Mercurial > dropbear
annotate libtomcrypt/src/prngs/yarrow.c @ 382:0cbe8f6dbf9e
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to branch 'au.asn.ucc.matt.dropbear' (head 02c413252c90e9de8e03d91e9939dde3029f5c0a)
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 11 Jan 2007 02:41:05 +0000 |
parents | 1b9e69c058d2 |
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 * |
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 yarrow.c |
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15 Yarrow PRNG, Tom St Denis |
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16 */ |
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17 |
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18 #ifdef YARROW |
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19 |
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20 const struct ltc_prng_descriptor yarrow_desc = |
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21 { |
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22 "yarrow", 64, |
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23 &yarrow_start, |
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24 &yarrow_add_entropy, |
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25 &yarrow_ready, |
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26 &yarrow_read, |
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27 &yarrow_done, |
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28 &yarrow_export, |
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29 &yarrow_import, |
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30 &yarrow_test |
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31 }; |
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32 |
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33 /** |
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34 Start the PRNG |
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35 @param prng [out] The PRNG state to initialize |
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36 @return CRYPT_OK if successful |
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37 */ |
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38 int yarrow_start(prng_state *prng) |
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39 { |
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40 int err; |
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41 |
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42 LTC_ARGCHK(prng != NULL); |
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43 |
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44 /* these are the default hash/cipher combo used */ |
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45 #ifdef RIJNDAEL |
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46 #if YARROW_AES==0 |
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47 prng->yarrow.cipher = register_cipher(&rijndael_enc_desc); |
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48 #elif YARROW_AES==1 |
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49 prng->yarrow.cipher = register_cipher(&aes_enc_desc); |
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50 #elif YARROW_AES==2 |
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51 prng->yarrow.cipher = register_cipher(&rijndael_desc); |
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52 #elif YARROW_AES==3 |
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53 prng->yarrow.cipher = register_cipher(&aes_desc); |
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54 #endif |
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55 #elif defined(BLOWFISH) |
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56 prng->yarrow.cipher = register_cipher(&blowfish_desc); |
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57 #elif defined(TWOFISH) |
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58 prng->yarrow.cipher = register_cipher(&twofish_desc); |
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59 #elif defined(RC6) |
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60 prng->yarrow.cipher = register_cipher(&rc6_desc); |
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61 #elif defined(RC5) |
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62 prng->yarrow.cipher = register_cipher(&rc5_desc); |
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63 #elif defined(SAFERP) |
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64 prng->yarrow.cipher = register_cipher(&saferp_desc); |
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65 #elif defined(RC2) |
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66 prng->yarrow.cipher = register_cipher(&rc2_desc); |
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67 #elif defined(NOEKEON) |
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68 prng->yarrow.cipher = register_cipher(&noekeon_desc); |
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69 #elif defined(ANUBIS) |
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70 prng->yarrow.cipher = register_cipher(&anubis_desc); |
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71 #elif defined(KSEED) |
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72 prng->yarrow.cipher = register_cipher(&kseed_desc); |
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73 #elif defined(KHAZAD) |
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74 prng->yarrow.cipher = register_cipher(&khazad_desc); |
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75 #elif defined(CAST5) |
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76 prng->yarrow.cipher = register_cipher(&cast5_desc); |
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77 #elif defined(XTEA) |
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78 prng->yarrow.cipher = register_cipher(&xtea_desc); |
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79 #elif defined(SAFER) |
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80 prng->yarrow.cipher = register_cipher(&safer_sk128_desc); |
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81 #elif defined(DES) |
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82 prng->yarrow.cipher = register_cipher(&des3_desc); |
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83 #else |
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84 #error YARROW needs at least one CIPHER |
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85 #endif |
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86 if ((err = cipher_is_valid(prng->yarrow.cipher)) != CRYPT_OK) { |
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87 return err; |
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88 } |
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89 |
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90 #ifdef SHA256 |
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91 prng->yarrow.hash = register_hash(&sha256_desc); |
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92 #elif defined(SHA512) |
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93 prng->yarrow.hash = register_hash(&sha512_desc); |
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94 #elif defined(TIGER) |
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95 prng->yarrow.hash = register_hash(&tiger_desc); |
