linux/include/crypto/curve25519.h

/* SPDX-License-Identifier: GPL-2.0 OR MIT */
/*
 * Copyright (C) 2015-2019 Jason A. Donenfeld <[email protected]>. All Rights Reserved.
 */

#ifndef CURVE25519_H
#define CURVE25519_H

#include <crypto/algapi.h> // For crypto_memneq.
#include <linux/types.h>
#include <linux/random.h>

enum curve25519_lengths { … };

extern const u8 curve25519_null_point[];
extern const u8 curve25519_base_point[];

void curve25519_generic(u8 out[CURVE25519_KEY_SIZE],
			const u8 scalar[CURVE25519_KEY_SIZE],
			const u8 point[CURVE25519_KEY_SIZE]);

void curve25519_arch(u8 out[CURVE25519_KEY_SIZE],
		     const u8 scalar[CURVE25519_KEY_SIZE],
		     const u8 point[CURVE25519_KEY_SIZE]);

void curve25519_base_arch(u8 pub[CURVE25519_KEY_SIZE],
			  const u8 secret[CURVE25519_KEY_SIZE]);

bool curve25519_selftest(void);

static inline
bool __must_check curve25519(u8 mypublic[CURVE25519_KEY_SIZE],
			     const u8 secret[CURVE25519_KEY_SIZE],
			     const u8 basepoint[CURVE25519_KEY_SIZE])
{ … }

static inline bool
__must_check curve25519_generate_public(u8 pub[CURVE25519_KEY_SIZE],
					const u8 secret[CURVE25519_KEY_SIZE])
{ … }

static inline void curve25519_clamp_secret(u8 secret[CURVE25519_KEY_SIZE])
{ … }

static inline void curve25519_generate_secret(u8 secret[CURVE25519_KEY_SIZE])
{ … }

#endif /* CURVE25519_H */