common/lib/libc/md/md4c.c

   1 /*      $NetBSD: md4c.c,v 1.5 2012/03/20 16:21:41 matt Exp $    */
   2
   3 /*
   4  * This file is derived from the RSA Data Security, Inc. MD4 Message-Digest
   5  * Algorithm and has been modified by Jason R. Thorpe <thorpej@NetBSD.org>
   6  * for portability and formatting.
   7  */
   8
   9 /*
  10  * Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved.
  11  *
  12  * License to copy and use this software is granted provided that it
  13  * is identified as the "RSA Data Security, Inc. MD4 Message-Digest
  14  * Algorithm" in all material mentioning or referencing this software
  15  * or this function.
  16  *
  17  * License is also granted to make and use derivative works provided
  18  * that such works are identified as "derived from the RSA Data
  19  * Security, Inc. MD4 Message-Digest Algorithm" in all material
  20  * mentioning or referencing the derived work.
  21  *
  22  * RSA Data Security, Inc. makes no representations concerning either
  23  * the merchantability of this software or the suitability of this
  24  * software for any particular purpose. It is provided "as is"
  25  * without express or implied warranty of any kind.
  26  *
  27  * These notices must be retained in any copies of any part of this
  28  * documentation and/or software.
  29  */
  30
  31 #if !defined(_KERNEL) && !defined(_STANDALONE)
  32 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 __RCSID("$NetBSD: md4c.c,v 1.5 2012/03/20 16:21:41 matt Exp $");
  35 #endif /* LIBC_SCCS and not lint */
  36
  37 #include "namespace.h"
  38
  39 #include <sys/types.h>
  40
  41 #include <assert.h>
  42 #include <md4.h>
  43 #include <string.h>
  44
  45 #if HAVE_NBTOOL_CONFIG_H
  46 #include "nbtool_config.h"
  47 #endif
  48
  49 #else
  50
  51 #include <sys/param.h>
  52 #include <sys/md4.h>
  53 #include <lib/libkern/libkern.h>
  54
  55 #endif /* !_KERNEL && !_STANDALONE */
  56
  57 #if !HAVE_MD4_H
  58
  59 typedef unsigned char *POINTER;
  60 typedef uint16_t UINT2;
  61 typedef uint32_t UINT4;
  62
  63 /*
  64  * Constants for MD4Transform routine.
  65  */
  66 #define S11 3
  67 #define S12 7
  68 #define S13 11
  69 #define S14 19
  70 #define S21 3
  71 #define S22 5
  72 #define S23 9
  73 #define S24 13
  74 #define S31 3
  75 #define S32 9
  76 #define S33 11
  77 #define S34 15
  78
  79 static void MD4Transform(UINT4 [4], const unsigned char [64]);
  80
  81 static void Encode(unsigned char *, UINT4 *, unsigned int);
  82 static void Decode(UINT4 *, const unsigned char *, unsigned int);
  83
  84 static const unsigned char PADDING[64] = {
  85         0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  86         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  87         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
  88 };
  89
  90 /*
  91  * F, G and H are basic MD4 functions.
  92  */
  93 #define F(x, y, z)      (((x) & (y)) | ((~x) & (z)))
  94 #define G(x, y, z)      (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
  95 #define H(x, y, z)      ((x) ^ (y) ^ (z))
  96
  97 /*
  98  * ROTATE_LEFT rotates x left n bits.
  99  */
 100 #define ROTATE_LEFT(x, n)       (((x) << (n)) | ((x) >> (32-(n))))
 101
 102 /*
 103  * FF, GG and HH are transformations for rounds 1, 2 and 3.
 104  * Rotation is separate from addition to prevent recomputation.
 105  */
 106 #define FF(a, b, c, d, x, s) { \
 107         (a) += F ((b), (c), (d)) + (x); \
 108         (a) = ROTATE_LEFT ((a), (s)); \
 109 }
 110
 111 #define GG(a, b, c, d, x, s) { \
 112         (a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; \
 113         (a) = ROTATE_LEFT ((a), (s)); \
 114 }
 115
 116 #define HH(a, b, c, d, x, s) { \
 117         (a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; \
 118         (a) = ROTATE_LEFT ((a), (s)); \
 119 }
 120
 121 #if !defined(_KERNEL) && !defined(_STANDALONE) && defined(__weak_alias)
 122 __weak_alias(MD4Init,_MD4Init)
 123 __weak_alias(MD4Update,_MD4Update)
 124 __weak_alias(MD4Final,_MD4Final)
 125 __weak_alias(MD4Transform,_MD4Transform)
 126 #endif
 127
 128 /*
 129  * MD4 initialization. Begins an MD4 operation, writing a new context.
