+++ /dev/null
-/*
- ecdh.c -- Diffie-Hellman key exchange handling
- Copyright (C) 2014 Guus Sliepen <guus@meshlink.io>
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License along
- with this program; if not, write to the Free Software Foundation, Inc.,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-*/
-
-#include "../system.h"
-
-#include <openssl/err.h>
-#include <openssl/ec.h>
-#include <openssl/ecdh.h>
-#include <openssl/obj_mac.h>
-
-#define __TINC_ECDH_INTERNAL__
-typedef EC_KEY ecdh_t;
-
-#include "../ecdh.h"
-#include "../logger.h"
-#include "../utils.h"
-#include "../xalloc.h"
-
-ecdh_t *ecdh_generate_public(void *pubkey) {
- ecdh_t *ecdh = EC_KEY_new_by_curve_name(NID_secp521r1);
- if(!ecdh) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Generating EC key_by_curve_name failed: %s", ERR_error_string(ERR_get_error(), NULL));
- return false;
- }
-
- if(!EC_KEY_generate_key(ecdh)) {
- EC_KEY_free(ecdh);
- logger(DEBUG_ALWAYS, LOG_ERR, "Generating EC key failed: %s", ERR_error_string(ERR_get_error(), NULL));
- return NULL;
- }
-
- const EC_POINT *point = EC_KEY_get0_public_key(ecdh);
- if(!point) {
- EC_KEY_free(ecdh);
- logger(DEBUG_ALWAYS, LOG_ERR, "Getting public key failed: %s", ERR_error_string(ERR_get_error(), NULL));
- return NULL;
- }
-
- size_t result = EC_POINT_point2oct(EC_KEY_get0_group(ecdh), point, POINT_CONVERSION_COMPRESSED, pubkey, ECDH_SIZE, NULL);
- if(!result) {
- EC_KEY_free(ecdh);
- logger(DEBUG_ALWAYS, LOG_ERR, "Converting EC_POINT to binary failed: %s", ERR_error_string(ERR_get_error(), NULL));
- return NULL;
- }
-
- return ecdh;
-}
-
-bool ecdh_compute_shared(ecdh_t *ecdh, const void *pubkey, void *shared) {
- EC_POINT *point = EC_POINT_new(EC_KEY_get0_group(ecdh));
- if(!point) {
- logger(DEBUG_ALWAYS, LOG_ERR, "EC_POINT_new() failed: %s", ERR_error_string(ERR_get_error(), NULL));
- EC_KEY_free(ecdh);
- return false;
- }
-
- int result = EC_POINT_oct2point(EC_KEY_get0_group(ecdh), point, pubkey, ECDH_SIZE, NULL);
- if(!result) {
- EC_POINT_free(point);
- EC_KEY_free(ecdh);
- logger(DEBUG_ALWAYS, LOG_ERR, "Converting binary to EC_POINT failed: %s", ERR_error_string(ERR_get_error(), NULL));
- return false;
- }
-
- result = ECDH_compute_key(shared, ECDH_SIZE, point, ecdh, NULL);
- EC_POINT_free(point);
- EC_KEY_free(ecdh);
-
- if(!result) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Computing Elliptic Curve Diffie-Hellman shared key failed: %s", ERR_error_string(ERR_get_error(), NULL));
- return false;
- }
-
- return true;
-}
-
-void ecdh_free(ecdh_t *ecdh) {
- if(ecdh)
- EC_KEY_free(ecdh);
-}