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/*
* Copyright (C) 2012 Tobias Brunner
* Copyright (C) 2005-2008 Martin Willi
* Copyright (C) 2005 Jan Hutter
* HSR 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 mac mac
* @{ @ingroup crypto
*/
#ifndef MAC_H_
#define MAC_H_
typedef struct mac_t mac_t;
#include <library.h>
/**
* Generic interface for message authentication codes.
*
* Classes implementing this interface can use the PRF and signer wrappers.
*/
struct mac_t {
/**
* Generate message authentication code.
*
* If out is NULL, no result is given back. A next call will
* append the data to already supplied data. If out is not NULL,
* the MAC of all appended data is calculated, written to out and the
* internal state is reset.
*
* @param data chunk of data to authenticate
* @param out pointer where the generated bytes will be written
* @return TRUE if MAC generated successfully
*/
bool (*get_mac)(mac_t *this, chunk_t data,
uint8_t *out) __attribute__((warn_unused_result));
/**
* Get the size of the resulting MAC.
*
* @return block size in bytes
*/
size_t (*get_mac_size)(mac_t *this);
/**
* Set the key to be used for the MAC.
*
* Any key length must be accepted.
*
* @param key key to set
* @return TRUE if key set successfully
*/
bool (*set_key)(mac_t *this,
chunk_t key) __attribute__((warn_unused_result));
/**
* Destroys a mac_t object.
*/
void (*destroy) (mac_t *this);
};
#endif /** MAC_H_ @}*/
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