1 #pragma ident "%Z%%M% %I% %E% SMI" 2 3 #include "md5.h" 4 5 /* 6 ************************************************************************** 7 ** md5.c -- the source code for MD5 routines ** 8 ** RSA Data Security, Inc. MD5 Message-Digest Algorithm ** 9 ** Created: 2/17/90 RLR ** 10 ** Revised: 1/91 SRD, AJ, BSK, JT Reference C ver., 7/10 constant corr. ** 11 ************************************************************************** 12 */ 13 14 /* 15 ************************************************************************** 16 ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved. ** 17 ** ** 18 ** License to copy and use this software is granted provided that ** 19 ** it is identified as the "RSA Data Security, Inc. MD5 Message- ** 20 ** Digest Algorithm" in all material mentioning or referencing this ** 21 ** software or this function. ** 22 ** ** 23 ** License is also granted to make and use derivative works ** 24 ** provided that such works are identified as "derived from the RSA ** 25 ** Data Security, Inc. MD5 Message-Digest Algorithm" in all ** 26 ** material mentioning or referencing the derived work. ** 27 ** ** 28 ** RSA Data Security, Inc. makes no representations concerning ** 29 ** either the merchantability of this software or the suitability ** 30 ** of this software for any particular purpose. It is provided "as ** 31 ** is" without express or implied warranty of any kind. ** 32 ** ** 33 ** These notices must be retained in any copies of any part of this ** 34 ** documentation and/or software. ** 35 ************************************************************************** 36 */ 37 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 MD5Init ** 44 ** (2) Call MD5Update on mdContext and M ** 45 ** (3) Call MD5Final on mdContext ** 46 ** The message digest is now in mdContext->digest[0...15] ** 47 ************************************************************************** 48 */ 49 50 /* forward declaration */ 51 static void Transform (UINT4 *buf, UINT4 *in); 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 /* 97 * The routine MD5Init initializes the message-digest context 98 * mdContext. All fields are set to zero. 99 */ 100 void MD5Init (MD5_CTX *mdContext) 101 { 102 mdContext->i[0] = mdContext->i[1] = (UINT4)0; 103 104 /* 105 * Load magic initialization constants. 106 */ 107 mdContext->buf[0] = (UINT4)0x67452301; 108 mdContext->buf[1] = (UINT4)0xefcdab89; 109 mdContext->buf[2] = (UINT4)0x98badcfe; 110 mdContext->buf[3] = (UINT4)0x10325476; 111 } 112 113 /* 114 * The routine MD5Update updates the message-digest context to 115 * account for the presence of each of the characters inBuf[0..inLen-1] 116 * in the message whose digest is being computed. 