Mercurial > dropbear
annotate libtomcrypt/src/prngs/fortuna.c @ 486:d59f628e7baa
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to branch 'au.asn.ucc.matt.dropbear' (head 636506b73e973b004cc058b07e6f36a25ff902f8)
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 17 Sep 2008 14:49:12 +0000 |
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children | f849a5ca2efc |
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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.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 fortuna.c |
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15 Fortuna PRNG, Tom St Denis |
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16 */ |
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17 |
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18 /* Implementation of Fortuna by Tom St Denis |
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19 |
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20 We deviate slightly here for reasons of simplicity [and to fit in the API]. First all "sources" |
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21 in the AddEntropy function are fixed to 0. Second since no reliable timer is provided |
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22 we reseed automatically when len(pool0) >= 64 or every FORTUNA_WD calls to the read function */ |
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23 |
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24 #ifdef FORTUNA |
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25 |
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26 /* requries SHA256 and AES */ |
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27 #if !(defined(RIJNDAEL) && defined(SHA256)) |
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28 #error FORTUNA requires SHA256 and RIJNDAEL (AES) |
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29 #endif |
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30 |
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31 #ifndef FORTUNA_POOLS |
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32 #warning FORTUNA_POOLS was not previously defined (old headers?) |
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33 #define FORTUNA_POOLS 32 |
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34 #endif |
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35 |
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36 #if FORTUNA_POOLS < 4 || FORTUNA_POOLS > 32 |
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37 #error FORTUNA_POOLS must be in [4..32] |
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38 #endif |
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39 |
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40 const struct ltc_prng_descriptor fortuna_desc = { |
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41 "fortuna", 1024, |
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42 &fortuna_start, |
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43 &fortuna_add_entropy, |
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44 &fortuna_ready, |
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45 &fortuna_read, |
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46 &fortuna_done, |
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47 &fortuna_export, |
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48 &fortuna_import, |
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49 &fortuna_test |
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50 }; |
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51 |
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52 /* update the IV */ |
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53 static void fortuna_update_iv(prng_state *prng) |
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54 { |
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55 int x; |
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56 unsigned char *IV; |
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57 /* update IV */ |
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58 IV = prng->fortuna.IV; |
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59 for (x = 0; x < 16; x++) { |
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60 IV[x] = (IV[x] + 1) & 255; |
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61 if (IV[x] != 0) break; |
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62 } |
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63 } |
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64 |
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65 /* reseed the PRNG */ |
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66 static int fortuna_reseed(prng_state *prng) |
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67 { |
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68 unsigned char tmp[MAXBLOCKSIZE]; |
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69 hash_state md; |
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70 int err, x; |
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71 |
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72 ++prng->fortuna.reset_cnt; |
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73 |
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74 /* new K == SHA256(K || s) where s == SHA256(P0) || SHA256(P1) ... */ |
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75 sha256_init(&md); |
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76 if ((err = sha256_process(&md, prng->fortuna.K, 32)) != CRYPT_OK) { |
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77 sha256_done(&md, tmp); |
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78 return err; |
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79 } |
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80 |
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81 for (x = 0; x < FORTUNA_POOLS; x++) { |
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82 if (x == 0 || ((prng->fortuna.reset_cnt >> (x-1)) & 1) == 0) { |
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83 /* terminate this hash */ |
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84 if ((err = sha256_done(&prng->fortuna.pool[x], tmp)) != CRYPT_OK) { |
382
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85 sha256_done(&md, tmp); |
285
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86 return err; |
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87 } |
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88 /* add it to the string */ |
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89 if ((err = sha256_process(&md, tmp, 32)) != CRYPT_OK) { |
382
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90 sha256_done(&md, tmp); |
285
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91 return err; |
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92 } |
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93 /* reset this pool */ |
382
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94 if ((err = sha256_init(&prng->fortuna.pool[x])) != CRYPT_OK) { |
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95 sha256_done(&md, tmp); |
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96 return err; |
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97 } |
285
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98 } else { |
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99 break; |
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100 } |
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101 } |
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102 |
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103 /* finish key */ |
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104 if ((err = sha256_done(&md, prng->fortuna.K)) != CRYPT_OK) { |
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105 return err; |
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106 } |
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107 if ((err = rijndael_setup(prng->fortuna.K, 32, 0, &prng->fortuna.skey)) != CRYPT_OK) { |
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108 return err; |
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109 } |
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110 fortuna_update_iv(prng); |
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111 |
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112 /* reset pool len */ |
