annotate md4.c @ 0:d7da3b1e1540 libtomcrypt

put back the 0.95 makefile which was inadvertently merged over
author Matt Johnston <matt@ucc.asn.au>
date Mon, 31 May 2004 18:21:40 +0000
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children 6362d3854bb4
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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 /* Submitted by Dobes Vandermeer ([email protected]) */
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12 #include "mycrypt.h"
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13
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14 #ifdef MD4
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15
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16 const struct _hash_descriptor md4_desc =
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17 {
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18 "md4",
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19 6,
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20 16,
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21 64,
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22 &md4_init,
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23 &md4_process,
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24 &md4_done,
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25 &md4_test
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26 };
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27
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28 #define S11 3
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29 #define S12 7
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30 #define S13 11
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31 #define S14 19
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32 #define S21 3
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33 #define S22 5
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34 #define S23 9
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35 #define S24 13
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36 #define S31 3
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37 #define S32 9
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38 #define S33 11
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39 #define S34 15
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40
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41 /* F, G and H are basic MD4 functions. */
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42 #define F(x, y, z) (z ^ (x & (y ^ z)))
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43 #define G(x, y, z) ((x & y) | (z & (x | y)))
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44 #define H(x, y, z) ((x) ^ (y) ^ (z))
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45
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46 /* ROTATE_LEFT rotates x left n bits. */
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47 #define ROTATE_LEFT(x, n) ROL(x, n)
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48
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49 /* FF, GG and HH are transformations for rounds 1, 2 and 3 */
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50 /* Rotation is separate from addition to prevent recomputation */
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51
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52 #define FF(a, b, c, d, x, s) { \
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53 (a) += F ((b), (c), (d)) + (x); \
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54 (a) = ROTATE_LEFT ((a), (s)); \
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55 }
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56 #define GG(a, b, c, d, x, s) { \
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57 (a) += G ((b), (c), (d)) + (x) + 0x5a827999UL; \
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58 (a) = ROTATE_LEFT ((a), (s)); \
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59 }
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60 #define HH(a, b, c, d, x, s) { \
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61 (a) += H ((b), (c), (d)) + (x) + 0x6ed9eba1UL; \
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62 (a) = ROTATE_LEFT ((a), (s)); \
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63 }
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64
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65 #ifdef CLEAN_STACK
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66 static void _md4_compress(hash_state *md, unsigned char *buf)
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67 #else
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68 static void md4_compress(hash_state *md, unsigned char *buf)
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69 #endif
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70 {
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71 ulong32 x[16], a, b, c, d;
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72 int i;
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73
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74 /* copy state */
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75 a = md->md4.state[0];
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76 b = md->md4.state[1];
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77 c = md->md4.state[2];
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78 d = md->md4.state[3];
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79
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80 /* copy the state into 512-bits into W[0..15] */
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81 for (i = 0; i < 16; i++) {
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82 LOAD32L(x[i], buf + (4*i));
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83 }
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84
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85 /* Round 1 */
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86 FF (a, b, c, d, x[ 0], S11); /* 1 */
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87 FF (d, a, b, c, x[ 1], S12); /* 2 */
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88 FF (c, d, a, b, x[ 2], S13); /* 3 */
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89 FF (b, c, d, a, x[ 3], S14); /* 4 */
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90 FF (a, b, c, d, x[ 4], S11); /* 5 */
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91 FF (d, a, b, c, x[ 5], S12); /* 6 */
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92 FF (c, d, a, b, x[ 6], S13); /* 7 */
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93 FF (b, c, d, a, x[ 7], S14); /* 8 */
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94 FF (a, b, c, d, x[ 8], S11); /* 9 */
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95 FF (d, a, b, c, x[ 9], S12); /* 10 */
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96 FF (c, d, a, b, x[10], S13); /* 11 */
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97 FF (b, c, d, a, x[11], S14); /* 12 */
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98 FF (a, b, c, d, x[12], S11); /* 13 */
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99 FF (d, a, b, c, x[13], S12); /* 14 */
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100 FF (c, d, a, b, x[14], S13); /* 15 */
