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diff --git a/src/libstrongswan/credentials/credential_factory.h b/src/libstrongswan/credentials/credential_factory.h
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+/*
+ * Copyright (C) 2008 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 credential_factory credential_factory
+ * @{ @ingroup credentials
+ */
+
+#ifndef CREDENTIAL_FACTORY_H_
+#define CREDENTIAL_FACTORY_H_
+
+typedef struct credential_factory_t credential_factory_t;
+typedef enum credential_type_t credential_type_t;
+
+#include <credentials/keys/private_key.h>
+#include <credentials/keys/public_key.h>
+#include <credentials/certificates/certificate.h>
+#include <credentials/builder.h>
+
+/**
+ * Kind of credential.
+ */
+enum credential_type_t {
+	/** private key, implemented in private_key_t */
+	CRED_PRIVATE_KEY,
+	/** public key, implemented in public_key_t */
+	CRED_PUBLIC_KEY,
+	/** certificates, implemented in certificate_t */
+	CRED_CERTIFICATE,
+};
+
+/**
+ * enum names for credential_type_t
+ */
+extern enum_name_t *credential_type_names;
+
+/**
+ * Manages credential construction functions and creates instances.
+ */
+struct credential_factory_t {
+						 
+	/**
+	 * Create a credential using a list of builder_part_t's.
+	 *
+	 * The variable argument list takes builder_part_t types followed
+	 * by the type specific value. The list must be terminated using BUILD_END.
+	 *
+	 * @param type			credential type to build
+	 * @param subtype		subtype specific for type of the credential
+	 * @param ...			build_part_t arguments, BUILD_END terminated.
+	 * @return				type specific credential, NULL if failed
+	 */
+	void* (*create)(credential_factory_t *this, credential_type_t type,
+					int subtype, ...);
+	
+	/**
+	 * Create a builder instance to build credentials.
+	 *
+	 * @param type			type of credentials the builder creates
+	 * @param subtype		type specific subtype, such as certificate_type_t
+	 * @return				builder instance
+	 */
+	builder_t* (*create_builder)(credential_factory_t *this,
+								 credential_type_t type, int subtype);
+	/**
+	 * Register a builder_t constructor function.
+	 *
+	 * @param type			type of credential the builder creates
+	 * @param constructor	builder constructor function to register
+	 */
+	void (*add_builder)(credential_factory_t *this,
+						credential_type_t type, int subtype, 
+						builder_constructor_t constructor);
+	/**
+	 * Unregister a builder_t constructor function.
+	 *
+	 * @param constructor	constructor function to unregister.
+	 */
+	void (*remove_builder)(credential_factory_t *this, 
+						   builder_constructor_t constructor);
+	
+	/**
+     * Destroy a credential_factory instance.
+     */
+    void (*destroy)(credential_factory_t *this);
+};
+
+/**
+ * Create a credential_factory instance.
+ */
+credential_factory_t *credential_factory_create();
+
+#endif /* CREDENTIAL_FACTORY_H_ @}*/