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96 #elif defined(SHA1) |
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97 prng->yarrow.hash = register_hash(&sha1_desc); |
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98 #elif defined(RIPEMD320) |
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99 prng->yarrow.hash = register_hash(&rmd320_desc); |
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100 #elif defined(RIPEMD256) |
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101 prng->yarrow.hash = register_hash(&rmd256_desc); |
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102 #elif defined(RIPEMD160) |
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103 prng->yarrow.hash = register_hash(&rmd160_desc); |
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104 #elif defined(RIPEMD128) |
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105 prng->yarrow.hash = register_hash(&rmd128_desc); |
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106 #elif defined(MD5) |
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107 prng->yarrow.hash = register_hash(&md5_desc); |
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108 #elif defined(MD4) |
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109 prng->yarrow.hash = register_hash(&md4_desc); |
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110 #elif defined(MD2) |
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111 prng->yarrow.hash = register_hash(&md2_desc); |
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112 #elif defined(WHIRLPOOL) |
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113 prng->yarrow.hash = register_hash(&whirlpool_desc); |
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114 #else |
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115 #error YARROW needs at least one HASH |
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116 #endif |
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117 if ((err = hash_is_valid(prng->yarrow.hash)) != CRYPT_OK) { |
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118 return err; |
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119 } |
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120 |
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121 /* zero the memory used */ |
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122 zeromem(prng->yarrow.pool, sizeof(prng->yarrow.pool)); |
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123 LTC_MUTEX_INIT(&prng->yarrow.prng_lock) |
285
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124 |
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125 return CRYPT_OK; |
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126 } |
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127 |
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128 /** |
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129 Add entropy to the PRNG state |
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130 @param in The data to add |
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131 @param inlen Length of the data to add |
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132 @param prng PRNG state to update |
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133 @return CRYPT_OK if successful |
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134 */ |
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135 int yarrow_add_entropy(const unsigned char *in, unsigned long inlen, prng_state *prng) |
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136 { |
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137 hash_state md; |
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138 int err; |
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139 |
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140 LTC_ARGCHK(in != NULL); |
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141 LTC_ARGCHK(prng != NULL); |
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142 |
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143 LTC_MUTEX_LOCK(&prng->yarrow.prng_lock); |
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144 |
285
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145 if ((err = hash_is_valid(prng->yarrow.hash)) != CRYPT_OK) { |
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146 LTC_MUTEX_UNLOCK(&prng->yarrow.prng_lock); |
285
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147 return err; |
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148 } |
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149 |
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150 /* start the hash */ |
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151 if ((err = hash_descriptor[prng->yarrow.hash].init(&md)) != CRYPT_OK) { |
382
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152 LTC_MUTEX_UNLOCK(&prng->yarrow.prng_lock); |
285
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153 return err; |
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154 } |
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155 |
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156 /* hash the current pool */ |
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157 if ((err = hash_descriptor[prng->yarrow.hash].process(&md, prng->yarrow.pool, |
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158 hash_descriptor[prng->yarrow.hash].hashsize)) != CRYPT_OK) { |
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159 LTC_MUTEX_UNLOCK(&prng->yarrow.prng_lock); |
285
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160 return err; |
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161 } |
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162 |
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163 /* add the new entropy */ |
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164 if ((err = hash_descriptor[prng->yarrow.hash].process(&md, in, inlen)) != CRYPT_OK) { |
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165 LTC_MUTEX_UNLOCK(&prng->yarrow.prng_lock); |
285
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166 return err; |
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167 } |
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168 |
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169 /* store result */ |
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170 if ((err = hash_descriptor[prng->yarrow.hash].done(&md, prng->yarrow.pool)) != CRYPT_OK) { |
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171 LTC_MUTEX_UNLOCK(&prng->yarrow.prng_lock); |
285
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172 return err; |
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173 } |
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174 |
382
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175 LTC_MUTEX_UNLOCK(&prng->yarrow.prng_lock); |
285
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176 return CRYPT_OK; |
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177 } |
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178 |
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179 /** |
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180 Make the PRNG ready to read from |
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181 @param prng The PRNG to make active |
