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. */
31
#include "ecc-internal.h"
33
/* Arithmetic mod q, the group order. */
36
ecc_modq_add (const struct ecc_curve *ecc, mp_limb_t *rp,
37
const mp_limb_t *ap, const mp_limb_t *bp)
40
cy = mpn_add_n (rp, ap, bp, ecc->size);
41
cy = cnd_add_n (cy, rp, ecc->Bmodq, ecc->size);
42
cy = cnd_add_n (cy, rp, ecc->Bmodq, ecc->size);
47
ecc_modq_mul (const struct ecc_curve *ecc, mp_limb_t *rp,
48
const mp_limb_t *ap, const mp_limb_t *bp)
50
mpn_mul_n (rp, ap, bp, ecc->size);
55
ecc_modq_inv (const struct ecc_curve *ecc, mp_limb_t *rp, mp_limb_t *ap,
58
sec_modinv (rp, ap, ecc->size, ecc->q, ecc->qp1h, ecc->bit_size, scratch);