1 /* 2 * MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm 3 * 4 * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All 5 * rights reserved. 6 * 7 * License to copy and use this software is granted provided that it 8 * is identified as the "RSA Data Security, Inc. MD5 Message-Digest 9 * Algorithm" in all material mentioning or referencing this software 10 * or this function. 11 * 12 * License is also granted to make and use derivative works provided 13 * that such works are identified as "derived from the RSA Data 14 * Security, Inc. MD5 Message-Digest Algorithm" in all material 15 * mentioning or referencing the derived work. 16 * 17 * RSA Data Security, Inc. makes no representations concerning either 18 * the merchantability of this software or the suitability of this 19 * software for any particular purpose. It is provided "as is" 20 * without express or implied warranty of any kind. 21 * 22 * These notices must be retained in any copies of any part of this 23 * documentation and/or software. 24 * 25 * $FreeBSD: src/sys/kern/md5c.c,v 1.27 2006/03/30 18:45:50 pjd Exp $ 26 * 27 * This code is the same as the code published by RSA Inc. It has been 28 * edited for clarity and style only. 29 */ 30 31 /* 32 * This file should be kept in sync with src/lib/libmd/md5c.c 33 */ 34 #include <sys/types.h> 35 36 #ifdef _KERNEL 37 #include <sys/systm.h> 38 #else 39 #include <string.h> 40 #endif 41 42 #include <machine/endian.h> 43 #include <sys/endian.h> 44 #include <sys/md5.h> 45 46 static void __kern__MD5Transform(u_int32_t [4], const unsigned char [64]); 47 48 #if (BYTE_ORDER == LITTLE_ENDIAN) 49 #define Encode memcpy 50 #define Decode memcpy 51 #else 52 53 /* 54 * Encodes input (u_int32_t) into output (unsigned char). Assumes len is 55 * a multiple of 4. 56 */ 57 58 static void 59 Encode (unsigned char *output, u_int32_t *input, unsigned int len) 60 { 61 unsigned int i; 62 uint32_t ip; 63 64 for (i = 0; i < len / 4; i++) { 65 ip = input[i]; 66 *output++ = ip; 67 *output++ = ip >> 8; 68 *output++ = ip >> 16; 69 *output++ = ip >> 24; 70 } 71 } 72 73 /* 74 * Decodes input (unsigned char) into output (u_int32_t). Assumes len is 75 * a multiple of 4. 76 */ 77 78 static void 79 Decode (u_int32_t *output, const unsigned char *input, unsigned int len) 80 { 81 unsigned int i; 82 83 for (i = 0; i < len; i += 4) { 84 *output++ = input[i] | (input[i+1] << 8) | (input[i+2] << 16) | 85 (input[i+3] << 24); 86 } 87 } 88 #endif 89 90 static unsigned char PADDING[64] = { 91 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 92 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 93 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 94 }; 95 96 /* F, G, H and I are basic MD5 functions. */ 97 #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) 98 #define G(x, y, z) (((x) & (z)) | ((y) & (~z))) 99 #define H(x, y, z) ((x) ^ (y) ^ (z)) 100 #define I(x, y, z) ((y) ^ ((x) | (~z))) 101 102 /* ROTATE_LEFT rotates x left n bits. */ 103 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 104 105 /* 106 * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. 107 * Rotation is separate from addition to prevent recomputation. 108 */ 109 #define FF(a, b, c, d, x, s, ac) { \ 110 (a) += F ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 111 (a) = ROTATE_LEFT ((a), (s)); \ 112 (a) += (b); \ 113 } 114 #define GG(a, b, c, d, x, s, ac) { \ 115 (a) += G ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 116 (a) = ROTATE_LEFT ((a), (s)); \ 117 (a) += (b); \ 118 } 119 #define HH(a, b, c, d, x, s, ac) { \ 120 (a) += H ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 121 (a) = ROTATE_LEFT ((a), (s)); \ 122 (a) += (b); \ 123 } 124 #define II(a, b, c, d, x, s, ac) { \ 125 (a) += I ((b), (c), (d)) + (x) + (u_int32_t)(ac); \ 126 (a) = ROTATE_LEFT ((a), (s)); \ 127 (a) += (b); \ 128 } 129 130 /* MD5 initialization. Begins an MD5 operation, writing a new context. */ 131 132 int 133 MD5Init (MD5_CTX *context) 134 { 135 136 context->Nl = context->Nh = 0; 137 138 /* Load magic initialization constants. */ 139 context->A = 0x67452301; 140 context->B = 0xefcdab89; 141 context->C = 0x98badcfe; 142 context->D = 0x10325476; 143 144 return 1; 145 } 146 147 /* 148 * MD5 block update operation. Continues an MD5 message-digest 149 * operation, processing another message block, and updating the 150 * context. 151 */ 152 153 void 154 MD5Update (MD5_CTX *context, const void *in, unsigned int inputLen) 155 { 156 unsigned int i, index, partLen; 157 const unsigned char *input = in; 158 159 /* Compute number of bytes mod 64 */ 160 index = (unsigned int)((context->Nl >> 3) & 0x3F); 161 162 /* Update number of bits */ 163 if ((context->Nl += ((u_int32_t)inputLen << 3)) 164 < ((u_int32_t)inputLen << 3)) 165 context->Nh++; 166 context->Nh += ((u_int32_t)inputLen >> 29); 167 168 partLen = 64 - index; 169 170 /* Transform as many times as possible. */ 171 if (inputLen >= partLen) { 172 memcpy((void *)&((char *)context->data)[index], (const void *)input, 173 partLen); 174 __kern__MD5Transform (&context->A, (char *)context->data); 175 176 for (i = partLen; i + 63 < inputLen; i += 64) 177 __kern__MD5Transform (&context->A, &input[i]); 178 179 index = 0; 180 } 181 else 182 i = 0; 183 184 /* Buffer remaining input */ 185 memcpy ((void *)&((char *)context->data)[index], (const void *)&input[i], 186 inputLen-i); 187 } 188 189 /* 190 * MD5 padding. Adds padding followed by original length. 