1/* MD4C.C - RSA Data Security, Inc., MD4 message-digest algorithm 2 */ 3 4#include <sys/cdefs.h> 5__FBSDID("$FreeBSD$"); 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/types.h> 29#include <string.h> 30#include "md4.h" 31 32typedef unsigned char *POINTER; 33typedef const unsigned char *CONST_POINTER; 34typedef u_int16_t UINT2; 35typedef 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 54static void MD4Transform PROTO_LIST ((UINT4 [4], const unsigned char [64])); 55static void Encode PROTO_LIST 56 ((unsigned char *, UINT4 *, unsigned int)); 57static void Decode PROTO_LIST 58 ((UINT4 *, const unsigned char *, unsigned int)); 59 60static 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 */ 93void MD4Init (context) 94MD4_CTX *context; /* 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 */ 110void MD4Update (context, in, inputLen) 111MD4_CTX *context; /* context */ 112const void *in; /* input block */ 113unsigned int inputLen; /* length of input block */ 114{ 115 unsigned int i, idx, partLen; 116 const unsigned char *input = in; 117 118 /* Compute number of bytes mod 64 */ 119 idx = (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 - idx; 127 /* Transform as many times as possible. 128 */ 129 if (inputLen >= partLen) { 130 memcpy 131 ((POINTER)&context->buffer[idx], (CONST_POINTER)input, partLen); 132 MD4Transform (context->state, context->buffer); 133 134 for (i = partLen; i + 63 < inputLen; i += 64) 135 MD4Transform (context->state, &input[i]); 136 137 idx = 0; 138 } 139 else 140 i = 0; 141 142 /* Buffer remaining input */ 143 memcpy 144 ((POINTER)&context->buffer[idx], (CONST_POINTER)&input[i], 145 inputLen-i); 146} 147 148/* MD4 padding. */ 149void MD4Pad (context) 150MD4_CTX *context; /* context */ 151{ 152 unsigned char bits[8]; 153 unsigned int idx, padLen; 154 155 /* Save number of bits */ 156 Encode (bits, context->count, 8); 157 158 /* Pad out to 56 mod 64. 159 */ 160 idx = (unsigned int)((context->count[0] >> 3) & 0x3f); 161 padLen = (idx < 56) ? (56 - idx) : (120 - idx); 162 MD4Update (context, PADDING, padLen); 163 164 /* Append length (before padding) */ 165 MD4Update (context, bits, 8); 166} 167 168/* MD4 finalization. Ends an MD4 message-digest operation, writing the 169 the message digest and zeroizing the context. 170 */ 171void MD4Final (digest, context) 172unsigned char digest[16]; /* message digest */ 173MD4_CTX *context; /* context */ 174{ 175 /* Do padding */ 176 MD4Pad (context); 177 178 /* Store state in digest */ 179 Encode (digest, context->state, 16); 180 181 /* Zeroize sensitive information. 182 */ 183 memset ((POINTER)context, 0, sizeof (*context)); 184} 185 186/* MD4 basic transformation. Transforms state based on block. 