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diff --git a/src/libstrongswan/credentials/containers/container.h b/src/libstrongswan/credentials/containers/container.h
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+++ b/src/libstrongswan/credentials/containers/container.h
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+/*
+ * Copyright (C) 2012 Martin Willi
+ * Copyright (C) 2012 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 container container
+ * @{ @ingroup containers
+ */
+
+#ifndef CONTAINER_H_
+#define CONTAINER_H_
+
+typedef struct container_t container_t;
+typedef enum container_type_t container_type_t;
+
+#include <utils/chunk.h>
+#include <collections/enumerator.h>
+
+/**
+ * Type of the container.
+ */
+enum container_type_t {
+	/** Any kind of PKCS7/CMS container */
+	CONTAINER_PKCS7,
+	/** PKCS7/CMS plain "data" */
+	CONTAINER_PKCS7_DATA,
+	/** PKCS7/CMS "signed-data" */
+	CONTAINER_PKCS7_SIGNED_DATA,
+	/** PKCS7/CMS "enveloped-data" */
+	CONTAINER_PKCS7_ENVELOPED_DATA,
+};
+
+/**
+ * Enum names for container_type_t
+ */
+extern enum_name_t *container_type_names;
+
+/**
+ * Generic interface for cryptographic containers.
+ */
+struct container_t {
+
+	/**
+	 * Get the type of the container.
+	 *
+	 * @return		container type
+	 */
+	container_type_t (*get_type)(container_t *this);
+
+	/**
+	 * Create an enumerator over trustchains for valid container signatures.
+	 *
+	 * @return		enumerator over auth_cfg_t*
+	 */
+	enumerator_t* (*create_signature_enumerator)(container_t *this);
+
+	/**
+	 * Get signed/decrypted data wrapped in this container.
+	 *
+	 * This function does not verify any associated signatures, use
+	 * create_signature_enumerator() to verify them.
+	 *
+	 * @param data	allocated data wrapped in this container
+	 * @return		TRUE if data decrypted successfully
+	 */
+	bool (*get_data)(container_t *this, chunk_t *data);
+
+	/**
+	 * Get the encoding of the full signed/encrypted container.
+	 *
+	 * @param data	allocated container encoding
+	 * @return		TRUE if encodign successful
+	 */
+	bool (*get_encoding)(container_t *this, chunk_t *encoding);
+
+	/**
+	 * Destroy a container_t.
+	 */
+	void (*destroy)(container_t *this);
+};
+
+#endif /** CONTAINER_H_ @}*/