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annotate src/md5/md5c.c @ 201:138e66e1a61f

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removed dns_getname() which was already commented seems as if one can use dns_getip() or dns_getmx() instead without problem their code is almost identical to the one of dns_getname() anyway
author meillo@marmaro.de
date Fri, 16 Jul 2010 13:08:29 +0200 (2010-07-16)
parents 26e34ae9a3e3
children
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1 /* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
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2 */
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3
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4 /* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
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5 rights reserved.
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6
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7 License to copy and use this software is granted provided that it
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8 is identified as the "RSA Data Security, Inc. MD5 Message-Digest
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9 Algorithm" in all material mentioning or referencing this software
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10 or this function.
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11
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12 License is also granted to make and use derivative works provided
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13 that such works are identified as "derived from the RSA Data
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14 Security, Inc. MD5 Message-Digest Algorithm" in all material
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15 mentioning or referencing the derived work.
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16
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17 RSA Data Security, Inc. makes no representations concerning either
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18 the merchantability of this software or the suitability of this
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19 software for any particular purpose. It is provided "as is"
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20 without express or implied warranty of any kind.
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21
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22 These notices must be retained in any copies of any part of this
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23 documentation and/or software.
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24 */
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25
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26 #include "global.h"
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27 #include "md5.h"
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28
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29 /* Constants for MD5Transform routine.
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30 */
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31 #define S11 7
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32 #define S12 12
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33 #define S13 17
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34 #define S14 22
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35 #define S21 5
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36 #define S22 9
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37 #define S23 14
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38 #define S24 20
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39 #define S31 4
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40 #define S32 11
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41 #define S33 16
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42 #define S34 23
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43 #define S41 6
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44 #define S42 10
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45 #define S43 15
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46 #define S44 21
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47
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48 static void MD5Transform PROTO_LIST((UINT4[4], unsigned char[64]));
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49 static void Encode PROTO_LIST((unsigned char *, UINT4 *, unsigned int));
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50 static void Decode PROTO_LIST((UINT4 *, unsigned char *, unsigned int));
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51 static void MD5_memcpy PROTO_LIST((POINTER, POINTER, unsigned int));
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52 static void MD5_memset PROTO_LIST((POINTER, int, unsigned int));
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53
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54 static unsigned char PADDING[64] = {
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55 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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56 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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57 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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58 };
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59
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60 /* F, G, H and I are basic MD5 functions.
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61 */
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62 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
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63 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
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64 #define H(x, y, z) ((x) ^ (y) ^ (z))
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65 #define I(x, y, z) ((y) ^ ((x) | (~z)))
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66
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67 /* ROTATE_LEFT rotates x left n bits.
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68 */
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69 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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70
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71 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
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72 Rotation is separate from addition to prevent recomputation.
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73 */
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74 #define FF(a, b, c, d, x, s, ac) { \
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75 (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
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76 (a) = ROTATE_LEFT ((a), (s)); \
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77 (a) += (b); \
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78 }
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79 #define GG(a, b, c, d, x, s, ac) { \
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80 (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
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81 (a) = ROTATE_LEFT ((a), (s)); \
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82 (a) += (b); \
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83 }
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84 #define HH(a, b, c, d, x, s, ac) { \
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85 (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
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86 (a) = ROTATE_LEFT ((a), (s)); \
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87 (a) += (b); \
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88 }
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89 #define II(a, b, c, d, x, s, ac) { \
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90 (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
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91 (a) = ROTATE_LEFT ((a), (s)); \
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92 (a) += (b); \
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93 }
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94
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95 /* MD5 initialization. Begins an MD5 operation, writing a new context.
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96 */
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97 void
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98 MD5Init(context)
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99 MD5_CTX *context; /* context */
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100 {
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101 context->count[0] = context->count[1] = 0;
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102 /* Load magic initialization constants. */
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103 context->state[0] = 0x67452301;
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104 context->state[1] = 0xefcdab89;
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105 context->state[2] = 0x98badcfe;
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106 context->state[3] = 0x10325476;
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107 }
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108
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109 /* MD5 block update operation. Continues an MD5 message-digest
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110 operation, processing another message block, and updating the
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111 context.
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112 */
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113 void
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114 MD5Update(context, input, inputLen)
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115 MD5_CTX *context; /* context */
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116 unsigned char *input; /* input block */
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117 unsigned int inputLen; /* length of input block */
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118 {
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119 unsigned int i, index, partLen;
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120
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121 /* Compute number of bytes mod 64 */
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122 index = (unsigned int) ((context->count[0] >> 3) & 0x3F);
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123
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124 /* Update number of bits */
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125 if ((context->count[0] += ((UINT4) inputLen << 3)) < ((UINT4) inputLen << 3))
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126 context->count[1]++;
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127 context->count[1] += ((UINT4) inputLen >> 29);
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128
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129 partLen = 64 - index;
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130
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131 /* Transform as many times as possible.