187 */ 188static void MD4Transform (state, block) 189UINT4 state[4]; 190const unsigned char block[64]; 191{ 192 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16]; 193 194 Decode (x, block, 64); 195 196 /* Round 1 */ 197 FF (a, b, c, d, x[ 0], S11); /* 1 */ 198 FF (d, a, b, c, x[ 1], S12); /* 2 */ 199 FF (c, d, a, b, x[ 2], S13); /* 3 */ 200 FF (b, c, d, a, x[ 3], S14); /* 4 */ 201 FF (a, b, c, d, x[ 4], S11); /* 5 */ 202 FF (d, a, b, c, x[ 5], S12); /* 6 */ 203 FF (c, d, a, b, x[ 6], S13); /* 7 */ 204 FF (b, c, d, a, x[ 7], S14); /* 8 */ 205 FF (a, b, c, d, x[ 8], S11); /* 9 */ 206 FF (d, a, b, c, x[ 9], S12); /* 10 */ 207 FF (c, d, a, b, x[10], S13); /* 11 */ 208 FF (b, c, d, a, x[11], S14); /* 12 */ 209 FF (a, b, c, d, x[12], S11); /* 13 */ 210 FF (d, a, b, c, x[13], S12); /* 14 */ 211 FF (c, d, a, b, x[14], S13); /* 15 */ 212 FF (b, c, d, a, x[15], S14); /* 16 */ 213 214 /* Round 2 */ 215 GG (a, b, c, d, x[ 0], S21); /* 17 */ 216 GG (d, a, b, c, x[ 4], S22); /* 18 */ 217 GG (c, d, a, b, x[ 8], S23); /* 19 */ 218 GG (b, c, d, a, x[12], S24); /* 20 */ 219 GG (a, b, c, d, x[ 1], S21); /* 21 */ 220 GG (d, a, b, c, x[ 5], S22); /* 22 */ 221 GG (c, d, a, b, x[ 9], S23); /* 23 */ 222 GG (b, c, d, a, x[13], S24); /* 24 */ 223 GG (a, b, c, d, x[ 2], S21); /* 25 */ 224 GG (d, a, b, c, x[ 6], S22); /* 26 */ 225 GG (c, d, a, b, x[10], S23); /* 27 */ 226 GG (b, c, d, a, x[14], S24); /* 28 */ 227 GG (a, b, c, d, x[ 3], S21); /* 29 */ 228 GG (d, a, b, c, x[ 7], S22); /* 30 */ 229 GG (c, d, a, b, x[11], S23); /* 31 */ 230 GG (b, c, d, a, x[15], S24); /* 32 */ 231 232 /* Round 3 */ 233 HH (a, b, c, d, x[ 0], S31); /* 33 */ 234 HH (d, a, b, c, x[ 8], S32); /* 34 */ 235 HH (c, d, a, b, x[ 4], S33); /* 35 */ 236 HH (b, c, d, a, x[12], S34); /* 36 */ 237 HH (a, b, c, d, x[ 2], S31); /* 37 */ 238 HH (d, a, b, c, x[10], S32); /* 38 */ 239 HH (c, d, a, b, x[ 6], S33); /* 39 */ 240 HH (b, c, d, a, x[14], S34); /* 40 */ 241 HH (a, b, c, d, x[ 1], S31); /* 41 */ 242 HH (d, a, b, c, x[ 9], S32); /* 42 */ 243 HH (c, d, a, b, x[ 5], S33); /* 43 */ 244 HH (b, c, d, a, x[13], S34); /* 44 */ 245 HH (a, b, c, d, x[ 3], S31); /* 45 */ 246 HH (d, a, b, c, x[11], S32); /* 46 */ 247 HH (c, d, a, b, x[ 7], S33); /* 47 */ 248 HH (b, c, d, a, x[15], S34); /* 48 */ 249 250 state[0] += a; 251 state[1] += b; 252 state[2] += c; 253 state[3] += d; 254 255 /* Zeroize sensitive information. 256 */ 257 memset ((POINTER)x, 0, sizeof (x)); 258} 259 260/* Encodes input (UINT4) into output (unsigned char). Assumes len is 261 a multiple of 4. 262 */ 263static void Encode (output, input, len) 264unsigned char *output; 265UINT4 *input; 266unsigned int len; 267{ 268 unsigned int i, j; 269 270 for (i = 0, j = 0; j < len; i++, j += 4) { 271 output[j] = (unsigned char)(input[i] & 0xff); 272 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff); 273 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff); 274 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff); 275 } 276} 277 278/* Decodes input (unsigned char) into output (UINT4). Assumes len is 279 a multiple of 4. 280 */ 281static void Decode (output, input, len) 282 283UINT4 *output; 284const unsigned char *input; 285unsigned int len; 286{ 287 unsigned int i, j; 288 289 for (i = 0, j = 0; j < len; i++, j += 4) 290 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) | 291 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24); 292} 293