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101 FF (b, c, d, a, x[15], S14); /* 16 */
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102
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103 /* Round 2 */
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104 GG (a, b, c, d, x[ 0], S21); /* 17 */
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105 GG (d, a, b, c, x[ 4], S22); /* 18 */
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106 GG (c, d, a, b, x[ 8], S23); /* 19 */
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107 GG (b, c, d, a, x[12], S24); /* 20 */
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108 GG (a, b, c, d, x[ 1], S21); /* 21 */
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109 GG (d, a, b, c, x[ 5], S22); /* 22 */
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110 GG (c, d, a, b, x[ 9], S23); /* 23 */
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111 GG (b, c, d, a, x[13], S24); /* 24 */
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112 GG (a, b, c, d, x[ 2], S21); /* 25 */
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113 GG (d, a, b, c, x[ 6], S22); /* 26 */
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114 GG (c, d, a, b, x[10], S23); /* 27 */
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115 GG (b, c, d, a, x[14], S24); /* 28 */
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116 GG (a, b, c, d, x[ 3], S21); /* 29 */
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117 GG (d, a, b, c, x[ 7], S22); /* 30 */
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118 GG (c, d, a, b, x[11], S23); /* 31 */
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119 GG (b, c, d, a, x[15], S24); /* 32 */
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120
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121 /* Round 3 */
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122 HH (a, b, c, d, x[ 0], S31); /* 33 */
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123 HH (d, a, b, c, x[ 8], S32); /* 34 */
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124 HH (c, d, a, b, x[ 4], S33); /* 35 */
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125 HH (b, c, d, a, x[12], S34); /* 36 */
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126 HH (a, b, c, d, x[ 2], S31); /* 37 */
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127 HH (d, a, b, c, x[10], S32); /* 38 */
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128 HH (c, d, a, b, x[ 6], S33); /* 39 */
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129 HH (b, c, d, a, x[14], S34); /* 40 */
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130 HH (a, b, c, d, x[ 1], S31); /* 41 */
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131 HH (d, a, b, c, x[ 9], S32); /* 42 */
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132 HH (c, d, a, b, x[ 5], S33); /* 43 */
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133 HH (b, c, d, a, x[13], S34); /* 44 */
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134 HH (a, b, c, d, x[ 3], S31); /* 45 */
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135 HH (d, a, b, c, x[11], S32); /* 46 */
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136 HH (c, d, a, b, x[ 7], S33); /* 47 */
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137 HH (b, c, d, a, x[15], S34); /* 48 */
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138
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139
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140 /* Update our state */
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141 md->md4.state[0] = md->md4.state[0] + a;
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142 md->md4.state[1] = md->md4.state[1] + b;
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143 md->md4.state[2] = md->md4.state[2] + c;
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144 md->md4.state[3] = md->md4.state[3] + d;
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145 }
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146
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147 #ifdef CLEAN_STACK
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148 static void md4_compress(hash_state *md, unsigned char *buf)
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149 {
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150 _md4_compress(md, buf);
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151 burn_stack(sizeof(ulong32) * 20 + sizeof(int));
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152 }
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153 #endif
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154
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155 void md4_init(hash_state * md)
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156 {
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157 _ARGCHK(md != NULL);
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158 md->md4.state[0] = 0x67452301UL;
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159 md->md4.state[1] = 0xefcdab89UL;
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160 md->md4.state[2] = 0x98badcfeUL;
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161 md->md4.state[3] = 0x10325476UL;
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162 md->md4.length = 0;
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163 md->md4.curlen = 0;
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164 }
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165
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166 HASH_PROCESS(md4_process, md4_compress, md4, 64)
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167
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168 int md4_done(hash_state * md, unsigned char *hash)
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169 {
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170 int i;
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171
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172 _ARGCHK(md != NULL);
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173 _ARGCHK(hash != NULL);
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174
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175 if (md->md4.curlen >= sizeof(md->md4.buf)) {
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176 return CRYPT_INVALID_ARG;
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177 }
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178
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179 /* increase the length of the message */
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180 md->md4.length += md->md4.curlen * 8;
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181
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182 /* append the '1' bit */
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183 md->md4.buf[md->md4.curlen++] = (unsigned char)0x80;
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184
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185 /* if the length is currently above 56 bytes we append zeros
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186 * then compress. Then we can fall back to padding zeros and length
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187 * encoding like normal.
