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/* ec-context.h - Private definitions for CONTEXT_TYPE_EC.
* 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
*/
#ifndef GCRY_EC_CONTEXT_H
#define GCRY_EC_CONTEXT_H
/* This context is used with all our EC functions. */
struct mpi_ec_ctx_s
{
enum gcry_mpi_ec_models model; /* The model describing this curve. */
enum ecc_dialects dialect; /* The ECC dialect used with the curve. */
int flags; /* Public key flags (not always used). */
unsigned int nbits; /* Number of bits. */
/* Domain parameters. Note that they may not all be set and if set
the MPIs may be flaged as constant. */
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. */
gcry_mpi_point_t G; /* Base point (generator). */
gcry_mpi_t n; /* Order of G. */
unsigned int h; /* Cofactor. */
/* The actual key. May not be set. */
gcry_mpi_point_t Q; /* Public key. */
gcry_mpi_t d; /* Private key. */
const char *name; /* Name of the curve. */
/* This structure is private to mpi/ec.c! */
struct {
struct {
unsigned int a_is_pminus3:1;
unsigned int two_inv_p:1;
} valid; /* Flags to help setting the helper vars below. */
int a_is_pminus3; /* True if A = P - 3. */
gcry_mpi_t two_inv_p;
mpi_barrett_t p_barrett;
/* Scratch variables. */
gcry_mpi_t scratch[11];
/* Helper for fast reduction. */
/* int nist_nbits; /\* If this is a NIST curve, the # of bits. *\/ */
/* gcry_mpi_t s[10]; */
/* gcry_mpi_t c; */
} t;
/* Curve specific computation routines for the field. */
void (* addm) (gcry_mpi_t w, gcry_mpi_t u, gcry_mpi_t v, mpi_ec_t ctx);
void (* subm) (gcry_mpi_t w, gcry_mpi_t u, gcry_mpi_t v, mpi_ec_t ec);
void (* mulm) (gcry_mpi_t w, gcry_mpi_t u, gcry_mpi_t v, mpi_ec_t ctx);
void (* pow2) (gcry_mpi_t w, const gcry_mpi_t b, mpi_ec_t ctx);
void (* mul2) (gcry_mpi_t w, gcry_mpi_t u, mpi_ec_t ctx);
};
/*-- mpi/ec.c --*/
void _gcry_mpi_ec_get_reset (mpi_ec_t ec);
/*-- cipher/ecc-curves.c --*/
gcry_mpi_t _gcry_ecc_get_mpi (const char *name, mpi_ec_t ec, int copy);
gcry_mpi_point_t _gcry_ecc_get_point (const char *name, mpi_ec_t ec);
gpg_err_code_t _gcry_ecc_set_mpi (const char *name,
gcry_mpi_t newvalue, mpi_ec_t ec);
gpg_err_code_t _gcry_ecc_set_point (const char *name,
gcry_mpi_point_t newvalue, mpi_ec_t ec);
/*-- cipher/ecc-misc.c --*/
gpg_err_code_t _gcry_ecc_sec_decodepoint (gcry_mpi_t value, mpi_ec_t ec,
mpi_point_t result);
gpg_err_code_t _gcry_ecc_mont_decodepoint (gcry_mpi_t pk, mpi_ec_t ctx,
mpi_point_t result);
/*-- cipher/ecc-eddsa.c --*/
gpg_err_code_t _gcry_ecc_eddsa_decodepoint (gcry_mpi_t pk, mpi_ec_t ctx,
mpi_point_t result,
unsigned char **r_encpk,
unsigned int *r_encpklen);
#endif /*GCRY_EC_CONTEXT_H*/