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/param.h> 29 #include <sys/systm.h> 30 #include <sys/md4.h> 31 32 typedef unsigned char *POINTER; 33 typedef uint16_t UINT2; 34 typedef uint32_t UINT4; 35 36 #define PROTO_LIST(list) list 37 38 /* Constants for MD4Transform routine. 39 */ 40 #define S11 3 41 #define S12 7 42 #define S13 11 43 #define S14 19 44 #define S21 3 45 #define S22 5 46 #define S23 9 47 #define S24 13 48 #define S31 3 49 #define S32 9 50 #define S33 11 51 #define S34 15 52 53 static void MD4Transform PROTO_LIST ((UINT4 [4], const unsigned char [64])); 54 static void Encode PROTO_LIST 55 ((unsigned char *, UINT4 *, unsigned int)); 56 static void Decode PROTO_LIST 57 ((UINT4 *, const unsigned char *, unsigned int)); 58 59 static unsigned char PADDING[64] = { 60 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 61 0, 0, 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 63 }; 64 65 /* F, G and H are basic MD4 functions. 66 */ 67 #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) 68 #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z))) 69 #define H(x, y, z) ((x) ^ (y) ^ (z)) 70 71 /* ROTATE_LEFT rotates x left n bits. 72 */ 73 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 74 75 /* FF, GG and HH are transformations for rounds 1, 2 and 3 */ 76 /* Rotation is separate from addition to prevent recomputation */ 77 #define FF(a, b, c, d, x, s) { \ 78 (a) += F ((b), (c), (d)) + (x); \ 79 (a) = ROTATE_LEFT ((a), (s)); \ 80 } 81 #define GG(a, b, c, d, x, s) { \ 82 (a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; \ 83 (a) = ROTATE_LEFT ((a), (s)); \ 84 } 85 #define HH(a, b, c, d, x, s) { \ 86 (a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; \ 87 (a) = ROTATE_LEFT ((a), (s)); \ 88 } 89 90 /* MD4 initialization. Begins an MD4 operation, writing a new context. 91 */ 92 void 93 MD4Init(MD4_CTX *context) 94 { 95 context->count[0] = context->count[1] = 0; 96 97 /* Load magic initialization constants. 98 */ 99 context->state[0] = 0x67452301; 100 context->state[1] = 0xefcdab89; 101 context->state[2] = 0x98badcfe; 102 context->state[3] = 0x10325476; 103 } 104 105 /* MD4 block update operation. Continues an MD4 message-digest 106 operation, processing another message block, and updating the 107 context. 108 */ 109 void 110 MD4Update(MD4_CTX *context, const unsigned char *input, 111 unsigned int inputLen) 112 { 113 unsigned int i, index, partLen; 114 115 /* Compute number of bytes mod 64 */ 116 index = (unsigned int)((context->count[0] >> 3) & 0x3F); 117 /* Update number of bits */ 118 if ((context->count[0] += ((UINT4)inputLen << 3)) 119 < ((UINT4)inputLen << 3)) 120 context->count[1]++; 121 context->count[1] += ((UINT4)inputLen >> 29); 122 123 partLen = 64 - index; 124 /* Transform as many times as possible. 125 */ 126 if (inputLen >= partLen) { 127 bcopy(input, &context->buffer[index], partLen); 128 MD4Transform (context->state, context->buffer); 129 130 for (i = partLen; i + 63 < inputLen; i += 64) 131 MD4Transform (context->state, &input[i]); 132 133 index = 0; 134 } 135 else 136 i = 0; 137 138 /* Buffer remaining input */ 139 bcopy(&input[i], &context->buffer[index], inputLen-i); 140 } 141 142 /* MD4 padding. */ 143 void 144 MD4Pad(MD4_CTX *context) 145 { 146 unsigned char bits[8]; 147 unsigned int index, padLen; 148 149 /* Save number of bits */ 150 Encode (bits, context->count, 8); 151 152 /* Pad out to 56 mod 64. 153 */ 154 index = (unsigned int)((context->count[0] >> 3) & 0x3f); 155 padLen = (index < 56) ? (56 - index) : (120 - index); 156 MD4Update (context, PADDING, padLen); 157 158 /* Append length (before padding) */ 159 MD4Update (context, bits, 8); 160 } 161 162 /* MD4 finalization. Ends an MD4 message-digest operation, writing the 163 the message digest and zeroizing the context. 