117 */ 118 void MD5Update (MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen) 119 { 120 UINT4 in[16]; 121 int mdi; 122 unsigned int i, ii; 123 124 /* compute number of bytes mod 64 */ 125 mdi = (int)((mdContext->i[0] >> 3) & 0x3F); 126 127 /* update number of bits */ 128 if ((mdContext->i[0] + ((UINT4)inLen << 3)) < mdContext->i[0]) 129 mdContext->i[1]++; 130 mdContext->i[0] += ((UINT4)inLen << 3); 131 mdContext->i[1] += ((UINT4)inLen >> 29); 132 133 while (inLen--) { 134 /* add new character to buffer, increment mdi */ 135 mdContext->in[mdi++] = *inBuf++; 136 137 /* transform if necessary */ 138 if (mdi == 0x40) { 139 for (i = 0, ii = 0; i < 16; i++, ii += 4) 140 in[i] = (((UINT4)mdContext->in[ii+3]) << 24) | 141 (((UINT4)mdContext->in[ii+2]) << 16) | 142 (((UINT4)mdContext->in[ii+1]) << 8) | 143 ((UINT4)mdContext->in[ii]); 144 Transform (mdContext->buf, in); 145 mdi = 0; 146 } 147 } 148 } 149 150 /* 151 * The routine MD5Final terminates the message-digest computation and 152 * ends with the desired message digest in mdContext->digest[0...15]. 153 */ 154 void MD5Final (MD5_CTX *mdContext) 155 { 156 UINT4 in[16]; 157 int mdi; 158 unsigned int i, ii; 159 unsigned int padLen; 160 161 /* save number of bits */ 162 in[14] = mdContext->i[0]; 163 in[15] = mdContext->i[1]; 164 165 /* compute number of bytes mod 64 */ 166 mdi = (int)((mdContext->i[0] >> 3) & 0x3F); 167 168 /* pad out to 56 mod 64 */ 169 padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi); 170 MD5Update (mdContext, PADDING, padLen); 171 172 /* append length in bits and transform */ 173 for (i = 0, ii = 0; i < 14; i++, ii += 4) 174 in[i] = (((UINT4)mdContext->in[ii+3]) << 24) | 175 (((UINT4)mdContext->in[ii+2]) << 16) | 176 (((UINT4)mdContext->in[ii+1]) << 8) | 177 ((UINT4)mdContext->in[ii]); 178 Transform (mdContext->buf, in); 179 180 /* store buffer in digest */ 181 for (i = 0, ii = 0; i < 4; i++, ii += 4) { 182 mdContext->digest[ii] = 183 (unsigned char)(mdContext->buf[i] & 0xFF); 184 mdContext->digest[ii+1] = 185 (unsigned char)((mdContext->buf[i] >> 8) & 0xFF); 186 mdContext->digest[ii+2] = 187 (unsigned char)((mdContext->buf[i] >> 16) & 0xFF); 188 mdContext->digest[ii+3] = 189 (unsigned char)((mdContext->buf[i] >> 24) & 0xFF); 190 } 191 } 192 193 /* 194 * Basic MD5 step. Transforms buf based on in. 195 */ 196 static void Transform (UINT4 *buf, UINT4 *in) 197 { 198 UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3]; 199 200 /* Round 1 */ 201 #define S11 7 202 #define S12 12 203 #define S13 17 204 #define S14 22 205 FF (a, b, c, d, in[ 0], S11, 3614090360); /* 1 */ 206 FF (d, a, b, c, in[ 1], S12, 3905402710); /* 2 */ 207 FF (c, d, a, b, in[ 2], S13, 606105819); /* 3 */ 208 FF (b, c, d, a, in[ 3], S14, 3250441966); /* 4 */ 209 FF (a, b, c, d, in[ 4], S11, 4118548399); /* 5 */ 210 FF (d, a, b, c, in[ 5], S12, 1200080426); /* 6 */ 211 FF (c, d, a, b, in[ 6], S13, 2821735955); /* 7 */ 212 FF (b, c, d, a, in[ 7], S14, 4249261313); /* 8 */ 213 FF (a, b, c, d, in[ 8], S11, 1770035416); /* 9 */ 214 FF (d, a, b, c, in[ 9], S12, 2336552879); /* 10 */ 215 FF (c, d, a, b, in[10], S13, 4294925233); /* 11 */ 216 FF (b, c, d, a, in[11], S14, 2304563134); /* 12 */ 217 FF (a, b, c, d, in[12], S11, 1804603682); /* 13 */ 218 FF (d, a, b, c, in[13], S12, 4254626195); /* 14 */ 219 FF (c, d, a, b, in[14], S13, 2792965006); /* 15 */ 220 FF (b, c, d, a, in[15], S14, 1236535329); /* 16 */ 221 222 /* Round 2 */ 223 #define S21 5 224 #define S22 9 225 #define S23 14 226 #define S24 20 227 GG (a, b, c, d, in[ 1], S21, 4129170786); /* 17 */ 228 GG (d, a, b, c, in[ 6], S22, 3225465664); /* 18 */ 229 GG (c, d, a, b, in[11], S23, 643717713); /* 19 */ 230 GG (b, c, d, a, in[ 0], S24, 3921069994); /* 20 */ 231 GG (a, b, c, d, in[ 5], S21, 3593408605); /* 21 */ 232 GG (d, a, b, c, in[10], S22, 38016083); /* 22 */ 233 GG (c, d, a, b, in[15], S23, 3634488961); /* 23 */ 234 GG (b, c, d, a, in[ 4], S24, 3889429448); /* 24 */ 235 GG (a, b, c, d, in[ 9], S21, 568446438); /* 25 */ 236 GG (d, a, b, c, in[14], S22, 3275163606); /* 26 */ 237 GG (c, d, a, b, in[ 3], S23, 4107603335); /* 27 */ 238 GG (b, c, d, a, in[ 8], S24, 1163531501); /* 28 */ 239 GG (a, b, c, d, in[13], S21, 2850285829); /* 29 */ 240 GG (d, a, b, c, in[ 2], S22, 4243563512); /* 30 */ 241 GG (c, d, a, b, in[ 7], S23, 1735328473); /* 31 */ 242 GG (b, c, d, a, in[12], S24, 2368359562); /* 32 */ 243 244 /* Round 3 */ 245 #define S31 4 246 #define S32 11 247 #define S33 16 248 #define S34 23 249 HH (a, b, c, d, in[ 5], S31, 4294588738); /* 33 */ 250 HH (d, a, b, c, in[ 8], S32, 2272392833); /* 34 */ 251 HH (c, d, a, b, in[11], S33, 1839030562); /* 35 */ 252 HH (b, c, d, a, in[14], S34, 4259657740); /* 36 */ 253 HH (a, b, c, d, in[ 1], S31, 2763975236); /* 37 */ 254 HH (d, a, b, c, in[ 4], S32, 1272893353); /* 38 */ 255 HH (c, d, a, b, in[ 7], S33, 4139469664); /* 39 */ 256 HH (b, c, d, a, in[10], S34, 3200236656); /* 40 */ 257 HH (a, b, c, d, in[13], S31, 681279174); /* 41 */ 258 HH (d, a, b, c, in[ 0], S32, 3936430074); /* 42 */ 259 HH (c, d, a, b, in[ 3], S33, 3572445317); /* 43 */ 260 HH (b, c, d, a, in[ 6], S34, 76029189); /* 44 */ 261 HH (a, b, c, d, in[ 9], S31, 3654602809); /* 45 */ 262 HH (d, a, b, c, in[12], S32, 3873151461); /* 46 */ 263 HH (c, d, a, b, in[15], S33, 530742520); /* 47 */ 264 HH (b, c, d, a, in[ 2], S34, 3299628645); /* 48 */ 265 266 /* Round 4 */ 267 #define S41 6 268 #define S42 10 269 #define S43 15 270 #define S44 21 271 II (a, b, c, d, in[ 0], S41, 4096336452); /* 49 */ 272 II (d, a, b, c, in[ 7], S42, 1126891415); /* 50 */ 273 II (c, d, a, b, in[14], S43, 2878612391); /* 51 */ 274 II (b, c, d, a, in[ 5], S44, 4237533241); /* 52 */ 275 II (a, b, c, d, in[12], S41, 1700485571); /* 53 */ 276 II (d, a, b, c, in[ 3], S42, 2399980690); /* 54 */ 277 II (c, d, a, b, in[10], S43, 4293915773); /* 55 */ 278 II (b, c, d, a, in[ 1], S44, 2240044497); /* 56 */ 279 II (a, b, c, d, in[ 8], S41, 1873313359); /* 57 */ 280 II (d, a, b, c, in[15], S42, 4264355552); /* 58 */ 281 II (c, d, a, b, in[ 6], S43, 2734768916); /* 59 */ 282 II (b, c, d, a, in[13], S44, 1309151649); /* 60 */ 283 II (a, b, c, d, in[ 4], S41, 4149444226); /* 61 */ 284 II (d, a, b, c, in[11], S42, 3174756917); /* 62 */ 285 II (c, d, a, b, in[ 2], S43, 718787259); /* 63 */ 286 II (b, c, d, a, in[ 9], S44, 3951481745); /* 64 */ 287 288 buf[0] += a; 289 buf[1] += b; 290 buf[2] += c; 291 buf[3] += d; 292 } 293