spect.c

a very popular packet of cryptography tools,it encloses the most common used algorithm and protocols

/* spect.c -- the spectral test */

/*
Copyright 1999 Free Software Foundation, Inc.

This file is part of the GNU MP Library.

The GNU MP Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version.

The GNU MP Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
License for more details.

You should have received a copy of the GNU Lesser General Public License
along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA.
*/

/* T is upper dimension.  Z_A is the LC multiplier, which is
   relatively prime to Z_M, the LC modulus.  The result is put in
   rop[] with v[t] in rop[t-2]. */

/* BUGS: Due to lazy allocation scheme, maximum T is hard coded to MAXT. */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <math.h>
#include "gmp.h"

#include "gmpstat.h"

int g_debug = 0;

int
main (int argc, char *argv[])
{
  const char usage[] = "usage: spect [-d] a m n\n";
  int c;
  unsigned int n;
  mpz_t a, m;
  mpf_t res[GMP_SPECT_MAXT], res_min[GMP_SPECT_MAXT], f_tmp;
  register int f;


  mpz_init (a);
  mpz_init (m);
  for (f = 0; f < GMP_SPECT_MAXT; f++)
    {
      mpf_init (res[f]);
      mpf_init (res_min[f]);
    }
  mpf_init (f_tmp);
  mpf_set_ui (res_min[0], 32768); /* 2^15 */
  mpf_set_ui (res_min[1], 1024); /* 2^10 */
  mpf_set_ui (res_min[2], 256); /* 2^8 */
  mpf_set_ui (res_min[3], 64); /* 2^6 */
  mpf_set_ui (res_min[4], 32); /* 2^5 */

  while ((c = getopt (argc, argv, "dh")) != -1)
    switch (c)
      {
      case 'd':			/* debug */
	g_debug++;
	break;
      case 'h':
      default:
	fputs (usage, stderr);
	exit (1);
      }
  argc -= optind;
  argv += optind;

  if (argc < 3)
    {
      fputs (usage, stderr);
      exit (1);
    }

  mpz_set_str (a, argv[0], 0);
  mpz_set_str (m, argv[1], 0);
  n = (unsigned int) atoi (argv[2]);
  if (n + 1 > GMP_SPECT_MAXT)
    n = GMP_SPECT_MAXT + 1;

  spectral_test (res, n, a, m);

  for (f = 0; f < n - 1; f++)
    {
      /* print v */
      printf ("%d: v = ", f + 2);
      mpf_out_str (stdout, 10, 4, res[f]);

#ifdef PRINT_RAISED_BY_TWO_AS_WELL
      printf (" (^2 = ");
      mpf_mul (f_tmp, res[f], res[f]);
      mpf_out_str (stdout, 10, 4, f_tmp);
      printf (")");
#endif /* PRINT_RAISED_BY_TWO_AS_WELL */

      /* print merit */
      printf (" m = ");
      merit (f_tmp, f + 2, res[f], m);
      mpf_out_str (stdout, 10, 4, f_tmp);

      if (mpf_cmp (res[f], res_min[f]) < 0)
	printf ("\t*** v too low ***");
      if (mpf_get_d (f_tmp) < .1)
	printf ("\t*** merit too low ***");

      puts ("");
    }

  mpz_clear (a);
  mpz_clear (m);
  for (f = 0; f < GMP_SPECT_MAXT; f++)
    {
      mpf_clear (res[f]);
      mpf_clear (res_min[f]);
    }
  mpf_clear (f_tmp);

  return 0;
}


void 
debug_foo()
{
  if (0)
    {
      mpz_dump (0);
      mpf_dump (0);
    }
}