1 2 3 4 /* 5 *********************************************************************** 6 ** md5.c -- the source code for MD5 routines ** 7 ** RSA Data Security, Inc. MD5 Message-Digest Algorithm ** 8 ** Created: 2/17/90 RLR ** 9 ** Revised: 1/91 SRD,AJ,BSK,JT Reference C ver., 7/10 constant corr. ** 10 *********************************************************************** 11 */ 12 13 /* 14 *********************************************************************** 15 ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved. ** 16 ** ** 17 ** License to copy and use this software is granted provided that ** 18 ** it is identified as the "RSA Data Security, Inc. MD5 Message- ** 19 ** Digest Algorithm" in all material mentioning or referencing this ** 20 ** software or this function. ** 21 ** ** 22 ** License is also granted to make and use derivative works ** 23 ** provided that such works are identified as "derived from the RSA ** 24 ** Data Security, Inc. MD5 Message-Digest Algorithm" in all ** 25 ** material mentioning or referencing the derived work. ** 26 ** ** 27 ** RSA Data Security, Inc. makes no representations concerning ** 28 ** either the merchantability of this software or the suitability ** 29 ** of this software for any particular purpose. It is provided "as ** 30 ** is" without express or implied warranty of any kind. ** 31 ** ** 32 ** These notices must be retained in any copies of any part of this ** 33 ** documentation and/or software. ** 34 *********************************************************************** 35 */ 36 37 # if defined(_KERNEL) 38 # include <sys/systm.h> 39 # else 40 # include <string.h> 41 # endif 42 43 #include "md5.h" 44 45 /* 46 *********************************************************************** 47 ** Message-digest routines: ** 48 ** To form the message digest for a message M ** 49 ** (1) Initialize a context buffer mdContext using MD5Init ** 50 ** (2) Call MD5Update on mdContext and M ** 51 ** (3) Call MD5Final on mdContext ** 52 ** The message digest is now in mdContext->digest[0...15] ** 53 *********************************************************************** 54 */ 55 56 /* forward declaration */ 57 static void Transform(UINT4 *, UINT4 *); 58 59 static unsigned char PADDING[64] = { 60 0x80, 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 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 }; 69 70 /* F, G, H and I are basic MD5 functions */ 71 #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) 72 #define G(x, y, z) (((x) & (z)) | ((y) & (~z))) 73 #define H(x, y, z) ((x) ^ (y) ^ (z)) 74 #define I(x, y, z) ((y) ^ ((x) | (~z))) 75 76 /* ROTATE_LEFT rotates x left n bits */ 77 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 78 79 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */ 80 /* Rotation is separate from addition to prevent recomputation */ 81 #define FF(a, b, c, d, x, s, ac) \ 82 {(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \ 83 (a) = ROTATE_LEFT ((a), (s)); \ 84 (a) += (b); \ 85 } 86 #define GG(a, b, c, d, x, s, ac) \ 87 {(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \ 88 (a) = ROTATE_LEFT ((a), (s)); \ 89 (a) += (b); \ 90 } 91 #define HH(a, b, c, d, x, s, ac) \ 92 {(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \ 93 (a) = ROTATE_LEFT ((a), (s)); \ 94 (a) += (b); \ 95 } 96 #define II(a, b, c, d, x, s, ac) \ 97 {(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \ 98 (a) = ROTATE_LEFT ((a), (s)); \ 99 (a) += (b); \ 100 } 101 102 #define UL(x) x##U 103 104 /* The routine MD5Init initializes the message-digest context 105 mdContext. All fields are set to zero. 106 */ 107 void MD5Init (MD5_CTX *mdContext) 108 { 109 mdContext->i[0] = mdContext->i[1] = (UINT4)0; 110 111 /* Load magic initialization constants. 