Mercurial > dropbear
annotate libtomcrypt/src/hashes/chc/chc.c @ 603:3aa74a4d83ae
Refer to RFCs rather than drafts, update some section references
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sun, 27 Feb 2011 13:57:32 +0000 |
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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 |
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12 #include "tomcrypt.h" |
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13 |
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14 /** |
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15 @file chc.c |
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16 CHC support. (Tom St Denis) |
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17 */ |
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18 |
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19 #ifdef CHC_HASH |
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20 |
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21 #define UNDEFED_HASH -17 |
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22 |
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23 /* chc settings */ |
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24 static int cipher_idx=UNDEFED_HASH, /* which cipher */ |
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25 cipher_blocksize; /* blocksize of cipher */ |
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26 |
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27 |
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28 const struct ltc_hash_descriptor chc_desc = { |
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29 "chc_hash", 12, 0, 0, { 0 }, 0, |
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30 &chc_init, |
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31 &chc_process, |
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32 &chc_done, |
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33 &chc_test, |
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34 NULL |
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35 }; |
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36 |
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37 /** |
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38 Initialize the CHC state with a given cipher |
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39 @param cipher The index of the cipher you wish to bind |
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40 @return CRYPT_OK if successful |
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41 */ |
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42 int chc_register(int cipher) |
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43 { |
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44 int err, kl, idx; |
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45 |
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46 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { |
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47 return err; |
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48 } |
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49 |
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50 /* will it be valid? */ |
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51 kl = cipher_descriptor[cipher].block_length; |
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52 |
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53 /* must be >64 bit block */ |
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54 if (kl <= 8) { |
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55 return CRYPT_INVALID_CIPHER; |
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56 } |
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57 |
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58 /* can we use the ideal keysize? */ |
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59 if ((err = cipher_descriptor[cipher].keysize(&kl)) != CRYPT_OK) { |
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60 return err; |
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61 } |
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62 /* we require that key size == block size be a valid choice */ |
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63 if (kl != cipher_descriptor[cipher].block_length) { |
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64 return CRYPT_INVALID_CIPHER; |
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65 } |
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66 |
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67 /* determine if chc_hash has been register_hash'ed already */ |
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68 if ((err = hash_is_valid(idx = find_hash("chc_hash"))) != CRYPT_OK) { |
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69 return err; |
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70 } |
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71 |
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72 /* store into descriptor */ |
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73 hash_descriptor[idx].hashsize = |
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74 hash_descriptor[idx].blocksize = cipher_descriptor[cipher].block_length; |
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75 |
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76 /* store the idx and block size */ |
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77 cipher_idx = cipher; |
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78 cipher_blocksize = cipher_descriptor[cipher].block_length; |
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79 return CRYPT_OK; |
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80 } |
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81 |
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82 /** |
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83 Initialize the hash state |
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84 @param md The hash state you wish to initialize |
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85 @return CRYPT_OK if successful |
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86 */ |
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87 int chc_init(hash_state *md) |
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88 { |
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89 symmetric_key *key; |
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90 unsigned char buf[MAXBLOCKSIZE]; |
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91 int err; |
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92 |
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93 LTC_ARGCHK(md != NULL); |
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94 |
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95 /* is the cipher valid? */ |
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96 if ((err = cipher_is_valid(cipher_idx)) != CRYPT_OK) { |
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97 return err; |
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98 } |
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99 |
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100 if (cipher_blocksize != cipher_descriptor[cipher_idx].block_length) { |
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101 return CRYPT_INVALID_CIPHER; |
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102 } |
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103 |
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104 if ((key = XMALLOC(sizeof(*key))) == NULL) { |
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105 return CRYPT_MEM; |
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106 } |
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107 |
