69 lines
2.1 KiB
C
Executable File
69 lines
2.1 KiB
C
Executable File
/* $OpenBSD: curve25519.h,v 1.3 2019/05/11 15:55:52 tb Exp $ */
|
|
/*
|
|
* Copyright (c) 2015, Google Inc.
|
|
*
|
|
* Permission to use, copy, modify, and/or distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
|
|
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
|
|
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
|
|
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
|
|
#ifndef HEADER_CURVE25519_H
|
|
#define HEADER_CURVE25519_H
|
|
|
|
#include <stdint.h>
|
|
|
|
#include <openssl/opensslconf.h>
|
|
|
|
#if defined(__cplusplus)
|
|
extern "C" {
|
|
#endif
|
|
|
|
/*
|
|
* Curve25519.
|
|
*
|
|
* Curve25519 is an elliptic curve. See https://tools.ietf.org/html/rfc7748.
|
|
*/
|
|
|
|
/*
|
|
* X25519.
|
|
*
|
|
* X25519 is the Diffie-Hellman primitive built from curve25519. It is
|
|
* sometimes referred to as curve25519, but X25519 is a more precise name.
|
|
* See http://cr.yp.to/ecdh.html and https://tools.ietf.org/html/rfc7748.
|
|
*/
|
|
|
|
#define X25519_KEY_LENGTH 32
|
|
|
|
/*
|
|
* X25519_keypair sets |out_public_value| and |out_private_key| to a freshly
|
|
* generated, public/private key pair.
|
|
*/
|
|
void X25519_keypair(uint8_t out_public_value[X25519_KEY_LENGTH],
|
|
uint8_t out_private_key[X25519_KEY_LENGTH]);
|
|
|
|
/*
|
|
* X25519 writes a shared key to |out_shared_key| that is calculated from the
|
|
* given private key and the peer's public value. It returns one on success and
|
|
* zero on error.
|
|
*
|
|
* Don't use the shared key directly, rather use a KDF and also include the two
|
|
* public values as inputs.
|
|
*/
|
|
int X25519(uint8_t out_shared_key[X25519_KEY_LENGTH],
|
|
const uint8_t private_key[X25519_KEY_LENGTH],
|
|
const uint8_t peers_public_value[X25519_KEY_LENGTH]);
|
|
|
|
#if defined(__cplusplus)
|
|
} /* extern C */
|
|
#endif
|
|
|
|
#endif /* HEADER_CURVE25519_H */
|