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				/* SPDX-License-Identifier: GPL-2.0 OR MIT */
				/*
				* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
				*/

				#ifndef _ZINC_CURVE25519_H
				#define _ZINC_CURVE25519_H

				#include <sys/types.h>

				enum curve25519_lengths {
				CURVE25519_KEY_SIZE = 32
				};

				bool curve25519(uint8_t mypublic[CURVE25519_KEY_SIZE],
				const uint8_t secret[CURVE25519_KEY_SIZE],
				const uint8_t basepoint[CURVE25519_KEY_SIZE]);
				void curve25519_generate_secret(uint8_t secret[CURVE25519_KEY_SIZE]);
				bool 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;
				}

				#endif /* _ZINC_CURVE25519_H */