kex: implement curve25519-sha256@libssh.org

include/libssh/curve25519.h

@@ -0,0 +1,46 @@
+/*
+ * This file is part of the SSH Library
+ *
+ * Copyright (c) 2013 by Aris Adamantiadis <aris@badcode.be>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation,
+ * version 2.1 of the License.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef CURVE25519_H_
+#define CURVE25519_H_
+
+#include "config.h"
+#include "libssh.h"
+
+#ifdef WITH_NACL
+
+#define HAVE_CURVE25519
+#include <nacl/crypto_scalarmult_curve25519.h>
+#define CURVE25519_PUBKEY_SIZE crypto_scalarmult_curve25519_BYTES
+#define CURVE25519_PRIVKEY_SIZE crypto_scalarmult_curve25519_SCALARBYTES
+
+typedef unsigned char ssh_curve25519_pubkey[CURVE25519_PUBKEY_SIZE];
+typedef unsigned char ssh_curve25519_privkey[CURVE25519_PRIVKEY_SIZE];
+
+#endif /* WITH_NACL */
+
+int ssh_client_curve25519_init(ssh_session session);
+int ssh_client_curve25519_reply(ssh_session session, ssh_buffer packet);
+
+#ifdef WITH_SERVER
+int ssh_server_curve25519_init(ssh_session session, ssh_buffer packet);
+#endif /* WITH_SERVER */
+
+#endif /* CURVE25519_H_ */