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_a_to_j (const struct ecc_curve *ecc,
35 mp_limb_t *r, const mp_limb_t *p)
37 if (ecc->use_redc && initial)
39 mpn_copyd (r + ecc->size, p, 2*ecc->size);
41 mpn_zero (r, ecc->size);
44 mpn_zero (r + ecc->size, ecc->size);
45 ecc->modp (ecc, r + ecc->size);
48 mpn_copyi (r, p, 2*ecc->size);
50 mpn_copyi (r + 2*ecc->size, ecc->unit, ecc->size);