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0
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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 /* Synched up with: Not in FSF. */
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27 /* This file has been Mule-ized. See comment at Fmd5(), though. */
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28
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29 #include <config.h>
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30 #include "lisp.h"
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31
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32 #include "buffer.h"
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33 #include "insdel.h"
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34
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35 typedef unsigned char *POINTER;/* POINTER defines a generic pointer type */
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36 typedef unsigned short int UINT2;/* UINT2 defines a two byte word */
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70
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37 typedef unsigned long int UINT4;/* UINT4 defines a four byte word */
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0
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38
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39 #define PROTO_LIST(list) list
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40 #define MD_CTX MD5_CTX
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41 #define MDInit MD5Init
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42 #define MDUpdate MD5Update
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43 #define MDFinal MD5Final
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44
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45 /* MD5 context. */
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46 typedef struct {
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47 UINT4 state[4]; /* state (ABCD) */
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48 UINT4 count[2]; /* number of bits, modulo 2^64 (lsb first) */
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49 unsigned char buffer[64]; /* input buffer */
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50 } MD5_CTX;
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51
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52 void MD5Init PROTO_LIST ((MD5_CTX *));
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53 void MD5Update PROTO_LIST
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54 ((MD5_CTX *, CONST unsigned char *, unsigned int));
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55 void MD5Final PROTO_LIST ((unsigned char [16], MD5_CTX *));
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56
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57 /* Constants for MD5Transform routine.
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58 */
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59 #define S11 7
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60 #define S12 12
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61 #define S13 17
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62 #define S14 22
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63 #define S21 5
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64 #define S22 9
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65 #define S23 14
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66 #define S24 20
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67 #define S31 4
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68 #define S32 11
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69 #define S33 16
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70 #define S34 23
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71 #define S41 6
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72 #define S42 10
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73 #define S43 15
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74 #define S44 21
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75
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76 static void MD5Transform PROTO_LIST ((UINT4 [4], CONST unsigned char [64]));
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77 static void Encode PROTO_LIST
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78 ((unsigned char *, UINT4 *, unsigned int));
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79 static void Decode PROTO_LIST
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80 ((UINT4 *, CONST unsigned char *, unsigned int));
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81 static void MD5_memcpy PROTO_LIST ((POINTER, CONST POINTER, unsigned int));
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82 static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int));
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83
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84 static unsigned char PADDING[64] = {
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85 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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86 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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87 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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88 };
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89
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90 /* F, G, H and I are basic MD5 functions.
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91 */
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92 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
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93 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
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94 #define H(x, y, z) ((x) ^ (y) ^ (z))
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95 #define I(x, y, z) ((y) ^ ((x) | (~z)))
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96
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97 /* ROTATE_LEFT rotates x left n bits.
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98 */
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99 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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100
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101 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
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102 Rotation is separate from addition to prevent recomputation.
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103 */
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104 #define FF(a, b, c, d, x, s, ac) { \
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105 (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
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106 (a) = ROTATE_LEFT ((a), (s)); \
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107 (a) += (b); \
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108 }
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109 #define GG(a, b, c, d, x, s, ac) { \
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110 (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
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111 (a) = ROTATE_LEFT ((a), (s)); \
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112 (a) += (b); \
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113 }
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114 #define HH(a, b, c, d, x, s, ac) { \
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115 (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
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116 (a) = ROTATE_LEFT ((a), (s)); \
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117 (a) += (b); \
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118 }
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119 #define II(a, b, c, d, x, s, ac) { \
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120 (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
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121 (a) = ROTATE_LEFT ((a), (s)); \
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122 (a) += (b); \
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123 }
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124
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125 /* MD5 initialization. Begins an MD5 operation, writing a new context.
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126 */
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127 void
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128 MD5Init (MD5_CTX *context)
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129 {
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130 context->count[0] = context->count[1] = 0;
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131
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132 /* Load magic initialization constants. */
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133 context->state[0] = 0x67452301;
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134 context->state[1] = 0xefcdab89;
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135 context->state[2] = 0x98badcfe;
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136 context->state[3] = 0x10325476;
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137 }
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138
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139 /* MD5 block update operation. Continues an MD5 message-digest
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140 operation, processing another message block, and updating the
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141 context.