112 */ 113 mdContext->buf[0] = (UINT4)0x67452301; 114 mdContext->buf[1] = (UINT4)0xefcdab89; 115 mdContext->buf[2] = (UINT4)0x98badcfe; 116 mdContext->buf[3] = (UINT4)0x10325476; 117 } 118 119 /* The routine MD5Update updates the message-digest context to 120 account for the presence of each of the characters inBuf[0..inLen-1] 121 in the message whose digest is being computed. 122 */ 123 void MD5Update (MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen) 124 { 125 UINT4 in[16]; 126 int mdi; 127 unsigned int i, ii; 128 129 /* compute number of bytes mod 64 */ 130 mdi = (int)((mdContext->i[0] >> 3) & 0x3F); 131 132 /* update number of bits */ 133 if ((mdContext->i[0] + ((UINT4)inLen << 3)) < mdContext->i[0]) 134 mdContext->i[1]++; 135 mdContext->i[0] += ((UINT4)inLen << 3); 136 mdContext->i[1] += ((UINT4)inLen >> 29); 137 138 while (inLen--) { 139 /* add new character to buffer, increment mdi */ 140 mdContext->in[mdi++] = *inBuf++; 141 142 /* transform if necessary */ 143 if (mdi == 0x40) { 144 for (i = 0, ii = 0; i < 16; i++, ii += 4) 145 in[i] = (((UINT4)mdContext->in[ii+3]) << 24) | 146 (((UINT4)mdContext->in[ii+2]) << 16) | 147 (((UINT4)mdContext->in[ii+1]) << 8) | 148 ((UINT4)mdContext->in[ii]); 149 Transform (mdContext->buf, in); 150 mdi = 0; 151 } 152 } 153 } 154 155 /* The routine MD5Final terminates the message-digest computation and 156 ends with the desired message digest in mdContext->digest[0...15]. 157 */ 158 void MD5Final (unsigned char hash[], MD5_CTX *mdContext) 159 { 160 UINT4 in[16]; 161 int mdi; 162 unsigned int i, ii; 163 unsigned int padLen; 164 165 /* save number of bits */ 166 in[14] = mdContext->i[0]; 167 in[15] = mdContext->i[1]; 168 169 /* compute number of bytes mod 64 */ 170 mdi = (int)((mdContext->i[0] >> 3) & 0x3F); 171 172 /* pad out to 56 mod 64 */ 173 padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi); 174 MD5Update (mdContext, PADDING, padLen); 175 176 /* append length in bits and transform */ 177 for (i = 0, ii = 0; i < 14; i++, ii += 4) 178 in[i] = (((UINT4)mdContext->in[ii+3]) << 24) | 179 (((UINT4)mdContext->in[ii+2]) << 16) | 180 (((UINT4)mdContext->in[ii+1]) << 8) | 181 ((UINT4)mdContext->in[ii]); 182 Transform (mdContext->buf, in); 183 184 /* store buffer in digest */ 185 for (i = 0, ii = 0; i < 4; i++, ii += 4) { 186 mdContext->digest[ii] = (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 bcopy((char *)mdContext->digest, (char *)hash, 16); 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, UL(3614090360)); /* 1 */ 209 FF ( d, a, b, c, in[ 1], S12, UL(3905402710)); /* 2 */ 210 FF ( c, d, a, b, in[ 2], S13, UL( 606105819)); /* 3 */ 211 FF ( b, c, d, a, in[ 3], S14, UL(3250441966)); /* 4 */ 212 FF ( a, b, c, d, in[ 4], S11, UL(4118548399)); /* 5 */ 213 FF ( d, a, b, c, in[ 5], S12, UL(1200080426)); /* 6 */ 214 FF ( c, d, a, b, in[ 6], S13, UL(2821735955)); /* 7 */ 215 FF ( b, c, d, a, in[ 7], S14, UL(4249261313)); /* 8 */ 216 FF ( a, b, c, d, in[ 8], S11, UL(1770035416)); /* 9 */ 217 FF ( d, a, b, c, in[ 9], S12, UL(2336552879)); /* 10 */ 218 FF ( c, d, a, b, in[10], S13, UL(4294925233)); /* 11 */ 219 FF ( b, c, d, a, in[11], S14, UL(2304563134)); /* 