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132 */
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133 if (inputLen >= partLen) {
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134 MD5_memcpy((POINTER) & context->buffer[index], (POINTER) input, partLen);
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135 MD5Transform(context->state, context->buffer);
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136
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137 for (i = partLen; i + 63 < inputLen; i += 64)
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138 MD5Transform(context->state, &input[i]);
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139
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140 index = 0;
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141 } else
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142 i = 0;
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143
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144 /* Buffer remaining input */
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145 MD5_memcpy((POINTER) & context->buffer[index], (POINTER) & input[i], inputLen - i);
0
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146 }
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147
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148 /* MD5 finalization. Ends an MD5 message-digest operation, writing the
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149 the message digest and zeroizing the context.
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150 */
10
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151 void
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152 MD5Final(digest, context)
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153 unsigned char digest[16]; /* message digest */
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154 MD5_CTX *context; /* context */
0
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155 {
10
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156 unsigned char bits[8];
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157 unsigned int index, padLen;
0
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158
10
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159 /* Save number of bits */
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160 Encode(bits, context->count, 8);
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161
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162 /* Pad out to 56 mod 64.
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163 */
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164 index = (unsigned int) ((context->count[0] >> 3) & 0x3f);
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165 padLen = (index < 56) ? (56 - index) : (120 - index);
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166 MD5Update(context, PADDING, padLen);
0
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167
10
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168 /* Append length (before padding) */
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169 MD5Update(context, bits, 8);
0
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170
10
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171 /* Store state in digest */
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172 Encode(digest, context->state, 16);
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173
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174 /* Zeroize sensitive information.
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175 */
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176 MD5_memset((POINTER) context, 0, sizeof(*context));
0
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177 }
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178
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179 /* MD5 basic transformation. Transforms state based on block.
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180 */
10
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181 static void
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182 MD5Transform(state, block)
0
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183 UINT4 state[4];
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184 unsigned char block[64];
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185 {
10
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186 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
0
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187
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188 Decode(x, block, 64);
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189
10
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190 /* Round 1 */
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191 FF(a, b, c, d, x[0], S11, 0xd76aa478); /* 1 */
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192 FF(d, a, b, c, x[1], S12, 0xe8c7b756); /* 2 */
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193 FF(c, d, a, b, x[2], S13, 0x242070db); /* 3 */
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194 FF(b, c, d, a, x[3], S14, 0xc1bdceee); /* 4 */
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195 FF(a, b, c, d, x[4], S11, 0xf57c0faf); /* 5 */
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196 FF(d, a, b, c, x[5], S12, 0x4787c62a); /* 6 */
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197 FF(c, d, a, b, x[6], S13, 0xa8304613); /* 7 */
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198 FF(b, c, d, a, x[7], S14, 0xfd469501); /* 8 */
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199 FF(a, b, c, d, x[8], S11, 0x698098d8); /* 9 */
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200 FF(d, a, b, c, x[9], S12, 0x8b44f7af); /* 10 */
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201 FF(c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
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202 FF(b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
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203 FF(a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
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204 FF(d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
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205 FF(c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
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206 FF(b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
0
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207
10
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208 /* Round 2 */
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209 GG(a, b, c, d, x[1], S21, 0xf61e2562); /* 17 */
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210 GG(d, a, b, c, x[6], S22, 0xc040b340); /* 18 */
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211 GG(c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
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212 GG(b, c, d, a, x[0], S24, 0xe9b6c7aa); /* 20 */
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213 GG(a, b, c, d, x[5], S21, 0xd62f105d); /* 21 */
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214 GG(d, a, b, c, x[10], S22, 0x2441453); /* 22 */
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215 GG(c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
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216 GG(b, c, d, a, x[4], S24, 0xe7d3fbc8); /* 24 */
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217 GG(a, b, c, d, x[9], S21, 0x21e1cde6); /* 25 */
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218 GG(d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
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219 GG(c, d, a, b, x[3], S23, 0xf4d50d87); /* 27 */
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220 GG(b, c, d, a, x[8], S24, 0x455a14ed); /* 28 */
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221 GG(a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
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222 GG(d, a, b, c, x[2], S22, 0xfcefa3f8); /* 30 */
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223 GG(c, d, a, b, x[7], S23, 0x676f02d9); /* 31 */
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224 GG(b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
0
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225
10
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226 /* Round 3 */
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227 HH(a, b, c, d, x[5], S31, 0xfffa3942); /* 33 */
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228 HH(d, a, b, c, x[8], S32, 0x8771f681); /* 34 */
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229 HH(c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
