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diff --git a/src/libstrongswan/credentials/keys/shared_key.h b/src/libstrongswan/credentials/keys/shared_key.h
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+/*
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * 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 shared_key shared_key
+ * @{ @ingroup keys
+ */
+
+#ifndef SHARED_KEY_H_
+#define SHARED_KEY_H_
+
+#include <utils/enumerator.h>
+#include <utils/identification.h>
+
+typedef struct shared_key_t shared_key_t;
+typedef enum shared_key_type_t shared_key_type_t;
+
+/**
+ * Type of a shared key.
+ */
+enum shared_key_type_t {
+	/** wildcard for all keys */
+	SHARED_ANY,
+	/** PSK for IKE authentication */
+	SHARED_IKE,
+	/** key for a EAP authentication method */
+	SHARED_EAP,
+	/** key to decrypt encrypted private keys */
+	SHARED_PRIVATE_KEY_PASS,
+	/** PIN to unlock a smartcard */
+	SHARED_PIN,
+};
+
+/**
+ * enum names for shared_key_type_t
+ */
+extern enum_name_t *shared_key_type_names;
+
+/**
+ * A symmetric key shared between multiple owners.
+ *
+ * This class is not thread save, do not add owners while others might be
+ * reading.
+ */
+struct shared_key_t {
+	
+	/**
+	 * Get the kind of this key.
+	 *
+	 * @return			type of the key
+	 */
+	shared_key_type_t (*get_type)(shared_key_t *this);
+	
+	/**
+	 * Get the shared key data.
+	 *
+	 * @return			chunk pointing to the internal key
+	 */
+	chunk_t (*get_key)(shared_key_t *this);
+	
+	/** 
+	 * Increase refcount of the key.
+	 *
+	 * @return			this with an increased refcount 
+	 */
+	shared_key_t* (*get_ref)(shared_key_t *this);
+		
+	/**
+     * Destroy a shared_key instance if all references are gone.
+     */
+    void (*destroy)(shared_key_t *this);
+};
+
+#endif /** SHARED_KEY_H_ @} */