pqc/external/flint-2.4.3/nmod_poly_mat/sqr_classical.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) 2011 Fredrik Johansson
******************************************************************************/
#include <stdlib.h>
#include "flint.h"
#include "nmod_poly.h"
#include "nmod_poly_mat.h"
static __inline__ void
nmod_poly_sqr(nmod_poly_t y, const nmod_poly_t x)
{
nmod_poly_mul(y, x, x);
}
#define E nmod_poly_mat_entry
void
nmod_poly_mat_sqr_classical(nmod_poly_mat_t B, const nmod_poly_mat_t A)
{
slong n = A->r;
if (n == 0)
return;
if (n == 1)
{
nmod_poly_sqr(E(B, 0, 0), E(A, 0, 0));
return;
}
if (n == 2)
{
nmod_poly_t t, u;
nmod_poly_init(t, nmod_poly_mat_modulus(A));
nmod_poly_init(u, nmod_poly_mat_modulus(A));
nmod_poly_add(t, E(A, 0, 0), E(A, 1, 1));
nmod_poly_mul(u, E(A, 0, 1), E(A, 1, 0));
nmod_poly_sqr(E(B, 0, 0), E(A, 0, 0));
nmod_poly_add(E(B, 0, 0), E(B, 0, 0), u);
nmod_poly_sqr(E(B, 1, 1), E(A, 1, 1));
nmod_poly_add(E(B, 1, 1), E(B, 1, 1), u);
nmod_poly_mul(E(B, 0, 1), E(A, 0, 1), t);
nmod_poly_mul(E(B, 1, 0), E(A, 1, 0), t);
nmod_poly_clear(t);
nmod_poly_clear(u);
return;
}
nmod_poly_mat_mul_classical(B, A, A);
}