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182 @return CRYPT_OK if successful |
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183 */ |
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184 int yarrow_ready(prng_state *prng) |
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185 { |
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186 int ks, err; |
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187 |
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188 LTC_ARGCHK(prng != NULL); |
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189 LTC_MUTEX_LOCK(&prng->yarrow.prng_lock); |
285
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190 |
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191 if ((err = hash_is_valid(prng->yarrow.hash)) != CRYPT_OK) { |
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192 LTC_MUTEX_UNLOCK(&prng->yarrow.prng_lock); |
285
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193 return err; |
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194 } |
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195 |
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196 if ((err = cipher_is_valid(prng->yarrow.cipher)) != CRYPT_OK) { |
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197 LTC_MUTEX_UNLOCK(&prng->yarrow.prng_lock); |
285
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198 return err; |
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199 } |
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200 |
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201 /* setup CTR mode using the "pool" as the key */ |
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202 ks = (int)hash_descriptor[prng->yarrow.hash].hashsize; |
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203 if ((err = cipher_descriptor[prng->yarrow.cipher].keysize(&ks)) != CRYPT_OK) { |
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204 LTC_MUTEX_UNLOCK(&prng->yarrow.prng_lock); |
285
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205 return err; |
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206 } |
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207 |
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208 if ((err = ctr_start(prng->yarrow.cipher, /* what cipher to use */ |
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209 prng->yarrow.pool, /* IV */ |
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210 prng->yarrow.pool, ks, /* KEY and key size */ |
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211 0, /* number of rounds */ |
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212 CTR_COUNTER_LITTLE_ENDIAN, /* little endian counter */ |
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213 &prng->yarrow.ctr)) != CRYPT_OK) { |
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214 LTC_MUTEX_UNLOCK(&prng->yarrow.prng_lock); |
285
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215 return err; |
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216 } |
382
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217 LTC_MUTEX_UNLOCK(&prng->yarrow.prng_lock); |
285
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218 return CRYPT_OK; |
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219 } |
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220 |
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221 /** |
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222 Read from the PRNG |
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223 @param out Destination |
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224 @param outlen Length of output |
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225 @param prng The active PRNG to read from |
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226 @return Number of octets read |
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227 */ |
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228 unsigned long yarrow_read(unsigned char *out, unsigned long outlen, prng_state *prng) |
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229 { |
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230 LTC_ARGCHK(out != NULL); |
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231 LTC_ARGCHK(prng != NULL); |
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232 |
382
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233 LTC_MUTEX_LOCK(&prng->yarrow.prng_lock); |
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234 |
285
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235 /* put out in predictable state first */ |
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236 zeromem(out, outlen); |
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237 |
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238 /* now randomize it */ |
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239 if (ctr_encrypt(out, out, outlen, &prng->yarrow.ctr) != CRYPT_OK) { |
382
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240 LTC_MUTEX_UNLOCK(&prng->yarrow.prng_lock); |
285
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241 return 0; |
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242 } |
382
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243 LTC_MUTEX_UNLOCK(&prng->yarrow.prng_lock); |
285
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244 return outlen; |
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245 } |
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246 |
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247 /** |
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248 Terminate the PRNG |
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249 @param prng The PRNG to terminate |
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250 @return CRYPT_OK if successful |
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251 */ |
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252 int yarrow_done(prng_state *prng) |
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253 { |
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254 int err; |
285
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255 LTC_ARGCHK(prng != NULL); |
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256 |
382
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257 LTC_MUTEX_LOCK(&prng->yarrow.prng_lock); |
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258 |
285
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259 /* call cipher done when we invent one ;-) */ |
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260 |
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261 /* we invented one */ |
382
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262 err = ctr_done(&prng->yarrow.ctr); |
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263 |
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264 LTC_MUTEX_UNLOCK(&prng->yarrow.prng_lock); |
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265 return err; |
285
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266 } |
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267 |
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268 /** |
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269 Export the PRNG state |
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270 @param out [out] Destination |
