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/* ecdsa.h

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.

* 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/.
*/

/* Development of Nettle's ECC support was funded by the .SE Internet Fund. */

#ifndef NETTLE_ECDSA_H_INCLUDED
#define NETTLE_ECDSA_H_INCLUDED

#include "ecc.h"
#include "dsa.h"

#ifdef __cplusplus
extern "C" {
#endif

/* Name mangling */
#define ecdsa_sign nettle_ecdsa_sign
#define ecdsa_verify nettle_ecdsa_verify
#define ecdsa_generate_keypair nettle_ecdsa_generate_keypair
#define ecc_ecdsa_sign nettle_ecc_ecdsa_sign
#define ecc_ecdsa_sign_itch nettle_ecc_ecdsa_sign_itch
#define ecc_ecdsa_verify nettle_ecc_ecdsa_verify
#define ecc_ecdsa_verify_itch nettle_ecc_ecdsa_verify_itch

/* High level ECDSA functions.
 *
 * A public key is represented as a struct ecc_point, and a private
 * key as a struct ecc_scalar. FIXME: Introduce some aliases? */
void
ecdsa_sign (const struct ecc_scalar *key,
	    void *random_ctx, nettle_random_func *random,
	    size_t digest_length,
	    const uint8_t *digest,
	    struct dsa_signature *signature);

int
ecdsa_verify (const struct ecc_point *pub,
	      size_t length, const uint8_t *digest,
	      const struct dsa_signature *signature);

void
ecdsa_generate_keypair (struct ecc_point *pub,
			struct ecc_scalar *key,
			void *random_ctx, nettle_random_func *random);

/* Low-level ECDSA functions. */
mp_size_t
ecc_ecdsa_sign_itch (const struct ecc_curve *ecc);

void
ecc_ecdsa_sign (const struct ecc_curve *ecc,
		const mp_limb_t *zp,
		/* Random nonce, must be invertible mod ecc group
		   order. */
		const mp_limb_t *kp,
		size_t length, const uint8_t *digest,
		mp_limb_t *rp, mp_limb_t *sp,
		mp_limb_t *scratch);

mp_size_t
ecc_ecdsa_verify_itch (const struct ecc_curve *ecc);

int
ecc_ecdsa_verify (const struct ecc_curve *ecc,
		  const mp_limb_t *pp, /* Public key */
		  size_t length, const uint8_t *digest,
		  const mp_limb_t *rp, const mp_limb_t *sp,
		  mp_limb_t *scratch);

#ifdef __cplusplus
}
#endif

#endif /* NETTLE_ECDSA_H_INCLUDED */