/* SPDX-License-Identifier: GPL-2.0 OR MIT */ /* * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. */ #ifndef CURVE25519_H #define CURVE25519_H #include <linux/types.h> #include <linux/random.h> enum curve25519_lengths { CURVE25519_KEY_SIZE = 32 }; void curve25519_generic(u8 out[at_least CURVE25519_KEY_SIZE], const u8 scalar[at_least CURVE25519_KEY_SIZE], const u8 point[at_least CURVE25519_KEY_SIZE]); bool __must_check curve25519(u8 mypublic[at_least CURVE25519_KEY_SIZE], const u8 secret[at_least CURVE25519_KEY_SIZE], const u8 basepoint[at_least CURVE25519_KEY_SIZE]); bool __must_check curve25519_generate_public(u8 pub[at_least CURVE25519_KEY_SIZE], const u8 secret[at_least CURVE25519_KEY_SIZE]); static inline void curve25519_clamp_secret(u8 secret[at_least CURVE25519_KEY_SIZE]) { secret[0] &= 248; secret[31] = (secret[31] & 127) | 64; } static inline void curve25519_generate_secret(u8 secret[at_least CURVE25519_KEY_SIZE]) { get_random_bytes_wait(secret, CURVE25519_KEY_SIZE); curve25519_clamp_secret(secret); } #endif /* CURVE25519_H */