 130  */
 131 void
 132 MD4Init(MD4_CTX *context)               /* context */
 133 {
 134
 135         _DIAGASSERT(context != 0);
 136
 137         context->count[0] = context->count[1] = 0;
 138
 139         /* Load magic initialization constants. */
 140         context->state[0] = 0x67452301;
 141         context->state[1] = 0xefcdab89;
 142         context->state[2] = 0x98badcfe;
 143         context->state[3] = 0x10325476;
 144 }
 145
 146 /*
 147  * MD4 block update operation.  Continues an MD4 message-digest
 148  * operation, processing another message block, and updating the
 149  * context.
 150  */
 151 void
 152 MD4Update (MD4_CTX *context,            /* context */
 153         const unsigned char *input,     /* input block */
 154         unsigned int inputLen)          /* length of input block */
 155 {
 156         unsigned int i, idx, partLen;
 157
 158         _DIAGASSERT(context != 0);
 159         _DIAGASSERT(input != 0);
 160
 161         /* Compute number of bytes mod 64 */
 162         idx = (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 - idx;
 171
 172         /* Transform as many times as possible. */
 173         if (inputLen >= partLen) {
 174                 memcpy(&context->buffer[idx], input, partLen);
 175                 MD4Transform(context->state, context->buffer);
 176
 177                 for (i = partLen; i + 63 < inputLen; i += 64)
 178                         MD4Transform(context->state, &input[i]);
 179
 180                 idx = 0;
 181         } else
 182                 i = 0;
 183
 184         /* Buffer remaining input */
 185         memcpy(&context->buffer[idx], &input[i], inputLen - i);
 186 }
 187
 188 /*
 189  * MD4 finalization.  Ends an MD4 message-digest operation, writing the
 190  * message digest and zeroing the context.
 191  */
 192 void
 193 MD4Final (unsigned char digest[16],     /* message digest */
 194         MD4_CTX *context)               /* context */
 195 {
 196         unsigned char bits[8];
 197         unsigned int idx, padLen;
 198
 199         _DIAGASSERT(digest != 0);
 200         _DIAGASSERT(context != 0);
 201
 202         /* Save number of bits */
 203         Encode(bits, context->count, 8);
 204
 205         /* Pad out to 56 mod 64. */
 206         idx = (unsigned int)((context->count[0] >> 3) & 0x3f);
 207         padLen = (idx < 56) ? (56 - idx) : (120 - idx);
 208         MD4Update(context, PADDING, padLen);
 209
 210         /* Append length (before padding) */
 211         MD4Update(context, bits, 8);
 212
 213         /* Store state in digest */
 214         Encode(digest, context->state, 16);
 215
 216         /* Zeroize sensitive information. */
 217         memset(context, 0, sizeof(*context));
 218 }
 219
 220 /*
 221  * MD4 basic transformation.  Transforms state based on block.
