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annotate Modules/md5c.c @ 4566:6403c94de50d legacy-trunk

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Added safeguard against failure in __del__.
author Guido van Rossum <guido@python.org>
date Wed, 27 Nov 1996 19:39:58 +0000
parents d6c7e40cbfdf
children 8424ec4c4bb2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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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 "config.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
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32 #define S11 7
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33 #define S12 12
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34 #define S13 17
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35 #define S14 22
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36 #define S21 5
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37 #define S22 9
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38 #define S23 14
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39 #define S24 20
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40 #define S31 4
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41 #define S32 11
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42 #define S33 16
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43 #define S34 23
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44 #define S41 6
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45 #define S42 10
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46 #define S43 15
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47 #define S44 21
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48
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49 static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64]));
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50 static void Encode PROTO_LIST
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51 ((unsigned char *, UINT4 *, unsigned int));
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52 static void Decode PROTO_LIST
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53 ((UINT4 *, unsigned char *, unsigned int));
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54 static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
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55 static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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56
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57 static unsigned char PADDING[64] = {
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58 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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59 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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60 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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61 };
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62
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63 /* F, G, H and I are basic MD5 functions.
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64 */
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65 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
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66 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
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67 #define H(x, y, z) ((x) ^ (y) ^ (z))
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68 #define I(x, y, z) ((y) ^ ((x) | (~z)))
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69
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70 /* ROTATE_LEFT rotates x left n bits.
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71 */
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72 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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73
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74 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
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75 Rotation is separate from addition to prevent recomputation.
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76 */
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77 #define FF(a, b, c, d, x, s, ac) { \
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78 (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
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79 (a) = ROTATE_LEFT ((a), (s)); \
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80 (a) += (b); \
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81 }
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82 #define GG(a, b, c, d, x, s, ac) { \
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83 (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
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84 (a) = ROTATE_LEFT ((a), (s)); \
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85 (a) += (b); \
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86 }
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87 #define HH(a, b, c, d, x, s, ac) { \
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88 (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
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89 (a) = ROTATE_LEFT ((a), (s)); \
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90 (a) += (b); \
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91 }
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92 #define II(a, b, c, d, x, s, ac) { \
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93 (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
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94 (a) = ROTATE_LEFT ((a), (s)); \
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95 (a) += (b); \
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96 }
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97
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98 /* MD5 initialization. Begins an MD5 operation, writing a new context.
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99 */
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100 void MD5Init (context)
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101 MD5_CTX *context; /* context */
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102 {
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103 context->count[0] = context->count[1] = 0;
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104 /* Load magic initialization constants.
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105 */
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106 context->state[0] = 0x67452301;
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107 context->state[1] = 0xefcdab89;
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108 context->state[2] = 0x98badcfe;
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109 context->state[3] = 0x10325476;
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110 }
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111
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112 /* MD5 block update operation. Continues an MD5 message-digest
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113 operation, processing another message block, and updating the
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114 context.
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115 */
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116 void MD5Update (context, input, inputLen)
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117 MD5_CTX *context; /* context */
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118 unsigned char *input; /* input block */
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119 unsigned int inputLen; /* length of input block */
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120 {
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121 unsigned int i, index, partLen;
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122
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123 /* Compute number of bytes mod 64 */
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124 index = (unsigned int)((context->count[0] >> 3) & 0x3F);
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125
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126 /* Update number of bits */
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127 if ((context->count[0] += ((UINT4)inputLen << 3))
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128 < ((UINT4)inputLen << 3))
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129 context->count[1]++;
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130 context->count[1] += ((UINT4)inputLen >> 29);
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131
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132 partLen = 64 - index;
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133
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134 /* Transform as many times as possible.
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135 */
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136 if (inputLen >= partLen) {
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137 MD5_memcpy
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138 ((POINTER)&context->buffer[index], (POINTER)input, partLen);
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139 MD5Transform (context->state, context->buffer);
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140
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141 for (i = partLen; i + 63 < inputLen; i += 64)
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142 MD5Transform (context->state, &input[i]);
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143
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144 index = 0;
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145 }
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146 else
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147 i = 0;
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148
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149 /* Buffer remaining input */
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150 MD5_memcpy
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151 ((POINTER)&context->buffer[index], (POINTER)&input[i],
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152 inputLen-i);
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153 }
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154
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155 /* MD5 finalization. Ends an MD5 message-digest operation, writing the
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156 the message digest and zeroizing the context.
