ecc-internal.h

/* ecc-internal.h */

/* 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. */

#ifndef NETTLE_ECC_INTERNAL_H_INCLUDED
#define NETTLE_ECC_INTERNAL_H_INCLUDED

#include <gmp.h>

#include "nettle-types.h"
#include "ecc-curve.h"
#include "gmp-glue.h"

/* Name mangling */
#define ecc_generic_modp _nettle_ecc_generic_modp
#define ecc_generic_redc _nettle_ecc_generic_redc
#define ecc_generic_modq _nettle_ecc_generic_modq
#define ecc_modp_add _nettle_ecc_modp_add
#define ecc_modp_sub _nettle_ecc_modp_sub
#define ecc_modp_sub_1 _nettle_ecc_modp_sub_1
#define ecc_modp_mul_1 _nettle_ecc_modp_mul_1
#define ecc_modp_addmul_1 _nettle_ecc_modp_addmul_1
#define ecc_modp_submul_1 _nettle_ecc_modp_submul_1
#define ecc_modp_mul _nettle_ecc_modp_mul
#define ecc_modp_sqr _nettle_ecc_modp_sqr
#define ecc_modp_inv _nettle_ecc_modp_inv
#define ecc_modq_mul _nettle_ecc_modq_mul
#define ecc_modq_add _nettle_ecc_modq_add
#define ecc_modq_inv _nettle_ecc_modq_inv
#define ecc_modq_random _nettle_ecc_modq_random
#define ecc_mod _nettle_ecc_mod
#define ecc_hash _nettle_ecc_hash
#define cnd_copy _nettle_cnd_copy
#define sec_add_1 _nettle_sec_add_1
#define sec_sub_1 _nettle_sec_sub_1
#define sec_tabselect _nettle_sec_tabselect
#define sec_modinv _nettle_sec_modinv

#define ECC_MAX_SIZE ((521 + GMP_NUMB_BITS - 1) / GMP_NUMB_BITS)

/* Window size for ecc_mul_a. Using 4 bits seems like a good choice,
   for both Intel x86_64 and ARM Cortex A9. For the larger curves, of
   384 and 521 bits, we could improve seepd by a few percent if we go
   up to 5 bits, but I don't think that's worth doubling the
   storage. */
#define ECC_MUL_A_WBITS 4

/* Reduces from 2*ecc->size to ecc->size. */
/* Required to return a result < 2q. This property is inherited by
   modp_mul and modp_add. */