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188 */
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189 if (md->md4.curlen > 56) {
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190 while (md->md4.curlen < 64) {
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191 md->md4.buf[md->md4.curlen++] = (unsigned char)0;
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192 }
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193 md4_compress(md, md->md4.buf);
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194 md->md4.curlen = 0;
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195 }
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196
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197 /* pad upto 56 bytes of zeroes */
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198 while (md->md4.curlen < 56) {
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199 md->md4.buf[md->md4.curlen++] = (unsigned char)0;
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200 }
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201
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202 /* store length */
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203 STORE64L(md->md4.length, md->md4.buf+56);
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204 md4_compress(md, md->md4.buf);
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205
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206 /* copy output */
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207 for (i = 0; i < 4; i++) {
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208 STORE32L(md->md4.state[i], hash+(4*i));
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209 }
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210 #ifdef CLEAN_STACK
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211 zeromem(md, sizeof(hash_state));
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diff changeset
212 #endif
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213 return CRYPT_OK;
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214 }
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215
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216 int md4_test(void)
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217 {
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218 #ifndef LTC_TEST
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219 return CRYPT_NOP;
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220 #else
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221 static const struct md4_test_case {
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222 char *input;
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223 unsigned char digest[16];
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224 } cases[] = {
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225 { "",
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226 {0x31, 0xd6, 0xcf, 0xe0, 0xd1, 0x6a, 0xe9, 0x31,
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diff changeset
227 0xb7, 0x3c, 0x59, 0xd7, 0xe0, 0xc0, 0x89, 0xc0} },
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228 { "a",
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229 {0xbd, 0xe5, 0x2c, 0xb3, 0x1d, 0xe3, 0x3e, 0x46,
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diff changeset
230 0x24, 0x5e, 0x05, 0xfb, 0xdb, 0xd6, 0xfb, 0x24} },
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diff changeset
231 { "abc",
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232 {0xa4, 0x48, 0x01, 0x7a, 0xaf, 0x21, 0xd8, 0x52,
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diff changeset
233 0x5f, 0xc1, 0x0a, 0xe8, 0x7a, 0xa6, 0x72, 0x9d} },
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234 { "message digest",
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235 {0xd9, 0x13, 0x0a, 0x81, 0x64, 0x54, 0x9f, 0xe8,
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diff changeset
236 0x18, 0x87, 0x48, 0x06, 0xe1, 0xc7, 0x01, 0x4b} },
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237 { "abcdefghijklmnopqrstuvwxyz",
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diff changeset
238 {0xd7, 0x9e, 0x1c, 0x30, 0x8a, 0xa5, 0xbb, 0xcd,
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diff changeset
239 0xee, 0xa8, 0xed, 0x63, 0xdf, 0x41, 0x2d, 0xa9} },
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240 { "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
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diff changeset
241 {0x04, 0x3f, 0x85, 0x82, 0xf2, 0x41, 0xdb, 0x35,
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diff changeset
242 0x1c, 0xe6, 0x27, 0xe1, 0x53, 0xe7, 0xf0, 0xe4} },
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diff changeset
243 { "12345678901234567890123456789012345678901234567890123456789012345678901234567890",
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diff changeset
244 {0xe3, 0x3b, 0x4d, 0xdc, 0x9c, 0x38, 0xf2, 0x19,
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diff changeset
245 0x9c, 0x3e, 0x7b, 0x16, 0x4f, 0xcc, 0x05, 0x36} },
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246 };
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247 int i;
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248 hash_state md;
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diff changeset
249 unsigned char digest[16];
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diff changeset
250
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251 for(i = 0; i < (int)(sizeof(cases) / sizeof(cases[0])); i++) {
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diff changeset
252 md4_init(&md);
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diff changeset
253 md4_process(&md, (unsigned char *)cases[i].input, (unsigned long)strlen(cases[i].input));
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diff changeset
254 md4_done(&md, digest);
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diff changeset
255 if (memcmp(digest, cases[i].digest, 16) != 0) {
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256 return CRYPT_FAIL_TESTVECTOR;
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diff changeset
257 }
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258
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259 }
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260 return CRYPT_OK;
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261 #endif
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262 }
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263
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264 #endif
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265
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266