1 /* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm 2 * $FreeBSD$ 3 */ 4 5 /* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All 6 rights reserved. 7 8 License to copy and use this software is granted provided that it 9 is identified as the "RSA Data Security, Inc. MD5 Message-Digest 10 Algorithm" in all material mentioning or referencing this software 11 or this function. 12 13 License is also granted to make and use derivative works provided 14 that such works are identified as "derived from the RSA Data 15 Security, Inc. MD5 Message-Digest Algorithm" in all material 16 mentioning or referencing the derived work. 17 18 RSA Data Security, Inc. makes no representations concerning either 19 the merchantability of this software or the suitability of this 20 software for any particular purpose. It is provided "as is" 21 without express or implied warranty of any kind. 22 23 These notices must be retained in any copies of any part of this 24 documentation and/or software. 25 */ 26 27 #include "md5.h" 28 #include <string.h> 29 30 typedef unsigned char *POINTER; 31 typedef unsigned short int UINT2; 32 typedef unsigned long int UINT4; 33 34 #define PROTO_LIST(list) list 35 36 /* Constants for MD5Transform routine. 37 */ 38 #define S11 7 39 #define S12 12 40 #define S13 17 41 #define S14 22 42 #define S21 5 43 #define S22 9 44 #define S23 14 45 #define S24 20 46 #define S31 4 47 #define S32 11 48 #define S33 16 49 #define S34 23 50 #define S41 6 51 #define S42 10 52 #define S43 15 53 #define S44 21 54 55 static void MD5Transform PROTO_LIST ((UINT4 [4], const unsigned char [64])); 56 57 #ifdef i386 58 #define Encode memcpy 59 #define Decode memcpy 60 #else /* i386 */ 61 /* Encodes input (UINT4) into output (unsigned char). Assumes len is 62 a multiple of 4. 63 */ 64 static void Encode (output, input, len) 65 unsigned char *output; 66 UINT4 *input; 67 unsigned int len; 68 { 69 unsigned int i, j; 70 71 for (i = 0, j = 0; j < len; i++, j += 4) { 72 output[j] = (unsigned char)(input[i] & 0xff); 73 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff); 74 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff); 75 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff); 76 } 77 } 78 79 /* Decodes input (unsigned char) into output (UINT4). Assumes len is 80 a multiple of 4. 81 */ 82 static void Decode (output, input, len) 83 UINT4 *output; 84 const unsigned char *input; 85 unsigned int len; 86 { 87 unsigned int i, j; 88 89 for (i = 0, j = 0; j < len; i++, j += 4) 90 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) | 91 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24); 92 } 93 #endif /* i386 */ 94 95 static unsigned char PADDING[64] = { 96 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 97 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 98 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 99 }; 100 101 /* F, G, H and I are basic MD5 functions. 102 */ 103 #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) 104 #define G(x, y, z) (((x) & (z)) | ((y) & (~z))) 105 #define H(x, y, z) ((x) ^ (y) ^ (z)) 106 #define I(x, y, z) ((y) ^ ((x) | (~z))) 107 108 /* ROTATE_LEFT rotates x left n bits. 109 */ 110 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 111 112 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. 113 Rotation is separate from addition to prevent recomputation. 114 */ 115 #define FF(a, b, c, d, x, s, ac) { \ 116 (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \ 117 (a) = ROTATE_LEFT ((a), (s)); \ 118 (a) += (b); \ 119 } 120 #define GG(a, b, c, d, x, s, ac) { \ 121 (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \ 122 (a) = ROTATE_LEFT ((a), (s)); \ 123 (a) += (b); \ 124 } 125 #define HH(a, b, c, d, x, s, ac) { \ 126 (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \ 127 (a) = ROTATE_LEFT ((a), (s)); \ 128 (a) += (b); \ 129 } 130 #define II(a, b, c, d, x, s, ac) { \ 131 (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \ 132 (a) = ROTATE_LEFT ((a), (s)); \ 133 (a) += (b); \ 134 } 135 136 /* MD5 initialization. Begins an MD5 operation, writing a new context. 137 */ 138 void MD5Init (context) 139 MD5_CTX *context; /* context */ 140 { 141 context->count[0] = context->count[1] = 0; 142 /* Load magic initialization constants. 143 */ 144 context->state[0] = 0x67452301; 145 context->state[1] = 0xefcdab89; 146 context->state[2] = 0x98badcfe; 147 context->state[3] = 0x10325476; 148 } 149 150 /* MD5 block update operation. Continues an MD5 message-digest 151 operation, processing another message block, and updating the 152 context. 153 */ 154 void MD5Update (context, input, inputLen) 155 MD5_CTX *context; /* context */ 156 const unsigned char *input; /* input block */ 157 unsigned int inputLen; /* length of input block */ 158 { 159 unsigned int i, index, partLen; 160 161 /* Compute number of bytes mod 64 */ 162 index = (unsigned int)((context->count[0] >> 3) & 0x3F); 163 164 /* Update number of bits */ 165 if ((context->count[0] += ((UINT4)inputLen << 3)) 166 < ((UINT4)inputLen << 3)) 167 context->count[1]++; 168 context->count[1] += ((UINT4)inputLen >> 29); 169 170 partLen = 64 - index; 171 172 /* Transform as many times as possible. 