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113 prng->fortuna.pool0_len = 0; |
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114 prng->fortuna.wd = 0; |
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115 |
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116 |
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117 #ifdef LTC_CLEAN_STACK |
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118 zeromem(&md, sizeof(md)); |
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119 zeromem(tmp, sizeof(tmp)); |
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120 #endif |
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121 |
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122 return CRYPT_OK; |
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123 } |
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124 |
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125 /** |
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126 Start the PRNG |
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127 @param prng [out] The PRNG state to initialize |
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128 @return CRYPT_OK if successful |
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129 */ |
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130 int fortuna_start(prng_state *prng) |
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131 { |
382
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132 int err, x, y; |
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133 unsigned char tmp[MAXBLOCKSIZE]; |
285
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134 |
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135 LTC_ARGCHK(prng != NULL); |
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136 |
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137 /* initialize the pools */ |
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138 for (x = 0; x < FORTUNA_POOLS; x++) { |
382
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139 if ((err = sha256_init(&prng->fortuna.pool[x])) != CRYPT_OK) { |
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140 for (y = 0; y < x; y++) { |
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141 sha256_done(&prng->fortuna.pool[y], tmp); |
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142 } |
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143 return err; |
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144 } |
285
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145 } |
382
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146 prng->fortuna.pool_idx = prng->fortuna.pool0_len = prng->fortuna.wd = 0; |
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147 prng->fortuna.reset_cnt = 0; |
285
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148 |
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149 /* reset bufs */ |
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150 zeromem(prng->fortuna.K, 32); |
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151 if ((err = rijndael_setup(prng->fortuna.K, 32, 0, &prng->fortuna.skey)) != CRYPT_OK) { |
382
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152 for (x = 0; x < FORTUNA_POOLS; x++) { |
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153 sha256_done(&prng->fortuna.pool[x], tmp); |
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154 } |
285
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155 return err; |
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156 } |
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157 zeromem(prng->fortuna.IV, 16); |
382
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158 |
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159 LTC_MUTEX_INIT(&prng->fortuna.prng_lock) |
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160 |
285
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161 return CRYPT_OK; |
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162 } |
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163 |
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164 /** |
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165 Add entropy to the PRNG state |
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166 @param in The data to add |
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167 @param inlen Length of the data to add |
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168 @param prng PRNG state to update |
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169 @return CRYPT_OK if successful |
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170 */ |
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171 int fortuna_add_entropy(const unsigned char *in, unsigned long inlen, prng_state *prng) |
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172 { |
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173 unsigned char tmp[2]; |
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174 int err; |
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175 |
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176 LTC_ARGCHK(in != NULL); |
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177 LTC_ARGCHK(prng != NULL); |
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178 |
382
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179 LTC_MUTEX_LOCK(&prng->fortuna.prng_lock); |
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180 |
285
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181 /* ensure inlen <= 32 */ |
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182 if (inlen > 32) { |
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183 LTC_MUTEX_UNLOCK(&prng->fortuna.prng_lock); |
285
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184 return CRYPT_INVALID_ARG; |
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185 } |
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186 |
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187 /* add s || length(in) || in to pool[pool_idx] */ |
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188 tmp[0] = 0; |
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189 tmp[1] = (unsigned char)inlen; |
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190 if ((err = sha256_process(&prng->fortuna.pool[prng->fortuna.pool_idx], tmp, 2)) != CRYPT_OK) { |
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191 LTC_MUTEX_UNLOCK(&prng->fortuna.prng_lock); |
285
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192 return err; |
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193 } |
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194 if ((err = sha256_process(&prng->fortuna.pool[prng->fortuna.pool_idx], in, inlen)) != CRYPT_OK) { |
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195 LTC_MUTEX_UNLOCK(&prng->fortuna.prng_lock); |
285
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196 return err; |
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197 } |
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198 if (prng->fortuna.pool_idx == 0) { |
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199 prng->fortuna.pool0_len += inlen; |
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200 } |
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201 if (++(prng->fortuna.pool_idx) == FORTUNA_POOLS) { |
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202 prng->fortuna.pool_idx = 0; |
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203 } |
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204 |
382
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205 LTC_MUTEX_UNLOCK(&prng->fortuna.prng_lock); |
285
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206 return CRYPT_OK; |
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207 } |
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208 |
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209 /** |
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210 Make the PRNG ready to read from |
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211 @param prng The PRNG to make active |
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212 @return CRYPT_OK if successful |
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213 */ |
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214 int fortuna_ready(prng_state *prng) |
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215 { |
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216 return fortuna_reseed(prng); |
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217 } |
