Add new crypto: SHA512 and C25519 -- not integrated yet.

node/C25519.hpp

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+/*
+ * ZeroTier One - Global Peer to Peer Ethernet
+ * Copyright (C) 2012-2013  ZeroTier Networks LLC
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ * --
+ *
+ * ZeroTier may be used and distributed under the terms of the GPLv3, which
+ * are available at: http://www.gnu.org/licenses/gpl-3.0.html
+ *
+ * If you would like to embed ZeroTier into a commercial application or
+ * redistribute it in a modified binary form, please contact ZeroTier Networks
+ * LLC. Start here: http://www.zerotier.com/
+ */
+
+#ifndef _ZT_C25519_HPP
+#define _ZT_C25519_HPP
+
+#include "Array.hpp"
+
+namespace ZeroTier {
+
+/**
+ * C25519 elliptic curve key agreement and signing
+ */
+class C25519
+{
+public:
+	typedef Array<unsigned char,64> Public; // crypto key, signing key
+	typedef Array<unsigned char,96> Private; // crypto key, signing key (64 bytes)
+	typedef struct {
+		Public pub;
+		Private priv;
+	} Pair;
+
+	/**
+	 * Generate a C25519 elliptic curve key pair
+	 */
+	static Pair generate();
+
+	/**
+	 * Perform C25519 ECC key agreement
+	 *
+	 * Actual key bytes are generated from one or more SHA-512 digests of
+	 * the raw result of key agreement.
+	 *
+	 * @param mine My key pair including secret
+	 * @param their Their public key
+	 * @param keybuf Buffer to fill
+	 * @param keylen Number of key bytes to generate
+	 */
+	static void agree(const Pair &mine,const Public &their,void *keybuf,unsigned int keylen);
+};
+
+} // namespace ZeroTier
+
+#endif