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108 /* zero key and what not */ |
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109 zeromem(buf, cipher_blocksize); |
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110 if ((err = cipher_descriptor[cipher_idx].setup(buf, cipher_blocksize, 0, key)) != CRYPT_OK) { |
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111 XFREE(key); |
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112 return err; |
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113 } |
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114 |
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115 /* encrypt zero block */ |
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116 cipher_descriptor[cipher_idx].ecb_encrypt(buf, md->chc.state, key); |
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117 |
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118 /* zero other members */ |
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119 md->chc.length = 0; |
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120 md->chc.curlen = 0; |
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121 zeromem(md->chc.buf, sizeof(md->chc.buf)); |
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122 XFREE(key); |
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123 return CRYPT_OK; |
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124 } |
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125 |
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126 /* |
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127 key <= state |
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128 T0,T1 <= block |
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129 T0 <= encrypt T0 |
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130 state <= state xor T0 xor T1 |
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131 */ |
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132 static int chc_compress(hash_state *md, unsigned char *buf) |
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133 { |
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134 unsigned char T[2][MAXBLOCKSIZE]; |
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135 symmetric_key *key; |
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136 int err, x; |
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137 |
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138 if ((key = XMALLOC(sizeof(*key))) == NULL) { |
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139 return CRYPT_MEM; |
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140 } |
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141 if ((err = cipher_descriptor[cipher_idx].setup(md->chc.state, cipher_blocksize, 0, key)) != CRYPT_OK) { |
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142 XFREE(key); |
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143 return err; |
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144 } |
382
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145 XMEMCPY(T[1], buf, cipher_blocksize); |
285
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146 cipher_descriptor[cipher_idx].ecb_encrypt(buf, T[0], key); |
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147 for (x = 0; x < cipher_blocksize; x++) { |
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148 md->chc.state[x] ^= T[0][x] ^ T[1][x]; |
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149 } |
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150 XFREE(key); |
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151 #ifdef LTC_CLEAN_STACK |
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152 zeromem(T, sizeof(T)); |
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153 zeromem(&key, sizeof(key)); |
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154 #endif |
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155 return CRYPT_OK; |
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156 } |
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157 |
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158 /* function for processing blocks */ |
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159 int _chc_process(hash_state * md, const unsigned char *buf, unsigned long len); |
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160 HASH_PROCESS(_chc_process, chc_compress, chc, (unsigned long)cipher_blocksize) |
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161 |
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162 /** |
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163 Process a block of memory though the hash |
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164 @param md The hash state |
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165 @param in The data to hash |
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166 @param inlen The length of the data (octets) |
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167 @return CRYPT_OK if successful |
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168 */ |
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169 int chc_process(hash_state * md, const unsigned char *in, unsigned long inlen) |
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170 { |
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171 int err; |
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172 |
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173 LTC_ARGCHK(md != NULL); |
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174 LTC_ARGCHK(in != NULL); |
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175 |
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176 /* is the cipher valid? */ |
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177 if ((err = cipher_is_valid(cipher_idx)) != CRYPT_OK) { |
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178 return err; |
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179 } |
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180 if (cipher_blocksize != cipher_descriptor[cipher_idx].block_length) { |
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181 return CRYPT_INVALID_CIPHER; |
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182 } |
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183 |
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184 return _chc_process(md, in, inlen); |
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185 } |
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186 |
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187 /** |
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188 Terminate the hash to get the digest |
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189 @param md The hash state |
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190 @param out [out] The destination of the hash (length of the block size of the block cipher) |
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191 @return CRYPT_OK if successful |
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192 */ |
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193 int chc_done(hash_state *md, unsigned char *out) |
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194 { |
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195 int err; |
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196 |
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197 LTC_ARGCHK(md != NULL); |
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198 LTC_ARGCHK(out != NULL); |
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199 |
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200 /* is the cipher valid? */ |
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201 if ((err = cipher_is_valid(cipher_idx)) != CRYPT_OK) { |
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202 return err; |
