/*
 * ISC License
 *
 * Copyright (c) 2013-2019
 * Frank Denis <j at pureftpd dot org>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef x25519_ref10_H
#define x25519_ref10_H

#include <stddef.h>

#ifdef __cplusplus
extern "C" {
#endif

#define crypto_scalarmult_curve25519_BYTES 32U
size_t crypto_scalarmult_curve25519_bytes(void);

#define crypto_scalarmult_curve25519_SCALARBYTES 32U
size_t crypto_scalarmult_curve25519_scalarbytes(void);

/*
 * NOTE: Do not use the result of this function directly for key exchange.
 *
 * Hash the result with the public keys in order to compute a shared
 * secret key: H(q || client_pk || server_pk)
 *
 * Or unless this is not an option, use the crypto_kx() API instead.
 */
#define crypto_scalarmult_curve25519 hc_hcrypto_scalarmult_curve25519
int crypto_scalarmult_curve25519(unsigned char *q, const unsigned char *n,
                                 const unsigned char *p);

#define crypto_scalarmult_curve25519_base hc_hcrypto_scalarmult_curve25519_base
int crypto_scalarmult_curve25519_base(unsigned char *q,
                                      const unsigned char *n);

#ifdef __cplusplus
}
#endif

#endif