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230 HH(b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
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231 HH(a, b, c, d, x[1], S31, 0xa4beea44); /* 37 */
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232 HH(d, a, b, c, x[4], S32, 0x4bdecfa9); /* 38 */
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233 HH(c, d, a, b, x[7], S33, 0xf6bb4b60); /* 39 */
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234 HH(b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
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235 HH(a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
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236 HH(d, a, b, c, x[0], S32, 0xeaa127fa); /* 42 */
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237 HH(c, d, a, b, x[3], S33, 0xd4ef3085); /* 43 */
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238 HH(b, c, d, a, x[6], S34, 0x4881d05); /* 44 */
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239 HH(a, b, c, d, x[9], S31, 0xd9d4d039); /* 45 */
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240 HH(d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
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241 HH(c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
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242 HH(b, c, d, a, x[2], S34, 0xc4ac5665); /* 48 */
0
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243
10
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244 /* Round 4 */
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245 II(a, b, c, d, x[0], S41, 0xf4292244); /* 49 */
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246 II(d, a, b, c, x[7], S42, 0x432aff97); /* 50 */
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247 II(c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
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248 II(b, c, d, a, x[5], S44, 0xfc93a039); /* 52 */
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249 II(a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
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250 II(d, a, b, c, x[3], S42, 0x8f0ccc92); /* 54 */
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251 II(c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
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252 II(b, c, d, a, x[1], S44, 0x85845dd1); /* 56 */
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253 II(a, b, c, d, x[8], S41, 0x6fa87e4f); /* 57 */
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254 II(d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
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255 II(c, d, a, b, x[6], S43, 0xa3014314); /* 59 */
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256 II(b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
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257 II(a, b, c, d, x[4], S41, 0xf7537e82); /* 61 */
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258 II(d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
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259 II(c, d, a, b, x[2], S43, 0x2ad7d2bb); /* 63 */
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260 II(b, c, d, a, x[9], S44, 0xeb86d391); /* 64 */
0
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261
10
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262 state[0] += a;
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263 state[1] += b;
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264 state[2] += c;
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265 state[3] += d;
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266
10
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267 /* Zeroize sensitive information. */
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268 MD5_memset((POINTER) x, 0, sizeof(x));
0
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269 }
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270
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271 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
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272 a multiple of 4.
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273 */
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274 static void
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275 Encode(output, input, len)
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276 unsigned char *output;
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277 UINT4 *input;
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278 unsigned int len;
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279 {
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280 unsigned int i, j;
0
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281
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282 for (i = 0, j = 0; j < len; i++, j += 4) {
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283 output[j] = (unsigned char) (input[i] & 0xff);
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284 output[j + 1] = (unsigned char) ((input[i] >> 8) & 0xff);
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285 output[j + 2] = (unsigned char) ((input[i] >> 16) & 0xff);
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286 output[j + 3] = (unsigned char) ((input[i] >> 24) & 0xff);
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287 }
0
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288 }
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289
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290 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
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291 a multiple of 4.
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292 */
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293 static void
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294 Decode(output, input, len)
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295 UINT4 *output;
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296 unsigned char *input;
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297 unsigned int len;
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298 {
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299 unsigned int i, j;
0
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300
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301 for (i = 0, j = 0; j < len; i++, j += 4)
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302 output[i] = ((UINT4) input[j]) | (((UINT4) input[j + 1]) << 8) | (((UINT4) input[j + 2]) << 16) | (((UINT4) input[j + 3]) << 24);
0
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303 }
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304
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305 /* Note: Replace "for loop" with standard memcpy if possible.
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306 */
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307
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308 static void
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309 MD5_memcpy(output, input, len)
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310 POINTER output;
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311 POINTER input;
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312 unsigned int len;
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313 {
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314 unsigned int i;
0
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315
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316 for (i = 0; i < len; i++)
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317 output[i] = input[i];
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318 }
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319
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320 /* Note: Replace "for loop" with standard memset if possible.
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321 */
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322 static void
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323 MD5_memset(output, value, len)
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324 POINTER output;
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325 int value;
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326 unsigned int len;
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327 {
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328 unsigned int i;
0
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329
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330 for (i = 0; i < len; i++)
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331 ((char *) output)[i] = (char) value;
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332 }