79 lines
2.0 KiB
C
79 lines
2.0 KiB
C
/*
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* Copyright (C) 2012 Tobias Brunner
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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/**
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* @defgroup cmac cmac
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* @{ @ingroup cmac_p
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*/
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#ifndef CMAC_H_
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#define CMAC_H_
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#include <crypto/crypters/crypter.h>
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typedef struct cmac_t cmac_t;
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/**
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* Cipher-based Message Authentication Code (CMAC).
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*
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* This class implements the message authentication algorithm
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* described in RFC 4493.
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*/
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struct cmac_t {
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/**
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* Generate message authentication code.
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*
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* If buffer is NULL, no result is given back. A next call will
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* append the data to already supplied data. If buffer is not NULL,
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* the mac of all apended data is calculated, returned and the internal
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* state is reset.
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*
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* @param data chunk of data to authenticate
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* @param buffer pointer where the generated bytes will be written
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*/
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void (*get_mac) (cmac_t *this, chunk_t data, u_int8_t *buffer);
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/**
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* Get the block size of this cmac_t object.
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*
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* @return block size in bytes
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*/
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size_t (*get_block_size) (cmac_t *this);
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/**
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* Set the key for this cmac_t object.
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*
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* @param key key to set
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*/
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void (*set_key) (cmac_t *this, chunk_t key);
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/**
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* Destroys a cmac_t object.
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*/
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void (*destroy) (cmac_t *this);
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};
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/**
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* Creates a new cmac_t object.
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*
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* @param algo underlying crypto algorithm
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* @param key_size key size to use, if required for algorithm
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* @return cmac_t object, NULL if not supported
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*/
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cmac_t *cmac_create(encryption_algorithm_t algo, size_t key_size);
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#endif /** CMAC_H_ @}*/
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