1 /* MD4C.C - RSA Data Security, Inc., MD4 message-digest algorithm 2 */ 3 4 /*- 5 Copyright (C) 1990-2, RSA Data Security, Inc. All 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. MD4 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. MD4 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 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD$"); 28 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/md4.h> 32 33 typedef unsigned char *POINTER; 34 typedef u_int16_t UINT2; 35 typedef u_int32_t UINT4; 36 37 #define PROTO_LIST(list) list 38 39 /* Constants for MD4Transform routine. 40 */ 41 #define S11 3 42 #define S12 7 43 #define S13 11 44 #define S14 19 45 #define S21 3 46 #define S22 5 47 #define S23 9 48 #define S24 13 49 #define S31 3 50 #define S32 9 51 #define S33 11 52 #define S34 15 53 54 static void MD4Transform PROTO_LIST ((UINT4 [4], const unsigned char [64])); 55 static void Encode PROTO_LIST 56 ((unsigned char *, UINT4 *, unsigned int)); 57 static void Decode PROTO_LIST 58 ((UINT4 *, const unsigned char *, unsigned int)); 59 60 static unsigned char PADDING[64] = { 61 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 62 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 63 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 64 }; 65 66 /* F, G and H are basic MD4 functions. 67 */ 68 #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) 69 #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z))) 70 #define H(x, y, z) ((x) ^ (y) ^ (z)) 71 72 /* ROTATE_LEFT rotates x left n bits. 73 */ 74 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 75 76 /* FF, GG and HH are transformations for rounds 1, 2 and 3 */ 77 /* Rotation is separate from addition to prevent recomputation */ 78 #define FF(a, b, c, d, x, s) { \ 79 (a) += F ((b), (c), (d)) + (x); \ 80 (a) = ROTATE_LEFT ((a), (s)); \ 81 } 82 #define GG(a, b, c, d, x, s) { \ 83 (a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; \ 84 (a) = ROTATE_LEFT ((a), (s)); \ 85 } 86 #define HH(a, b, c, d, x, s) { \ 87 (a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; \ 88 (a) = ROTATE_LEFT ((a), (s)); \ 89 } 90 91 /* MD4 initialization. Begins an MD4 operation, writing a new context. 92 */ 93 void 94 MD4Init(MD4_CTX *context) 95 { 96 context->count[0] = context->count[1] = 0; 97 98 /* Load magic initialization constants. 99 */ 100 context->state[0] = 0x67452301; 101 context->state[1] = 0xefcdab89; 102 context->state[2] = 0x98badcfe; 103 context->state[3] = 0x10325476; 104 } 105 106 /* MD4 block update operation. Continues an MD4 message-digest 107 operation, processing another message block, and updating the 108 context. 109 */ 110 void 111 MD4Update(MD4_CTX *context, const unsigned char *input, 112 unsigned int inputLen) 113 { 114 unsigned int i, index, partLen; 115 116 /* Compute number of bytes mod 64 */ 117 index = (unsigned int)((context->count[0] >> 3) & 0x3F); 118 /* Update number of bits */ 119 if ((context->count[0] += ((UINT4)inputLen << 3)) 120 < ((UINT4)inputLen << 3)) 121 context->count[1]++; 122 context->count[1] += ((UINT4)inputLen >> 29); 123 124 partLen = 64 - index; 125 /* Transform as many times as possible. 126 */ 127 if (inputLen >= partLen) { 128 bcopy(input, &context->buffer[index], partLen); 129 MD4Transform (context->state, context->buffer); 130 131 for (i = partLen; i + 63 < inputLen; i += 64) 132 MD4Transform (context->state, &input[i]); 133 134 index = 0; 135 } 136 else 137 i = 0; 138 139 /* Buffer remaining input */ 140 bcopy(&input[i], &context->buffer[index], inputLen-i); 141 } 142 143 /* MD4 padding. */ 144 void 145 MD4Pad(MD4_CTX *context) 146 { 147 unsigned char bits[8]; 148 unsigned int index, padLen; 149 150 /* Save number of bits */ 151 Encode (bits, context->count, 8); 152 153 /* Pad out to 56 mod 64. 