 222  */
 223 static void
 224 MD4Transform (UINT4 state[4], const unsigned char block[64])
 225 {
 226         UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
 227
 228         Decode(x, block, 64);
 229
 230         /* Round 1 */
 231         FF (a, b, c, d, x[ 0], S11); /* 1 */
 232         FF (d, a, b, c, x[ 1], S12); /* 2 */
 233         FF (c, d, a, b, x[ 2], S13); /* 3 */
 234         FF (b, c, d, a, x[ 3], S14); /* 4 */
 235         FF (a, b, c, d, x[ 4], S11); /* 5 */
 236         FF (d, a, b, c, x[ 5], S12); /* 6 */
 237         FF (c, d, a, b, x[ 6], S13); /* 7 */
 238         FF (b, c, d, a, x[ 7], S14); /* 8 */
 239         FF (a, b, c, d, x[ 8], S11); /* 9 */
 240         FF (d, a, b, c, x[ 9], S12); /* 10 */
 241         FF (c, d, a, b, x[10], S13); /* 11 */
 242         FF (b, c, d, a, x[11], S14); /* 12 */
 243         FF (a, b, c, d, x[12], S11); /* 13 */
 244         FF (d, a, b, c, x[13], S12); /* 14 */
 245         FF (c, d, a, b, x[14], S13); /* 15 */
 246         FF (b, c, d, a, x[15], S14); /* 16 */
 247
 248         /* Round 2 */
 249         GG (a, b, c, d, x[ 0], S21); /* 17 */
 250         GG (d, a, b, c, x[ 4], S22); /* 18 */
 251         GG (c, d, a, b, x[ 8], S23); /* 19 */
 252         GG (b, c, d, a, x[12], S24); /* 20 */
 253         GG (a, b, c, d, x[ 1], S21); /* 21 */
 254         GG (d, a, b, c, x[ 5], S22); /* 22 */
 255         GG (c, d, a, b, x[ 9], S23); /* 23 */
 256         GG (b, c, d, a, x[13], S24); /* 24 */
 257         GG (a, b, c, d, x[ 2], S21); /* 25 */
 258         GG (d, a, b, c, x[ 6], S22); /* 26 */
 259         GG (c, d, a, b, x[10], S23); /* 27 */
 260         GG (b, c, d, a, x[14], S24); /* 28 */
 261         GG (a, b, c, d, x[ 3], S21); /* 29 */
 262         GG (d, a, b, c, x[ 7], S22); /* 30 */
 263         GG (c, d, a, b, x[11], S23); /* 31 */
 264         GG (b, c, d, a, x[15], S24); /* 32 */
 265
 266         /* Round 3 */
 267         HH (a, b, c, d, x[ 0], S31); /* 33 */
 268         HH (d, a, b, c, x[ 8], S32); /* 34 */
 269         HH (c, d, a, b, x[ 4], S33); /* 35 */
 270         HH (b, c, d, a, x[12], S34); /* 36 */
 271         HH (a, b, c, d, x[ 2], S31); /* 37 */
 272         HH (d, a, b, c, x[10], S32); /* 38 */
 273         HH (c, d, a, b, x[ 6], S33); /* 39 */
 274         HH (b, c, d, a, x[14], S34); /* 40 */
 275         HH (a, b, c, d, x[ 1], S31); /* 41 */
 276         HH (d, a, b, c, x[ 9], S32); /* 42 */
 277         HH (c, d, a, b, x[ 5], S33); /* 43 */
 278         HH (b, c, d, a, x[13], S34); /* 44 */
 279         HH (a, b, c, d, x[ 3], S31); /* 45 */
 280         HH (d, a, b, c, x[11], S32); /* 46 */
 281         HH (c, d, a, b, x[ 7], S33); /* 47 */
 282         HH (b, c, d, a, x[15], S34); /* 48 */
 283
 284         state[0] += a;
 285         state[1] += b;
 286         state[2] += c;
 287         state[3] += d;
 288
 289         /* Zeroize sensitive information. */
 290         memset(x, 0, sizeof (x));
 291 }
 292
 293 /*
 294  * Encodes input (UINT4) into output (unsigned char). Assumes len is
 295  * a multiple of 4.
 296  */
 297 static void
 298 Encode(unsigned char *output, UINT4 *input, unsigned int len)
 299 {
 300         unsigned int i, j;
 301
 302         for (i = 0, j = 0; j < len; i++, j += 4) {
 303                 output[j] = (unsigned char)(input[i] & 0xff);
 304                 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
 305                 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
 306                 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
 307         }
 308 }
 309
 310 /*
 311  * Decodes input (unsigned char) into output (UINT4). Assumes len is
 312  * a multiple of 4.
 313  */
 314 static void
 315 Decode(UINT4 *output, const unsigned char *input, unsigned int len)
 316 {
 317         unsigned int i, j;
 318
 319         for (i = 0, j = 0; j < len; i++, j += 4)
 320                 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
 321                     (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
 322 }
 323
 324 #endif /* HAVE_MD4_H */