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142 */
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143 void
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144 MD5Update (MD5_CTX *context, CONST unsigned char *input, unsigned int inputLen)
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145 {
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146 unsigned int i, indecks, partLen;
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147
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148 /* Compute number of bytes mod 64 */
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149 indecks = (unsigned int)((context->count[0] >> 3) & 0x3F);
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150
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151 /* Update number of bits */
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152 if ((context->count[0] += ((UINT4)inputLen << 3))
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153 < ((UINT4)inputLen << 3))
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154 context->count[1]++;
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155 context->count[1] += ((UINT4)inputLen >> 29);
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156
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157 partLen = 64 - indecks;
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158
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159 /* Transform as many times as possible. */
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160 if (inputLen >= partLen)
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161 {
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162 MD5_memcpy ((POINTER)&context->buffer[indecks], (CONST POINTER)input,
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163 partLen);
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164 MD5Transform (context->state, context->buffer);
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165
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166 for (i = partLen; i + 63 < inputLen; i += 64)
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167 MD5Transform (context->state, &input[i]);
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168
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169 indecks = 0;
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170 }
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171 else
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172 i = 0;
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173
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174 /* Buffer remaining input */
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175 MD5_memcpy ((POINTER)&context->buffer[indecks], (CONST POINTER)&input[i],
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176 inputLen-i);
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177 }
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178
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179 /* MD5 finalization. Ends an MD5 message-digest operation, writing the
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180 message digest and zeroizing the context. */
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181 void
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182 MD5Final (unsigned char digest[16], MD5_CTX *context)
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183 {
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184 unsigned char bits[8];
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185 unsigned int indecks, padLen;
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186
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187 /* Save number of bits */
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188 Encode (bits, context->count, 8);
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189
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190 /* Pad out to 56 mod 64.
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191 */
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192 indecks = (unsigned int)((context->count[0] >> 3) & 0x3f);
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193 padLen = (indecks < 56) ? (56 - indecks) : (120 - indecks);
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194 MD5Update (context, PADDING, padLen);
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195
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196 /* Append length (before padding) */
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197 MD5Update (context, bits, 8);
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198 /* Store state in digest */
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199 Encode (digest, context->state, 16);
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200
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201 /* Zeroize sensitive information.
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202 */
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203 MD5_memset ((POINTER)context, 0, sizeof (*context));
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204 }
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205
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206 /* MD5 basic transformation. Transforms state based on block.
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207 */
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208 static void
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209 MD5Transform (UINT4 state[4], CONST unsigned char block[64])
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210 {
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211 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
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212
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213 Decode (x, block, 64);
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214
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215 /* Round 1 */
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216 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
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217 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
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218 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
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219 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
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220 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
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221 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
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222 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
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223 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
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224 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
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225 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
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226 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
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227 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
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228 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
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229 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
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230 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
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231 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
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232
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233 /* Round 2 */
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234 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
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235 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
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236 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
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237 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
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238 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
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239 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
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240 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
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241 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
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242 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
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243 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
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244 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
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245 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
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246 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
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247 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
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248 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
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249 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
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250
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251 /* Round 3 */
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252 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
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253 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
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254 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
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255 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
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256 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
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257 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
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258 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
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259 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
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260 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
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261 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
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262 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
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263 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
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264 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
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265 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
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266 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
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267 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
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268
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269 /* Round 4 */
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270 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
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271 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
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272 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
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273 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
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274 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
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275 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
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276 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
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277 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
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278 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
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279 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
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280 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
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281 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
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282 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
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283 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
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284 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
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285 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
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286
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287 state[0] += a;
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288 state[1] += b;
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289 state[2] += c;
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290 state[3] += d;
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291
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292 /* Zeroize sensitive information.
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293 */
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294 MD5_memset ((POINTER)x, 0, sizeof (x));
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295 }
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296
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297 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
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298 a multiple of 4.