154 */ 155 index = (unsigned int)((context->count[0] >> 3) & 0x3f); 156 padLen = (index < 56) ? (56 - index) : (120 - index); 157 MD4Update (context, PADDING, padLen); 158 159 /* Append length (before padding) */ 160 MD4Update (context, bits, 8); 161 } 162 163 /* MD4 finalization. Ends an MD4 message-digest operation, writing the 164 the message digest and zeroizing the context. 165 */ 166 void 167 MD4Final(unsigned char digest[static 16], MD4_CTX *context) 168 { 169 /* Do padding */ 170 MD4Pad (context); 171 172 /* Store state in digest */ 173 Encode (digest, context->state, 16); 174 175 /* Zeroize sensitive information. 176 */ 177 bzero(context, sizeof (*context)); 178 } 179 180 /* MD4 basic transformation. Transforms state based on block. 181 */ 182 static void 183 MD4Transform(UINT4 state[4], const unsigned char block[64]) 184 { 185 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16]; 186 187 Decode (x, block, 64); 188 189 /* Round 1 */ 190 FF (a, b, c, d, x[ 0], S11); /* 1 */ 191 FF (d, a, b, c, x[ 1], S12); /* 2 */ 192 FF (c, d, a, b, x[ 2], S13); /* 3 */ 193 FF (b, c, d, a, x[ 3], S14); /* 4 */ 194 FF (a, b, c, d, x[ 4], S11); /* 5 */ 195 FF (d, a, b, c, x[ 5], S12); /* 6 */ 196 FF (c, d, a, b, x[ 6], S13); /* 7 */ 197 FF (b, c, d, a, x[ 7], S14); /* 8 */ 198 FF (a, b, c, d, x[ 8], S11); /* 9 */ 199 FF (d, a, b, c, x[ 9], S12); /* 10 */ 200 FF (c, d, a, b, x[10], S13); /* 11 */ 201 FF (b, c, d, a, x[11], S14); /* 12 */ 202 FF (a, b, c, d, x[12], S11); /* 13 */ 203 FF (d, a, b, c, x[13], S12); /* 14 */ 204 FF (c, d, a, b, x[14], S13); /* 15 */ 205 FF (b, c, d, a, x[15], S14); /* 16 */ 206 207 /* Round 2 */ 208 GG (a, b, c, d, x[ 0], S21); /* 17 */ 209 GG (d, a, b, c, x[ 4], S22); /* 18 */ 210 GG (c, d, a, b, x[ 8], S23); /* 19 */ 211 GG (b, c, d, a, x[12], S24); /* 20 */ 212 GG (a, b, c, d, x[ 1], S21); /* 21 */ 213 GG (d, a, b, c, x[ 5], S22); /* 22 */ 214 GG (c, d, a, b, x[ 9], S23); /* 23 */ 215 GG (b, c, d, a, x[13], S24); /* 24 */ 216 GG (a, b, c, d, x[ 2], S21); /* 25 */ 217 GG (d, a, b, c, x[ 6], S22); /* 26 */ 218 GG (c, d, a, b, x[10], S23); /* 27 */ 219 GG (b, c, d, a, x[14], S24); /* 28 */ 220 GG (a, b, c, d, x[ 3], S21); /* 29 */ 221 GG (d, a, b, c, x[ 7], S22); /* 30 */ 222 GG (c, d, a, b, x[11], S23); /* 31 */ 223 GG (b, c, d, a, x[15], S24); /* 32 */ 224 225 /* Round 3 */ 226 HH (a, b, c, d, x[ 0], S31); /* 33 */ 227 HH (d, a, b, c, x[ 8], S32); /* 34 */ 228 HH (c, d, a, b, x[ 4], S33); /* 35 */ 229 HH (b, c, d, a, x[12], S34); /* 36 */ 230 HH (a, b, c, d, x[ 2], S31); /* 37 */ 231 HH (d, a, b, c, x[10], S32); /* 38 */ 232 HH (c, d, a, b, x[ 6], S33); /* 39 */ 233 HH (b, c, d, a, x[14], S34); /* 40 */ 234 HH (a, b, c, d, x[ 1], S31); /* 41 */ 235 HH (d, a, b, c, x[ 9], S32); /* 42 */ 236 HH (c, d, a, b, x[ 5], S33); /* 43 */ 237 HH (b, c, d, a, x[13], S34); /* 44 */ 238 HH (a, b, c, d, x[ 3], S31); /* 45 */ 239 HH (d, a, b, c, x[11], S32); /* 46 */ 240 HH (c, d, a, b, x[ 7], S33); /* 47 */ 241 HH (b, c, d, a, x[15], S34); /* 48 */ 242 243 state[0] += a; 244 state[1] += b; 245 state[2] += c; 246 state[3] += d; 247 248 /* Zeroize sensitive information. 249 */ 250 bzero((POINTER)x, sizeof (x)); 251 } 252 253 /* Encodes input (UINT4) into output (unsigned char). Assumes len is 254 a multiple of 4. 255 */ 256 static void 257 Encode(unsigned char *output, UINT4 *input, unsigned int len) 258 { 259 unsigned int i, j; 260 261 for (i = 0, j = 0; j < len; i++, j += 4) { 262 output[j] = (unsigned char)(input[i] & 0xff); 263 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff); 264 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff); 265 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff); 266 } 267 } 268 269 /* Decodes input (unsigned char) into output (UINT4). Assumes len is 270 a multiple of 4. 271 */ 272 static void 273 Decode(UINT4 *output, const unsigned char *input, unsigned int len) 274 { 275 unsigned int i, j; 276 277 for (i = 0, j = 0; j < len; i++, j += 4) 278 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) | 279 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24); 280 } 281