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/* ecc-modq.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 Internetfonden. */
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>
#include "ecc-internal.h"
/* Arithmetic mod q, the group order. */
void
ecc_modq_add (const struct ecc_curve *ecc, mp_limb_t *rp,
const mp_limb_t *ap, const mp_limb_t *bp)
{
mp_limb_t cy;
cy = mpn_add_n (rp, ap, bp, ecc->size);
cy = cnd_add_n (cy, rp, ecc->Bmodq, ecc->size);
cy = cnd_add_n (cy, rp, ecc->Bmodq, ecc->size);
assert (cy == 0);
}
void
ecc_modq_mul (const struct ecc_curve *ecc, mp_limb_t *rp,
const mp_limb_t *ap, const mp_limb_t *bp)
{
mpn_mul_n (rp, ap, bp, ecc->size);
ecc->modq (ecc, rp);
}
void
ecc_modq_inv (const struct ecc_curve *ecc, mp_limb_t *rp, mp_limb_t *ap,
mp_limb_t *scratch)
{
sec_modinv (rp, ap, ecc->size, ecc->q, ecc->qp1h, ecc->bit_size, scratch);
}
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