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337
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1 /*
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2 **********************************************************************
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3 ** md5.c **
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4 ** RSA Data Security, Inc. MD5 Message Digest Algorithm **
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5 ** Created: 2/17/90 RLR **
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6 ** Revised: 1/91 SRD,AJ,BSK,JT Reference C Version **
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7 **********************************************************************
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8 */
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9
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10 /*
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11 **********************************************************************
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12 ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved. **
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13 ** **
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14 ** License to copy and use this software is granted provided that **
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15 ** it is identified as the "RSA Data Security, Inc. MD5 Message **
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16 ** Digest Algorithm" in all material mentioning or referencing this **
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17 ** software or this function. **
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18 ** **
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19 ** License is also granted to make and use derivative works **
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20 ** provided that such works are identified as "derived from the RSA **
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21 ** Data Security, Inc. MD5 Message Digest Algorithm" in all **
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22 ** material mentioning or referencing the derived work. **
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23 ** **
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24 ** RSA Data Security, Inc. makes no representations concerning **
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25 ** either the merchantability of this software or the suitability **
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26 ** of this software for any particular purpose. It is provided "as **
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27 ** is" without express or implied warranty of any kind. **
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28 ** **
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29 ** These notices must be retained in any copies of any part of this **
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30 ** documentation and/or software. **
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31 **********************************************************************
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32 */
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33
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34 /* -- include the following line if the md5.h header file is separate -- */
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35 #include "md5.h"
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36
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37 /* forward declaration */
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38 static void Transform (UINT4 *buf, UINT4 *in);
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39
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40 static unsigned char PADDING[64] = {
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41 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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42 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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43 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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44 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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45 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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46 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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47 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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48 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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49 };
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50
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51 /* F, G and H are basic MD5 functions: selection, majority, parity */
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52 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
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53 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
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54 #define H(x, y, z) ((x) ^ (y) ^ (z))
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55 #define I(x, y, z) ((y) ^ ((x) | (~z)))
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56
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57 /* ROTATE_LEFT rotates x left n bits */
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58 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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59
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60 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */
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61 /* Rotation is separate from addition to prevent recomputation */
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62 #define FF(a, b, c, d, x, s, ac) \
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63 {(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
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64 (a) = ROTATE_LEFT ((a), (s)); \
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65 (a) += (b); \
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66 }
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67 #define GG(a, b, c, d, x, s, ac) \
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68 {(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
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69 (a) = ROTATE_LEFT ((a), (s)); \
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70 (a) += (b); \
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71 }
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72 #define HH(a, b, c, d, x, s, ac) \
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73 {(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
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74 (a) = ROTATE_LEFT ((a), (s)); \
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75 (a) += (b); \
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76 }
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77 #define II(a, b, c, d, x, s, ac) \
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78 {(a) += I ((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
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83 void MD5Init (mdContext)
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84 MD5_CTX *mdContext;
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85 {
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86 mdContext->i[0] = mdContext->i[1] = (UINT4)0;
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87
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88 /* Load magic initialization constants.
