Use Ed25519 keys.

[tinc] / src / ed25519 / ecdh.c

diff --git a/src/ed25519/ecdh.c b/src/ed25519/ecdh.c
new file mode 100644 (file)
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+++ b/src/ed25519/ecdh.c
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+/*
+    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);
+}