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. */
30 #include "ecc-internal.h"
33 ecc_scalar_init (struct ecc_scalar *s, const struct ecc_curve *ecc)
36 s->p = gmp_alloc_limbs (ecc->size);
40 ecc_scalar_clear (struct ecc_scalar *s)
42 gmp_free_limbs (s->p, s->ecc->size);
46 ecc_scalar_set (struct ecc_scalar *s, const mpz_t z)
48 mp_size_t size = s->ecc->size;
50 if (mpz_sgn (z) <= 0 || mpz_limbs_cmp (z, s->ecc->q, size) >= 0)
53 mpz_limbs_copy (s->p, z, size);
58 ecc_scalar_get (const struct ecc_scalar *s, mpz_t z)
60 mpz_set_n (z, s->p, s->ecc->size);