Mercurial > dovecot > original-hg > dovecot-1.2
annotate src/lib/md5.c @ 9490:fd84592e817b HEAD
dovecot-example.conf: Updated dict comments.
author | Timo Sirainen <tss@iki.fi> |
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date | Mon, 23 Nov 2009 13:08:47 -0500 |
parents | 0448f2fa8349 |
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rev | line source |
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0 | 1 /* |
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2 * This is an OpenSSL-compatible implementation of the RSA Data Security, |
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3 * Inc. MD5 Message-Digest Algorithm. |
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4 * |
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5 * Written by Solar Designer <solar@openwall.com> in 2001, and placed in |
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6 * the public domain. There's absolutely no warranty. |
0 | 7 * |
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8 * This differs from Colin Plumb's older public domain implementation in |
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9 * that no 32-bit integer data type is required, there's no compile-time |
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10 * endianness configuration, and the function prototypes match OpenSSL's. |
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11 * The primary goals are portability and ease of use. |
0 | 12 * |
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13 * This implementation is meant to be fast, but not as fast as possible. |
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14 * Some known optimizations are not included to reduce source code size |
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15 * and avoid compile-time configuration. |
0 | 16 */ |
17 | |
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18 #include "lib.h" |
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19 #include "safe-memset.h" |
0 | 20 #include "md5.h" |
21 | |
22 /* | |
21
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23 * The basic MD5 functions. |
0 | 24 * |
21
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25 * F is optimized compared to its RFC 1321 definition just like in Colin |
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26 * Plumb's implementation. |
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27 */ |
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28 #define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z)))) |
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29 #define G(x, y, z) ((y) ^ ((z) & ((x) ^ (y)))) |
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30 #define H(x, y, z) ((x) ^ (y) ^ (z)) |
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31 #define I(x, y, z) ((y) ^ ((x) | ~(z))) |
0 | 32 |
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33 /* |
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34 * The MD5 transformation for all four rounds. |
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35 */ |
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36 #define STEP(f, a, b, c, d, x, t, s) \ |
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37 (a) += f((b), (c), (d)) + (x) + (t); \ |
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38 (a) = (((a) << (s)) | (((a) & 0xffffffff) >> (32 - (s)))); \ |
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39 (a) += (b); |
0 | 40 |
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41 /* |
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42 * SET reads 4 input bytes in little-endian byte order and stores them |
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43 * in a properly aligned word in host byte order. |
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44 * |
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45 * The check for little-endian architectures which tolerate unaligned |
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46 * memory accesses is just an optimization. Nothing will break if it |
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47 * doesn't work. |
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48 */ |
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49 #if defined(__i386__) || defined(__x86_64__) || defined(__vax__) |
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50 #define SET(n) \ |
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51 (*(const uint_fast32_t *)&ptr[(n) * 4]) |
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52 #define GET(n) \ |
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53 SET(n) |
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54 #else |
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55 #define SET(n) \ |
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56 (ctx->block[(n)] = \ |
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57 (uint_fast32_t)ptr[(n) * 4] | \ |
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58 ((uint_fast32_t)ptr[(n) * 4 + 1] << 8) | \ |
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59 ((uint_fast32_t)ptr[(n) * 4 + 2] << 16) | \ |
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60 ((uint_fast32_t)ptr[(n) * 4 + 3] << 24)) |
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61 #define GET(n) \ |
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62 (ctx->block[(n)]) |
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63 #endif |
0 | 64 |
65 /* | |
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66 * This processes one or more 64-byte data blocks, but does NOT update |
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67 * the bit counters. There're no alignment requirements. |
0 | 68 */ |
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69 static const void *body(struct md5_context *ctx, const void *data, size_t size) |
0 | 70 { |
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71 const unsigned char *ptr; |
