1/* $FreeBSD$ */ 2 3 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#if defined(linux) && defined(_KERNEL) 39extern void *memcpy(void *, const void *, unsigned long); 40# define bcopy(a,b,c) memcpy(b,a,c) 41#else 42# if defined(_KERNEL) && !defined(__sgi) 43# include <sys/systm.h> 44# else 45# include <string.h> 46# endif 47#endif 48 49#include "md5.h" 50 51/* 52 *********************************************************************** 53 ** Message-digest routines: ** 54 ** To form the message digest for a message M ** 55 ** (1) Initialize a context buffer mdContext using MD5Init ** 56 ** (2) Call MD5Update on mdContext and M ** 57 ** (3) Call MD5Final on mdContext ** 58 ** The message digest is now in mdContext->digest[0...15] ** 59 *********************************************************************** 60 */ 61 62/* forward declaration */ 63static void Transform __P((UINT4 *, UINT4 *)); 64 65static unsigned char PADDING[64] = { 66 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 67 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 68 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 69 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 70 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 71 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 72 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 73 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 74}; 75 76/* F, G, H and I are basic MD5 functions */ 77#define F(x, y, z) (((x) & (y)) | ((~x) & (z))) 78#define G(x, y, z) (((x) & (z)) | ((y) & (~z))) 79#define H(x, y, z) ((x) ^ (y) ^ (z)) 80#define I(x, y, z) ((y) ^ ((x) | (~z))) 81 82/* ROTATE_LEFT rotates x left n bits */ 83#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 84 85/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */ 86/* Rotation is separate from addition to prevent recomputation */ 87#define FF(a, b, c, d, x, s, ac) \ 88 {(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \ 89 (a) = ROTATE_LEFT ((a), (s)); \ 90 (a) += (b); \ 91 } 92#define GG(a, b, c, d, x, s, ac) \ 93 {(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \ 94 (a) = ROTATE_LEFT ((a), (s)); \ 95 (a) += (b); \ 96 } 97#define HH(a, b, c, d, x, s, ac) \ 98 {(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \ 99 (a) = ROTATE_LEFT ((a), (s)); \ 100 (a) += (b); \ 101 } 102#define II(a, b, c, d, x, s, ac) \ 103 {(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \ 104 (a) = ROTATE_LEFT ((a), (s)); \ 105 (a) += (b); \ 106 } 107 108#ifdef __STDC__ 109#define UL(x) x##U 110#else 111#define UL(x) x 112#endif 113 114/* The routine MD5Init initializes the message-digest context 115 mdContext. All fields are set to zero. 116 */ 117void MD5Init (mdContext) 118MD5_CTX *mdContext; 119{ 120 mdContext->i[0] = mdContext->i[1] = (UINT4)0; 121 122 /* Load magic initialization constants. 123 */ 124 mdContext->buf[0] = (UINT4)0x67452301; 125 mdContext->buf[1] = (UINT4)0xefcdab89; 126 mdContext->buf[2] = (UINT4)0x98badcfe; 127 mdContext->buf[3] = (UINT4)0x10325476; 128} 129 130/* The routine MD5Update updates the message-digest context to 131 account for the presence of each of the characters inBuf[0..inLen-1] 132 in the message whose digest is being computed. 