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218 |
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219 /** |
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220 Read from the PRNG |
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221 @param out Destination |
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222 @param outlen Length of output |
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223 @param prng The active PRNG to read from |
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224 @return Number of octets read |
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225 */ |
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226 unsigned long fortuna_read(unsigned char *out, unsigned long outlen, prng_state *prng) |
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227 { |
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228 unsigned char tmp[16]; |
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229 int err; |
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230 unsigned long tlen; |
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231 |
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232 LTC_ARGCHK(out != NULL); |
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233 LTC_ARGCHK(prng != NULL); |
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234 |
382
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235 LTC_MUTEX_LOCK(&prng->fortuna.prng_lock); |
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236 |
285
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237 /* do we have to reseed? */ |
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238 if (++prng->fortuna.wd == FORTUNA_WD || prng->fortuna.pool0_len >= 64) { |
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239 if ((err = fortuna_reseed(prng)) != CRYPT_OK) { |
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240 LTC_MUTEX_UNLOCK(&prng->fortuna.prng_lock); |
285
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241 return 0; |
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242 } |
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243 } |
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244 |
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245 /* now generate the blocks required */ |
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246 tlen = outlen; |
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247 |
382
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248 /* handle whole blocks without the extra XMEMCPY */ |
285
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249 while (outlen >= 16) { |
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250 /* encrypt the IV and store it */ |
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251 rijndael_ecb_encrypt(prng->fortuna.IV, out, &prng->fortuna.skey); |
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252 out += 16; |
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253 outlen -= 16; |
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254 fortuna_update_iv(prng); |
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255 } |
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256 |
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257 /* left over bytes? */ |
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258 if (outlen > 0) { |
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259 rijndael_ecb_encrypt(prng->fortuna.IV, tmp, &prng->fortuna.skey); |
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260 XMEMCPY(out, tmp, outlen); |
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261 fortuna_update_iv(prng); |
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262 } |
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263 |
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264 /* generate new key */ |
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265 rijndael_ecb_encrypt(prng->fortuna.IV, prng->fortuna.K , &prng->fortuna.skey); fortuna_update_iv(prng); |
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266 rijndael_ecb_encrypt(prng->fortuna.IV, prng->fortuna.K+16, &prng->fortuna.skey); fortuna_update_iv(prng); |
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267 if ((err = rijndael_setup(prng->fortuna.K, 32, 0, &prng->fortuna.skey)) != CRYPT_OK) { |
382
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268 LTC_MUTEX_UNLOCK(&prng->fortuna.prng_lock); |
285
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269 return 0; |
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270 } |
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271 |
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272 #ifdef LTC_CLEAN_STACK |
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273 zeromem(tmp, sizeof(tmp)); |
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274 #endif |
382
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275 LTC_MUTEX_UNLOCK(&prng->fortuna.prng_lock); |
285
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276 return tlen; |
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277 } |
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278 |
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279 /** |
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280 Terminate the PRNG |
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281 @param prng The PRNG to terminate |
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282 @return CRYPT_OK if successful |
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283 */ |
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284 int fortuna_done(prng_state *prng) |
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285 { |
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286 int err, x; |
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287 unsigned char tmp[32]; |
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288 |
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289 LTC_ARGCHK(prng != NULL); |
382
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290 LTC_MUTEX_LOCK(&prng->fortuna.prng_lock); |
285
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291 |
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292 /* terminate all the hashes */ |
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293 for (x = 0; x < FORTUNA_POOLS; x++) { |
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294 if ((err = sha256_done(&(prng->fortuna.pool[x]), tmp)) != CRYPT_OK) { |
382
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295 LTC_MUTEX_UNLOCK(&prng->fortuna.prng_lock); |
285
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296 return err; |
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297 } |
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298 } |
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299 /* call cipher done when we invent one ;-) */ |
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300 |
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301 #ifdef LTC_CLEAN_STACK |
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302 zeromem(tmp, sizeof(tmp)); |
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303 #endif |
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304 |
382
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305 LTC_MUTEX_UNLOCK(&prng->fortuna.prng_lock); |
285
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306 return CRYPT_OK; |
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307 } |
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308 |
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309 /** |
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310 Export the PRNG state |
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311 @param out [out] Destination |
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312 @param outlen [in/out] Max size and resulting size of the state |
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313 @param prng The PRNG to export |
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314 @return CRYPT_OK if successful |
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315 */ |
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316 int fortuna_export(unsigned char *out, unsigned long *outlen, prng_state *prng) |
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317 { |
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318 int x, err; |
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319 hash_state *md; |
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320 |
