/* 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 . */ #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. */ enum ecc_dialects dialect; /* The dialect used with the 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); } #define point_init(a) _gcry_mpi_point_init ((a)) #define point_free(a) _gcry_mpi_point_free_parts ((a)) /*-- 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); gpg_err_code_t _gcry_ecc_update_curve_param (const char *name, enum gcry_mpi_ec_models *model, enum ecc_dialects *dialect, gcry_mpi_t *p, gcry_mpi_t *a, gcry_mpi_t *b, gcry_mpi_t *g, gcry_mpi_t *n); const char *_gcry_ecc_get_curve (gcry_sexp_t keyparms, int iterator, unsigned int *r_nbits); 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); const char *_gcry_ecc_dialect2str (enum ecc_dialects dialect); gcry_mpi_t _gcry_ecc_ec2os (gcry_mpi_t x, gcry_mpi_t y, gcry_mpi_t p); gcry_err_code_t _gcry_ecc_os2ec (mpi_point_t result, gcry_mpi_t value); mpi_point_t _gcry_ecc_compute_public (mpi_point_t Q, mpi_ec_t ec, mpi_point_t G, gcry_mpi_t d); /*-- ecc.c --*/ /*-- ecc-ecdsa.c --*/ gpg_err_code_t _gcry_ecc_ecdsa_sign (gcry_mpi_t input, ECC_secret_key *skey, gcry_mpi_t r, gcry_mpi_t s, int flags, int hashalgo); gpg_err_code_t _gcry_ecc_ecdsa_verify (gcry_mpi_t input, ECC_public_key *pkey, gcry_mpi_t r, gcry_mpi_t s); /*-- ecc-eddsa.c --*/ gpg_err_code_t _gcry_ecc_eddsa_recover_x (gcry_mpi_t x, gcry_mpi_t y, int sign, mpi_ec_t ec); gpg_err_code_t _gcry_ecc_eddsa_encodepoint (mpi_point_t point, mpi_ec_t ctx, gcry_mpi_t x, gcry_mpi_t y, int with_prefix, unsigned char **r_buffer, unsigned int *r_buflen); gpg_err_code_t _gcry_ecc_eddsa_ensure_compact (gcry_mpi_t value, unsigned int nbits); 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); gpg_err_code_t _gcry_ecc_eddsa_compute_h_d (unsigned char **r_digest, gcry_mpi_t d, mpi_ec_t ec); gpg_err_code_t _gcry_ecc_eddsa_genkey (ECC_secret_key *sk, elliptic_curve_t *E, mpi_ec_t ctx, gcry_random_level_t random_level); gpg_err_code_t _gcry_ecc_eddsa_sign (gcry_mpi_t input, ECC_secret_key *sk, gcry_mpi_t r_r, gcry_mpi_t s, int hashalgo, gcry_mpi_t pk); gpg_err_code_t _gcry_ecc_eddsa_verify (gcry_mpi_t input, ECC_public_key *pk, gcry_mpi_t r, gcry_mpi_t s, int hashalgo, gcry_mpi_t pkmpi); /*-- ecc-gost.c --*/ gpg_err_code_t _gcry_ecc_gost_sign (gcry_mpi_t input, ECC_secret_key *skey, gcry_mpi_t r, gcry_mpi_t s); gpg_err_code_t _gcry_ecc_gost_verify (gcry_mpi_t input, ECC_public_key *pkey, gcry_mpi_t r, gcry_mpi_t s); #endif /*GCRY_ECC_COMMON_H*/