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72 uint_fast32_t a, b, c, d; |
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73 uint_fast32_t saved_a, saved_b, saved_c, saved_d; |
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74 |
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75 ptr = data; |
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76 |
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77 a = ctx->a; |
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78 b = ctx->b; |
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79 c = ctx->c; |
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80 d = ctx->d; |
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81 |
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82 do { |
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83 saved_a = a; |
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84 saved_b = b; |
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85 saved_c = c; |
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86 saved_d = d; |
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87 |
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88 /* Round 1 */ |
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89 STEP(F, a, b, c, d, SET(0), 0xd76aa478, 7) |
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90 STEP(F, d, a, b, c, SET(1), 0xe8c7b756, 12) |
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91 STEP(F, c, d, a, b, SET(2), 0x242070db, 17) |
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92 STEP(F, b, c, d, a, SET(3), 0xc1bdceee, 22) |
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93 STEP(F, a, b, c, d, SET(4), 0xf57c0faf, 7) |
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94 STEP(F, d, a, b, c, SET(5), 0x4787c62a, 12) |
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95 STEP(F, c, d, a, b, SET(6), 0xa8304613, 17) |
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96 STEP(F, b, c, d, a, SET(7), 0xfd469501, 22) |
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97 STEP(F, a, b, c, d, SET(8), 0x698098d8, 7) |
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98 STEP(F, d, a, b, c, SET(9), 0x8b44f7af, 12) |
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99 STEP(F, c, d, a, b, SET(10), 0xffff5bb1, 17) |
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100 STEP(F, b, c, d, a, SET(11), 0x895cd7be, 22) |
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101 STEP(F, a, b, c, d, SET(12), 0x6b901122, 7) |
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102 STEP(F, d, a, b, c, SET(13), 0xfd987193, 12) |
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103 STEP(F, c, d, a, b, SET(14), 0xa679438e, 17) |
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104 STEP(F, b, c, d, a, SET(15), 0x49b40821, 22) |
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105 |
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106 /* Round 2 */ |
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107 STEP(G, a, b, c, d, GET(1), 0xf61e2562, 5) |
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108 STEP(G, d, a, b, c, GET(6), 0xc040b340, 9) |
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109 STEP(G, c, d, a, b, GET(11), 0x265e5a51, 14) |
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110 STEP(G, b, c, d, a, GET(0), 0xe9b6c7aa, 20) |
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111 STEP(G, a, b, c, d, GET(5), 0xd62f105d, 5) |
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112 STEP(G, d, a, b, c, GET(10), 0x02441453, 9) |
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113 STEP(G, c, d, a, b, GET(15), 0xd8a1e681, 14) |
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114 STEP(G, b, c, d, a, GET(4), 0xe7d3fbc8, 20) |
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115 STEP(G, a, b, c, d, GET(9), 0x21e1cde6, 5) |
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116 STEP(G, d, a, b, c, GET(14), 0xc33707d6, 9) |
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117 STEP(G, c, d, a, b, GET(3), 0xf4d50d87, 14) |
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118 STEP(G, b, c, d, a, GET(8), 0x455a14ed, 20) |
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119 STEP(G, a, b, c, d, GET(13), 0xa9e3e905, 5) |
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120 STEP(G, d, a, b, c, GET(2), 0xfcefa3f8, 9) |
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121 STEP(G, c, d, a, b, GET(7), 0x676f02d9, 14) |
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122 STEP(G, b, c, d, a, GET(12), 0x8d2a4c8a, 20) |
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123 |
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124 /* Round 3 */ |
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125 STEP(H, a, b, c, d, GET(5), 0xfffa3942, 4) |
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126 STEP(H, d, a, b, c, GET(8), 0x8771f681, 11) |
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127 STEP(H, c, d, a, b, GET(11), 0x6d9d6122, 16) |
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128 STEP(H, b, c, d, a, GET(14), 0xfde5380c, 23) |
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129 STEP(H, a, b, c, d, GET(1), 0xa4beea44, 4) |
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130 STEP(H, d, a, b, c, GET(4), 0x4bdecfa9, 11) |
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131 STEP(H, c, d, a, b, GET(7), 0xf6bb4b60, 16) |
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132 STEP(H, b, c, d, a, GET(10), 0xbebfbc70, 23) |
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133 STEP(H, a, b, c, d, GET(13), 0x289b7ec6, 4) |
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134 STEP(H, d, a, b, c, GET(0), 0xeaa127fa, 11) |
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135 STEP(H, c, d, a, b, GET(3), 0xd4ef3085, 16) |
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136 STEP(H, b, c, d, a, GET(6), 0x04881d05, 23) |
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137 STEP(H, a, b, c, d, GET(9), 0xd9d4d039, 4) |
