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/*
* Copyright (C) 2012 Tobias Brunner
* 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 cmac cmac
* @{ @ingroup cmac_p
*/
#ifndef CMAC_H_
#define CMAC_H_
#include <crypto/crypters/crypter.h>
typedef struct cmac_t cmac_t;
/**
* Cipher-based Message Authentication Code (CMAC).
*
* This class implements the message authentication algorithm
* described in RFC 4493.
*/
struct cmac_t {
/**
* Generate message authentication code.
*
* If buffer is NULL, no result is given back. A next call will
* append the data to already supplied data. If buffer is not NULL,
* the mac of all apended data is calculated, returned and the internal
* state is reset.
*
* @param data chunk of data to authenticate
* @param buffer pointer where the generated bytes will be written
*/
void (*get_mac) (cmac_t *this, chunk_t data, u_int8_t *buffer);
/**
* Get the block size of this cmac_t object.
*
* @return block size in bytes
*/
size_t (*get_block_size) (cmac_t *this);
/**
* Set the key for this cmac_t object.
*
* @param key key to set
*/
void (*set_key) (cmac_t *this, chunk_t key);
/**
* Destroys a cmac_t object.
*/
void (*destroy) (cmac_t *this);
};
/**
* Creates a new cmac_t object.
*
* @param algo underlying crypto algorithm
* @param key_size key size to use, if required for algorithm
* @return cmac_t object, NULL if not supported
*/
cmac_t *cmac_create(encryption_algorithm_t algo, size_t key_size);
#endif /** CMAC_H_ @}*/
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