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annotate yarrow.c @ 211:f01f0400314d libtomcrypt

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disapproval of revision 6a39eb8b36778460fca83b8149df2a8b6d3327fd
author Matt Johnston <matt@ucc.asn.au>
date Wed, 06 Jul 2005 13:23:45 +0000
parents b939f2d4431e
children 7ed585a2c53b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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20
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 *
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9 * Tom St Denis, [email protected], http://libtomcrypt.org
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10 */
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11
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12 #include "mycrypt.h"
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13
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14 #ifdef YARROW
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15
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16 const struct _prng_descriptor yarrow_desc =
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17 {
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18 "yarrow",
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19 &yarrow_start,
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20 &yarrow_add_entropy,
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21 &yarrow_ready,
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22 &yarrow_read
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23 };
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24
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25 int yarrow_start(prng_state *prng)
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26 {
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27 int err;
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28
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29 _ARGCHK(prng != NULL);
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30
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31 /* these are the default hash/cipher combo used */
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32 #ifdef RIJNDAEL
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33 #if YARROW_AES==0
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34 prng->yarrow.cipher = register_cipher(&rijndael_enc_desc);
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35 #elif YARROW_AES==1
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36 prng->yarrow.cipher = register_cipher(&aes_enc_desc);
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37 #elif YARROW_AES==2
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38 prng->yarrow.cipher = register_cipher(&rijndael_desc);
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39 #elif YARROW_AES==3
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40 prng->yarrow.cipher = register_cipher(&aes_desc);
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41 #endif
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42 #elif defined(BLOWFISH)
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43 prng->yarrow.cipher = register_cipher(&blowfish_desc);
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44 #elif defined(TWOFISH)
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45 prng->yarrow.cipher = register_cipher(&twofish_desc);
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46 #elif defined(RC6)
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47 prng->yarrow.cipher = register_cipher(&rc6_desc);
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48 #elif defined(RC5)
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49 prng->yarrow.cipher = register_cipher(&rc5_desc);
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50 #elif defined(SAFERP)
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51 prng->yarrow.cipher = register_cipher(&saferp_desc);
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52 #elif defined(RC2)
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53 prng->yarrow.cipher = register_cipher(&rc2_desc);
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54 #elif defined(NOEKEON)
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55 prng->yarrow.cipher = register_cipher(&noekeon_desc);
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56 #elif defined(CAST5)
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57 prng->yarrow.cipher = register_cipher(&cast5_desc);
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58 #elif defined(XTEA)
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59 prng->yarrow.cipher = register_cipher(&xtea_desc);
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60 #elif defined(SAFER)
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61 prng->yarrow.cipher = register_cipher(&safer_sk128_desc);
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62 #elif defined(DES)
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63 prng->yarrow.cipher = register_cipher(&des3_desc);
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64 #elif
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65 #error YARROW needs at least one CIPHER
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66 #endif
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67 if ((err = cipher_is_valid(prng->yarrow.cipher)) != CRYPT_OK) {
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68 return err;
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69 }
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70
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71 #ifdef SHA256
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72 prng->yarrow.hash = register_hash(&sha256_desc);
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73 #elif defined(SHA512)
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74 prng->yarrow.hash = register_hash(&sha512_desc);
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75 #elif defined(TIGER)
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76 prng->yarrow.hash = register_hash(&tiger_desc);
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77 #elif defined(SHA1)
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78 prng->yarrow.hash = register_hash(&sha1_desc);
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79 #elif defined(RIPEMD160)
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80 prng->yarrow.hash = register_hash(&rmd160_desc);
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81 #elif defined(RIPEMD128)
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82 prng->yarrow.hash = register_hash(&rmd128_desc);
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83 #elif defined(MD5)
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84 prng->yarrow.hash = register_hash(&md5_desc);
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85 #elif defined(MD4)
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86 prng->yarrow.hash = register_hash(&md4_desc);
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87 #elif defined(MD2)
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88 prng->yarrow.hash = register_hash(&md2_desc);
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89 #elif defined(WHIRLPOOL)
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90 prng->yarrow.hash = register_hash(&whirlpool_desc);
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91 #else
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92 #error YARROW needs at least one HASH
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93 #endif
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94 if ((err = hash_is_valid(prng->yarrow.hash)) != CRYPT_OK) {
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95 return err;
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96 }
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97
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98 /* zero the memory used */
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99 zeromem(prng->yarrow.pool, sizeof(prng->yarrow.pool));
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100
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101 return CRYPT_OK;
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102 }
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103
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104 int yarrow_add_entropy(const unsigned char *buf, unsigned long len, prng_state *prng)
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105 {
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106 hash_state md;
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107 int err;
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108
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109 _ARGCHK(buf != NULL);
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110 _ARGCHK(prng != NULL);
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111
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112 if ((err = hash_is_valid(prng->yarrow.hash)) != CRYPT_OK) {
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113 return err;
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114 }
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115
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116 /* start the hash */
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117 hash_descriptor[prng->yarrow.hash].init(&md);
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118
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119 /* hash the current pool */
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120 if ((err = hash_descriptor[prng->yarrow.hash].process(&md, prng->yarrow.pool,
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121 hash_descriptor[prng->yarrow.hash].hashsize)) != CRYPT_OK) {
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122 return err;
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123 }
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124
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125 /* add the new entropy */
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126 if ((err = hash_descriptor[prng->yarrow.hash].process(&md, buf, len)) != CRYPT_OK) {
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127 return err;
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128 }
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129
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130 /* store result */
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131 if ((err = hash_descriptor[prng->yarrow.hash].done(&md, prng->yarrow.pool)) != CRYPT_OK) {
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132 return err;
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133 }
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134
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135 return CRYPT_OK;
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136 }
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137
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138 int yarrow_ready(prng_state *prng)
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139 {
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140 int ks, err;
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141
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142 _ARGCHK(prng != NULL);
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143
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144 if ((err = hash_is_valid(prng->yarrow.hash)) != CRYPT_OK) {
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145 return err;
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146 }
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147
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148 if ((err = cipher_is_valid(prng->yarrow.cipher)) != CRYPT_OK) {
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149 return err;
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150 }
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151
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152 /* setup CTR mode using the "pool" as the key */
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153 ks = (int)hash_descriptor[prng->yarrow.hash].hashsize;
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154 if ((err = cipher_descriptor[prng->yarrow.cipher].keysize(&ks)) != CRYPT_OK) {
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155 return err;
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156 }
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157
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158 if ((err = ctr_start(prng->yarrow.cipher, /* what cipher to use */
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159 prng->yarrow.pool, /* IV */
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160 prng->yarrow.pool, ks, /* KEY and key size */
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161 0, /* number of rounds */
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162 &prng->yarrow.ctr)) != CRYPT_OK) {
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163 return err;
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164 }
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165 return CRYPT_OK;
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166 }
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167
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168 unsigned long yarrow_read(unsigned char *buf, unsigned long len, prng_state *prng)
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169 {
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170 _ARGCHK(buf != NULL);
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171 _ARGCHK(prng != NULL);
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172
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173 /* put buf in predictable state first */
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174 zeromem(buf, len);
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175
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176 /* now randomize it */
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177 if (ctr_encrypt(buf, buf, len, &prng->yarrow.ctr) != CRYPT_OK) {
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178 return 0;
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179 }
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180 return len;
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181 }
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182
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183 #endif
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184