1 /* 2 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 6 #include "md5.h" 7 8 /* 9 ************************************************************************** 10 ** md5.c -- the source code for MD5 routines ** 11 ** RSA Data Security, Inc. MD5 Message-Digest Algorithm ** 12 ** Created: 2/17/90 RLR ** 13 ** Revised: 1/91 SRD, AJ, BSK, JT Reference C ver., 7/10 constant corr. ** 14 ************************************************************************** 15 */ 16 17 /* 18 ************************************************************************** 19 ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved. ** 20 ** ** 21 ** License to copy and use this software is granted provided that ** 22 ** it is identified as the "RSA Data Security, Inc. MD5 Message- ** 23 ** Digest Algorithm" in all material mentioning or referencing this ** 24 ** software or this function. ** 25 ** ** 26 ** License is also granted to make and use derivative works ** 27 ** provided that such works are identified as "derived from the RSA ** 28 ** Data Security, Inc. MD5 Message-Digest Algorithm" in all ** 29 ** material mentioning or referencing the derived work. ** 30 ** ** 31 ** RSA Data Security, Inc. makes no representations concerning ** 32 ** either the merchantability of this software or the suitability ** 33 ** of this software for any particular purpose. It is provided "as ** 34 ** is" without express or implied warranty of any kind. ** 35 ** ** 36 ** These notices must be retained in any copies of any part of this ** 37 ** documentation and/or software. ** 38 ************************************************************************** 39 */ 40 41 42 /* 43 ************************************************************************** 44 ** Message-digest routines: ** 45 ** To form the message digest for a message M ** 46 ** (1) Initialize a context buffer mdContext using MD5Init ** 47 ** (2) Call MD5Update on mdContext and M ** 48 ** (3) Call MD5Final on mdContext ** 49 ** The message digest is now in mdContext->digest[0...15] ** 50 ************************************************************************** 51 */ 52 53 /* forward declaration */ 54 static void Transform (UINT4 *buf, UINT4 *in); 55 56 static unsigned char PADDING[64] = { 57 0x80, 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 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 63 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 64 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 65 }; 66 67 /* F, G, H and I are basic MD5 functions */ 68 #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) 69 #define G(x, y, z) (((x) & (z)) | ((y) & (~z))) 70 #define H(x, y, z) ((x) ^ (y) ^ (z)) 71 #define I(x, y, z) ((y) ^ ((x) | (~z))) 72 73 /* ROTATE_LEFT rotates x left n bits */ 74 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 75 76 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */ 77 /* Rotation is separate from addition to prevent recomputation */ 78 #define FF(a, b, c, d, x, s, ac) \ 79 {(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \ 80 (a) = ROTATE_LEFT ((a), (s)); \ 81 (a) += (b); \ 82 } 83 #define GG(a, b, c, d, x, s, ac) \ 84 {(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \ 85 (a) = ROTATE_LEFT ((a), (s)); \ 86 (a) += (b); \ 87 } 88 #define HH(a, b, c, d, x, s, ac) \ 89 {(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \ 90 (a) = ROTATE_LEFT ((a), (s)); \ 91 (a) += (b); \ 92 } 93 #define II(a, b, c, d, x, s, ac) \ 94 {(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \ 95 (a) = ROTATE_LEFT ((a), (s)); \ 96 (a) += (b); \ 97 } 98 99 /* 100 * The routine MD5Init initializes the message-digest context 101 * mdContext. All fields are set to zero. 102 */ 103 void MD5Init (MD5_CTX *mdContext) 104 { 105 mdContext->i[0] = mdContext->i[1] = (UINT4)0; 106 107 /* 108 * Load magic initialization constants. 