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/* ecc-common.h - Declarations of common ECC code
* Copyright (C) 2013 g10 Code GmbH
*
* This file is part of Libgcrypt.
*
* Libgcrypt 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.
*
* Libgcrypt 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 this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef GCRY_ECC_COMMON_H
#define GCRY_ECC_COMMON_H
/* Definition of a curve. */
typedef struct
{
enum gcry_mpi_ec_models model;/* The model descrinbing this curve. */
gcry_mpi_t p; /* Prime specifying the field GF(p). */
gcry_mpi_t a; /* First coefficient of the Weierstrass equation. */
gcry_mpi_t b; /* Second coefficient of the Weierstrass equation.
or d as used by Twisted Edwards curves. */
mpi_point_struct G; /* Base point (generator). */
gcry_mpi_t n; /* Order of G. */
const char *name; /* Name of the curve or NULL. */
} elliptic_curve_t;
typedef struct
{
elliptic_curve_t E;
mpi_point_struct Q; /* Q = [d]G */
} ECC_public_key;
typedef struct
{
elliptic_curve_t E;
mpi_point_struct Q;
gcry_mpi_t d;
} ECC_secret_key;
/* Set the value from S into D. */
static inline void
point_set (mpi_point_t d, mpi_point_t s)
{
mpi_set (d->x, s->x);
mpi_set (d->y, s->y);
mpi_set (d->z, s->z);
}
/*-- ecc-curves.c --*/
gpg_err_code_t _gcry_ecc_fill_in_curve (unsigned int nbits,
const char *name,
elliptic_curve_t *curve,
unsigned int *r_nbits);
const char *_gcry_ecc_get_curve (gcry_mpi_t *pkey,
int iterator,
unsigned int *r_nbits);
gcry_err_code_t _gcry_ecc_get_param (const char *name, gcry_mpi_t *pkey);
gcry_sexp_t _gcry_ecc_get_param_sexp (const char *name);
/*-- ecc-misc.c --*/
void _gcry_ecc_curve_free (elliptic_curve_t *E);
elliptic_curve_t _gcry_ecc_curve_copy (elliptic_curve_t E);
const char *_gcry_ecc_model2str (enum gcry_mpi_ec_models model);
gcry_mpi_t _gcry_ecc_ec2os (gcry_mpi_t x, gcry_mpi_t y, gcry_mpi_t p);
gcry_error_t _gcry_ecc_os2ec (mpi_point_t result, gcry_mpi_t value);
#endif /*GCRY_ECC_COMMON_H*/
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