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/*
* Copyright (C) 2005-2010 Martin Willi
* Copyright (C) 2010 revosec AG
* 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 encryption_payload encryption_payload
* @{ @ingroup payloads
*/
#ifndef ENCRYPTION_PAYLOAD_H_
#define ENCRYPTION_PAYLOAD_H_
typedef struct encryption_payload_t encryption_payload_t;
#include <library.h>
#include <crypto/aead.h>
#include <encoding/payloads/payload.h>
/**
* Encrpytion payload length in bytes without IV and following data.
*/
#define ENCRYPTION_PAYLOAD_HEADER_LENGTH 4
/**
* The encryption payload as described in RFC section 3.14.
*/
struct encryption_payload_t {
/**
* Implements payload_t interface.
*/
payload_t payload_interface;
/**
* Get the payload length.
*
* @return (expected) payload length
*/
size_t (*get_length)(encryption_payload_t *this);
/**
* Adds a payload to this encryption payload.
*
* @param payload payload_t object to add
*/
void (*add_payload) (encryption_payload_t *this, payload_t *payload);
/**
* Remove the first payload in the list
*
* @param payload removed payload
* @return payload, NULL if none left
*/
payload_t* (*remove_payload)(encryption_payload_t *this);
/**
* Set the AEAD transform to use.
*
* @param aead aead transform to use
*/
void (*set_transform) (encryption_payload_t *this, aead_t *aead);
/**
* Generate, encrypt and sign contained payloads.
*
* @param assoc associated data
* @return TRUE if encrypted
*/
bool (*encrypt) (encryption_payload_t *this, chunk_t assoc);
/**
* Decrypt, verify and parse contained payloads.
*
* @param assoc associated data
* - SUCCESS if parsing successful
* - PARSE_ERROR if sub-payload parsing failed
* - VERIFY_ERROR if sub-payload verification failed
* - FAILED if integrity check failed
* - INVALID_STATE if aead not supplied, but needed
*/
status_t (*decrypt) (encryption_payload_t *this, chunk_t assoc);
/**
* Destroys an encryption_payload_t object.
*/
void (*destroy) (encryption_payload_t *this);
};
/**
* Creates an empty encryption_payload_t object.
*
* @return encryption_payload_t object
*/
encryption_payload_t *encryption_payload_create(void);
#endif /** ENCRYPTION_PAYLOAD_H_ @}*/
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