109 */ 110 mdContext->buf[0] = (UINT4)0x67452301; 111 mdContext->buf[1] = (UINT4)0xefcdab89; 112 mdContext->buf[2] = (UINT4)0x98badcfe; 113 mdContext->buf[3] = (UINT4)0x10325476; 114 } 115 116 /* 117 * The routine MD5Update updates the message-digest context to 118 * account for the presence of each of the characters inBuf[0..inLen-1] 119 * in the message whose digest is being computed. 120 */ 121 void MD5Update (MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen) 122 { 123 UINT4 in[16]; 124 int mdi; 125 unsigned int i, ii; 126 127 /* compute number of bytes mod 64 */ 128 mdi = (int)((mdContext->i[0] >> 3) & 0x3F); 129 130 /* update number of bits */ 131 if ((mdContext->i[0] + ((UINT4)inLen << 3)) < mdContext->i[0]) 132 mdContext->i[1]++; 133 mdContext->i[0] += ((UINT4)inLen << 3); 134 mdContext->i[1] += ((UINT4)inLen >> 29); 135 136 while (inLen--) { 137 /* add new character to buffer, increment mdi */ 138 mdContext->in[mdi++] = *inBuf++; 139 140 /* transform if necessary */ 141 if (mdi == 0x40) { 142 for (i = 0, ii = 0; i < 16; i++, ii += 4) 143 in[i] = (((UINT4)mdContext->in[ii+3]) << 24) | 144 (((UINT4)mdContext->in[ii+2]) << 16) | 145 (((UINT4)mdContext->in[ii+1]) << 8) | 146 ((UINT4)mdContext->in[ii]); 147 Transform (mdContext->buf, in); 148 mdi = 0; 149 } 150 } 151 } 152 153 /* 154 * The routine MD5Final terminates the message-digest computation and 155 * ends with the desired message digest in mdContext->digest[0...15]. 156 */ 157 void MD5Final (MD5_CTX *mdContext) 158 { 159 UINT4 in[16]; 160 int mdi; 161 unsigned int i, ii; 162 unsigned int padLen; 163 164 /* save number of bits */ 165 in[14] = mdContext->i[0]; 166 in[15] = mdContext->i[1]; 167 168 /* compute number of bytes mod 64 */ 169 mdi = (int)((mdContext->i[0] >> 3) & 0x3F); 170 171 /* pad out to 56 mod 64 */ 172 padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi); 173 MD5Update (mdContext, PADDING, padLen); 174 175 /* append length in bits and transform */ 176 for (i = 0, ii = 0; i < 14; i++, ii += 4) 177 in[i] = (((UINT4)mdContext->in[ii+3]) << 24) | 178 (((UINT4)mdContext->in[ii+2]) << 16) | 179 (((UINT4)mdContext->in[ii+1]) << 8) | 180 ((UINT4)mdContext->in[ii]); 181 Transform (mdContext->buf, in); 182 183 /* store buffer in digest */ 184 for (i = 0, ii = 0; i < 4; i++, ii += 4) { 185 mdContext->digest[ii] = 186 (unsigned char)(mdContext->buf[i] & 0xFF); 187 mdContext->digest[ii+1] = 188 (unsigned char)((mdContext->buf[i] >> 8) & 0xFF); 189 mdContext->digest[ii+2] = 190 (unsigned char)((mdContext->buf[i] >> 16) & 0xFF); 191 mdContext->digest[ii+3] = 192 (unsigned char)((mdContext->buf[i] >> 24) & 0xFF); 193 } 194 } 195 196 /* 197 * Basic MD5 step. Transforms buf based on in. 198 */ 199 static void Transform (UINT4 *buf, UINT4 *in) 200 { 201 UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3]; 202 203 /* Round 1 */ 204 #define S11 7 205 #define S12 12 206 #define S13 17 207 #define S14 22 208 FF (a, b, c, d, in[ 0], S11, 3614090360U); /* 1 */ 209 FF (d, a, b, c, in[ 1], S12, 3905402710U); /* 2 */ 210 FF (c, d, a, b, in[ 2], S13, 606105819U); /* 3 */ 211 FF (b, c, d, a, in[ 3], S14, 3250441966U); /* 4 */ 212 FF (a, b, c, d, in[ 4], S11, 4118548399U); /* 5 */ 213 FF (d, a, b, c, in[ 5], S12, 1200080426U); /* 6 */ 214 FF (c, d, a, b, in[ 6], S13, 