3 /* nettle, low-level cryptographics library
5 * Copyright (C) 2013 Niels Möller
7 * The nettle library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published by
9 * the Free Software Foundation; either version 2.1 of the License, or (at your
10 * option) any later version.
12 * The nettle library is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
15 * License for more details.
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with the nettle library; see the file COPYING.LIB. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
23 /* Development of Nettle's ECC support was funded by the .SE Internet Fund. */
32 #include "ecc-internal.h"
35 ecc_point_mul (struct ecc_point *r, const struct ecc_scalar *n,
36 const struct ecc_point *p)
38 mp_limb_t size = p->ecc->size;
39 mp_size_t itch = 3*size + ECC_MUL_A_ITCH (size);
40 mp_limb_t *scratch = gmp_alloc_limbs (itch);
42 assert (n->ecc == p->ecc);
43 assert (r->ecc == p->ecc);
45 ecc_mul_a (p->ecc, 1, scratch, n->p, p->p, scratch + 3*size);
46 ecc_j_to_a (r->ecc, 1, r->p, scratch, scratch + 3*size);
47 gmp_free_limbs (scratch, itch);