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89 */
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90 mdContext->buf[0] = (UINT4)0x67452301;
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91 mdContext->buf[1] = (UINT4)0xefcdab89;
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92 mdContext->buf[2] = (UINT4)0x98badcfe;
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93 mdContext->buf[3] = (UINT4)0x10325476;
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94 }
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95
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96 void MD5Update (mdContext, inBuf, inLen)
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97 MD5_CTX *mdContext;
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98 unsigned char *inBuf;
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99 unsigned int inLen;
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100 {
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101 UINT4 in[16];
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102 int mdi;
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103 unsigned int i, ii;
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104
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105 /* compute number of bytes mod 64 */
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106 mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
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107
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108 /* update number of bits */
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109 if ((mdContext->i[0] + ((UINT4)inLen << 3)) < mdContext->i[0])
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110 mdContext->i[1]++;
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111 mdContext->i[0] += ((UINT4)inLen << 3);
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112 mdContext->i[1] += ((UINT4)inLen >> 29);
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113
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114 while (inLen--) {
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115 /* add new character to buffer, increment mdi */
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116 mdContext->in[mdi++] = *inBuf++;
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117
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118 /* transform if necessary */
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119 if (mdi == 0x40) {
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120 for (i = 0, ii = 0; i < 16; i++, ii += 4)
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121 in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
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122 (((UINT4)mdContext->in[ii+2]) << 16) |
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123 (((UINT4)mdContext->in[ii+1]) << 8) |
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124 ((UINT4)mdContext->in[ii]);
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125 Transform (mdContext->buf, in);
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126 mdi = 0;
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127 }
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128 }
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129 }
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130
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131 void MD5Final (mdContext)
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132 MD5_CTX *mdContext;
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133 {
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134 UINT4 in[16];
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135 int mdi;
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136 unsigned int i, ii;
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137 unsigned int padLen;
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138
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139 /* save number of bits */
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140 in[14] = mdContext->i[0];
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141 in[15] = mdContext->i[1];
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142
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143 /* compute number of bytes mod 64 */
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144 mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
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145
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146 /* pad out to 56 mod 64 */
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147 padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
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148 MD5Update (mdContext, PADDING, padLen);
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149
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150 /* append length in bits and transform */
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151 for (i = 0, ii = 0; i < 14; i++, ii += 4)
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152 in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
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153 (((UINT4)mdContext->in[ii+2]) << 16) |
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154 (((UINT4)mdContext->in[ii+1]) << 8) |
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155 ((UINT4)mdContext->in[ii]);
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156 Transform (mdContext->buf, in);
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157
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158 /* store buffer in digest */
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159 for (i = 0, ii = 0; i < 4; i++, ii += 4) {
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160 mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF);
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161 mdContext->digest[ii+1] =
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162 (unsigned char)((mdContext->buf[i] >> 8) & 0xFF);
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163 mdContext->digest[ii+2] =
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164 (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
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165 mdContext->digest[ii+3] =
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166 (unsigned char)((mdContext->buf[i] >> 24) & 0xFF);
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167 }
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168 }
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169
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170 /* Basic MD5 step. Transform buf based on in.
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171 */
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172 static void Transform (buf, in)
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173 UINT4 *buf;
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174 UINT4 *in;
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175 {
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176 UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3];
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177
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178 /* Round 1 */
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179 #define S11 7
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180 #define S12 12
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181 #define S13 17
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182 #define S14 22
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183 FF ( a, b, c, d, in[ 0], S11, 3614090360); /* 1 */
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184 FF ( d, a, b, c, in[ 1], S12, 3905402710); /* 2 */
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185 FF ( c, d, a, b, in[ 2], S13, 606105819); /* 3 */
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186 FF ( b, c, d, a, in[ 3], S14, 3250441966); /* 4 */
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187 FF ( a, b, c, d, in[ 4], S11, 4118548399); /* 5 */
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188 FF ( d, a, b, c, in[ 5], S12, 1200080426); /* 6 */
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189 FF ( c, d, a, b, in[ 6], S13, 2821735955); /* 7 */