133 */ 134void MD5Update (mdContext, inBuf, inLen) 135MD5_CTX *mdContext; 136unsigned char *inBuf; 137unsigned int inLen; 138{ 139 UINT4 in[16]; 140 int mdi; 141 unsigned int i, ii; 142 143 /* compute number of bytes mod 64 */ 144 mdi = (int)((mdContext->i[0] >> 3) & 0x3F); 145 146 /* update number of bits */ 147 if ((mdContext->i[0] + ((UINT4)inLen << 3)) < mdContext->i[0]) 148 mdContext->i[1]++; 149 mdContext->i[0] += ((UINT4)inLen << 3); 150 mdContext->i[1] += ((UINT4)inLen >> 29); 151 152 while (inLen--) { 153 /* add new character to buffer, increment mdi */ 154 mdContext->in[mdi++] = *inBuf++; 155 156 /* transform if necessary */ 157 if (mdi == 0x40) { 158 for (i = 0, ii = 0; i < 16; i++, ii += 4) 159 in[i] = (((UINT4)mdContext->in[ii+3]) << 24) | 160 (((UINT4)mdContext->in[ii+2]) << 16) | 161 (((UINT4)mdContext->in[ii+1]) << 8) | 162 ((UINT4)mdContext->in[ii]); 163 Transform (mdContext->buf, in); 164 mdi = 0; 165 } 166 } 167} 168 169/* The routine MD5Final terminates the message-digest computation and 170 ends with the desired message digest in mdContext->digest[0...15]. 171 */ 172void MD5Final (hash, mdContext) 173unsigned char hash[]; 174MD5_CTX *mdContext; 175{ 176 UINT4 in[16]; 177 int mdi; 178 unsigned int i, ii; 179 unsigned int padLen; 180 181 /* save number of bits */ 182 in[14] = mdContext->i[0]; 183 in[15] = mdContext->i[1]; 184 185 /* compute number of bytes mod 64 */ 186 mdi = (int)((mdContext->i[0] >> 3) & 0x3F); 187 188 /* pad out to 56 mod 64 */ 189 padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi); 190 MD5Update (mdContext, PADDING, padLen); 191 192 /* append length in bits and transform */ 193 for (i = 0, ii = 0; i < 14; i++, ii += 4) 194 in[i] = (((UINT4)mdContext->in[ii+3]) << 24) | 195 (((UINT4)mdContext->in[ii+2]) << 16) | 196 (((UINT4)mdContext->in[ii+1]) << 8) | 197 ((UINT4)mdContext->in[ii]); 198 Transform (mdContext->buf, in); 199 200 /* store buffer in digest */ 201 for (i = 0, ii = 0; i < 4; i++, ii += 4) { 202 mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF); 203 mdContext->digest[ii+1] = 204 (unsigned char)((mdContext->buf[i] >> 8) & 0xFF); 205 mdContext->digest[ii+2] = 206 (unsigned char)((mdContext->buf[i] >> 16) & 0xFF); 207 mdContext->digest[ii+3] = 208 (unsigned char)((mdContext->buf[i] >> 24) & 0xFF); 209 } 210 bcopy((char *)mdContext->digest, (char *)hash, 16); 211} 212 213/* Basic MD5 step. Transforms buf based on in. 214 */ 215static void Transform (buf, in) 216UINT4 *buf; 217UINT4 *in; 218{ 219 UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3]; 220 221 /* Round 1 */ 222#define S11 7 223#define S12 12 224#define S13 17 225#define S14 22 226 FF ( a, b, c, d, in[ 0], S11, UL(3614090360)); /* 1 */ 227 FF ( d, a, b, c, in[ 1], S12, UL(3905402710)); /* 2 */ 228 FF ( c, d, a, b, in[ 2], S13, UL( 606105819)); /* 3 */ 229 FF ( b, c, d, a, in[ 3], S14, UL(3250441966)); /* 4 */ 230 FF ( a, b, c, d, in[ 4], S11, UL(4118548399)); /* 5 */ 231 FF ( d, a, b, c, in[ 5], S12, UL(1200080426)); /* 6 */ 232 FF ( c, d, a, b, in[ 6], S13, UL(2821735955)); /* 7 */ 233 FF ( b, c, d, a, in[ 7], S14, UL(4249261313)); /* 8 */ 234 FF ( a, b, c, d, in[ 8], S11, UL(1770035416)); /* 9 */ 235 FF ( d, a, b, c, in[ 9], S12, UL(2336552879)); /* 10 */ 236 FF ( c, d, a, b, in[10], S13, UL(4294925233)); /* 11 */ 237 FF ( b, c, d, a, in[11], S14, UL(2304563134)); /* 12 */ 238 FF ( a, b, c, d, in[12], S11, UL(1804603682)); /* 13 */ 239 FF ( d, a, b, c, in[13], S12, UL(4254626195)); /* 14 */ 240 FF ( c, d, a, b, in[14], S13, UL(2792965006)); /* 15 */ 241 FF ( b, c, d, a, in[15], S14, UL(1236535329)); /* 16 */ 242 243 /* Round 2 */ 244#define S21 5 245#define S22 9 246#define S23 14 247#define S24 20 248 GG ( a, b, c, d, in[ 1], S21, UL(4129170786)); /* 17 */ 249 GG ( d, a, b, c, in[ 6], S22, UL(3225465664)); /* 18 */ 250 GG ( c, d, a, b, in[11], S23, UL( 643717713)); /* 19 */ 251 GG ( b, c, d, a, in[ 0], S24, UL(3921069994)); /* 20 */ 252 GG ( a, b, c, d, in[ 5], S21, UL(3593408605)); /* 21 */ 253 GG ( d, a, b, c, in[10], S22, UL( 38016083)); /* 22 */ 254 GG ( c, d, a, b, in[15], S23, UL(3634488961)); /* 23 */ 255 GG ( b, c, d, a, in[ 4], S24, UL(3889429448)); /* 24 */ 256 GG ( a, b, c, d, in[ 9], S21, UL( 568446438)); /* 25 */ 257 GG ( d, a, b, c, in[14], S22, UL(3275163606)); /* 26 */ 258 GG ( c, d, a, b, in[ 3], S23, UL(4107603335)); /* 27 */ 259 GG ( b, c, d, a, in[ 8], S24, UL(1163531501)); /* 28 */ 260 GG ( a, b, c, d, in[13], S21, UL(2850285829)); /* 29 */ 261 GG ( d, a, b, c, in[ 2], S22, UL(4243563512)); /* 30 */ 262 GG ( c, d, a, b, in[ 7], S23, UL(1735328473)); /* 31 */ 263 GG ( b, c, d, a, in[12], S24, UL(2368359562)); /* 32 */ 264 265 /* Round 3 */ 266#define S31 4 267#define S32 11 268#define S33 16 269#define S34 23 270 HH ( a, b, c, d, in[ 5], S31, UL(4294588738)); /* 33 */ 271 HH ( d, a, b, c, in[ 8], S32, UL(2272392833)); /* 34 */ 272 HH ( c, d, a, b, in[11], S33, UL(1839030562)); /* 35 */ 273 HH ( b, c, d, a, in[14], S34, UL(4259657740)); /* 36 */ 274 HH ( a, b, c, d, in[ 1], S31, UL(2763975236)); /* 37 */ 275 HH ( d, a, b, c, in[ 4], S32, UL(1272893353)); /* 38 */ 276 HH ( c, d, a, b, in[ 7], S33, UL(4139469664)); /* 39 */ 277 HH ( b, c, d, a, in[10], S34, UL(3200236656)); /* 40 */ 278 HH ( a, b, c, d, in[13], S31, UL( 681279174)); /* 41 */ 279 HH ( d, a, b, c, in[ 0], S32, UL(3936430074)); /* 42 */ 280 HH ( c, d, a, b, in[ 3], S33, UL(3572445317)); /* 43 */ 281 HH ( b, c, d, a, in[ 6], S34, UL( 76029189)); /* 44 */ 282 HH ( a, b, c, d, in[ 9], S31, UL(3654602809)); /* 45 */ 283 HH ( d, a, b, c, in[12], S32, UL(3873151461)); /* 46 */ 284 HH ( c, d, a, b, in[15], S33, UL( 530742520)); /* 47 */ 285 HH ( b, c, d, a, in[ 2], S34, UL(3299628645)); /* 48 */ 286 287 /* Round 4 */ 288#define S41 6 289#define S42 10 290#define S43 15 291#define S44 21 292 II ( a, b, c, d, in[ 0], S41, UL(4096336452)); /* 49 */ 293 II ( d, a, b, c, in[ 7], S42, UL(1126891415)); /* 50 */ 294 II ( c, d, a, b, in[14], S43, UL(2878612391)); /* 51 */ 295 II ( b, c, d, a, in[ 5], S44, UL(4237533241)); /* 52 */ 296 II ( a, b, c, d, in[12], S41, UL(1700485571)); /* 53 */ 297 II ( d, a, b, c, in[ 3], S42, UL(2399980690)); /* 54 */ 298 II ( c, d, a, b, in[10], S43, UL(4293915773)); /* 55 */ 299 II ( b, c, d, a, in[ 1], S44, UL(2240044497)); /* 56 */ 300 II ( a, b, c, d, in[ 8], S41, UL(1873313359)); /* 57 */ 301 II ( d, a, b, c, in[15], S42, UL(4264355552)); /* 58 */ 302 II ( c, d, a, b, in[ 6], S43, UL(2734768916)); /* 59 */ 303 II ( b, c, d, a, in[13], S44, UL(1309151649)); /* 60 */ 304 II ( a, b, c, d, in[ 4], S41, UL(4149444226)); /* 61 */ 305 II ( d, a, b, c, in[11], S42, UL(3174756917)); /* 62 */ 306 II ( c, d, a, b, in[ 2], S43, UL( 718787259)); /* 63 */ 307 II ( b, c, d, a, in[ 9], S44, UL(3951481745)); /* 64 */ 308 309 buf[0] += a; 310 buf[1] += b; 311 buf[2] += c; 312 buf[3] += d; 313} 314 315/* 316 *********************************************************************** 317 ** End of md5.c ** 318 ******************************** (cut) ******************************** 319 */ 320