1 /* MD4C.C - RSA Data Security, Inc., MD4 message-digest algorithm 2 */ 3 4 /*- 5 SPDX-License-Identifier: RSA-MD 6 7 Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved. 8 9 License to copy and use this software is granted provided that it 10 is identified as the "RSA Data Security, Inc. MD4 Message-Digest 11 Algorithm" in all material mentioning or referencing this software 12 or this function. 13 14 License is also granted to make and use derivative works provided 15 that such works are identified as "derived from the RSA Data 16 Security, Inc. MD4 Message-Digest Algorithm" in all material 17 mentioning or referencing the derived work. 18 19 RSA Data Security, Inc. makes no representations concerning either 20 the merchantability of this software or the suitability of this 21 software for any particular purpose. It is provided "as is" 22 without express or implied warranty of any kind. 23 24 These notices must be retained in any copies of any part of this 25 documentation and/or software. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/md4.h> 34 35 typedef unsigned char *POINTER; 36 typedef u_int16_t UINT2; 37 typedef u_int32_t UINT4; 38 39 #define PROTO_LIST(list) list 40 41 /* Constants for MD4Transform routine. 42 */ 43 #define S11 3 44 #define S12 7 45 #define S13 11 46 #define S14 19 47 #define S21 3 48 #define S22 5 49 #define S23 9 50 #define S24 13 51 #define S31 3 52 #define S32 9 53 #define S33 11 54 #define S34 15 55 56 static void MD4Transform PROTO_LIST ((UINT4 [4], const unsigned char [64])); 57 static void Encode PROTO_LIST 58 ((unsigned char *, UINT4 *, unsigned int)); 59 static void Decode PROTO_LIST 60 ((UINT4 *, const unsigned char *, unsigned int)); 61 62 static unsigned char PADDING[64] = { 63 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 64 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 65 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 66 }; 67 68 /* F, G and H are basic MD4 functions. 69 */ 70 #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) 71 #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z))) 72 #define H(x, y, z) ((x) ^ (y) ^ (z)) 73 74 /* ROTATE_LEFT rotates x left n bits. 75 */ 76 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 77 78 /* FF, GG and HH are transformations for rounds 1, 2 and 3 */ 79 /* Rotation is separate from addition to prevent recomputation */ 80 #define FF(a, b, c, d, x, s) { \ 81 (a) += F ((b), (c), (d)) + (x); \ 82 (a) = ROTATE_LEFT ((a), (s)); \ 83 } 84 #define GG(a, b, c, d, x, s) { \ 85 (a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; \ 86 (a) = ROTATE_LEFT ((a), (s)); \ 87 } 88 #define HH(a, b, c, d, x, s) { \ 89 (a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; \ 90 (a) = ROTATE_LEFT ((a), (s)); \ 91 } 92 93 /* MD4 initialization. Begins an MD4 operation, writing a new context. 94 */ 95 void 96 MD4Init(MD4_CTX *context) 97 { 98 context->count[0] = context->count[1] = 0; 99 100 /* Load magic initialization constants. 101 */ 102 context->state[0] = 0x67452301; 103 context->state[1] = 0xefcdab89; 104 context->state[2] = 0x98badcfe; 105 context->state[3] = 0x10325476; 106 } 107 108 /* MD4 block update operation. Continues an MD4 message-digest 109 operation, processing another message block, and updating the 110 context. 111 */ 112 void 113 MD4Update(MD4_CTX *context, const unsigned char *input, 114 unsigned int inputLen) 115 { 116 unsigned int i, index, partLen; 117 118 /* Compute number of bytes mod 64 */ 119 index = (unsigned int)((context->count[0] >> 3) & 0x3F); 120 /* Update number of bits */ 121 if ((context->count[0] += ((UINT4)inputLen << 3)) 122 < ((UINT4)inputLen << 3)) 123 context->count[1]++; 124 context->count[1] += ((UINT4)inputLen >> 29); 125 126 partLen = 64 - index; 127 /* Transform as many times as possible. 128 */ 129 if (inputLen >= partLen) { 130 bcopy(input, &context->buffer[index], partLen); 131 MD4Transform (context->state, context->buffer); 132 133 for (i = partLen; i + 63 < inputLen; i += 64) 134 MD4Transform (context->state, &input[i]); 135 136 index = 0; 137 } 138 else 139 i = 0; 140 141 /* Buffer remaining input */ 142 bcopy(&input[i], &context->buffer[index], inputLen-i); 143 } 144 145 /* MD4 padding. */ 146 void 147 MD4Pad(MD4_CTX *context) 148 { 149 unsigned char bits[8]; 150 unsigned int index, padLen; 151 152 /* Save number of bits */ 153 Encode (bits, context->count, 8); 154 155 /* Pad out to 56 mod 64. 