Mercurial > dropbear
annotate libtomcrypt/src/hashes/chc/chc.c @ 1634:aabde6f57fce
Add a sanity check for DROPBEAR_SVR_MULTIUSER==0 mode
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 20 Mar 2019 22:57:06 +0800 |
parents | 6dba84798cd5 |
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
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2 * |
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3 * LibTomCrypt is a library that provides various cryptographic |
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4 * algorithms in a highly modular and flexible manner. |
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5 * |
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6 * The library is free for all purposes without any express |
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7 * guarantee it works. |
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8 */ |
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9 |
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10 #include "tomcrypt.h" |
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11 |
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12 /** |
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13 @file chc.c |
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14 CHC support. (Tom St Denis) |
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15 */ |
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16 |
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17 #ifdef LTC_CHC_HASH |
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18 |
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19 #define UNDEFED_HASH -17 |
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20 |
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21 /* chc settings */ |
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22 static int cipher_idx=UNDEFED_HASH, /* which cipher */ |
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23 cipher_blocksize; /* blocksize of cipher */ |
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24 |
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25 |
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26 const struct ltc_hash_descriptor chc_desc = { |
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27 "chc_hash", 12, 0, 0, { 0 }, 0, |
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28 &chc_init, |
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29 &chc_process, |
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30 &chc_done, |
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31 &chc_test, |
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32 NULL |
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33 }; |
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34 |
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35 /** |
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36 Initialize the CHC state with a given cipher |
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37 @param cipher The index of the cipher you wish to bind |
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38 @return CRYPT_OK if successful |
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39 */ |
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40 int chc_register(int cipher) |
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41 { |
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42 int err, kl, idx; |
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43 |
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44 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { |
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45 return err; |
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46 } |
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47 |
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48 /* will it be valid? */ |
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49 kl = cipher_descriptor[cipher].block_length; |
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50 |
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51 /* must be >64 bit block */ |
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52 if (kl <= 8) { |
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53 return CRYPT_INVALID_CIPHER; |
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54 } |
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55 |
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56 /* can we use the ideal keysize? */ |
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57 if ((err = cipher_descriptor[cipher].keysize(&kl)) != CRYPT_OK) { |
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58 return err; |
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59 } |
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60 /* we require that key size == block size be a valid choice */ |
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61 if (kl != cipher_descriptor[cipher].block_length) { |
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62 return CRYPT_INVALID_CIPHER; |
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63 } |
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64 |
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65 /* determine if chc_hash has been register_hash'ed already */ |
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66 if ((err = hash_is_valid(idx = find_hash("chc_hash"))) != CRYPT_OK) { |
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67 return err; |
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68 } |
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69 |
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70 /* store into descriptor */ |
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71 hash_descriptor[idx].hashsize = |
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72 hash_descriptor[idx].blocksize = cipher_descriptor[cipher].block_length; |
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73 |
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74 /* store the idx and block size */ |
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75 cipher_idx = cipher; |
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76 cipher_blocksize = cipher_descriptor[cipher].block_length; |
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77 return CRYPT_OK; |
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78 } |
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79 |
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80 /** |
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81 Initialize the hash state |
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82 @param md The hash state you wish to initialize |
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83 @return CRYPT_OK if successful |
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84 */ |
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85 int chc_init(hash_state *md) |
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86 { |
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87 symmetric_key *key; |
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88 unsigned char buf[MAXBLOCKSIZE]; |
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89 int err; |
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90 |
285
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91 LTC_ARGCHK(md != NULL); |
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92 |
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93 /* is the cipher valid? */ |
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94 if ((err = cipher_is_valid(cipher_idx)) != CRYPT_OK) { |
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95 return err; |
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96 } |
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97 |
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98 if (cipher_blocksize != cipher_descriptor[cipher_idx].block_length) { |
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99 return CRYPT_INVALID_CIPHER; |
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100 } |
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101 |
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102 if ((key = XMALLOC(sizeof(*key))) == NULL) { |
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103 return CRYPT_MEM; |
