tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 OR MIT */
2/*
3 * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
4 */
5
6#ifndef CURVE25519_H
7#define CURVE25519_H
8
9#include <linux/types.h>
10#include <linux/random.h>
11
12enum curve25519_lengths {
13 CURVE25519_KEY_SIZE = 32
14};
15
16void curve25519_generic(u8 out[CURVE25519_KEY_SIZE],
17 const u8 scalar[CURVE25519_KEY_SIZE],
18 const u8 point[CURVE25519_KEY_SIZE]);
19
20bool __must_check curve25519(u8 mypublic[CURVE25519_KEY_SIZE],
21 const u8 secret[CURVE25519_KEY_SIZE],
22 const u8 basepoint[CURVE25519_KEY_SIZE]);
23
24bool __must_check curve25519_generate_public(u8 pub[CURVE25519_KEY_SIZE],
25 const u8 secret[CURVE25519_KEY_SIZE]);
26
27static inline void curve25519_clamp_secret(u8 secret[CURVE25519_KEY_SIZE])
28{
29 secret[0] &= 248;
30 secret[31] = (secret[31] & 127) | 64;
31}
32
33static inline void curve25519_generate_secret(u8 secret[CURVE25519_KEY_SIZE])
34{
35 get_random_bytes_wait(secret, CURVE25519_KEY_SIZE);
36 curve25519_clamp_secret(secret);
37}
38
39#endif /* CURVE25519_H */