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