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104 } |
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105 |
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106 /* zero key and what not */ |
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107 zeromem(buf, cipher_blocksize); |
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108 if ((err = cipher_descriptor[cipher_idx].setup(buf, cipher_blocksize, 0, key)) != CRYPT_OK) { |
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109 XFREE(key); |
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110 return err; |
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111 } |
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112 |
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113 /* encrypt zero block */ |
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114 cipher_descriptor[cipher_idx].ecb_encrypt(buf, md->chc.state, key); |
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115 |
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116 /* zero other members */ |
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117 md->chc.length = 0; |
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118 md->chc.curlen = 0; |
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119 zeromem(md->chc.buf, sizeof(md->chc.buf)); |
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120 XFREE(key); |
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121 return CRYPT_OK; |
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122 } |
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123 |
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124 /* |
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125 key <= state |
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126 T0,T1 <= block |
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127 T0 <= encrypt T0 |
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128 state <= state xor T0 xor T1 |
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129 */ |
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130 static int chc_compress(hash_state *md, unsigned char *buf) |
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131 { |
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132 unsigned char T[2][MAXBLOCKSIZE]; |
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133 symmetric_key *key; |
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134 int err, x; |
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135 |
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136 if ((key = XMALLOC(sizeof(*key))) == NULL) { |
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137 return CRYPT_MEM; |
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138 } |
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139 if ((err = cipher_descriptor[cipher_idx].setup(md->chc.state, cipher_blocksize, 0, key)) != CRYPT_OK) { |
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140 XFREE(key); |
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141 return err; |
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142 } |
382
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143 XMEMCPY(T[1], buf, cipher_blocksize); |
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144 cipher_descriptor[cipher_idx].ecb_encrypt(buf, T[0], key); |
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145 for (x = 0; x < cipher_blocksize; x++) { |
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146 md->chc.state[x] ^= T[0][x] ^ T[1][x]; |
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147 } |
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148 #ifdef LTC_CLEAN_STACK |
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149 zeromem(T, sizeof(T)); |
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150 zeromem(key, sizeof(*key)); |
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151 #endif |
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152 XFREE(key); |
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153 return CRYPT_OK; |
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154 } |
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155 |
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156 /** |
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157 Function for processing blocks |
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158 @param md The hash state |
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159 @param buf The data to hash |
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160 @param len The length of the data (octets) |
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161 @return CRYPT_OK if successful |
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162 */ |
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163 static int _chc_process(hash_state * md, const unsigned char *buf, unsigned long len); |
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164 static HASH_PROCESS(_chc_process, chc_compress, chc, (unsigned long)cipher_blocksize) |
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165 |
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166 /** |
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167 Process a block of memory though the hash |
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168 @param md The hash state |
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169 @param in The data to hash |
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170 @param inlen The length of the data (octets) |
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171 @return CRYPT_OK if successful |
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172 */ |
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173 int chc_process(hash_state * md, const unsigned char *in, unsigned long inlen) |
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174 { |
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175 int err; |
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176 |
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177 LTC_ARGCHK(md != NULL); |
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178 LTC_ARGCHK(in != NULL); |
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179 |
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180 /* is the cipher valid? */ |
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181 if ((err = cipher_is_valid(cipher_idx)) != CRYPT_OK) { |
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182 return err; |
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183 } |
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184 if (cipher_blocksize != cipher_descriptor[cipher_idx].block_length) { |
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185 return CRYPT_INVALID_CIPHER; |
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186 } |
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187 |
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188 return _chc_process(md, in, inlen); |
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189 } |
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190 |
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191 /** |
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192 Terminate the hash to get the digest |
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193 @param md The hash state |
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194 @param out [out] The destination of the hash (length of the block size of the block cipher) |
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195 @return CRYPT_OK if successful |
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196 */ |
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197 int chc_done(hash_state *md, unsigned char *out) |
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198 { |
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199 int err; |
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200 |
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201 LTC_ARGCHK(md != NULL); |
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202 LTC_ARGCHK(out != NULL); |
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203 |
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204 /* is the cipher valid? */ |
