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/* ecc-gost-gc256b.c
Copyright (C) 2016-2020 Dmitry Eremin-Solenikov
This file is part of GNU Nettle.
GNU Nettle is free software: you can redistribute it and/or
modify it under the terms of either:
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your
option) any later version.
or
* the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
or both in parallel, as here.
GNU Nettle 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
General Public License for more details.
You should have received copies of the GNU General Public License and
the GNU Lesser General Public License along with this program. If
not, see http://www.gnu.org/licenses/.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>
#include "ecc.h"
#include "ecc-internal.h"
#define USE_REDC 0
#include "ecc-gost-gc256b.h"
static void
ecc_gost_gc256b_modp (const struct ecc_modulo *m, mp_limb_t *rp, mp_limb_t *xp)
{
mp_size_t mn = m->size;
mp_limb_t hi;
hi = mpn_addmul_1(xp, xp + mn, mn, 0x269);
hi = sec_add_1 (xp, xp, mn, hi * 0x269);
hi = sec_add_1 (rp, xp, mn, hi * 0x269);
assert(hi == 0);
}
#define ecc_gost_gc256b_modp ecc_gost_gc256b_modp
#define ecc_gost_gc256b_modq ecc_mod
const struct ecc_curve _nettle_gost_gc256b =
{
{
256,
ECC_LIMB_SIZE,
ECC_BMODP_SIZE,
ECC_REDC_SIZE,
ECC_MOD_INV_ITCH (ECC_LIMB_SIZE),
0,
0,
ecc_p,
ecc_Bmodp,
ecc_Bmodp_shifted,
ecc_Bm2p,
ecc_redc_ppm1,
ecc_pp1h,
ecc_gost_gc256b_modp,
ecc_gost_gc256b_modp,
ecc_mod_inv,
NULL,
NULL,
},
{
256,
ECC_LIMB_SIZE,
ECC_BMODQ_SIZE,
0,
ECC_MOD_INV_ITCH (ECC_LIMB_SIZE),
0,
0,
ecc_q,
ecc_Bmodq,
ecc_Bmodq_shifted,
ecc_Bm2q,
NULL,
ecc_qp1h,
ecc_gost_gc256b_modq,
ecc_gost_gc256b_modq,
ecc_mod_inv,
NULL,
NULL,
},
USE_REDC,
ECC_PIPPENGER_K,
ECC_PIPPENGER_C,
ECC_ADD_JJA_ITCH (ECC_LIMB_SIZE),
ECC_ADD_JJJ_ITCH (ECC_LIMB_SIZE),
ECC_DUP_JJ_ITCH (ECC_LIMB_SIZE),
ECC_MUL_A_ITCH (ECC_LIMB_SIZE),
ECC_MUL_G_ITCH (ECC_LIMB_SIZE),
ECC_J_TO_A_ITCH (ECC_LIMB_SIZE, ECC_MOD_INV_ITCH(ECC_LIMB_SIZE)),
ecc_add_jja,
ecc_add_jjj,
ecc_dup_jj,
ecc_mul_a,
ecc_mul_g,
ecc_j_to_a,
ecc_b,
ecc_unit,
ecc_table
};
const struct ecc_curve *nettle_get_gost_gc256b(void)
{
return &_nettle_gost_gc256b;
}
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