md4.c

wm PNE 3.3 source code, running at more than vxworks6.x version.

/*
 * $Log: md4.c,v $
 * Revision 1.3  2003/01/16 18:18:55  josh
 * directory structure shifting
 *
 * Revision 1.2  2001/11/06 22:15:51  tneale
 * Fixed for newest file layout
 *
 * Revision 1.1.1.1  2001/11/05 17:48:39  tneale
 * Tornado shuffle
 *
 * Revision 1.4  2001/01/19 22:21:31  paul
 * Update copyright.
 *
 * Revision 1.3  2000/03/17 00:16:54  meister
 * Update copyright message
 *
 * Revision 1.2  1999/09/13 19:23:20  wes
 * Rename index to idx to squelch compiler warning
 *
 * Revision 1.1  1999/08/11 21:18:04  bala
 * MD4 functions
 *
 */

/* [clearcase]
modification history
-------------------
01b,20apr05,job  update copyright notices
01a,11dec03,job  fix copyright statements
*/


/* Epilogue changes for type names and CVS info only */

/* MD4C.C - RSA Data Security, Inc., MD4 message-digest algorithm
 */

/* Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved.

   License to copy and use this software is granted provided that it
   is identified as the "RSA Data Security, Inc. MD4 Message-Digest
   Algorithm" in all material mentioning or referencing this software
   or this function.

   License is also granted to make and use derivative works provided
   that such works are identified as "derived from the RSA Data
   Security, Inc. MD4 Message-Digest Algorithm" in all material
   mentioning or referencing the derived work.

   RSA Data Security, Inc. makes no representations concerning either
   the merchantability of this software or the suitability of this
   software for any particular purpose. It is provided "as is"
   without express or implied warranty of any kind.

   These notices must be retained in any copies of any part of this
   documentation and/or software.
 */
#ifndef EPILOGUE_INSTALL_H
#include <wrn/wm/common/install.h>
#endif

#if INSTALL_COMMON_MD4

#ifndef	EPILOGUE_TYPES_H
#include <wrn/wm/common/types.h>
#endif

#ifndef COMMON_CONFIG_H
#include <wrn/wm/common/config.h>
#endif

#ifndef COMMON_GLUE_H
#include <wrn/wm/common/glue.h>
#endif

#ifndef __MD4_INCLUDE__
#include <wrn/wm/common/md4.h>
#endif

/* Constants for MD4Transform routine.
 */
#define S11 3
#define S12 7
#define S13 11
#define S14 19
#define S21 3
#define S22 5
#define S23 9
#define S24 13
#define S31 3
#define S32 9
#define S33 11
#define S34 15

static void MD4Transform __((bits32_t [4], bits8_t [64]));
static void Encode __((bits8_t *, bits32_t *, bits32_t));
static void Decode __((bits32_t *, bits8_t *, bits32_t));

static bits8_t PADDING[64] = {
  0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};

/* F, G and H are basic MD4 functions.
 */
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))

/* ROTATE_LEFT rotates x left n bits.
 */
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* FF, GG and HH are transformations for rounds 1, 2 and 3 */
/* Rotation is separate from addition to prevent recomputation */

#define FF(a, b, c, d, x, s) { \
    (a) += F ((b), (c), (d)) + (x); \
    (a) = ROTATE_LEFT ((a), (s)); \
  }
#define GG(a, b, c, d, x, s) { \
    (a) += G ((b), (c), (d)) + (x) + (bits32_t)0x5a827999; \
    (a) = ROTATE_LEFT ((a), (s)); \
  }
#define HH(a, b, c, d, x, s) { \
    (a) += H ((b), (c), (d)) + (x) + (bits32_t)0x6ed9eba1; \
    (a) = ROTATE_LEFT ((a), (s)); \
  }

/* MD4 initialization. Begins an MD4 operation, writing a new context.
 */
void MD4Init (context)
MD4_CTX *context;                                        /* context */
{
  context->count[0] = context->count[1] = 0;

  /* Load magic initialization constants.
   */
  context->state[0] = 0x67452301;
  context->state[1] = 0xefcdab89;
  context->state[2] = 0x98badcfe;
  context->state[3] = 0x10325476;
}

/* MD4 block update operation. Continues an MD4 message-digest
     operation, processing another message block, and updating the
     context.
 */
void MD4Update (context, input, inputLen)
MD4_CTX *context;                                        /* context */
bits8_t *input;                                /* input block */
bits32_t inputLen;                     /* length of input block */
{
  bits32_t i, idx, partLen;

  /* Compute number of bytes mod 64 */
  idx = (bits32_t)((context->count[0] >> 3) & 0x3F);
  /* Update number of bits */
  if ((context->count[0] += ((bits32_t)inputLen << 3))
      < ((bits32_t)inputLen << 3))
    context->count[1]++;
  context->count[1] += ((bits32_t)inputLen >> 29);

  partLen = 64 - idx;

  /* Transform as many times as possible.
   */
  if (inputLen >= partLen) {
    MEMCPY(&context->buffer[idx], input, partLen);
    MD4Transform (context->state, context->buffer);

    for (i = partLen; i + 63 < inputLen; i += 64)
      MD4Transform (context->state, &input[i]);

    idx = 0;
  }
  else
    i = 0;

  /* Buffer remaining input */
  MEMCPY(&context->buffer[idx], &input[i],
     inputLen-i);
}

/* MD4 finalization. Ends an MD4 message-digest operation, writing the
     the message digest and zeroizing the context.
 */
void MD4Final (digest, context)
bits8_t digest[16];                         /* message digest */
MD4_CTX *context;                                        /* context */
{
  bits8_t bits[8];
  bits32_t idx, padLen;