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205 if ((err = cipher_is_valid(cipher_idx)) != CRYPT_OK) { |
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206 return err; |
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207 } |
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208 if (cipher_blocksize != cipher_descriptor[cipher_idx].block_length) { |
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209 return CRYPT_INVALID_CIPHER; |
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210 } |
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211 |
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212 if (md->chc.curlen >= sizeof(md->chc.buf)) { |
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213 return CRYPT_INVALID_ARG; |
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214 } |
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215 |
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216 /* increase the length of the message */ |
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217 md->chc.length += md->chc.curlen * 8; |
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218 |
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219 /* append the '1' bit */ |
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220 md->chc.buf[md->chc.curlen++] = (unsigned char)0x80; |
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221 |
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222 /* if the length is currently above l-8 bytes we append zeros |
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223 * then compress. Then we can fall back to padding zeros and length |
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224 * encoding like normal. |
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225 */ |
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226 if (md->chc.curlen > (unsigned long)(cipher_blocksize - 8)) { |
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227 while (md->chc.curlen < (unsigned long)cipher_blocksize) { |
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228 md->chc.buf[md->chc.curlen++] = (unsigned char)0; |
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229 } |
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230 chc_compress(md, md->chc.buf); |
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231 md->chc.curlen = 0; |
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232 } |
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233 |
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234 /* pad upto l-8 bytes of zeroes */ |
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235 while (md->chc.curlen < (unsigned long)(cipher_blocksize - 8)) { |
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236 md->chc.buf[md->chc.curlen++] = (unsigned char)0; |
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237 } |
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238 |
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239 /* store length */ |
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240 STORE64L(md->chc.length, md->chc.buf+(cipher_blocksize-8)); |
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241 chc_compress(md, md->chc.buf); |
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242 |
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243 /* copy output */ |
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244 XMEMCPY(out, md->chc.state, cipher_blocksize); |
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245 |
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246 #ifdef LTC_CLEAN_STACK |
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247 zeromem(md, sizeof(hash_state)); |
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248 #endif |
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249 return CRYPT_OK; |
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250 } |
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251 |
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252 /** |
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253 Self-test the hash |
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254 @return CRYPT_OK if successful, CRYPT_NOP if self-tests have been disabled |
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255 */ |
285
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256 int chc_test(void) |
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257 { |
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258 #ifndef LTC_TEST |
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259 return CRYPT_NOP; |
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260 #else |
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261 static const struct { |
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262 unsigned char *msg, |
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263 hash[MAXBLOCKSIZE]; |
285
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264 int len; |
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265 } tests[] = { |
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266 { |
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267 (unsigned char *)"hello world", |
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268 { 0xcf, 0x57, 0x9d, 0xc3, 0x0a, 0x0e, 0xea, 0x61, |
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269 0x0d, 0x54, 0x47, 0xc4, 0x3c, 0x06, 0xf5, 0x4e }, |
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270 16 |
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271 } |
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272 }; |
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273 int i, oldhashidx, idx; |
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274 unsigned char tmp[MAXBLOCKSIZE]; |
285
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275 hash_state md; |
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276 |
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277 /* AES can be under rijndael or aes... try to find it */ |
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278 if ((idx = find_cipher("aes")) == -1) { |
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279 if ((idx = find_cipher("rijndael")) == -1) { |
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280 return CRYPT_NOP; |
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281 } |
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282 } |
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283 oldhashidx = cipher_idx; |
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284 chc_register(idx); |
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285 |
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286 for (i = 0; i < (int)(sizeof(tests)/sizeof(tests[0])); i++) { |
285
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287 chc_init(&md); |
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288 chc_process(&md, tests[i].msg, strlen((char *)tests[i].msg)); |
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289 chc_done(&md, tmp); |
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290 if (compare_testvector(tmp, tests[i].len, tests[i].hash, tests[i].len, "CHC", i)) { |
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291 return CRYPT_FAIL_TESTVECTOR; |
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292 } |
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293 } |
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294 if (oldhashidx != UNDEFED_HASH) { |
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295 chc_register(oldhashidx); |
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296 } |
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297 |
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298 return CRYPT_OK; |
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299 #endif |
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300 } |
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301 |
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302 #endif |
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303 |
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304 /* ref: $Format:%D$ */ |
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305 /* git commit: $Format:%H$ */ |
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306 /* commit time: $Format:%ai$ */ |