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/* $OpenBSD: curve25519.h,v 1.2 2020/07/22 13:54:30 tobhe Exp $ */
/*
* Copyright (C) 2019-2020 Matt Dunwoodie <ncon@noconroy.net>
*
* Permission to use, copy, modify, and 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 _CURVE25519_H_
#define _CURVE25519_H_
#define CURVE25519_KEY_SIZE 32
int curve25519(uint8_t out[CURVE25519_KEY_SIZE],
const uint8_t scalar[CURVE25519_KEY_SIZE],
const uint8_t point[CURVE25519_KEY_SIZE]);
int curve25519_generate_public(uint8_t pub[CURVE25519_KEY_SIZE],
const uint8_t secret[CURVE25519_KEY_SIZE]);
static inline void
curve25519_clamp_secret(uint8_t secret[CURVE25519_KEY_SIZE])
{
secret[0] &= 248;
secret[31] = (secret[31] & 127) | 64;
}
static inline void
curve25519_generate_secret(uint8_t secret[CURVE25519_KEY_SIZE])
{
arc4random_buf(secret, CURVE25519_KEY_SIZE);
curve25519_clamp_secret(secret);
}
#endif /* _CURVE25519_H_ */
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