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321 LTC_ARGCHK(out != NULL); |
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|
322 LTC_ARGCHK(outlen != NULL); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
323 LTC_ARGCHK(prng != NULL); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
324 |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
285
diff
changeset
|
325 LTC_MUTEX_LOCK(&prng->fortuna.prng_lock); |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
285
diff
changeset
|
326 |
285
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
327 /* we'll write bytes for s&g's */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
328 if (*outlen < 32*FORTUNA_POOLS) { |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
285
diff
changeset
|
329 LTC_MUTEX_UNLOCK(&prng->fortuna.prng_lock); |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
285
diff
changeset
|
330 *outlen = 32*FORTUNA_POOLS; |
285
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
331 return CRYPT_BUFFER_OVERFLOW; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
332 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
333 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
334 md = XMALLOC(sizeof(hash_state)); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
335 if (md == NULL) { |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
285
diff
changeset
|
336 LTC_MUTEX_UNLOCK(&prng->fortuna.prng_lock); |
285
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
337 return CRYPT_MEM; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
338 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
339 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
340 /* to emit the state we copy each pool, terminate it then hash it again so |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
341 * an attacker who sees the state can't determine the current state of the PRNG |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
342 */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
343 for (x = 0; x < FORTUNA_POOLS; x++) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
344 /* copy the PRNG */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
345 XMEMCPY(md, &(prng->fortuna.pool[x]), sizeof(*md)); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
346 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
347 /* terminate it */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
348 if ((err = sha256_done(md, out+x*32)) != CRYPT_OK) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
349 goto LBL_ERR; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
350 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
351 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
352 /* now hash it */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
353 if ((err = sha256_init(md)) != CRYPT_OK) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
354 goto LBL_ERR; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
355 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
356 if ((err = sha256_process(md, out+x*32, 32)) != CRYPT_OK) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
357 goto LBL_ERR; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
358 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
359 if ((err = sha256_done(md, out+x*32)) != CRYPT_OK) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
360 goto LBL_ERR; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
361 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
362 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
363 *outlen = 32*FORTUNA_POOLS; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
364 err = CRYPT_OK; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
365 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
366 LBL_ERR: |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
367 #ifdef LTC_CLEAN_STACK |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
368 zeromem(md, sizeof(*md)); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
369 #endif |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
370 XFREE(md); |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
285
diff
changeset
|
371 LTC_MUTEX_UNLOCK(&prng->fortuna.prng_lock); |
285
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
372 return err; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
373 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
374 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
375 /** |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
376 Import a PRNG state |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
377 @param in The PRNG state |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
378 @param inlen Size of the state |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
379 @param prng The PRNG to import |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
380 @return CRYPT_OK if successful |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
381 */ |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
382 int fortuna_import(const unsigned char *in, unsigned long inlen, prng_state *prng) |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
383 { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
384 int err, x; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
385 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
386 LTC_ARGCHK(in != NULL); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
387 LTC_ARGCHK(prng != NULL); |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
388 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
389 if (inlen != 32*FORTUNA_POOLS) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
390 return CRYPT_INVALID_ARG; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
391 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
392 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
393 if ((err = fortuna_start(prng)) != CRYPT_OK) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
394 return err; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
395 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
396 for (x = 0; x < FORTUNA_POOLS; x++) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
397 if ((err = fortuna_add_entropy(in+x*32, 32, prng)) != CRYPT_OK) { |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
398 return err; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
399 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
400 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
401 return err; |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
402 } |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
403 |
1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
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404 /** |
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405 PRNG self-test |
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406 @return CRYPT_OK if successful, CRYPT_NOP if self-testing has been disabled |
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407 */ |
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408 int fortuna_test(void) |
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409 { |
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410 #ifndef LTC_TEST |
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411 return CRYPT_NOP; |
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412 #else |
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413 int err; |
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414 |
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415 if ((err = sha256_test()) != CRYPT_OK) { |
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416 return err; |
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417 } |
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418 return rijndael_test(); |
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419 #endif |
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420 } |
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421 |
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422 #endif |
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423 |
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424 |
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425 /* $Source: /cvs/libtom/libtomcrypt/src/prngs/fortuna.c,v $ */ |
382
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426 /* $Revision: 1.12 $ */ |
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427 /* $Date: 2006/12/04 21:34:03 $ */ |