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 |
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50 | ((unsigned char *, UINT4 *, unsigned int)); |
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51 | static void Decode PROTO_LIST |
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52 | ((UINT4 *, unsigned char *, unsigned int)); |
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53 | static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int)); |
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54 | static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int)); |
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55 | |
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56 | static unsigned char PADDING[64] = { |
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57 | 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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58 | 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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59 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 |
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60 | }; |
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61 | |
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62 | /* F, G, H and I are basic MD5 functions. |
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63 | */ |
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64 | #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) |
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65 | #define G(x, y, z) (((x) & (z)) | ((y) & (~z))) |
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66 | #define H(x, y, z) ((x) ^ (y) ^ (z)) |
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67 | #define I(x, y, z) ((y) ^ ((x) | (~z))) |
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68 | |
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69 | /* ROTATE_LEFT rotates x left n bits. |
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70 | */ |
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71 | #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) |
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72 | |
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73 | /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. |
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74 | Rotation is separate from addition to prevent recomputation. |
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75 | */ |
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76 | #define FF(a, b, c, d, x, s, ac) { \ |
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77 | (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \ |
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78 | (a) = ROTATE_LEFT ((a), (s)); \ |
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79 | (a) += (b); \ |
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80 | } |
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81 | #define GG(a, b, c, d, x, s, ac) { \ |
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82 | (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \ |
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83 | (a) = ROTATE_LEFT ((a), (s)); \ |
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84 | (a) += (b); \ |
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85 | } |
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86 | #define HH(a, b, c, d, x, s, ac) { \ |
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87 | (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \ |
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88 | (a) = ROTATE_LEFT ((a), (s)); \ |
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89 | (a) += (b); \ |
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90 | } |
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91 | #define II(a, b, c, d, x, s, ac) { \ |
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92 | (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \ |
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93 | (a) = ROTATE_LEFT ((a), (s)); \ |
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94 | (a) += (b); \ |
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95 | } |
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96 | |
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97 | /* MD5 initialization. Begins an MD5 operation, writing a new context. |
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98 | */ |
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99 | void MD5Init (context) |
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100 | MD5_CTX *context; /* context */ |
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101 | { |
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102 | context->count[0] = context->count[1] = 0; |
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103 | |
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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 | static void MD5_memcpy (output, input, len) |
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313 | POINTER output; |
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314 | POINTER input; |
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315 | unsigned int len; |
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316 | { |
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317 | unsigned int i; |
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318 | |
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319 | for (i = 0; i < len; i++) |
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320 | output[i] = input[i]; |
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321 | } |
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322 | |
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323 | /* Note: Replace "for loop" with standard memset if possible. |
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324 | */ |
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325 | static void MD5_memset (output, value, len) |
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326 | POINTER output; |
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327 | int value; |
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328 | unsigned int len; |
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329 | { |
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330 | unsigned int i; |
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331 | |
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332 | for (i = 0; i < len; i++) |
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333 | ((char *)output)[i] = (char)value; |
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334 | } |
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