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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.
*
* $Id: transform_substructure.h 5003 2009-03-24 17:43:01Z martin $
*/
/**
* @defgroup transform_substructure transform_substructure
* @{ @ingroup payloads
*/
#ifndef TRANSFORM_SUBSTRUCTURE_H_
#define TRANSFORM_SUBSTRUCTURE_H_
typedef struct transform_substructure_t transform_substructure_t;
#include <library.h>
#include <encoding/payloads/payload.h>
#include <encoding/payloads/transform_attribute.h>
#include <utils/linked_list.h>
#include <crypto/diffie_hellman.h>
#include <crypto/signers/signer.h>
#include <crypto/prfs/prf.h>
#include <crypto/crypters/crypter.h>
#include <config/proposal.h>
/**
* IKEv1 Value for a transform payload.
*/
#define TRANSFORM_TYPE_VALUE 3
/**
* Length of the transform substructure header in bytes.
*/
#define TRANSFORM_SUBSTRUCTURE_HEADER_LENGTH 8
/**
* Class representing an IKEv2- TRANSFORM SUBSTRUCTURE.
*
* The TRANSFORM SUBSTRUCTURE format is described in RFC section 3.3.2.
*/
struct transform_substructure_t {
/**
* The payload_t interface.
*/
payload_t payload_interface;
/**
* Creates an iterator of stored transform_attribute_t objects.
*
* When deleting an transform attribute using this iterator,
* the length of this transform substructure has to be refreshed
* by calling get_length().
*
* @param forward iterator direction (TRUE: front to end)
* @return created iterator_t object.
*/
iterator_t * (*create_transform_attribute_iterator) (
transform_substructure_t *this, bool forward);
/**
* Adds a transform_attribute_t object to this object.
*
* @param proposal transform_attribute_t object to add
*/
void (*add_transform_attribute) (transform_substructure_t *this,
transform_attribute_t *attribute);
/**
* Sets the next_payload field of this substructure
*
* If this is the last transform, next payload field is set to 0,
* otherwise to 3
*
* @param is_last When TRUE, next payload field is set to 0, otherwise to 3
*/
void (*set_is_last_transform) (transform_substructure_t *this, bool is_last);
/**
* Checks if this is the last transform.
*
* @return TRUE if this is the last Transform, FALSE otherwise
*/
bool (*get_is_last_transform) (transform_substructure_t *this);
/**
* Sets transform type of the current transform substructure.
*
* @param type type value to set
*/
void (*set_transform_type) (transform_substructure_t *this, u_int8_t type);
/**
* get transform type of the current transform.
*
* @return Transform type of current transform substructure.
*/
u_int8_t (*get_transform_type) (transform_substructure_t *this);
/**
* Sets transform id of the current transform substructure.
*
* @param id transform id to set
*/
void (*set_transform_id) (transform_substructure_t *this, u_int16_t id);
/**
* get transform id of the current transform.
*
* @return Transform id of current transform substructure.
*/
u_int16_t (*get_transform_id) (transform_substructure_t *this);
/**
* get transform id of the current transform.
*
* @param key_length The key length is written to this location
* @return
* - SUCCESS if a key length attribute is contained
* - FAILED if no key length attribute is part of this
* transform or key length uses more then 16 bit!
*/
status_t (*get_key_length) (transform_substructure_t *this,
u_int16_t *key_length);
/**
* Clones an transform_substructure_t object.
*
* @return cloned transform_substructure_t object
*/
transform_substructure_t* (*clone) (transform_substructure_t *this);
/**
* Destroys an transform_substructure_t object.
*/
void (*destroy) (transform_substructure_t *this);
};
/**
* Creates an empty transform_substructure_t object.
*
* @return created transform_substructure_t object
*/
transform_substructure_t *transform_substructure_create(void);
/**
* Creates an empty transform_substructure_t object.
*
* The key length is used for the transport types ENCRYPTION_ALGORITHM,
* PSEUDO_RANDOM_FUNCTION, INTEGRITY_ALGORITHM. For all
* other transport types the key_length parameter is not used
*
* @param transform_type type of transform to create
* @param transform_id transform id specifying the specific algorithm of a transform type
* @param key_length Key length for key lenght attribute
* @return transform_substructure_t object
*/
transform_substructure_t *transform_substructure_create_type(
transform_type_t transform_type, u_int16_t transform_id,
u_int16_t key_length);
#endif /** TRANSFORM_SUBSTRUCTURE_H_ @}*/
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