pqc/external/flint-2.4.3/nmod_poly_mat/sqr_KS.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"
#include "fmpz.h"
#include "fmpz_mat.h"
void
nmod_poly_mat_sqr_KS(nmod_poly_mat_t B, const nmod_poly_mat_t A)
{
slong i, j, n;
slong A_len;
mp_bitcnt_t bit_size;
fmpz_mat_t AA, BB;
n = A->r;
if (n == 0)
{
nmod_poly_mat_zero(B);
return;
}
A_len = nmod_poly_mat_max_length(A);
bit_size = 2 * FLINT_BIT_COUNT(nmod_poly_mat_modulus(A));
bit_size += FLINT_BIT_COUNT(A_len);
bit_size += FLINT_BIT_COUNT(n);
fmpz_mat_init(AA, n, n);
fmpz_mat_init(BB, n, n);
for (i = 0; i < n; i++)
for (j = 0; j < A->c; j++)
nmod_poly_bit_pack(fmpz_mat_entry(AA, i, j),
nmod_poly_mat_entry(A, i, j), bit_size);
/* Should use fmpz_mat_sqr */
fmpz_mat_mul(BB, AA, AA);
for (i = 0; i < n; i++)
for (j = 0; j < n; j++)
nmod_poly_bit_unpack(nmod_poly_mat_entry(B, i, j),
fmpz_mat_entry(BB, i, j), bit_size);
fmpz_mat_clear(AA);
fmpz_mat_clear(BB);
}