2821735955U); /* 7 */ 215 FF (b, c, d, a, in[ 7], S14, 4249261313U); /* 8 */ 216 FF (a, b, c, d, in[ 8], S11, 1770035416U); /* 9 */ 217 FF (d, a, b, c, in[ 9], S12, 2336552879U); /* 10 */ 218 FF (c, d, a, b, in[10], S13, 4294925233U); /* 11 */ 219 FF (b, c, d, a, in[11], S14, 2304563134U); /* 12 */ 220 FF (a, b, c, d, in[12], S11, 1804603682U); /* 13 */ 221 FF (d, a, b, c, in[13], S12, 4254626195U); /* 14 */ 222 FF (c, d, a, b, in[14], S13, 2792965006U); /* 15 */ 223 FF (b, c, d, a, in[15], S14, 1236535329U); /* 16 */ 224 225 /* Round 2 */ 226 #define S21 5 227 #define S22 9 228 #define S23 14 229 #define S24 20 230 GG (a, b, c, d, in[ 1], S21, 4129170786U); /* 17 */ 231 GG (d, a, b, c, in[ 6], S22, 3225465664U); /* 18 */ 232 GG (c, d, a, b, in[11], S23, 643717713U); /* 19 */ 233 GG (b, c, d, a, in[ 0], S24, 3921069994U); /* 20 */ 234 GG (a, b, c, d, in[ 5], S21, 3593408605U); /* 21 */ 235 GG (d, a, b, c, in[10], S22, 38016083U); /* 22 */ 236 GG (c, d, a, b, in[15], S23, 3634488961U); /* 23 */ 237 GG (b, c, d, a, in[ 4], S24, 3889429448U); /* 24 */ 238 GG (a, b, c, d, in[ 9], S21, 568446438U); /* 25 */ 239 GG (d, a, b, c, in[14], S22, 3275163606U); /* 26 */ 240 GG (c, d, a, b, in[ 3], S23, 4107603335U); /* 27 */ 241 GG (b, c, d, a, in[ 8], S24, 1163531501U); /* 28 */ 242 GG (a, b, c, d, in[13], S21, 2850285829U); /* 29 */ 243 GG (d, a, b, c, in[ 2], S22, 4243563512U); /* 30 */ 244 GG (c, d, a, b, in[ 7], S23, 1735328473U); /* 31 */ 245 GG (b, c, d, a, in[12], S24, 2368359562U); /* 32 */ 246 247 /* Round 3 */ 248 #define S31 4 249 #define S32 11 250 #define S33 16 251 #define S34 23 252 HH (a, b, c, d, in[ 5], S31, 4294588738U); /* 33 */ 253 HH (d, a, b, c, in[ 8], S32, 2272392833U); /* 34 */ 254 HH (c, d, a, b, in[11], S33, 1839030562U); /* 35 */ 255 HH (b, c, d, a, in[14], S34, 4259657740U); /* 36 */ 256 HH (a, b, c, d, in[ 1], S31, 2763975236U); /* 37 */ 257 HH (d, a, b, c, in[ 4], S32, 1272893353U); /* 38 */ 258 HH (c, d, a, b, in[ 7], S33, 4139469664U); /* 39 */ 259 HH (b, c, d, a, in[10], S34, 3200236656U); /* 40 */ 260 HH (a, b, c, d, in[13], S31, 681279174U); /* 41 */ 261 HH (d, a, b, c, in[ 0], S32, 3936430074U); /* 42 */ 262 HH (c, d, a, b, in[ 3], S33, 3572445317U); /* 43 */ 263 HH (b, c, d, a, in[ 6], S34, 76029189U); /* 44 */ 264 HH (a, b, c, d, in[ 9], S31, 3654602809U); /* 45 */ 265 HH (d, a, b, c, in[12], S32, 3873151461U); /* 46 */ 266 HH (c, d, a, b, in[15], S33, 530742520U); /* 47 */ 267 HH (b, c, d, a, in[ 2], S34, 3299628645U); /* 48 */ 268 269 /* Round 4 */ 270 #define S41 6 271 #define S42 10 272 #define S43 15 273 #define S44 21 274 II (a, b, c, d, in[ 0], S41, 4096336452U); /* 49 */ 275 II (d, a, b, c, in[ 7], S42, 1126891415U); /* 50 */ 276 II (c, d, a, b, in[14], S43, 2878612391U); /* 51 */ 277 II (b, c, d, a, in[ 5], S44, 4237533241U); /* 52 */ 278 II (a, b, c, d, in[12], S41, 1700485571U); /* 53 */ 279 II (d, a, b, c, in[ 3], S42, 2399980690U); /* 54 */ 280 II (c, d, a, b, in[10], S43, 4293915773U); /* 55 */ 281 II (b, c, d, a, in[ 1], S44, 2240044497U); /* 56 */ 282 II (a, b, c, d, in[ 8], S41, 1873313359U); /* 57 */ 283 II (d, a, b, c, in[15], S42, 4264355552U); /* 58 */ 284 II (c, d, a, b, in[ 6], S43, 2734768916U); /* 59 */ 285 II (b, c, d, a, in[13], S44, 1309151649U); /* 60 */ 286 II (a, b, c, d, in[ 4], S41, 4149444226U); /* 61 */ 287 II (d, a, b, c, in[11], S42, 3174756917U); /* 62 */ 288 II (c, d, a, b, in[ 2], S43, 718787259U); /* 63 */ 289 II (b, c, d, a, in[ 9], S44, 3951481745U); /* 64 */ 290 291 buf[0] += a; 292 buf[1] += b; 293 buf[2] += c; 294 buf[3] += d; 295 } 296