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 12 enum curve25519_lengths { 13 CURVE25519_KEY_SIZE = 32 14 }; 15 16 void curve25519(uint8_t mypublic[static CURVE25519_KEY_SIZE], const uint8_t secret[static CURVE25519_KEY_SIZE], const uint8_t basepoint[static CURVE25519_KEY_SIZE]); 17 void curve25519_generate_public(uint8_t pub[static CURVE25519_KEY_SIZE], const uint8_t secret[static CURVE25519_KEY_SIZE]); 18 static 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