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203 } |
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204 if (cipher_blocksize != cipher_descriptor[cipher_idx].block_length) { |
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205 return CRYPT_INVALID_CIPHER; |
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206 } |
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207 |
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208 if (md->chc.curlen >= sizeof(md->chc.buf)) { |
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209 return CRYPT_INVALID_ARG; |
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210 } |
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211 |
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212 /* increase the length of the message */ |
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213 md->chc.length += md->chc.curlen * 8; |
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214 |
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215 /* append the '1' bit */ |
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216 md->chc.buf[md->chc.curlen++] = (unsigned char)0x80; |
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217 |
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218 /* if the length is currently above l-8 bytes we append zeros |
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219 * then compress. Then we can fall back to padding zeros and length |
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220 * encoding like normal. |
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221 */ |
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222 if (md->chc.curlen > (unsigned long)(cipher_blocksize - 8)) { |
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223 while (md->chc.curlen < (unsigned long)cipher_blocksize) { |
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224 md->chc.buf[md->chc.curlen++] = (unsigned char)0; |
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225 } |
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226 chc_compress(md, md->chc.buf); |
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227 md->chc.curlen = 0; |
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228 } |
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229 |
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230 /* pad upto l-8 bytes of zeroes */ |
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231 while (md->chc.curlen < (unsigned long)(cipher_blocksize - 8)) { |
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232 md->chc.buf[md->chc.curlen++] = (unsigned char)0; |
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233 } |
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234 |
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235 /* store length */ |
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236 STORE64L(md->chc.length, md->chc.buf+(cipher_blocksize-8)); |
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237 chc_compress(md, md->chc.buf); |
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238 |
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239 /* copy output */ |
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240 XMEMCPY(out, md->chc.state, cipher_blocksize); |
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241 |
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242 #ifdef LTC_CLEAN_STACK |
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243 zeromem(md, sizeof(hash_state)); |
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244 #endif |
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245 return CRYPT_OK; |
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246 } |
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247 |
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248 /** |
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249 Self-test the hash |
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250 @return CRYPT_OK if successful, CRYPT_NOP if self-tests have been disabled |
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251 */ |
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252 int chc_test(void) |
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253 { |
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254 static const struct { |
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255 unsigned char *msg, |
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256 md[MAXBLOCKSIZE]; |
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257 int len; |
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258 } tests[] = { |
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259 { |
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260 (unsigned char *)"hello world", |
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261 { 0xcf, 0x57, 0x9d, 0xc3, 0x0a, 0x0e, 0xea, 0x61, |
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262 0x0d, 0x54, 0x47, 0xc4, 0x3c, 0x06, 0xf5, 0x4e }, |
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263 16 |
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264 } |
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265 }; |
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266 int x, oldhashidx, idx; |
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267 unsigned char out[MAXBLOCKSIZE]; |
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268 hash_state md; |
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269 |
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270 /* AES can be under rijndael or aes... try to find it */ |
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271 if ((idx = find_cipher("aes")) == -1) { |
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272 if ((idx = find_cipher("rijndael")) == -1) { |
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273 return CRYPT_NOP; |
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274 } |
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275 } |
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276 oldhashidx = cipher_idx; |
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277 chc_register(idx); |
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278 |
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279 for (x = 0; x < (int)(sizeof(tests)/sizeof(tests[0])); x++) { |
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280 chc_init(&md); |
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281 chc_process(&md, tests[x].msg, strlen((char *)tests[x].msg)); |
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282 chc_done(&md, out); |
382
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283 if (XMEMCMP(out, tests[x].md, tests[x].len)) { |
285
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284 return CRYPT_FAIL_TESTVECTOR; |
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285 } |
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286 } |
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287 if (oldhashidx != UNDEFED_HASH) { |
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288 chc_register(oldhashidx); |
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289 } |
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290 |
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291 return CRYPT_OK; |
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292 } |
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293 |
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294 #endif |
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295 |
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296 /* $Source: /cvs/libtom/libtomcrypt/src/hashes/chc/chc.c,v $ */ |
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297 /* $Revision: 1.6 $ */ |
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298 /* $Date: 2006/11/01 09:28:17 $ */ |