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annotate src/md5/md5.c @ 285:bdcc2b42eb0f

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Heavily reworked man/masqmail.8 I hope the new version is clearer.
author markus schnalke <meillo@marmaro.de>
date Tue, 07 Dec 2010 17:10:07 -0300 (2010-12-07)
parents 10da50168dab
children
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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 (RFC 1321).
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4 *
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5 * Written by Solar Designer <solar at openwall.com> in 2001, and placed
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6 * in the public domain. There's absolutely no warranty.
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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.
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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.
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16 */
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17
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18 #ifndef HAVE_OPENSSL
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19
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20 #include <string.h>
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21
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22 #include "md5.h"
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23
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24 /*
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25 * The basic MD5 functions.
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26 *
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27 * F and G are optimized compared to their RFC 1321 definitions for
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28 * architectures that lack an AND-NOT instruction, just like in Colin Plumb's
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29 * implementation.
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30 */
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31 #define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
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32 #define G(x, y, z) ((y) ^ ((z) & ((x) ^ (y))))
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33 #define H(x, y, z) ((x) ^ (y) ^ (z))
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34 #define I(x, y, z) ((y) ^ ((x) | ~(z)))
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35
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36 /*
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37 * The MD5 transformation for all four rounds.
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38 */
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39 #define STEP(f, a, b, c, d, x, t, s) \
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40 (a) += f((b), (c), (d)) + (x) + (t); \
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41 (a) = (((a) << (s)) | (((a) & 0xffffffff) >> (32 - (s)))); \
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42 (a) += (b);
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43
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44 /*
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45 * SET reads 4 input bytes in little-endian byte order and stores them
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46 * in a properly aligned word in host byte order.
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47 *
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48 * The check for little-endian architectures that tolerate unaligned
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49 * memory accesses is just an optimization. Nothing will break if it
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50 * doesn't work.
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51 */
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52 #if defined(__i386__) || defined(__x86_64__) || defined(__vax__)
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53 #define SET(n) \
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54 (*(MD5_u32plus *)&ptr[(n) * 4])
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55 #define GET(n) \
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56 SET(n)
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57 #else
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58 #define SET(n) \
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59 (ctx->block[(n)] = \
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60 (MD5_u32plus)ptr[(n) * 4] | \
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61 ((MD5_u32plus)ptr[(n) * 4 + 1] << 8) | \
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62 ((MD5_u32plus)ptr[(n) * 4 + 2] << 16) | \
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63 ((MD5_u32plus)ptr[(n) * 4 + 3] << 24))
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64 #define GET(n) \
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65 (ctx->block[(n)])
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66 #endif
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67
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68 /*
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69 * This processes one or more 64-byte data blocks, but does NOT update
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70 * the bit counters. There are no alignment requirements.
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71 */
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72 static void *body(MD5_CTX *ctx, void *data, unsigned long size)
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73 {
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74 unsigned char *ptr;
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75 MD5_u32plus a, b, c, d;
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76 MD5_u32plus saved_a, saved_b, saved_c, saved_d;
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77
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78 ptr = data;
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79
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80 a = ctx->a;
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81 b = ctx->b;
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82 c = ctx->c;
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83 d = ctx->d;
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84
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85 do {
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86 saved_a = a;
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87 saved_b = b;
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88 saved_c = c;
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89 saved_d = d;
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90
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91 /* Round 1 */
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92 STEP(F, a, b, c, d, SET(0), 0xd76aa478, 7)
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93 STEP(F, d, a, b, c, SET(1), 0xe8c7b756, 12)
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94 STEP(F, c, d, a, b, SET(2), 0x242070db, 17)
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95 STEP(F, b, c, d, a, SET(3), 0xc1bdceee, 22)
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96 STEP(F, a, b, c, d, SET(4), 0xf57c0faf, 7)
