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/* ecc-a-to-j.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 the .SE Internet Fund. */
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include "ecc.h"
#include "ecc-internal.h"
void
ecc_a_to_j (const struct ecc_curve *ecc,
int initial,
mp_limb_t *r, const mp_limb_t *p)
{
if (ecc->use_redc && initial)
{
mpn_copyd (r + ecc->size, p, 2*ecc->size);
mpn_zero (r, ecc->size);
ecc->modp (ecc, r);
mpn_zero (r + ecc->size, ecc->size);
ecc->modp (ecc, r + ecc->size);
}
else if (r != p)
mpn_copyi (r, p, 2*ecc->size);
mpn_copyi (r + 2*ecc->size, ecc->unit, ecc->size);
}
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