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138 STEP(H, d, a, b, c, GET(12), 0xe6db99e5, 11) |
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139 STEP(H, c, d, a, b, GET(15), 0x1fa27cf8, 16) |
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140 STEP(H, b, c, d, a, GET(2), 0xc4ac5665, 23) |
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141 |
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142 /* Round 4 */ |
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143 STEP(I, a, b, c, d, GET(0), 0xf4292244, 6) |
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144 STEP(I, d, a, b, c, GET(7), 0x432aff97, 10) |
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145 STEP(I, c, d, a, b, GET(14), 0xab9423a7, 15) |
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146 STEP(I, b, c, d, a, GET(5), 0xfc93a039, 21) |
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147 STEP(I, a, b, c, d, GET(12), 0x655b59c3, 6) |
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148 STEP(I, d, a, b, c, GET(3), 0x8f0ccc92, 10) |
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149 STEP(I, c, d, a, b, GET(10), 0xffeff47d, 15) |
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150 STEP(I, b, c, d, a, GET(1), 0x85845dd1, 21) |
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151 STEP(I, a, b, c, d, GET(8), 0x6fa87e4f, 6) |
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152 STEP(I, d, a, b, c, GET(15), 0xfe2ce6e0, 10) |
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153 STEP(I, c, d, a, b, GET(6), 0xa3014314, 15) |
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154 STEP(I, b, c, d, a, GET(13), 0x4e0811a1, 21) |
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155 STEP(I, a, b, c, d, GET(4), 0xf7537e82, 6) |
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156 STEP(I, d, a, b, c, GET(11), 0xbd3af235, 10) |
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157 STEP(I, c, d, a, b, GET(2), 0x2ad7d2bb, 15) |
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158 STEP(I, b, c, d, a, GET(9), 0xeb86d391, 21) |
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159 |
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160 a += saved_a; |
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|
161 b += saved_b; |
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162 c += saved_c; |
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163 d += saved_d; |
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164 |
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165 ptr += 64; |
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166 } while (size -= 64); |
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167 |
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168 ctx->a = a; |
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169 ctx->b = b; |
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170 ctx->c = c; |
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|
171 ctx->d = d; |
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172 |
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173 return ptr; |
0 | 174 } |
175 | |
903
fd8888f6f037
Naming style changes, finally got tired of most of the typedefs. Also the
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176 void md5_init(struct md5_context *ctx) |
21
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177 { |
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178 ctx->a = 0x67452301; |
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179 ctx->b = 0xefcdab89; |
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180 ctx->c = 0x98badcfe; |
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181 ctx->d = 0x10325476; |
0 | 182 |
21
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183 ctx->lo = 0; |
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184 ctx->hi = 0; |
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185 } |
0 | 186 |
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|
187 void md5_update(struct md5_context *ctx, const void *data, size_t size) |
0 | 188 { |
805
5ac361acb316
Marked all non-trivial buffer modifications with @UNSAFE tag. Several
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189 /* @UNSAFE */ |
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fd8888f6f037
Naming style changes, finally got tired of most of the typedefs. Also the
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|
190 uint_fast32_t saved_lo; |
21
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|
191 unsigned long used, free; |
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192 |
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|
193 saved_lo = ctx->lo; |
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194 if ((ctx->lo = (saved_lo + size) & 0x1fffffff) < saved_lo) |
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|
195 ctx->hi++; |
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196 ctx->hi += size >> 29; |
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197 |
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|
198 used = saved_lo & 0x3f; |
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|
199 |
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|
200 if (used) { |
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|
201 free = 64 - used; |
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|
202 |
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|
203 if (size < free) { |
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|
204 memcpy(&ctx->buffer[used], data, size); |
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|
205 return; |
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|
206 } |
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|
207 |
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|
208 memcpy(&ctx->buffer[used], data, free); |
579
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Several minor fixes: signess, casting away const, missing static, etc.