164 */ 165 void 166 MD4Final(unsigned char digest[static 16], MD4_CTX *context) 167 { 168 /* Do padding */ 169 MD4Pad (context); 170 171 /* Store state in digest */ 172 Encode (digest, context->state, 16); 173 174 /* Zeroize sensitive information. 175 */ 176 bzero(context, sizeof (*context)); 177 } 178 179 /* MD4 basic transformation. Transforms state based on block. 180 */ 181 static void 182 MD4Transform(UINT4 state[4], const unsigned char block[64]) 183 { 184 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16]; 185 186 Decode (x, block, 64); 187 188 /* Round 1 */ 189 FF (a, b, c, d, x[ 0], S11); /* 1 */ 190 FF (d, a, b, c, x[ 1], S12); /* 2 */ 191 FF (c, d, a, b, x[ 2], S13); /* 3 */ 192 FF (b, c, d, a, x[ 3], S14); /* 4 */ 193 FF (a, b, c, d, x[ 4], S11); /* 5 */ 194 FF (d, a, b, c, x[ 5], S12); /* 6 */ 195 FF (c, d, a, b, x[ 6], S13); /* 7 */ 196 FF (b, c, d, a, x[ 7], S14); /* 8 */ 197 FF (a, b, c, d, x[ 8], S11); /* 9 */ 198 FF (d, a, b, c, x[ 9], S12); /* 10 */ 199 FF (c, d, a, b, x[10], S13); /* 11 */ 200 FF (b, c, d, a, x[11], S14); /* 12 */ 201 FF (a, b, c, d, x[12], S11); /* 13 */ 202 FF (d, a, b, c, x[13], S12); /* 14 */ 203 FF (c, d, a, b, x[14], S13); /* 15 */ 204 FF (b, c, d, a, x[15], S14); /* 16 */ 205 206 /* Round 2 */ 207 GG (a, b, c, d, x[ 0], S21); /* 17 */ 208 GG (d, a, b, c, x[ 4], S22); /* 18 */ 209 GG (c, d, a, b, x[ 8], S23); /* 19 */ 210 GG (b, c, d, a, x[12], S24); /* 20 */ 211 GG (a, b, c, d, x[ 1], S21); /* 21 */ 212 GG (d, a, b, c, x[ 5], S22); /* 22 */ 213 GG (c, d, a, b, x[ 9], S23); /* 23 */ 214 GG (b, c, d, a, x[13], S24); /* 24 */ 215 GG (a, b, c, d, x[ 2], S21); /* 25 */ 216 GG (d, a, b, c, x[ 6], S22); /* 26 */ 217 GG (c, d, a, b, x[10], S23); /* 27 */ 218 GG (b, c, d, a, x[14], S24); /* 28 */ 219 GG (a, b, c, d, x[ 3], S21); /* 29 */ 220 GG (d, a, b, c, x[ 7], S22); /* 30 */ 221 GG (c, d, a, b, x[11], S23); /* 31 */ 222 GG (b, c, d, a, x[15], S24); /* 32 */ 223 224 /* Round 3 */ 225 HH (a, b, c, d, x[ 0], S31); /* 33 */ 226 HH (d, a, b, c, x[ 8], S32); /* 34 */ 227 HH (c, d, a, b, x[ 4], S33); /* 35 */ 228 HH (b, c, d, a, x[12], S34); /* 36 */ 229 HH (a, b, c, d, x[ 2], S31); /* 37 */ 230 HH (d, a, b, c, x[10], S32); /* 38 */ 231 HH (c, d, a, b, x[ 6], S33); /* 39 */ 232 HH (b, c, d, a, x[14], S34); /* 40 */ 233 HH (a, b, c, d, x[ 1], S31); /* 41 */ 234 HH (d, a, b, c, x[ 9], S32); /* 42 */ 235 HH (c, d, a, b, x[ 5], S33); /* 43 */ 236 HH (b, c, d, a, x[13], S34); /* 44 */ 237 HH (a, b, c, d, x[ 3], S31); /* 45 */ 238 HH (d, a, b, c, x[11], S32); /* 46 */ 239 HH (c, d, a, b, x[ 7], S33); /* 47 */ 240 HH (b, c, d, a, x[15], S34); /* 48 */ 241 242 state[0] += a; 243 state[1] += b; 244 state[2] += c; 245 state[3] += d; 246 247 /* Zeroize sensitive information. 248 */ 249 bzero((POINTER)x, sizeof (x)); 250 } 251 252 /* Encodes input (UINT4) into output (unsigned char). Assumes len is 253 a multiple of 4. 254 */ 255 static void 256 Encode(unsigned char *output, UINT4 *input, unsigned int len) 257 { 258 unsigned int i, j; 259 260 for (i = 0, j = 0; j < len; i++, j += 4) { 261 output[j] = (unsigned char)(input[i] & 0xff); 262 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff); 263 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff); 264 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff); 265 } 266 } 267 268 /* Decodes input (unsigned char) into output (UINT4). Assumes len is 269 a multiple of 4. 270 */ 271 static void 272 Decode(UINT4 *output, const unsigned char *input, unsigned int len) 273 { 274 unsigned int i, j; 275 276 for (i = 0, j = 0; j < len; i++, j += 4) 277 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) | 278 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24); 279 } 280