12 */ 220 FF ( a, b, c, d, in[12], S11, UL(1804603682)); /* 13 */ 221 FF ( d, a, b, c, in[13], S12, UL(4254626195)); /* 14 */ 222 FF ( c, d, a, b, in[14], S13, UL(2792965006)); /* 15 */ 223 FF ( b, c, d, a, in[15], S14, UL(1236535329)); /* 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, UL(4129170786)); /* 17 */ 231 GG ( d, a, b, c, in[ 6], S22, UL(3225465664)); /* 18 */ 232 GG ( c, d, a, b, in[11], S23, UL( 643717713)); /* 19 */ 233 GG ( b, c, d, a, in[ 0], S24, UL(3921069994)); /* 20 */ 234 GG ( a, b, c, d, in[ 5], S21, UL(3593408605)); /* 21 */ 235 GG ( d, a, b, c, in[10], S22, UL( 38016083)); /* 22 */ 236 GG ( c, d, a, b, in[15], S23, UL(3634488961)); /* 23 */ 237 GG ( b, c, d, a, in[ 4], S24, UL(3889429448)); /* 24 */ 238 GG ( a, b, c, d, in[ 9], S21, UL( 568446438)); /* 25 */ 239 GG ( d, a, b, c, in[14], S22, UL(3275163606)); /* 26 */ 240 GG ( c, d, a, b, in[ 3], S23, UL(4107603335)); /* 27 */ 241 GG ( b, c, d, a, in[ 8], S24, UL(1163531501)); /* 28 */ 242 GG ( a, b, c, d, in[13], S21, UL(2850285829)); /* 29 */ 243 GG ( d, a, b, c, in[ 2], S22, UL(4243563512)); /* 30 */ 244 GG ( c, d, a, b, in[ 7], S23, UL(1735328473)); /* 31 */ 245 GG ( b, c, d, a, in[12], S24, UL(2368359562)); /* 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, UL(4294588738)); /* 33 */ 253 HH ( d, a, b, c, in[ 8], S32, UL(2272392833)); /* 34 */ 254 HH ( c, d, a, b, in[11], S33, UL(1839030562)); /* 35 */ 255 HH ( b, c, d, a, in[14], S34, UL(4259657740)); /* 36 */ 256 HH ( a, b, c, d, in[ 1], S31, UL(2763975236)); /* 37 */ 257 HH ( d, a, b, c, in[ 4], S32, UL(1272893353)); /* 38 */ 258 HH ( c, d, a, b, in[ 7], S33, UL(4139469664)); /* 39 */ 259 HH ( b, c, d, a, in[10], S34, UL(3200236656)); /* 40 */ 260 HH ( a, b, c, d, in[13], S31, UL( 681279174)); /* 41 */ 261 HH ( d, a, b, c, in[ 0], S32, UL(3936430074)); /* 42 */ 262 HH ( c, d, a, b, in[ 3], S33, UL(3572445317)); /* 43 */ 263 HH ( b, c, d, a, in[ 6], S34, UL( 76029189)); /* 44 */ 264 HH ( a, b, c, d, in[ 9], S31, UL(3654602809)); /* 45 */ 265 HH ( d, a, b, c, in[12], S32, UL(3873151461)); /* 46 */ 266 HH ( c, d, a, b, in[15], S33, UL( 530742520)); /* 47 */ 267 HH ( b, c, d, a, in[ 2], S34, UL(3299628645)); /* 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, UL(4096336452)); /* 49 */ 275 II ( d, a, b, c, in[ 7], S42, UL(1126891415)); /* 50 */ 276 II ( c, d, a, b, in[14], S43, UL(2878612391)); /* 51 */ 277 II ( b, c, d, a, in[ 5], S44, UL(4237533241)); /* 52 */ 278 II ( a, b, c, d, in[12], S41, UL(1700485571)); /* 53 */ 279 II ( d, a, b, c, in[ 3], S42, UL(2399980690)); /* 54 */ 280 II ( c, d, a, b, in[10], S43, UL(4293915773)); /* 55 */ 281 II ( b, c, d, a, in[ 1], S44, UL(2240044497)); /* 56 */ 282 II ( a, b, c, d, in[ 8], S41, UL(1873313359)); /* 57 */ 283 II ( d, a, b, c, in[15], S42, UL(4264355552)); /* 58 */ 284 II ( c, d, a, b, in[ 6], S43, UL(2734768916)); /* 59 */ 285 II ( b, c, d, a, in[13], S44, UL(1309151649)); /* 60 */ 286 II ( a, b, c, d, in[ 4], S41, UL(4149444226)); /* 61 */ 287 II ( d, a, b, c, in[11], S42, UL(3174756917)); /* 62 */ 288 II ( c, d, a, b, in[ 2], S43, UL( 718787259)); /* 63 */ 289 II ( b, c, d, a, in[ 9], S44, UL(3951481745)); /* 64 */ 290 291 buf[0] += a; 292 buf[1] += b; 293 buf[2] += c; 294 buf[3] += d; 295 } 296 297 /* 298 *********************************************************************** 299 ** End of md5.c ** 300 ******************************** (cut) ******************************** 301 */ 302