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97 STEP(F, d, a, b, c, SET(5), 0x4787c62a, 12)
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98 STEP(F, c, d, a, b, SET(6), 0xa8304613, 17)
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99 STEP(F, b, c, d, a, SET(7), 0xfd469501, 22)
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100 STEP(F, a, b, c, d, SET(8), 0x698098d8, 7)
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101 STEP(F, d, a, b, c, SET(9), 0x8b44f7af, 12)
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102 STEP(F, c, d, a, b, SET(10), 0xffff5bb1, 17)
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103 STEP(F, b, c, d, a, SET(11), 0x895cd7be, 22)
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104 STEP(F, a, b, c, d, SET(12), 0x6b901122, 7)
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105 STEP(F, d, a, b, c, SET(13), 0xfd987193, 12)
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106 STEP(F, c, d, a, b, SET(14), 0xa679438e, 17)
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107 STEP(F, b, c, d, a, SET(15), 0x49b40821, 22)
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108
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109 /* Round 2 */
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110 STEP(G, a, b, c, d, GET(1), 0xf61e2562, 5)
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111 STEP(G, d, a, b, c, GET(6), 0xc040b340, 9)
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112 STEP(G, c, d, a, b, GET(11), 0x265e5a51, 14)
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113 STEP(G, b, c, d, a, GET(0), 0xe9b6c7aa, 20)
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114 STEP(G, a, b, c, d, GET(5), 0xd62f105d, 5)
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115 STEP(G, d, a, b, c, GET(10), 0x02441453, 9)
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116 STEP(G, c, d, a, b, GET(15), 0xd8a1e681, 14)
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117 STEP(G, b, c, d, a, GET(4), 0xe7d3fbc8, 20)
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118 STEP(G, a, b, c, d, GET(9), 0x21e1cde6, 5)
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119 STEP(G, d, a, b, c, GET(14), 0xc33707d6, 9)
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120 STEP(G, c, d, a, b, GET(3), 0xf4d50d87, 14)
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121 STEP(G, b, c, d, a, GET(8), 0x455a14ed, 20)
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122 STEP(G, a, b, c, d, GET(13), 0xa9e3e905, 5)
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123 STEP(G, d, a, b, c, GET(2), 0xfcefa3f8, 9)
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124 STEP(G, c, d, a, b, GET(7), 0x676f02d9, 14)
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125 STEP(G, b, c, d, a, GET(12), 0x8d2a4c8a, 20)
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126
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127 /* Round 3 */
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128 STEP(H, a, b, c, d, GET(5), 0xfffa3942, 4)
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129 STEP(H, d, a, b, c, GET(8), 0x8771f681, 11)
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130 STEP(H, c, d, a, b, GET(11), 0x6d9d6122, 16)
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131 STEP(H, b, c, d, a, GET(14), 0xfde5380c, 23)
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132 STEP(H, a, b, c, d, GET(1), 0xa4beea44, 4)
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133 STEP(H, d, a, b, c, GET(4), 0x4bdecfa9, 11)
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134 STEP(H, c, d, a, b, GET(7), 0xf6bb4b60, 16)
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135 STEP(H, b, c, d, a, GET(10), 0xbebfbc70, 23)
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136 STEP(H, a, b, c, d, GET(13), 0x289b7ec6, 4)
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137 STEP(H, d, a, b, c, GET(0), 0xeaa127fa, 11)
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138 STEP(H, c, d, a, b, GET(3), 0xd4ef3085, 16)
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139 STEP(H, b, c, d, a, GET(6), 0x04881d05, 23)
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140 STEP(H, a, b, c, d, GET(9), 0xd9d4d039, 4)
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141 STEP(H, d, a, b, c, GET(12), 0xe6db99e5, 11)
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142 STEP(H, c, d, a, b, GET(15), 0x1fa27cf8, 16)
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143 STEP(H, b, c, d, a, GET(2), 0xc4ac5665, 23)
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144
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145 /* Round 4 */
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146 STEP(I, a, b, c, d, GET(0), 0xf4292244, 6)
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147 STEP(I, d, a, b, c, GET(7), 0x432aff97, 10)
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148 STEP(I, c, d, a, b, GET(14), 0xab9423a7, 15)
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149 STEP(I, b, c, d, a, GET(5), 0xfc93a039, 21)
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150 STEP(I, a, b, c, d, GET(12), 0x655b59c3, 6)
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151 STEP(I, d, a, b, c, GET(3), 0x8f0ccc92, 10)
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152 STEP(I, c, d, a, b, GET(10), 0xffeff47d, 15)
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153 STEP(I, b, c, d, a, GET(1), 0x85845dd1, 21)
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154 STEP(I, a, b, c, d, GET(8), 0x6fa87e4f, 6)
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155 STEP(I, d, a, b, c, GET(15), 0xfe2ce6e0, 10)
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156 STEP(I, c, d, a, b, GET(6), 0xa3014314, 15)
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157 STEP(I, b, c, d, a, GET(13), 0x4e0811a1, 21)
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158 STEP(I, a, b, c, d, GET(4), 0xf7537e82, 6)
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159 STEP(I, d, a, b, c, GET(11), 0xbd3af235, 10)
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160 STEP(I, c, d, a, b, GET(2), 0x2ad7d2bb, 15)
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161 STEP(I, b, c, d, a, GET(9), 0xeb86d391, 21)
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162
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163 a += saved_a;
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164 b += saved_b;
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165 c += saved_c;
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166 d += saved_d;
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167
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168 ptr += 64;
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169 } while (size -= 64);
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170
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171 ctx->a = a;
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172 ctx->b = b;
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173 ctx->c = c;
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174 ctx->d = d;
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175
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176 return ptr;
