pqc/external/flint-2.4.3/fmpz/jacobi.c

61 lines
1.7 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) 2012 William Hart
******************************************************************************/
#include <gmp.h>
#include "flint.h"
#include "ulong_extras.h"
#include "fmpz.h"
int
fmpz_jacobi(const fmpz_t a, const fmpz_t p)
{
fmpz c = *p;
fmpz d = *a;
mpz_t t, u;
int r;
if (d == 0)
return 0;
if (c == 2)
return 1;
if (!COEFF_IS_MPZ(c) && !COEFF_IS_MPZ(d))
return n_jacobi(d, c);
if (COEFF_IS_MPZ(c) && COEFF_IS_MPZ(d))
return mpz_jacobi(COEFF_TO_PTR(d), COEFF_TO_PTR(c));
flint_mpz_init_set_readonly(t, a);
flint_mpz_init_set_readonly(u, p);
r = mpz_jacobi(t, u);
flint_mpz_clear_readonly(t);
flint_mpz_clear_readonly(u);
return r;
}