191 */ 192 193 static void 194 __kern__MD5Pad (MD5_CTX *context) 195 { 196 unsigned char bits[8]; 197 unsigned int index, padLen; 198 199 /* Save number of bits */ 200 Encode (bits, &context->Nl, 8); 201 202 /* Pad out to 56 mod 64. */ 203 index = (unsigned int)((context->Nl >> 3) & 0x3f); 204 padLen = (index < 56) ? (56 - index) : (120 - index); 205 MD5Update (context, PADDING, padLen); 206 207 /* Append length (before padding) */ 208 MD5Update (context, bits, 8); 209 } 210 211 /* 212 * MD5 finalization. Ends an MD5 message-digest operation, writing the 213 * the message digest and zeroizing the context. 214 */ 215 216 void 217 MD5Final (unsigned char digest[16], MD5_CTX *context) 218 { 219 /* Do padding. */ 220 __kern__MD5Pad (context); 221 222 /* Store state in digest */ 223 Encode (digest, &context->A, 16); 224 225 /* Zeroize sensitive information. */ 226 memset ((void *)context, 0, sizeof (*context)); 227 } 228 229 /* MD5 basic transformation. Transforms state based on block. */ 230 231 static void 232 __kern__MD5Transform (u_int32_t state[4], const unsigned char block[64]) 233 { 234 u_int32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16]; 235 236 Decode (x, block, 64); 237 238 /* Round 1 */ 239 #define S11 7 240 #define S12 12 241 #define S13 17 242 #define S14 22 243 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */ 244 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */ 245 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */ 246 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */ 247 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */ 248 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */ 249 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */ 250 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */ 251 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */ 252 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */ 253 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ 254 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ 255 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ 256 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ 257 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ 258 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ 259 260 /* Round 2 */ 261 #define S21 5 262 #define S22 9 263 #define S23 14 264 #define S24 20 265 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */ 266 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */ 267 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ 268 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */ 269 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */ 270 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */ 271 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ 272 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */ 273 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */ 274 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ 275 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */ 276 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */ 277 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ 278 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */ 279 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */ 280 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ 281 282 /* Round 3 */ 283 #define S31 4 284 #define S32 11 285 #define S33 16 286 #define S34 23 287 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */ 288 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */ 289 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ 290 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ 291 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */ 292 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */ 293 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */ 294 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ 295 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ 296 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */ 297 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */ 298 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */ 299 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */ 300 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ 301 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ 302 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */ 303 304 /* Round 4 */ 305 #define S41 6 306 #define S42 10 307 #define S43 15 308 #define S44 21 309 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */ 310 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */ 311 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ 312 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */ 313 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ 314 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */ 315 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ 316 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */ 317 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */ 318 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ 319 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */ 320 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ 321 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */ 322 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ 323 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */ 324 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */ 325 326 state[0] += a; 327 state[1] += b; 328 state[2] += c; 329 state[3] += d; 330 331 /* Zeroize sensitive information. */ 332 memset ((void *)x, 0, sizeof (x)); 333 } 334