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177 }
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178
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179 void MD5_Init(MD5_CTX *ctx)
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180 {
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181 ctx->a = 0x67452301;
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182 ctx->b = 0xefcdab89;
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183 ctx->c = 0x98badcfe;
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184 ctx->d = 0x10325476;
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185
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186 ctx->lo = 0;
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187 ctx->hi = 0;
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188 }
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189
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190 void MD5_Update(MD5_CTX *ctx, void *data, unsigned long size)
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191 {
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192 MD5_u32plus saved_lo;
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193 unsigned long used, free;
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194
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195 saved_lo = ctx->lo;
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196 if ((ctx->lo = (saved_lo + size) & 0x1fffffff) < saved_lo)
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197 ctx->hi++;
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198 ctx->hi += size >> 29;
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199
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200 used = saved_lo & 0x3f;
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201
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202 if (used) {
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203 free = 64 - used;
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204
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205 if (size < free) {
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206 memcpy(&ctx->buffer[used], data, size);
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207 return;
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208 }
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209
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210 memcpy(&ctx->buffer[used], data, free);
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211 data = (unsigned char *)data + free;
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212 size -= free;
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213 body(ctx, ctx->buffer, 64);
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214 }
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215
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216 if (size >= 64) {
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217 data = body(ctx, data, size & ~(unsigned long)0x3f);
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218 size &= 0x3f;
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219 }
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220
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221 memcpy(ctx->buffer, data, size);
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222 }
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223
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224 void MD5_Final(unsigned char *result, MD5_CTX *ctx)
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225 {
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226 unsigned long used, free;
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227
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228 used = ctx->lo & 0x3f;
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229
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230 ctx->buffer[used++] = 0x80;
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231
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232 free = 64 - used;
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233
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234 if (free < 8) {
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235 memset(&ctx->buffer[used], 0, free);
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236 body(ctx, ctx->buffer, 64);
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237 used = 0;
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238 free = 64;
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239 }
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240
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241 memset(&ctx->buffer[used], 0, free - 8);
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242
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243 ctx->lo <<= 3;
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244 ctx->buffer[56] = ctx->lo;
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245 ctx->buffer[57] = ctx->lo >> 8;
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246 ctx->buffer[58] = ctx->lo >> 16;
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247 ctx->buffer[59] = ctx->lo >> 24;
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248 ctx->buffer[60] = ctx->hi;
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249 ctx->buffer[61] = ctx->hi >> 8;
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250 ctx->buffer[62] = ctx->hi >> 16;
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251 ctx->buffer[63] = ctx->hi >> 24;
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252
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253 body(ctx, ctx->buffer, 64);
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254
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255 result[0] = ctx->a;
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256 result[1] = ctx->a >> 8;
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257 result[2] = ctx->a >> 16;
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258 result[3] = ctx->a >> 24;
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259 result[4] = ctx->b;
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260 result[5] = ctx->b >> 8;
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261 result[6] = ctx->b >> 16;
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262 result[7] = ctx->b >> 24;
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263 result[8] = ctx->c;
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264 result[9] = ctx->c >> 8;
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265 result[10] = ctx->c >> 16;
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266 result[11] = ctx->c >> 24;
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267 result[12] = ctx->d;
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268 result[13] = ctx->d >> 8;
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269 result[14] = ctx->d >> 16;
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270 result[15] = ctx->d >> 24;
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271
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272 memset(ctx, 0, sizeof(*ctx));
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273 }
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274
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275 #endif