1 2 3 /* 4 *********************************************************************** 5 ** md5.c -- the source code for MD5 routines ** 6 ** RSA Data Security, Inc. MD5 Message-Digest Algorithm ** 7 ** Created: 2/17/90 RLR ** 8 ** Revised: 1/91 SRD,AJ,BSK,JT Reference C ver., 7/10 constant corr. ** 9 *********************************************************************** 10 */ 11 12 /* 13 *********************************************************************** 14 ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved. ** 15 ** ** 16 ** License to copy and use this software is granted provided that ** 17 ** it is identified as the "RSA Data Security, Inc. MD5 Message- ** 18 ** Digest Algorithm" in all material mentioning or referencing this ** 19 ** software or this function. ** 20 ** ** 21 ** License is also granted to make and use derivative works ** 22 ** provided that such works are identified as "derived from the RSA ** 23 ** Data Security, Inc. MD5 Message-Digest Algorithm" in all ** 24 ** material mentioning or referencing the derived work. ** 25 ** ** 26 ** RSA Data Security, Inc. makes no representations concerning ** 27 ** either the merchantability of this software or the suitability ** 28 ** of this software for any particular purpose. It is provided "as ** 29 ** is" without express or implied warranty of any kind. ** 30 ** ** 31 ** These notices must be retained in any copies of any part of this ** 32 ** documentation and/or software. ** 33 *********************************************************************** 34 */ 35 36 #include <string.h> 37 #include "md5.h" 38 39 /* 40 *********************************************************************** 41 ** Message-digest routines: ** 42 ** To form the message digest for a message M ** 43 ** (1) Initialize a context buffer mdContext using MD5_Init ** 44 ** (2) Call MD5_Update on mdContext and M ** 45 ** (3) Call MD5_Final on mdContext ** 46 ** The message digest is now in mdContext->digest[0...15] ** 47 *********************************************************************** 48 */ 49 50 /* forward declaration */ 51 static void Transform (); 52 53 static unsigned char PADDING[64] = { 54 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 55 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 56 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 57 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 58 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 59 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 60 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 61 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 62 }; 63 64 /* F, G, H and I are basic MD5 functions */ 65 #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) 66 #define G(x, y, z) (((x) & (z)) | ((y) & (~z))) 67 #define H(x, y, z) ((x) ^ (y) ^ (z)) 68 #define I(x, y, z) ((y) ^ ((x) | (~z))) 69 70 /* ROTATE_LEFT rotates x left n bits */ 71 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 72 73 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */ 74 /* Rotation is separate from addition to prevent recomputation */ 75 #define FF(a, b, c, d, x, s, ac) \ 76 {(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \ 77 (a) = ROTATE_LEFT ((a), (s)); \ 78 (a) += (b); \ 79 } 80 #define GG(a, b, c, d, x, s, ac) \ 81 {(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \ 82 (a) = ROTATE_LEFT ((a), (s)); \ 83 (a) += (b); \ 84 } 85 #define HH(a, b, c, d, x, s, ac) \ 86 {(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \ 87 (a) = ROTATE_LEFT ((a), (s)); \ 88 (a) += (b); \ 89 } 90 #define II(a, b, c, d, x, s, ac) \ 91 {(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \ 92 (a) = ROTATE_LEFT ((a), (s)); \ 93 (a) += (b); \ 94 } 95 96 #ifdef __STDC__ 97 #define UL(x) x##U 98 #else 99 #define UL(x) x 100 #endif 101 102 /* The routine MD5_Init initializes the message-digest context 103 mdContext. All fields are set to zero. 104 */ 105 void MD5_Init (mdContext) 106 MD5_CTX *mdContext; 107 { 108 mdContext->i[0] = mdContext->i[1] = (UINT4)0; 109 110 /* Load magic initialization constants. 