156 */ 157 index = (unsigned int)((context->count[0] >> 3) & 0x3f); 158 padLen = (index < 56) ? (56 - index) : (120 - index); 159 MD4Update (context, PADDING, padLen); 160 161 /* Append length (before padding) */ 162 MD4Update (context, bits, 8); 163 } 164 165 /* MD4 finalization. Ends an MD4 message-digest operation, writing the 166 the message digest and zeroizing the context. 167 */ 168 void 169 MD4Final(unsigned char digest[static 16], MD4_CTX *context) 170 { 171 /* Do padding */ 172 MD4Pad (context); 173 174 /* Store state in digest */ 175 Encode (digest, context->state, 16); 176 177 /* Zeroize sensitive information. 178 */ 179 bzero(context, sizeof (*context)); 180 } 181 182 /* MD4 basic transformation. Transforms state based on block. 183 */ 184 static void 185 MD4Transform(UINT4 state[4], const unsigned char block[64]) 186 { 187 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16]; 188 189 Decode (x, block, 64); 190 191 /* Round 1 */ 192 FF (a, b, c, d, x[ 0], S11); /* 1 */ 193 FF (d, a, b, c, x[ 1], S12); /* 2 */ 194 FF (c, d, a, b, x[ 2], S13); /* 3 */ 195 FF (b, c, d, a, x[ 3], S14); /* 4 */ 196 FF (a, b, c, d, x[ 4], S11); /* 5 */ 197 FF (d, a, b, c, x[ 5], S12); /* 6 */ 198 FF (c, d, a, b, x[ 6], S13); /* 7 */ 199 FF (b, c, d, a, x[ 7], S14); /* 8 */ 200 FF (a, b, c, d, x[ 8], S11); /* 9 */ 201 FF (d, a, b, c, x[ 9], S12); /* 10 */ 202 FF (c, d, a, b, x[10], S13); /* 11 */ 203 FF (b, c, d, a, x[11], S14); /* 12 */ 204 FF (a, b, c, d, x[12], S11); /* 13 */ 205 FF (d, a, b, c, x[13], S12); /* 14 */ 206 FF (c, d, a, b, x[14], S13); /* 15 */ 207 FF (b, c, d, a, x[15], S14); /* 16 */ 208 209 /* Round 2 */ 210 GG (a, b, c, d, x[ 0], S21); /* 17 */ 211 GG (d, a, b, c, x[ 4], S22); /* 18 */ 212 GG (c, d, a, b, x[ 8], S23); /* 19 */ 213 GG (b, c, d, a, x[12], S24); /* 20 */ 214 GG (a, b, c, d, x[ 1], S21); /* 21 */ 215 GG (d, a, b, c, x[ 5], S22); /* 22 */ 216 GG (c, d, a, b, x[ 9], S23); /* 23 */ 217 GG (b, c, d, a, x[13], S24); /* 24 */ 218 GG (a, b, c, d, x[ 2], S21); /* 25 */ 219 GG (d, a, b, c, x[ 6], S22); /* 26 */ 220 GG (c, d, a, b, x[10], S23); /* 27 */ 221 GG (b, c, d, a, x[14], S24); /* 28 */ 222 GG (a, b, c, d, x[ 3], S21); /* 29 */ 223 GG (d, a, b, c, x[ 7], S22); /* 30 */ 224 GG (c, d, a, b, x[11], S23); /* 31 */ 225 GG (b, c, d, a, x[15], S24); /* 32 */ 226 227 /* Round 3 */ 228 HH (a, b, c, d, x[ 0], S31); /* 33 */ 229 HH (d, a, b, c, x[ 8], S32); /* 34 */ 230 HH (c, d, a, b, x[ 4], S33); /* 35 */ 231 HH (b, c, d, a, x[12], S34); /* 36 */ 232 HH (a, b, c, d, x[ 2], S31); /* 37 */ 233 HH (d, a, b, c, x[10], S32); /* 38 */ 234 HH (c, d, a, b, x[ 6], S33); /* 39 */ 235 HH (b, c, d, a, x[14], S34); /* 40 */ 236 HH (a, b, c, d, x[ 1], S31); /* 41 */ 237 HH (d, a, b, c, x[ 9], S32); /* 42 */ 238 HH (c, d, a, b, x[ 5], S33); /* 43 */ 239 HH (b, c, d, a, x[13], S34); /* 44 */ 240 HH (a, b, c, d, x[ 3], S31); /* 45 */ 241 HH (d, a, b, c, x[11], S32); /* 46 */ 242 HH (c, d, a, b, x[ 7], S33); /* 47 */ 243 HH (b, c, d, a, x[15], S34); /* 48 */ 244 245 state[0] += a; 246 state[1] += b; 247 state[2] += c; 248 state[3] += d; 249 250 /* Zeroize sensitive information. 251 */ 252 bzero((POINTER)x, sizeof (x)); 253 } 254 255 /* Encodes input (UINT4) into output (unsigned char). Assumes len is 256 a multiple of 4. 257 */ 258 static void 259 Encode(unsigned char *output, UINT4 *input, unsigned int len) 260 { 261 unsigned int i, j; 262 263 for (i = 0, j = 0; j < len; i++, j += 4) { 264 output[j] = (unsigned char)(input[i] & 0xff); 265 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff); 266 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff); 267 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff); 268 } 269 } 270 271 /* Decodes input (unsigned char) into output (UINT4). Assumes len is 272 a multiple of 4. 273 */ 274 static void 275 Decode(UINT4 *output, const unsigned char *input, unsigned int len) 276 { 277 unsigned int i, j; 278 279 for (i = 0, j = 0; j < len; i++, j += 4) 280 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) | 281 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24); 282 } 283