173 */ 174 if (inputLen >= partLen) { 175 memcpy 176 ((POINTER)&context->buffer[index], (POINTER)input, partLen); 177 MD5Transform (context->state, context->buffer); 178 179 for (i = partLen; i + 63 < inputLen; i += 64) 180 MD5Transform (context->state, &input[i]); 181 182 index = 0; 183 } 184 else 185 i = 0; 186 187 /* Buffer remaining input */ 188 memcpy 189 ((POINTER)&context->buffer[index], (POINTER)&input[i], 190 inputLen-i); 191 } 192 193 /* MD5 finalization. Ends an MD5 message-digest operation, writing the 194 the message digest and zeroizing the context. 195 */ 196 void MD5Final (digest, context) 197 unsigned char digest[16]; /* message digest */ 198 MD5_CTX *context; /* context */ 199 { 200 unsigned char bits[8]; 201 unsigned int index, padLen; 202 203 /* Save number of bits */ 204 Encode (bits, context->count, 8); 205 206 /* Pad out to 56 mod 64. 207 */ 208 index = (unsigned int)((context->count[0] >> 3) & 0x3f); 209 padLen = (index < 56) ? (56 - index) : (120 - index); 210 MD5Update (context, PADDING, padLen); 211 212 /* Append length (before padding) */ 213 MD5Update (context, bits, 8); 214 /* Store state in digest */ 215 Encode (digest, context->state, 16); 216 217 /* Zeroize sensitive information. 218 */ 219 memset ((POINTER)context, 0, sizeof (*context)); 220 } 221 222 /* MD5 basic transformation. Transforms state based on block. 223 */ 224 static void MD5Transform (state, block) 225 UINT4 state[4]; 226 const unsigned char block[64]; 227 { 228 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16]; 229 230 Decode (x, block, 64); 231 232 /* Round 1 */ 233 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */ 234 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */ 235 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */ 236 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */ 237 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */ 238 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */ 239 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */ 240 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */ 241 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */ 242 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */ 243 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ 244 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ 245 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ 246 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ 247 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ 248 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ 249 250 /* Round 2 */ 251 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */ 252 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */ 253 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ 254 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */ 255 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */ 256 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */ 257 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ 258 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */ 259 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */ 260 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ 261 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */ 262 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */ 263 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ 264 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */ 265 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */ 266 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ 267 268 /* Round 3 */ 269 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */ 270 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */ 271 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ 272 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ 273 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */ 274 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */ 275 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */ 276 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ 277 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ 278 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */ 279 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */ 280 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */ 281 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */ 282 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ 283 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ 284 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */ 285 286 /* Round 4 */ 287 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */ 288 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */ 289 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ 290 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */ 291 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ 292 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */ 293 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ 294 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */ 295 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */ 296 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ 297 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */ 298 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ 299 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */ 300 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ 301 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */ 302 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */ 303 304 state[0] += a; 305 state[1] += b; 306 state[2] += c; 307 state[3] += d; 308 309 /* Zeroize sensitive information. 310 */ 311 memset ((POINTER)x, 0, sizeof (x)); 312 } 313 314