111 */ 112 mdContext->buf[0] = (UINT4)0x67452301; 113 mdContext->buf[1] = (UINT4)0xefcdab89; 114 mdContext->buf[2] = (UINT4)0x98badcfe; 115 mdContext->buf[3] = (UINT4)0x10325476; 116 } 117 118 /* The routine MD5Update updates the message-digest context to 119 account for the presence of each of the characters inBuf[0..inLen-1] 120 in the message whose digest is being computed. 121 */ 122 void MD5_Update (mdContext, inBuf, inLen) 123 MD5_CTX *mdContext; 124 unsigned char *inBuf; 125 unsigned int inLen; 126 { 127 UINT4 in[16]; 128 int mdi; 129 unsigned int i, ii; 130 131 /* compute number of bytes mod 64 */ 132 mdi = (int)((mdContext->i[0] >> 3) & 0x3F); 133 134 /* update number of bits */ 135 if ((mdContext->i[0] + ((UINT4)inLen << 3)) < mdContext->i[0]) 136 mdContext->i[1]++; 137 mdContext->i[0] += ((UINT4)inLen << 3); 138 mdContext->i[1] += ((UINT4)inLen >> 29); 139 140 while (inLen--) { 141 /* add new character to buffer, increment mdi */ 142 mdContext->in[mdi++] = *inBuf++; 143 144 /* transform if necessary */ 145 if (mdi == 0x40) { 146 for (i = 0, ii = 0; i < 16; i++, ii += 4) 147 in[i] = (((UINT4)mdContext->in[ii+3]) << 24) | 148 (((UINT4)mdContext->in[ii+2]) << 16) | 149 (((UINT4)mdContext->in[ii+1]) << 8) | 150 ((UINT4)mdContext->in[ii]); 151 Transform (mdContext->buf, in); 152 mdi = 0; 153 } 154 } 155 } 156 157 /* The routine MD5Final terminates the message-digest computation and 158 ends with the desired message digest in mdContext->digest[0...15]. 159 */ 160 void MD5_Final (hash, mdContext) 161 unsigned char hash[]; 162 MD5_CTX *mdContext; 163 { 164 UINT4 in[16]; 165 int mdi; 166 unsigned int i, ii; 167 unsigned int padLen; 168 169 /* save number of bits */ 170 in[14] = mdContext->i[0]; 171 in[15] = mdContext->i[1]; 172 173 /* compute number of bytes mod 64 */ 174 mdi = (int)((mdContext->i[0] >> 3) & 0x3F); 175 176 /* pad out to 56 mod 64 */ 177 padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi); 178 MD5_Update (mdContext, PADDING, padLen); 179 180 /* append length in bits and transform */ 181 for (i = 0, ii = 0; i < 14; i++, ii += 4) 182 in[i] = (((UINT4)mdContext->in[ii+3]) << 24) | 183 (((UINT4)mdContext->in[ii+2]) << 16) | 184 (((UINT4)mdContext->in[ii+1]) << 8) | 185 ((UINT4)mdContext->in[ii]); 186 Transform (mdContext->buf, in); 187 188 /* store buffer in digest */ 189 for (i = 0, ii = 0; i < 4; i++, ii += 4) { 190 mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF); 191 mdContext->digest[ii+1] = 192 (unsigned char)((mdContext->buf[i] >> 8) & 0xFF); 193 mdContext->digest[ii+2] = 194 (unsigned char)((mdContext->buf[i] >> 16) & 0xFF); 195 mdContext->digest[ii+3] = 196 (unsigned char)((mdContext->buf[i] >> 24) & 0xFF); 197 } 198 memcpy(hash, mdContext->digest, 16); 199 } 200 201 /* Basic MD5 step. Transforms buf based on in. 202 */ 203 static void Transform (buf, in) 204 UINT4 *buf; 205 UINT4 *in; 206 { 207 UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3]; 208 209 /* Round 1 */ 210 #define S11 7 211 #define S12 12 212 #define S13 17 213 #define S14 22 214 FF ( a, b, c, d, in[ 0], S11, UL(3614090360)); /* 1 */ 215 FF ( d, a, b, c, in[ 1], S12, UL(3905402710)); /* 2 */ 216 FF ( c, d, a, b, in[ 2], S13, UL( 606105819)); /* 3 */ 217 FF ( b, c, d, a, in[ 3], S14, UL(3250441966)); /* 4 */ 218 FF ( a, b, c, d, in[ 4], S11, UL(4118548399)); /* 5 */ 219 FF ( d, a, b, c, in[ 5], S12, UL(1200080426)); /* 6 */ 220 FF ( c, d, a, b, in[ 6], S13, UL(2821735955)); /* 7 */ 221 FF ( b, c, d, a, in[ 7], S14, UL(4249261313)); /* 8 */ 222 FF ( a, b, c, d, in[ 8], S11, UL(1770035416)); /* 9 */ 223 FF ( d, a, b, c, in[ 