pqc/external/flint-2.4.3/ulong_extras/test/t-discrete_log_bsgs.c

66 lines
1.9 KiB
C
Raw Normal View History

2014-05-18 22:03:37 +00:00
/*=============================================================================
This file is part of FLINT.
FLINT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
FLINT 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with FLINT; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
=============================================================================*/
/******************************************************************************
Copyright (C) 2013 Mike Hansen
******************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include "flint.h"
#include "ulong_extras.h"
int main(void)
{
int i;
FLINT_TEST_INIT(state);
flint_printf("discrete_log_bsgs....");
fflush(stdout);
flint_randinit(state);
for (i = 0; i < 1000; i++)
{
mp_limb_t p, root, b, d, result;
double pinv;
p = n_randprime(state, 20, 1);
pinv = n_precompute_inverse(p);
root = n_primitive_root_prime(p);
b = n_randint(state, p - 1) + 1;
d = n_discrete_log_bsgs(b, root, p);
result = n_powmod_precomp(root, d, p, pinv);
if (result != b)
{
flint_printf("FAIL:\n");
flint_printf("%wu ** (%wu) == %wu != %wu\n", root, d, result, b);
abort();
}
}
FLINT_TEST_CLEANUP(state);
flint_printf("PASS\n");
return 0;
}