Mercurial > dropbear
annotate libtomcrypt/src/hashes/md2.c @ 469:8c2d2edadf2a
Update to debian 0.50-4 diff
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 27 Mar 2008 10:19:28 +0000 |
parents | 0cbe8f6dbf9e |
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 @param md2.c |
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15 MD2 (RFC 1319) hash function implementation by Tom St Denis |
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16 */ |
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17 |
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18 #ifdef MD2 |
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19 |
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20 const struct ltc_hash_descriptor md2_desc = |
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21 { |
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22 "md2", |
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23 7, |
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24 16, |
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25 16, |
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26 |
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27 /* OID */ |
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28 { 1, 2, 840, 113549, 2, 2, }, |
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29 6, |
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30 |
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31 &md2_init, |
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32 &md2_process, |
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33 &md2_done, |
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34 &md2_test, |
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35 NULL |
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36 }; |
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37 |
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38 static const unsigned char PI_SUBST[256] = { |
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39 41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6, |
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40 19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188, |
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41 76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24, |
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42 138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251, |
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43 245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63, |
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44 148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50, |
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45 39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165, |
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46 181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210, |
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47 150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157, |
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48 112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27, |
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49 96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15, |
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50 85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197, |
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51 234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65, |
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52 129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123, |
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53 8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233, |
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54 203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228, |
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55 166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237, |
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56 31, 26, 219, 153, 141, 51, 159, 17, 131, 20 |
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57 }; |
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58 |
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59 /* adds 16 bytes to the checksum */ |
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60 static void md2_update_chksum(hash_state *md) |
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61 { |
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62 int j; |
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63 unsigned char L; |
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64 L = md->md2.chksum[15]; |
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65 for (j = 0; j < 16; j++) { |
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66 |
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67 /* caution, the RFC says its "C[j] = S[M[i*16+j] xor L]" but the reference source code [and test vectors] say |
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68 otherwise. |
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69 */ |
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70 L = (md->md2.chksum[j] ^= PI_SUBST[(int)(md->md2.buf[j] ^ L)] & 255); |
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71 } |
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72 } |
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73 |
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74 static void md2_compress(hash_state *md) |
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75 { |
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76 int j, k; |
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77 unsigned char t; |
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78 |
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79 /* copy block */ |
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80 for (j = 0; j < 16; j++) { |
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81 md->md2.X[16+j] = md->md2.buf[j]; |
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82 md->md2.X[32+j] = md->md2.X[j] ^ md->md2.X[16+j]; |
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83 } |
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84 |
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85 t = (unsigned char)0; |
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86 |
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87 /* do 18 rounds */ |
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88 for (j = 0; j < 18; j++) { |
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89 for (k = 0; k < 48; k++) { |
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90 t = (md->md2.X[k] ^= PI_SUBST[(int)(t & 255)]); |
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91 } |
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92 t = (t + (unsigned char)j) & 255; |
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93 } |
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94 } |
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95 |
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96 /** |
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97 Initialize the hash state |
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98 @param md The hash state you wish to initialize |
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99 @return CRYPT_OK if successful |
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100 */ |
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101 int md2_init(hash_state *md) |
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102 { |
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103 LTC_ARGCHK(md != NULL); |
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104 |
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105 /* MD2 uses a zero'ed state... */ |
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106 zeromem(md->md2.X, sizeof(md->md2.X)); |
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107 zeromem(md->md2.chksum, sizeof(md->md2.chksum)); |
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108 zeromem(md->md2.buf, sizeof(md->md2.buf)); |
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109 md->md2.curlen = 0; |
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110 return CRYPT_OK; |
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111 } |
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112 |
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113 /** |
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114 Process a block of memory though the hash |
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115 @param md The hash state |
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116 @param in The data to hash |
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117 @param inlen The length of the data (octets) |
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118 @return CRYPT_OK if successful |
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119 */ |
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120 int md2_process(hash_state *md, const unsigned char *in, unsigned long inlen) |
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121 { |
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122 unsigned long n; |
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123 LTC_ARGCHK(md != NULL); |
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124 LTC_ARGCHK(in != NULL); |
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125 if (md-> md2 .curlen > sizeof(md-> md2 .buf)) { |
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126 return CRYPT_INVALID_ARG; |
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127 } |
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128 while (inlen > 0) { |