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299 */
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300 static void
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301 Encode (unsigned char *output, UINT4 *input, 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 {
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307 output[j] = (unsigned char)(input[i] & 0xff);
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308 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
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309 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
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310 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
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311 }
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312 }
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313
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314 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
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315 a multiple of 4.
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316 */
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317 static void
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318 Decode (UINT4 *output, CONST unsigned char *input, unsigned int len)
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319 {
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320 unsigned int i, j;
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321
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322 for (i = 0, j = 0; j < len; i++, j += 4)
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323 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
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324 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
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325 }
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326
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327 static void
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328 MD5_memcpy (POINTER output, CONST POINTER input, unsigned int len)
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329 {
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330 memcpy (output, input, len);
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331 }
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332
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333 static void
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334 MD5_memset (POINTER output, int value, unsigned int len)
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335 {
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336 memset (output, value, len);
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337 }
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338
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339 /* unused */
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340 #if 0
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341 static void
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342 LispMDString (char *string)
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343 {
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344 MD_CTX context;
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345 unsigned char digest[16];
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346 unsigned int len = strlen(string);
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347
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348 MDInit (&context);
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349 MDUpdate (&context, string, len);
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350 MDFinal (digest, &context);
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351 }
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352 #endif
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353
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354
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355 /* XEmacs interface code. */
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356 Lisp_Object Qmd5;
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357
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358 /* #### There could be potential problems here with Mule. I don't
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359 know enough about the uses of MD5 to be able to tell for sure
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360 whether this is a problem. The basic potential problem is that
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361 the hash value will be computed based on the internal representation
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362 of the buffer; this would likely cause problems if the string
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363 contains extended characters, because the extended characters
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364 will get sent over the wire in an external form that is different
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365 from their internal representation, and thus their MD5 hash would
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366 be different. */
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367
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20
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368 DEFUN ("md5", Fmd5, 1, 3, 0, /*
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0
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369 Return the MD5 (a secure message digest algorithm) of an object.
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370 OBJECT is either a string or a buffer.
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371 Optional arguments START and END denote buffer positions for computing the
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372 hash of a portion of OBJECT.
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20
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373 */
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374 (object, start, end))
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0
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375 {
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376 MD_CTX context;
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377 unsigned char digest[16];
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378 unsigned char thehash[32];
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379 int i;
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380
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381 MDInit (&context);
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382
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383 if (NILP (object))
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384 {
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385 MDUpdate (&context, (CONST unsigned char *) "", 0);
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386 }
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387 else if (BUFFERP (object))
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388 {
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389 struct buffer *b = decode_buffer (object, 1);
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390 Bufpos begv, endv;
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391 Lisp_Object string;
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392
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393 /* Figure out where we need to get info from */
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394 get_buffer_range_char (b, start, end, &begv, &endv, GB_ALLOW_NIL);
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395
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396 /* Get the string data from the buffer */
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397 string = make_string_from_buffer (b, begv, endv - begv);
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398
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399 /* Compute the digest */
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16
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400 MDUpdate (&context, (unsigned char *) XSTRING_DATA (string),
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401 XSTRING_LENGTH (string));
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0
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402 }
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403 else
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404 {
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405 Bytecount len, bstart, bend;
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406 CHECK_STRING (object);
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407 get_string_range_byte (object, start, end, &bstart, &bend,
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408 GB_HISTORICAL_STRING_BEHAVIOR);
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409 len = bend - bstart;
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16
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410 MDUpdate (&context, ((unsigned char *) XSTRING_DATA (object)
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0
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411 + bstart), len);
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412 }
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413
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414 MDFinal (digest, &context);
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415 for (i = 0; i < 16; i++)
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416 sprintf ((char *) (thehash + (i * 2)), "%02x", digest[i]);
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417
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418 return (make_string (thehash, 32));
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419 }
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420
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421 void
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422 syms_of_md5 (void)
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|
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423 {
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|
20
|
424 DEFSUBR (Fmd5);
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|
0
|
425 defsymbol (&Qmd5, "md5");
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|
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426 }
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427
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428 void
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|
|
429 vars_of_md5 (void)
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|
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430 {
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|
|
431 Fprovide (Qmd5);
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|
|
432 }
|
