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/* ecc-point-mul.c */
/* nettle, low-level cryptographics library
*
* Copyright (C) 2013 Niels Möller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02111-1301, USA.
*/
/* Development of Nettle's ECC support was funded by the .SE Internet Fund. */
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>
#include "ecc.h"
#include "ecc-internal.h"
void
ecc_point_mul (struct ecc_point *r, const struct ecc_scalar *n,
const struct ecc_point *p)
{
mp_limb_t size = p->ecc->size;
mp_size_t itch = 3*size + ECC_MUL_A_ITCH (size);
mp_limb_t *scratch = gmp_alloc_limbs (itch);
assert (n->ecc == p->ecc);
assert (r->ecc == p->ecc);
ecc_mul_a (p->ecc, 1, scratch, n->p, p->p, scratch + 3*size);
ecc_j_to_a (r->ecc, 1, r->p, scratch, scratch + 3*size);
gmp_free_limbs (scratch, itch);
}
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