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129 n = MIN(inlen, (16 - md->md2.curlen)); |
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130 XMEMCPY(md->md2.buf + md->md2.curlen, in, (size_t)n); |
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131 md->md2.curlen += n; |
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132 in += n; |
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133 inlen -= n; |
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134 |
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135 /* is 16 bytes full? */ |
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136 if (md->md2.curlen == 16) { |
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137 md2_compress(md); |
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138 md2_update_chksum(md); |
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139 md->md2.curlen = 0; |
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140 } |
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141 } |
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142 return CRYPT_OK; |
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143 } |
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144 |
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145 /** |
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146 Terminate the hash to get the digest |
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147 @param md The hash state |
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148 @param out [out] The destination of the hash (16 bytes) |
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149 @return CRYPT_OK if successful |
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150 */ |
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151 int md2_done(hash_state * md, unsigned char *out) |
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152 { |
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153 unsigned long i, k; |
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154 |
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155 LTC_ARGCHK(md != NULL); |
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156 LTC_ARGCHK(out != NULL); |
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157 |
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158 if (md->md2.curlen >= sizeof(md->md2.buf)) { |
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159 return CRYPT_INVALID_ARG; |
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160 } |
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161 |
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162 |
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163 /* pad the message */ |
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164 k = 16 - md->md2.curlen; |
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165 for (i = md->md2.curlen; i < 16; i++) { |
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166 md->md2.buf[i] = (unsigned char)k; |
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167 } |
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168 |
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169 /* hash and update */ |
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170 md2_compress(md); |
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171 md2_update_chksum(md); |
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172 |
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173 /* hash checksum */ |
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174 XMEMCPY(md->md2.buf, md->md2.chksum, 16); |
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175 md2_compress(md); |
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176 |
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177 /* output is lower 16 bytes of X */ |
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178 XMEMCPY(out, md->md2.X, 16); |
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179 |
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180 #ifdef LTC_CLEAN_STACK |
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181 zeromem(md, sizeof(hash_state)); |
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182 #endif |
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183 return CRYPT_OK; |
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184 } |
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185 |
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186 /** |
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187 Self-test the hash |
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188 @return CRYPT_OK if successful, CRYPT_NOP if self-tests have been disabled |
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189 */ |
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190 int md2_test(void) |
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191 { |
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192 #ifndef LTC_TEST |
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193 return CRYPT_NOP; |
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194 #else |
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195 static const struct { |
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196 char *msg; |
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197 unsigned char md[16]; |
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198 } tests[] = { |
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199 { "", |
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200 {0x83,0x50,0xe5,0xa3,0xe2,0x4c,0x15,0x3d, |
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201 0xf2,0x27,0x5c,0x9f,0x80,0x69,0x27,0x73 |
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202 } |
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203 }, |
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204 { "a", |
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205 {0x32,0xec,0x01,0xec,0x4a,0x6d,0xac,0x72, |
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206 0xc0,0xab,0x96,0xfb,0x34,0xc0,0xb5,0xd1 |
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207 } |
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208 }, |
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209 { "message digest", |
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210 {0xab,0x4f,0x49,0x6b,0xfb,0x2a,0x53,0x0b, |
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211 0x21,0x9f,0xf3,0x30,0x31,0xfe,0x06,0xb0 |
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212 } |
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213 }, |
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214 { "abcdefghijklmnopqrstuvwxyz", |
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215 {0x4e,0x8d,0xdf,0xf3,0x65,0x02,0x92,0xab, |
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216 0x5a,0x41,0x08,0xc3,0xaa,0x47,0x94,0x0b |
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217 } |
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218 }, |
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219 { "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789", |
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220 {0xda,0x33,0xde,0xf2,0xa4,0x2d,0xf1,0x39, |
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221 0x75,0x35,0x28,0x46,0xc3,0x03,0x38,0xcd |
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222 } |
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223 }, |
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224 { "12345678901234567890123456789012345678901234567890123456789012345678901234567890", |
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225 {0xd5,0x97,0x6f,0x79,0xd8,0x3d,0x3a,0x0d, |
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226 0xc9,0x80,0x6c,0x3c,0x66,0xf3,0xef,0xd8 |
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227 } |
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228 } |
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229 }; |
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230 int i; |
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231 hash_state md; |
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232 unsigned char buf[16]; |
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233 |
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234 for (i = 0; i < (int)(sizeof(tests) / sizeof(tests[0])); i++) { |
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235 md2_init(&md); |
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236 md2_process(&md, (unsigned char*)tests[i].msg, (unsigned long)strlen(tests[i].msg)); |
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237 md2_done(&md, buf); |
382
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238 if (XMEMCMP(buf, tests[i].md, 16) != 0) { |
285
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239 return CRYPT_FAIL_TESTVECTOR; |
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240 } |
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241 } |
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242 return CRYPT_OK; |
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243 #endif |
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244 } |
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245 |
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246 #endif |
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247 |
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248 |
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249 /* $Source: /cvs/libtom/libtomcrypt/src/hashes/md2.c,v $ */ |
382
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250 /* $Revision: 1.8 $ */ |
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251 /* $Date: 2006/11/01 09:28:17 $ */ |