1/* SPDX-License-Identifier: GPL-2.0 OR MIT */
2/*
3 * Copyright (C) 2015-2020 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
4 */
5
6#ifndef CURVE25519_H
7#define CURVE25519_H
8
9#include <stdint.h>
10#include <sys/types.h>
11
12enum curve25519_lengths {
13	CURVE25519_KEY_SIZE = 32
14};
15
16void curve25519(uint8_t mypublic[static CURVE25519_KEY_SIZE], const uint8_t secret[static CURVE25519_KEY_SIZE], const uint8_t basepoint[static CURVE25519_KEY_SIZE]);
17void curve25519_generate_public(uint8_t pub[static CURVE25519_KEY_SIZE], const uint8_t secret[static CURVE25519_KEY_SIZE]);
18static inline void curve25519_clamp_secret(uint8_t secret[static CURVE25519_KEY_SIZE])
19{
20	secret[0] &= 248;
21	secret[31] = (secret[31] & 127) | 64;
22}
23
24#endif
25