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190 FF ( b, c, d, a, in[ 7], S14, 4249261313); /* 8 */
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191 FF ( a, b, c, d, in[ 8], S11, 1770035416); /* 9 */
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192 FF ( d, a, b, c, in[ 9], S12, 2336552879); /* 10 */
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193 FF ( c, d, a, b, in[10], S13, 4294925233); /* 11 */
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194 FF ( b, c, d, a, in[11], S14, 2304563134); /* 12 */
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195 FF ( a, b, c, d, in[12], S11, 1804603682); /* 13 */
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196 FF ( d, a, b, c, in[13], S12, 4254626195); /* 14 */
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197 FF ( c, d, a, b, in[14], S13, 2792965006); /* 15 */
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198 FF ( b, c, d, a, in[15], S14, 1236535329); /* 16 */
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199
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200 /* Round 2 */
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201 #define S21 5
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202 #define S22 9
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203 #define S23 14
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204 #define S24 20
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205 GG ( a, b, c, d, in[ 1], S21, 4129170786); /* 17 */
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206 GG ( d, a, b, c, in[ 6], S22, 3225465664); /* 18 */
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207 GG ( c, d, a, b, in[11], S23, 643717713); /* 19 */
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208 GG ( b, c, d, a, in[ 0], S24, 3921069994); /* 20 */
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209 GG ( a, b, c, d, in[ 5], S21, 3593408605); /* 21 */
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210 GG ( d, a, b, c, in[10], S22, 38016083); /* 22 */
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211 GG ( c, d, a, b, in[15], S23, 3634488961); /* 23 */
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212 GG ( b, c, d, a, in[ 4], S24, 3889429448); /* 24 */
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213 GG ( a, b, c, d, in[ 9], S21, 568446438); /* 25 */
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214 GG ( d, a, b, c, in[14], S22, 3275163606); /* 26 */
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215 GG ( c, d, a, b, in[ 3], S23, 4107603335); /* 27 */
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216 GG ( b, c, d, a, in[ 8], S24, 1163531501); /* 28 */
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217 GG ( a, b, c, d, in[13], S21, 2850285829); /* 29 */
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218 GG ( d, a, b, c, in[ 2], S22, 4243563512); /* 30 */
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219 GG ( c, d, a, b, in[ 7], S23, 1735328473); /* 31 */
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220 GG ( b, c, d, a, in[12], S24, 2368359562); /* 32 */
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221
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222 /* Round 3 */
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223 #define S31 4
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224 #define S32 11
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225 #define S33 16
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226 #define S34 23
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227 HH ( a, b, c, d, in[ 5], S31, 4294588738); /* 33 */
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228 HH ( d, a, b, c, in[ 8], S32, 2272392833); /* 34 */
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229 HH ( c, d, a, b, in[11], S33, 1839030562); /* 35 */
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230 HH ( b, c, d, a, in[14], S34, 4259657740); /* 36 */
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231 HH ( a, b, c, d, in[ 1], S31, 2763975236); /* 37 */
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232 HH ( d, a, b, c, in[ 4], S32, 1272893353); /* 38 */
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233 HH ( c, d, a, b, in[ 7], S33, 4139469664); /* 39 */
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234 HH ( b, c, d, a, in[10], S34, 3200236656); /* 40 */
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235 HH ( a, b, c, d, in[13], S31, 681279174); /* 41 */
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236 HH ( d, a, b, c, in[ 0], S32, 3936430074); /* 42 */
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237 HH ( c, d, a, b, in[ 3], S33, 3572445317); /* 43 */
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238 HH ( b, c, d, a, in[ 6], S34, 76029189); /* 44 */
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239 HH ( a, b, c, d, in[ 9], S31, 3654602809); /* 45 */
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240 HH ( d, a, b, c, in[12], S32, 3873151461); /* 46 */
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241 HH ( c, d, a, b, in[15], S33, 530742520); /* 47 */
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242 HH ( b, c, d, a, in[ 2], S34, 3299628645); /* 48 */
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243
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244 /* Round 4 */
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245 #define S41 6
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246 #define S42 10
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247 #define S43 15
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248 #define S44 21
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249 II ( a, b, c, d, in[ 0], S41, 4096336452); /* 49 */
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250 II ( d, a, b, c, in[ 7], S42, 1126891415); /* 50 */
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251 II ( c, d, a, b, in[14], S43, 2878612391); /* 51 */
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252 II ( b, c, d, a, in[ 5], S44, 4237533241); /* 52 */
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253 II ( a, b, c, d, in[12], S41, 1700485571); /* 53 */
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254 II ( d, a, b, c, in[ 3], S42, 2399980690); /* 54 */
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255 II ( c, d, a, b, in[10], S43, 4293915773); /* 55 */
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256 II ( b, c, d, a, in[ 1], S44, 2240044497); /* 56 */
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257 II ( a, b, c, d, in[ 8], S41, 1873313359); /* 57 */
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258 II ( d, a, b, c, in[15], S42, 4264355552); /* 58 */
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259 II ( c, d, a, b, in[ 6], S43, 2734768916); /* 59 */
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260 II ( b, c, d, a, in[13], S44, 1309151649); /* 60 */
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261 II ( a, b, c, d, in[ 4], S41, 4149444226); /* 61 */
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262 II ( d, a, b, c, in[11], S42, 3174756917); /* 62 */
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263 II ( c, d, a, b, in[ 2], S43, 718787259); /* 63 */
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264 II ( b, c, d, a, in[ 9], S44, 3951481745); /* 64 */
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265
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266 buf[0] += a;
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267 buf[1] += b;
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268 buf[2] += c;
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269 buf[3] += d;
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270 }
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271
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272 /*
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273 **********************************************************************
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274 ** End of md5.c **
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275 ******************************* (cut) ********************************
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276 */
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277
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