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diff --git a/src/libradius/radius_socket.h b/src/libradius/radius_socket.h
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+/*
+ * Copyright (C) 2010 Martin Willi
+ * Copyright (C) 2010 revosec AG
+ *
+ * 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.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * 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.
+ */
+
+/**
+ * @defgroup radius_socket radius_socket
+ * @{ @ingroup libradius
+ */
+
+#ifndef RADIUS_SOCKET_H_
+#define RADIUS_SOCKET_H_
+
+typedef struct radius_socket_t radius_socket_t;
+
+#include "radius_message.h"
+
+#include <utils/host.h>
+
+/**
+ * RADIUS socket to a server.
+ */
+struct radius_socket_t {
+
+	/**
+	 * Send a RADIUS request, wait for response.
+	 *
+	 * The socket fills in RADIUS Message identifier, builds a
+	 * Request-Authenticator and calculates the Message-Authenticator
+	 * attribute.
+	 * The received response gets verified using the Response-Identifier
+	 * and the Message-Authenticator attribute.
+	 *
+	 * @param request		request message
+	 * @return				response message, NULL if timed out
+	 */
+	radius_message_t* (*request)(radius_socket_t *this,
+								 radius_message_t *request);
+
+	/**
+	 * Decrypt the MSK encoded in a messages MS-MPPE-Send/Recv-Key.
+	 *
+	 * @param request		associated RADIUS request message
+	 * @param response		RADIUS response message containing attributes
+	 * @return				allocated MSK, empty chunk if none found
+	 */
+	chunk_t (*decrypt_msk)(radius_socket_t *this, radius_message_t *request,
+						   radius_message_t *response);
+
+	/**
+	 * Destroy a radius_socket_t.
+	 */
+	void (*destroy)(radius_socket_t *this);
+};
+
+/**
+ * Create a radius_socket instance.
+ *
+ * @param address	server name
+ * @param auth_port	server port for authentication
+ * @param acct_port	server port for accounting
+ * @param secret	RADIUS secret
+ */
+radius_socket_t *radius_socket_create(char *address, u_int16_t auth_port,
+									  u_int16_t acct_port, chunk_t secret);
+
+#endif /** RADIUS_SOCKET_H_ @}*/