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157 */
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158 void MD5Final (digest, context)
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159 unsigned char digest[16]; /* message digest */
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160 MD5_CTX *context; /* context */
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161 {
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162 unsigned char bits[8];
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163 unsigned int index, padLen;
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164
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165 /* Save number of bits */
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166 Encode (bits, context->count, 8);
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167
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168 /* Pad out to 56 mod 64.
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169 */
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170 index = (unsigned int)((context->count[0] >> 3) & 0x3f);
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171 padLen = (index < 56) ? (56 - index) : (120 - index);
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172 MD5Update (context, PADDING, padLen);
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173
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174 /* Append length (before padding) */
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175 MD5Update (context, bits, 8);
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176
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177 /* Store state in digest */
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178 Encode (digest, context->state, 16);
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179
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180 /* Zeroize sensitive information.
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181 */
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182 MD5_memset ((POINTER)context, 0, sizeof (*context));
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183 }
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184
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185 /* MD5 basic transformation. Transforms state based on block.
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186 */
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187 static void MD5Transform (state, block)
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188 UINT4 state[4];
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189 unsigned char block[64];
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190 {
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191 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
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192
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193 Decode (x, block, 64);
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194
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195 /* Round 1 */
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196 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
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197 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
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198 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
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199 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
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200 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
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201 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
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202 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
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203 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
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204 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
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205 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
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206 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
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207 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
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208 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
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209 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
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210 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
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211 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
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212
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213 /* Round 2 */
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214 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
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215 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
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216 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
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217 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
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218 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
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219 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
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220 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
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221 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
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222 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
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223 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
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224 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
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225 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
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226 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
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227 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
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228 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
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229 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
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230
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231 /* Round 3 */
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232 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
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233 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
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234 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
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235 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
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236 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
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237 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
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238 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
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239 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
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240 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
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241 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
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242 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
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243 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
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244 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
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245 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
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246 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
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247 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
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248
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249 /* Round 4 */
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250 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
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251 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
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252 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
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253 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
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254 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
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255 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
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256 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
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257 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
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258 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
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259 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
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260 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
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261 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
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262 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
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263 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
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264 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
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265 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
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266
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267 state[0] += a;
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268 state[1] += b;
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269 state[2] += c;
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270 state[3] += d;
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271
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272 /* Zeroize sensitive information.
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273 */
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274 MD5_memset ((POINTER)x, 0, sizeof (x));
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275 }
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276
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277 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
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278 a multiple of 4.
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279 */
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280 static void Encode (output, input, len)
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281 unsigned char *output;
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282 UINT4 *input;
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283 unsigned int len;
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284 {
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285 unsigned int i, j;
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286
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287 for (i = 0, j = 0; j < len; i++, j += 4) {
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288 output[j] = (unsigned char)(input[i] & 0xff);
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289 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
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290 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
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291 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
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292 }
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293 }
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294
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295 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
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296 a multiple of 4.
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297 */
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298 static void Decode (output, input, len)
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299 UINT4 *output;
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300 unsigned char *input;
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301 unsigned int len;
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302 {
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303 unsigned int i, j;
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304
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305 for (i = 0, j = 0; j < len; i++, j += 4)
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306 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
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307 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
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308 }
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309
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310 /* Note: Replace "for loop" with standard memcpy if possible.
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311 */
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312
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313 static void MD5_memcpy (output, input, len)
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314 POINTER output;
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315 POINTER input;
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316 unsigned int len;
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317 {
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318 unsigned int i;
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319
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320 for (i = 0; i < len; i++)
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321 output[i] = input[i];
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322 }
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323
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324 /* Note: Replace "for loop" with standard memset if possible.
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325 */
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326 static void MD5_memset (output, value, len)
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327 POINTER output;
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328 int value;
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329 unsigned int len;
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330 {
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331 unsigned int i;
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332
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333 for (i = 0; i < len; i++)
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334 ((char *)output)[i] = (char)value;
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335 }