |
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51 |
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52 /* valid cipher? */ |
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53 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { |
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54 return err; |
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55 } |
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56 |
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57 /* determine which polys to use */ |
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58 pmac->block_len = cipher_descriptor[cipher].block_length; |
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59 for (poly = 0; poly < (int)(sizeof(polys)/sizeof(polys[0])); poly++) { |
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60 if (polys[poly].len == pmac->block_len) { |
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61 break; |
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62 } |
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63 } |
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64 if (poly >= (int)(sizeof(polys)/sizeof(polys[0]))) { |
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65 return CRYPT_INVALID_ARG; |
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66 } |
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67 if (polys[poly].len != pmac->block_len) { |
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68 return CRYPT_INVALID_ARG; |
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69 } |
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70 |
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71 #ifdef LTC_FAST |
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72 if (pmac->block_len % sizeof(LTC_FAST_TYPE)) { |
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73 return CRYPT_INVALID_ARG; |
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74 } |
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75 #endif |
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76 |
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77 |
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78 /* schedule the key */ |
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79 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &pmac->key)) != CRYPT_OK) { |
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80 return err; |
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81 } |
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82 |
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83 /* allocate L */ |
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84 L = XMALLOC(pmac->block_len); |
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85 if (L == NULL) { |
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86 return CRYPT_MEM; |
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87 } |
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88 |
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89 /* find L = E[0] */ |
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90 zeromem(L, pmac->block_len); |
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91 if ((err = cipher_descriptor[cipher].ecb_encrypt(L, L, &pmac->key)) != CRYPT_OK) { |
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92 goto error; |
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93 } |
285
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94 |
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95 /* find Ls[i] = L << i for i == 0..31 */ |
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96 XMEMCPY(pmac->Ls[0], L, pmac->block_len); |
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97 for (x = 1; x < 32; x++) { |
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98 m = pmac->Ls[x-1][0] >> 7; |
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99 for (y = 0; y < pmac->block_len-1; y++) { |
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100 pmac->Ls[x][y] = ((pmac->Ls[x-1][y] << 1) | (pmac->Ls[x-1][y+1] >> 7)) & 255; |
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101 } |
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102 pmac->Ls[x][pmac->block_len-1] = (pmac->Ls[x-1][pmac->block_len-1] << 1) & 255; |
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103 |
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104 if (m == 1) { |
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105 for (y = 0; y < pmac->block_len; y++) { |
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106 pmac->Ls[x][y] ^= polys[poly].poly_mul[y]; |
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107 } |
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108 } |
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109 } |
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110 |
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111 /* find Lr = L / x */ |
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112 m = L[pmac->block_len-1] & 1; |
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113 |
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114 /* shift right */ |
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115 for (x = pmac->block_len - 1; x > 0; x--) { |
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116 pmac->Lr[x] = ((L[x] >> 1) | (L[x-1] << 7)) & 255; |
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117 } |
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118 pmac->Lr[0] = L[0] >> 1; |
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119 |
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120 if (m == 1) { |
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121 for (x = 0; x < pmac->block_len; x++) { |
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122 pmac->Lr[x] ^= polys[poly].poly_div[x]; |
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123 } |
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124 } |
285
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125 |
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126 /* zero buffer, counters, etc... */ |
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127 pmac->block_index = 1; |
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128 pmac->cipher_idx = cipher; |
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129 pmac->buflen = 0; |
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130 zeromem(pmac->block, sizeof(pmac->block)); |
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131 zeromem(pmac->Li, sizeof(pmac->Li)); |
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132 zeromem(pmac->checksum, sizeof(pmac->checksum)); |
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133 err = CRYPT_OK; |
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134 error: |
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135 #ifdef LTC_CLEAN_STACK |
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136 zeromem(L, pmac->block_len); |
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137 #endif |
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138 |
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139 XFREE(L); |
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140 |
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141 return err; |
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142 } |
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143 |
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144 #endif |
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145 |
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146 /* ref: $Format:%D$ */ |
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147 /* git commit: $Format:%H$ */ |
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148 /* commit time: $Format:%ai$ */ |