pqc/external/flint-2.4.3/fmpz_poly/test/t-hensel_lift_once.c
2014-05-24 23:16:06 +02:00

133 lines
3.9 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 William Hart
Copyright (C) 2011 Sebastian Pancratz
******************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <gmp.h>
#include "flint.h"
#include "fmpz.h"
#include "fmpz_poly.h"
#include "nmod_poly.h"
#include "ulong_extras.h"
int
main(void)
{
int i, result;
FLINT_TEST_INIT(state);
flint_printf("hensel_lift_once....");
fflush(stdout);
/* We check that lifting local factors of F yields factors */
for (i = 0; i < 100 * flint_test_multiplier(); i++)
{
fmpz_poly_t F, G, H, R;
fmpz_poly_factor_t F_fac;
nmod_poly_factor_t f_fac;
slong bits, nbits, n, exp, j;
bits = n_randint(state, 200) + 1;
nbits = n_randint(state, FLINT_BITS - 6) + 6;
fmpz_poly_init(F);
fmpz_poly_init(G);
fmpz_poly_init(H);
fmpz_poly_init(R);
nmod_poly_factor_init(f_fac);
fmpz_poly_factor_init(F_fac);
n = n_randprime(state, nbits, 0);
exp = bits / (FLINT_BIT_COUNT(n) - 1) + 1;
/* Produce F as the product of random G and H */
{
nmod_poly_t f;
nmod_poly_init(f, n);
do {
do {
fmpz_poly_randtest(G, state, n_randint(state, 200) + 2, bits);
} while (G->length < 2);
fmpz_randtest_not_zero(G->coeffs, state, bits);
fmpz_one(fmpz_poly_lead(G));
do {
fmpz_poly_randtest(H, state, n_randint(state, 200) + 2, bits);
} while (H->length < 2);
fmpz_randtest_not_zero(H->coeffs, state, bits);
fmpz_one(fmpz_poly_lead(H));
fmpz_poly_mul(F, G, H);
fmpz_poly_get_nmod_poly(f, F);
} while (!nmod_poly_is_squarefree(f));
fmpz_poly_get_nmod_poly(f, G);
nmod_poly_factor_insert(f_fac, f, 1);
fmpz_poly_get_nmod_poly(f, H);
nmod_poly_factor_insert(f_fac, f, 1);
nmod_poly_clear(f);
}
fmpz_poly_hensel_lift_once(F_fac, F, f_fac, exp);
result = 1;
for (j = 0; j < F_fac->num; j++)
{
fmpz_poly_rem(R, F, F_fac->p + j);
result &= (R->length == 0);
}
if (!result)
{
flint_printf("FAIL:\n");
flint_printf("bits = %wd, n = %wd, exp = %wd\n", bits, n, exp);
fmpz_poly_print(F); flint_printf("\n\n");
fmpz_poly_print(G); flint_printf("\n\n");
fmpz_poly_print(H); flint_printf("\n\n");
fmpz_poly_factor_print(F_fac); flint_printf("\n\n");
abort();
}
nmod_poly_factor_clear(f_fac);
fmpz_poly_factor_clear(F_fac);
fmpz_poly_clear(F);
fmpz_poly_clear(G);
fmpz_poly_clear(H);
fmpz_poly_clear(R);
}
FLINT_TEST_CLEANUP(state);
flint_printf("PASS\n");
return 0;
}