  /* Save number of bits */
  Encode (bits, context->count, 8);

  /* Pad out to 56 mod 64.
   */
  idx = (bits32_t)((context->count[0] >> 3) & 0x3f);
  padLen = (idx < 56) ? (56 - idx) : (120 - idx);
  MD4Update (context, PADDING, padLen);

  /* Append length (before padding) */
  MD4Update (context, bits, 8);
  /* Store state in digest */
  Encode (digest, context->state, 16);

  /* Zeroize sensitive information.
   */
  MEMSET(context, 0, sizeof (*context));
}

/* MD4 basic transformation. Transforms state based on block.
 */
static void MD4Transform (state, block)
bits32_t state[4];
bits8_t block[64];
{
  bits32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];

  Decode (x, block, 64);

  /* Round 1 */
  FF (a, b, c, d, x[ 0], S11); /* 1 */
  FF (d, a, b, c, x[ 1], S12); /* 2 */
  FF (c, d, a, b, x[ 2], S13); /* 3 */
  FF (b, c, d, a, x[ 3], S14); /* 4 */
  FF (a, b, c, d, x[ 4], S11); /* 5 */
  FF (d, a, b, c, x[ 5], S12); /* 6 */
  FF (c, d, a, b, x[ 6], S13); /* 7 */
  FF (b, c, d, a, x[ 7], S14); /* 8 */
  FF (a, b, c, d, x[ 8], S11); /* 9 */
  FF (d, a, b, c, x[ 9], S12); /* 10 */
  FF (c, d, a, b, x[10], S13); /* 11 */
  FF (b, c, d, a, x[11], S14); /* 12 */
  FF (a, b, c, d, x[12], S11); /* 13 */
  FF (d, a, b, c, x[13], S12); /* 14 */
  FF (c, d, a, b, x[14], S13); /* 15 */
  FF (b, c, d, a, x[15], S14); /* 16 */

  /* Round 2 */
  GG (a, b, c, d, x[ 0], S21); /* 17 */
  GG (d, a, b, c, x[ 4], S22); /* 18 */
  GG (c, d, a, b, x[ 8], S23); /* 19 */
  GG (b, c, d, a, x[12], S24); /* 20 */
  GG (a, b, c, d, x[ 1], S21); /* 21 */
  GG (d, a, b, c, x[ 5], S22); /* 22 */
  GG (c, d, a, b, x[ 9], S23); /* 23 */
  GG (b, c, d, a, x[13], S24); /* 24 */
  GG (a, b, c, d, x[ 2], S21); /* 25 */
  GG (d, a, b, c, x[ 6], S22); /* 26 */
  GG (c, d, a, b, x[10], S23); /* 27 */
  GG (b, c, d, a, x[14], S24); /* 28 */
  GG (a, b, c, d, x[ 3], S21); /* 29 */
  GG (d, a, b, c, x[ 7], S22); /* 30 */
  GG (c, d, a, b, x[11], S23); /* 31 */
  GG (b, c, d, a, x[15], S24); /* 32 */

  /* Round 3 */
  HH (a, b, c, d, x[ 0], S31); /* 33 */
  HH (d, a, b, c, x[ 8], S32); /* 34 */
  HH (c, d, a, b, x[ 4], S33); /* 35 */
  HH (b, c, d, a, x[12], S34); /* 36 */
  HH (a, b, c, d, x[ 2], S31); /* 37 */
  HH (d, a, b, c, x[10], S32); /* 38 */
  HH (c, d, a, b, x[ 6], S33); /* 39 */
  HH (b, c, d, a, x[14], S34); /* 40 */
  HH (a, b, c, d, x[ 1], S31); /* 41 */
  HH (d, a, b, c, x[ 9], S32); /* 42 */
  HH (c, d, a, b, x[ 5], S33); /* 43 */
  HH (b, c, d, a, x[13], S34); /* 44 */
  HH (a, b, c, d, x[ 3], S31); /* 45 */
  HH (d, a, b, c, x[11], S32); /* 46 */
  HH (c, d, a, b, x[ 7], S33); /* 47 */
  HH (b, c, d, a, x[15], S34); /* 48 */

  state[0] += a;
  state[1] += b;
  state[2] += c;
  state[3] += d;

  /* Zeroize sensitive information.
   */
  MEMSET(x, 0, sizeof (x));
}

/* Encodes input (bits32_t) into output (bits8_t). Assumes len is
     a multiple of 4.
 */
static void Encode (output, input, len)
bits8_t *output;
bits32_t *input;
bits32_t len;
{
  bits32_t i, j;

  for (i = 0, j = 0; j < len; i++, j += 4) {
    output[j] = (bits8_t)(input[i] & 0xff);
    output[j+1] = (bits8_t)((input[i] >> 8) & 0xff);
    output[j+2] = (bits8_t)((input[i] >> 16) & 0xff);
    output[j+3] = (bits8_t)((input[i] >> 24) & 0xff);
  }
}

/* Decodes input (bits8_t) into output (bits32_t). Assumes len is
     a multiple of 4.
 */
static void Decode (output, input, len)

bits32_t *output;
bits8_t *input;
bits32_t len;
{
  bits32_t i, j;

  for (i = 0, j = 0; j < len; i++, j += 4)
    output[i] = ((bits32_t)input[j]) | (((bits32_t)input[j+1]) << 8) |
      (((bits32_t)input[j+2]) << 16) | (((bits32_t)input[j+3]) << 24);
}

#endif /* INSTALL_COMMON_MD4 */