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diff --git a/src/libcharon/encoding/payloads/transform_attribute.h b/src/libcharon/encoding/payloads/transform_attribute.h
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+++ b/src/libcharon/encoding/payloads/transform_attribute.h
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+/*
+ * Copyright (C) 2005-2006 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * 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 transform_attribute transform_attribute
+ * @{ @ingroup payloads
+ */
+
+#ifndef TRANSFORM_ATTRIBUTE_H_
+#define TRANSFORM_ATTRIBUTE_H_
+
+typedef enum transform_attribute_type_t transform_attribute_type_t;
+typedef struct transform_attribute_t transform_attribute_t;
+
+#include <library.h>
+#include <encoding/payloads/payload.h>
+
+
+/**
+ * Type of the attribute, as in IKEv2 RFC 3.3.5.
+ */
+enum transform_attribute_type_t {
+	ATTRIBUTE_UNDEFINED = 16384,
+	KEY_LENGTH = 14
+};
+
+/**
+ * enum name for transform_attribute_type_t.
+ */
+extern enum_name_t *transform_attribute_type_names;
+
+/**
+ * Class representing an IKEv2- TRANSFORM Attribute.
+ *
+ * The TRANSFORM ATTRIBUTE format is described in RFC section 3.3.5.
+ */
+struct transform_attribute_t {
+	/**
+	 * The payload_t interface.
+	 */
+	payload_t payload_interface;
+
+	/**
+	 * Returns the currently set value of the attribute.
+	 *
+	 * Returned data are not copied.
+	 *
+	 * @return 		chunk_t pointing to the value
+	 */
+	chunk_t (*get_value_chunk) (transform_attribute_t *this);
+
+	/**
+	 * Returns the currently set value of the attribute.
+	 *
+	 * Returned data are not copied.
+	 *
+	 * @return 		value
+	 */
+	u_int16_t (*get_value) (transform_attribute_t *this);
+
+	/**
+	 * Sets the value of the attribute.
+	 *
+	 * Value is getting copied.
+	 *
+	 * @param value chunk_t pointing to the value to set
+	 */
+	void (*set_value_chunk) (transform_attribute_t *this, chunk_t value);
+
+	/**
+	 * Sets the value of the attribute.
+	 *
+	 * @param value value to set
+	 */
+	void (*set_value) (transform_attribute_t *this, u_int16_t value);
+
+	/**
+	 * Sets the type of the attribute.
+	 *
+	 * @param type	type to set (most significant bit is set to zero)
+	 */
+	void (*set_attribute_type) (transform_attribute_t *this, u_int16_t type);
+
+	/**
+	 * get the type of the attribute.
+	 *
+	 * @return 		type of the value
+	 */
+	u_int16_t (*get_attribute_type) (transform_attribute_t *this);
+
+	/**
+	 * Clones an transform_attribute_t object.
+	 *
+	 * @return		cloned transform_attribute_t object
+	 */
+	transform_attribute_t * (*clone) (transform_attribute_t *this);
+
+	/**
+	 * Destroys an transform_attribute_t object.
+	 */
+	void (*destroy) (transform_attribute_t *this);
+};
+
+/**
+ * Creates an empty transform_attribute_t object.
+ *
+ * @return				transform_attribute_t object
+ */
+transform_attribute_t *transform_attribute_create(void);
+
+/**
+ * Creates an transform_attribute_t of type KEY_LENGTH.
+ *
+ * @param key_length	key length in bytes
+ * @return				transform_attribute_t object
+ */
+transform_attribute_t *transform_attribute_create_key_length(u_int16_t key_length);
+
+#endif /** TRANSFORM_ATTRIBUTE_H_ @}*/