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

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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) 2009 William Hart
******************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <gmp.h>
#include "flint.h"
#include "ulong_extras.h"
int main(void)
{
int i, result;
FLINT_TEST_INIT(state);
flint_printf("powmod....");
fflush(stdout);
for (i = 0; i < 10000 * flint_test_multiplier(); i++)
{
mp_limb_t bits, a, d, r1, r2;
mpz_t a_m, d_m, r2_m;
mp_limb_signed_t exp;
mpz_init(a_m);
mpz_init(d_m);
mpz_init(r2_m);
bits = n_randint(state, FLINT_D_BITS) + 1;
d = n_randtest_bits(state, bits);
do
{
a = n_randtest(state) % d;
} while (n_gcd(d, a) != UWORD(1));
exp = n_randtest(state);
r1 = n_powmod(a, exp, d);
flint_mpz_set_ui(a_m, a);
flint_mpz_set_ui(d_m, d);
if (exp < WORD(0))
{
flint_mpz_powm_ui(r2_m, a_m, -exp, d_m);
mpz_invert(r2_m, r2_m, d_m);
} else
flint_mpz_powm_ui(r2_m, a_m, exp, d_m);
r2 = flint_mpz_get_ui(r2_m);
result = (r1 == r2);
if (!result)
{
flint_printf("FAIL:\n");
flint_printf("a = %wu, exp = %wd, d = %wu\n", a, exp, d);
flint_printf("r1 = %wu, r2 = %wu\n", r1, r2);
abort();
}
mpz_clear(a_m);
mpz_clear(d_m);
mpz_clear(r2_m);
}
FLINT_TEST_CLEANUP(state);
flint_printf("PASS\n");
return 0;
}