94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/*=============================================================================
|
|
|
|
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) 2011 Sebastian Pancratz
|
|
|
|
******************************************************************************/
|
|
|
|
#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("sqrtmod....");
|
|
fflush(stdout);
|
|
|
|
|
|
|
|
for (i = 0; i < 1000 * flint_test_multiplier(); i++) /* Test random integers */
|
|
{
|
|
mp_limb_t a, b, p, pinv;
|
|
|
|
p = n_randtest_prime(state, 0);
|
|
a = n_randtest(state) % p;
|
|
|
|
b = n_sqrtmod(a, p);
|
|
pinv = n_preinvert_limb(p);
|
|
|
|
result = (b == 0 || n_mulmod2_preinv(b, b, p, pinv) == a);
|
|
if (!result)
|
|
{
|
|
flint_printf("FAIL:\n");
|
|
flint_printf("p = %wu\n", p);
|
|
flint_printf("a = %wu\n", a);
|
|
flint_printf("b = %wu\n", b);
|
|
abort();
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < 1000 * flint_test_multiplier(); i++) /* Test random squares */
|
|
{
|
|
mp_limb_t a, b, p, pinv;
|
|
|
|
p = n_randtest_prime(state, 0);
|
|
|
|
do
|
|
b = n_randtest(state) % p;
|
|
while (b == 0);
|
|
|
|
pinv = n_preinvert_limb(p);
|
|
a = n_mulmod2_preinv(b, b, p, pinv);
|
|
|
|
b = n_sqrtmod(a, p);
|
|
|
|
result = (n_mulmod2_preinv(b, b, p, pinv) == a);
|
|
if (!result)
|
|
{
|
|
flint_printf("FAIL:\n");
|
|
flint_printf("p = %wu\n", p);
|
|
flint_printf("a = %wu\n", a);
|
|
flint_printf("b = %wu\n", b);
|
|
abort();
|
|
}
|
|
}
|
|
|
|
FLINT_TEST_CLEANUP(state);
|
|
|
|
flint_printf("PASS\n");
|
|
return 0;
|
|
}
|