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|
209 data = (const unsigned char *) data + free; |
21
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|
210 size -= free; |
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|
211 body(ctx, ctx->buffer, 64); |
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|
212 } |
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|
213 |
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|
214 if (size >= 64) { |
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|
215 data = body(ctx, data, size & ~(unsigned long)0x3f); |
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|
216 size &= 0x3f; |
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|
217 } |
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|
218 |
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|
219 memcpy(ctx->buffer, data, size); |
0 | 220 } |
221 | |
4642 | 222 void md5_final(struct md5_context *ctx, unsigned char result[MD5_RESULTLEN]) |
21
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|
223 { |
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5ac361acb316
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|
224 /* @UNSAFE */ |
21
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225 unsigned long used, free; |
0 | 226 |
21
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|
227 used = ctx->lo & 0x3f; |
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|
228 |
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|
229 ctx->buffer[used++] = 0x80; |
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|
230 |
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|
231 free = 64 - used; |
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|
232 |
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|
233 if (free < 8) { |
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|
234 memset(&ctx->buffer[used], 0, free); |
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|
235 body(ctx, ctx->buffer, 64); |
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|
236 used = 0; |
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|
237 free = 64; |
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|
238 } |
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|
239 |
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|
240 memset(&ctx->buffer[used], 0, free - 8); |
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|
241 |
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changeset
|
242 ctx->lo <<= 3; |
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changeset
|
243 ctx->buffer[56] = ctx->lo; |
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|
244 ctx->buffer[57] = ctx->lo >> 8; |
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|
245 ctx->buffer[58] = ctx->lo >> 16; |
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|
246 ctx->buffer[59] = ctx->lo >> 24; |
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|
247 ctx->buffer[60] = ctx->hi; |
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|
248 ctx->buffer[61] = ctx->hi >> 8; |
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|
249 ctx->buffer[62] = ctx->hi >> 16; |
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250 ctx->buffer[63] = ctx->hi >> 24; |
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251 |
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252 body(ctx, ctx->buffer, 64); |
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253 |
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254 result[0] = ctx->a; |
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255 result[1] = ctx->a >> 8; |
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256 result[2] = ctx->a >> 16; |
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257 result[3] = ctx->a >> 24; |
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258 result[4] = ctx->b; |
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259 result[5] = ctx->b >> 8; |
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260 result[6] = ctx->b >> 16; |
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261 result[7] = ctx->b >> 24; |
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262 result[8] = ctx->c; |
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263 result[9] = ctx->c >> 8; |
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264 result[10] = ctx->c >> 16; |
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265 result[11] = ctx->c >> 24; |
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266 result[12] = ctx->d; |
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267 result[13] = ctx->d >> 8; |
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268 result[14] = ctx->d >> 16; |
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269 result[15] = ctx->d >> 24; |
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270 |
2337
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271 safe_memset(ctx, 0, sizeof(*ctx)); |
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272 } |
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273 |
4642 | 274 void md5_get_digest(const void *data, size_t size, |
275 unsigned char result[MD5_RESULTLEN]) | |
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276 { |
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277 struct md5_context ctx; |
0 | 278 |
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279 md5_init(&ctx); |
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280 md5_update(&ctx, data, size); |
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281 md5_final(&ctx, result); |
0 | 282 } |