--- /dev/null
+/*
+ ecdh.c -- Diffie-Hellman key exchange handling
+ Copyright (C) 2011-2013 Guus Sliepen <guus@tinc-vpn.org>
+
+ 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 "ed25519.h"
+
+#define __TINC_ECDH_INTERNAL__
+typedef struct ecdh_t {
+ uint8_t private[64];
+} ecdh_t;
+
+#include "../crypto.h"
+#include "../ecdh.h"
+#include "../xalloc.h"
+
+ecdh_t *ecdh_generate_public(void *pubkey) {
+ ecdh_t *ecdh = xzalloc(sizeof *ecdh);
+
+ uint8_t seed[32];
+ randomize(seed, sizeof seed);
+ ed25519_create_keypair(pubkey, ecdh->private, seed);
+
+ return ecdh;
+}
+
+bool ecdh_compute_shared(ecdh_t *ecdh, const void *pubkey, void *shared) {
+ ed25519_key_exchange(shared, pubkey, ecdh->private);
+ free(ecdh);
+ return true;
+}
+
+void ecdh_free(ecdh_t *ecdh) {
+ free(ecdh);
+}