/* This file is part of libbrandt.
 * Copyright (C) 2016 GNUnet e.V.
 *
 * libbrandt is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 *
 * libbrandt 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 a copy of the GNU General Public License along with
 * libbrandt.  If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * @file crypto.h
 * @brief Interface of the crypto primitives.
 */

#ifndef _BRANDT_CRYPTO_H
#define _BRANDT_CRYPTO_H

#include <gcrypt.h>
#include <stdint.h>

/* --- RANDOM --- */


void brandt_rand_poll ();



/* --- HASHING --- */

struct brandt_hash_code {
	uint32_t bits[512 / 8 / sizeof (uint32_t)];   /* = 16 */
};

void brandt_hash (const void *block, size_t size, struct brandt_hash_code *ret);



/* --- MPI --- */

void brandt_mpi_print_unsigned (void *buf, size_t size, gcry_mpi_t val);
void brandt_mpi_scan_unsigned (gcry_mpi_t *result, const void *data,
                               size_t size);



/* --- ECDHE --- */

struct brandt_dhe_skey {
	unsigned char d[256 / 8];
};

struct brandt_dhe_pkey {
	unsigned char q_y[256 / 8];
};

void brandt_ecdhe_key_create (struct brandt_dhe_skey *priv);
void brandt_ecdhe_key_get_public (const struct brandt_dhe_skey *priv,
                                  struct brandt_dhe_pkey       *pub);
int brandt_ecdhe (const struct brandt_dhe_skey *priv,
                  const struct brandt_dhe_pkey *pub,
                  struct brandt_hash_code      *key_material);
void brandt_ecdhe_key_clear (struct brandt_dhe_skey *priv);

#endif /* ifndef _BRANDT_CRYPTO_H */