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diff --git a/node/HMAC.hpp b/node/HMAC.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_HMAC_HPP
+#define _ZT_HMAC_HPP
+
+#include <stdint.h>
+
+namespace ZeroTier {
+
+/**
+ * HMAC authenticator functions
+ */
+class HMAC
+{
+public:
+	/**
+	 * Compute HMAC-SHA256
+	 *
+	 * @param key Key bytes
+	 * @param klen Length of key
+	 * @param len Length of message
+	 * @param mac Buffer to receive 32-byte MAC
+	 */
+	static void sha256(const void *key,unsigned int klen,const void *message,unsigned int len,void *mac)
+		throw();
+};
+
+} // namespace ZeroTier
+
+#endif