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271 @param outlen [in/out] Max size and resulting size of the state |
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272 @param prng The PRNG to export |
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273 @return CRYPT_OK if successful |
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274 */ |
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275 int yarrow_export(unsigned char *out, unsigned long *outlen, prng_state *prng) |
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276 { |
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277 LTC_ARGCHK(out != NULL); |
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278 LTC_ARGCHK(outlen != NULL); |
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279 LTC_ARGCHK(prng != NULL); |
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280 |
382
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281 LTC_MUTEX_LOCK(&prng->yarrow.prng_lock); |
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282 |
285
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283 /* we'll write 64 bytes for s&g's */ |
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284 if (*outlen < 64) { |
382
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285 LTC_MUTEX_UNLOCK(&prng->yarrow.prng_lock); |
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286 *outlen = 64; |
285
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287 return CRYPT_BUFFER_OVERFLOW; |
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288 } |
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289 |
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290 if (yarrow_read(out, 64, prng) != 64) { |
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291 LTC_MUTEX_UNLOCK(&prng->yarrow.prng_lock); |
285
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292 return CRYPT_ERROR_READPRNG; |
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293 } |
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294 *outlen = 64; |
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295 |
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296 return CRYPT_OK; |
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297 } |
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298 |
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299 /** |
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300 Import a PRNG state |
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301 @param in The PRNG state |
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302 @param inlen Size of the state |
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303 @param prng The PRNG to import |
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304 @return CRYPT_OK if successful |
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305 */ |
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306 int yarrow_import(const unsigned char *in, unsigned long inlen, prng_state *prng) |
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307 { |
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308 int err; |
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309 |
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310 LTC_ARGCHK(in != NULL); |
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311 LTC_ARGCHK(prng != NULL); |
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312 |
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313 LTC_MUTEX_LOCK(&prng->yarrow.prng_lock); |
285
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314 |
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315 if (inlen != 64) { |
382
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316 LTC_MUTEX_UNLOCK(&prng->yarrow.prng_lock); |
285
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317 return CRYPT_INVALID_ARG; |
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318 } |
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319 |
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320 if ((err = yarrow_start(prng)) != CRYPT_OK) { |
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321 LTC_MUTEX_UNLOCK(&prng->yarrow.prng_lock); |
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322 return err; |
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323 } |
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324 err = yarrow_add_entropy(in, 64, prng); |
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325 LTC_MUTEX_UNLOCK(&prng->yarrow.prng_lock); |
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326 return err; |
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327 } |
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328 |
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329 /** |
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330 PRNG self-test |
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331 @return CRYPT_OK if successful, CRYPT_NOP if self-testing has been disabled |
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332 */ |
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333 int yarrow_test(void) |
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334 { |
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335 #ifndef LTC_TEST |
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336 return CRYPT_NOP; |
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337 #else |
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338 int err; |
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339 prng_state prng; |
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340 |
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341 if ((err = yarrow_start(&prng)) != CRYPT_OK) { |
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342 return err; |
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343 } |
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344 |
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345 /* now let's test the hash/cipher that was chosen */ |
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346 if ((err = cipher_descriptor[prng.yarrow.cipher].test()) != CRYPT_OK) { |
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347 return err; |
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348 } |
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349 if ((err = hash_descriptor[prng.yarrow.hash].test()) != CRYPT_OK) { |
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350 return err; |
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351 } |
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352 |
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353 return CRYPT_OK; |
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354 #endif |
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355 } |
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356 |
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357 #endif |
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358 |
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359 |
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360 /* $Source: /cvs/libtom/libtomcrypt/src/prngs/yarrow.c,v $ */ |
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361 /* $Revision: 1.10 $ */ |
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362 /* $Date: 2006/11/14 04:21:17 $ */ |