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diff --git a/zto/node/Poly1305.hpp b/zto/node/Poly1305.hpp
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+/*
+ * ZeroTier One - Network Virtualization Everywhere
+ * Copyright (C) 2011-2016  ZeroTier, Inc.  https://www.zerotier.com/
+ *
+ * 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/>.
+ */
+
+#ifndef ZT_POLY1305_HPP
+#define ZT_POLY1305_HPP
+
+namespace ZeroTier {
+
+#define ZT_POLY1305_KEY_LEN 32
+#define ZT_POLY1305_MAC_LEN 16
+
+/**
+ * Poly1305 one-time authentication code
+ *
+ * This takes a one-time-use 32-byte key and generates a 16-byte message
+ * authentication code. The key must never be re-used for a different
+ * message.
+ *
+ * In Packet this is done by using the first 32 bytes of the stream cipher
+ * keystream as a one-time-use key. These 32 bytes are then discarded and
+ * the packet is encrypted with the next N bytes.
+ */
+class Poly1305
+{
+public:
+	/**
+	 * Compute a one-time authentication code
+	 *
+	 * @param auth Buffer to receive code -- MUST be 16 bytes in length
+	 * @param data Data to authenticate
+	 * @param len Length of data to authenticate in bytes
+	 * @param key 32-byte one-time use key to authenticate data (must not be reused)
+	 */
+	static void compute(void *auth,const void *data,unsigned int len,const void *key)
+		throw();
+};
+
+} // namespace ZeroTier
+
+#endif