/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2021 The FreeBSD Foundation
*
* This software was developed by Ararat River Consulting, LLC under
* sponsorship from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef __CRYPTO_CURVE25519_H__
#define __CRYPTO_CURVE25519_H__
#include <sys/libkern.h>
#define CURVE25519_KEY_SIZE 32
bool curve25519(uint8_t *public, const uint8_t *secret,
const uint8_t *basepoint);
bool curve25519_generate_public(uint8_t *public,
const uint8_t *secret);
static __inline void
curve25519_clamp_secret(uint8_t *secret)
{
secret[0] &= 248;
secret[31] &= 127;
secret[31] |= 64;
}
static __inline void
curve25519_generate_secret(uint8_t *secret)
{
arc4random_buf(secret, CURVE25519_KEY_SIZE);
curve25519_clamp_secret(secret);
}
#endif /* __CRYPTO_CURVE25519_H__ */