9], S12, UL(2336552879)); /* 10 */ 224 FF ( c, d, a, b, in[10], S13, UL(4294925233)); /* 11 */ 225 FF ( b, c, d, a, in[11], S14, UL(2304563134)); /* 12 */ 226 FF ( a, b, c, d, in[12], S11, UL(1804603682)); /* 13 */ 227 FF ( d, a, b, c, in[13], S12, UL(4254626195)); /* 14 */ 228 FF ( c, d, a, b, in[14], S13, UL(2792965006)); /* 15 */ 229 FF ( b, c, d, a, in[15], S14, UL(1236535329)); /* 16 */ 230 231 /* Round 2 */ 232 #define S21 5 233 #define S22 9 234 #define S23 14 235 #define S24 20 236 GG ( a, b, c, d, in[ 1], S21, UL(4129170786)); /* 17 */ 237 GG ( d, a, b, c, in[ 6], S22, UL(3225465664)); /* 18 */ 238 GG ( c, d, a, b, in[11], S23, UL( 643717713)); /* 19 */ 239 GG ( b, c, d, a, in[ 0], S24, UL(3921069994)); /* 20 */ 240 GG ( a, b, c, d, in[ 5], S21, UL(3593408605)); /* 21 */ 241 GG ( d, a, b, c, in[10], S22, UL( 38016083)); /* 22 */ 242 GG ( c, d, a, b, in[15], S23, UL(3634488961)); /* 23 */ 243 GG ( b, c, d, a, in[ 4], S24, UL(3889429448)); /* 24 */ 244 GG ( a, b, c, d, in[ 9], S21, UL( 568446438)); /* 25 */ 245 GG ( d, a, b, c, in[14], S22, UL(3275163606)); /* 26 */ 246 GG ( c, d, a, b, in[ 3], S23, UL(4107603335)); /* 27 */ 247 GG ( b, c, d, a, in[ 8], S24, UL(1163531501)); /* 28 */ 248 GG ( a, b, c, d, in[13], S21, UL(2850285829)); /* 29 */ 249 GG ( d, a, b, c, in[ 2], S22, UL(4243563512)); /* 30 */ 250 GG ( c, d, a, b, in[ 7], S23, UL(1735328473)); /* 31 */ 251 GG ( b, c, d, a, in[12], S24, UL(2368359562)); /* 32 */ 252 253 /* Round 3 */ 254 #define S31 4 255 #define S32 11 256 #define S33 16 257 #define S34 23 258 HH ( a, b, c, d, in[ 5], S31, UL(4294588738)); /* 33 */ 259 HH ( d, a, b, c, in[ 8], S32, UL(2272392833)); /* 34 */ 260 HH ( c, d, a, b, in[11], S33, UL(1839030562)); /* 35 */ 261 HH ( b, c, d, a, in[14], S34, UL(4259657740)); /* 36 */ 262 HH ( a, b, c, d, in[ 1], S31, UL(2763975236)); /* 37 */ 263 HH ( d, a, b, c, in[ 4], S32, UL(1272893353)); /* 38 */ 264 HH ( c, d, a, b, in[ 7], S33, UL(4139469664)); /* 39 */ 265 HH ( b, c, d, a, in[10], S34, UL(3200236656)); /* 40 */ 266 HH ( a, b, c, d, in[13], S31, UL( 681279174)); /* 41 */ 267 HH ( d, a, b, c, in[ 0], S32, UL(3936430074)); /* 42 */ 268 HH ( c, d, a, b, in[ 3], S33, UL(3572445317)); /* 43 */ 269 HH ( b, c, d, a, in[ 6], S34, UL( 76029189)); /* 44 */ 270 HH ( a, b, c, d, in[ 9], S31, UL(3654602809)); /* 45 */ 271 HH ( d, a, b, c, in[12], S32, UL(3873151461)); /* 46 */ 272 HH ( c, d, a, b, in[15], S33, UL( 530742520)); /* 47 */ 273 HH ( b, c, d, a, in[ 2], S34, UL(3299628645)); /* 48 */ 274 275 /* Round 4 */ 276 #define S41 6 277 #define S42 10 278 #define S43 15 279 #define S44 21 280 II ( a, b, c, d, in[ 0], S41, UL(4096336452)); /* 49 */ 281 II ( d, a, b, c, in[ 7], S42, UL(1126891415)); /* 50 */ 282 II ( c, d, a, b, in[14], S43, UL(2878612391)); /* 51 */ 283 II ( b, c, d, a, in[ 5], S44, UL(4237533241)); /* 52 */ 284 II ( a, b, c, d, in[12], S41, UL(1700485571)); /* 53 */ 285 II ( d, a, b, c, in[ 3], S42, UL(2399980690)); /* 54 */ 286 II ( c, d, a, b, in[10], S43, UL(4293915773)); /* 55 */ 287 II ( b, c, d, a, in[ 1], S44, UL(2240044497)); /* 56 */ 288 II ( a, b, c, d, in[ 8], S41, UL(1873313359)); /* 57 */ 289 II ( d, a, b, c, in[15], S42, UL(4264355552)); /* 58 */ 290 II ( c, d, a, b, in[ 6], S43, UL(2734768916)); /* 59 */ 291 II ( b, c, d, a, in[13], S44, UL(1309151649)); /* 60 */ 292 II ( a, b, c, d, in[ 4], S41, UL(4149444226)); /* 61 */ 293 II ( d, a, b, c, in[11], S42, UL(3174756917)); /* 62 */ 294 II ( c, d, a, b, in[ 2], S43, UL( 718787259)); /* 63 */ 295 II ( b, c, d, a, in[ 9], S44, UL(3951481745)); /* 64 */ 296 297 buf[0] += a; 298 buf[1] += b; 299 buf[2] += c; 300 buf[3] += d; 301 } 302 303 /* 304 *********************************************************************** 305 ** End of md5.c ** 306 ******************************** (cut) ******************************** 307 */ 308
