curve25519.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   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