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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 openssl_hmac openssl_hmac
* @{ @ingroup openssl_p
*/
#ifndef OPENSSL_HMAC_H_
#define OPENSSL_HMAC_H_
typedef struct openssl_hmac_t openssl_hmac_t;
#include <crypto/hashers/hasher.h>
/**
* Simple wrapper around OpenSSL's functions to calculate HMAC message
* authentication codes
*/
struct openssl_hmac_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 apended 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
*/
void (*get_mac)(openssl_hmac_t *this, chunk_t data, u_int8_t *out);
/**
* Generates message authentication code and allocates memory for it.
*
* 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 apended data is calculated, returned in out and the
* internal state is reset;
*
* @param data chunk of data to authenticate
* @param out chunk which will hold generated bytes
*/
void (*allocate_mac)(openssl_hmac_t *this, chunk_t data, chunk_t *out);
/**
* Get the size of the resulting MAC.
*
* @return block size in bytes
*/
size_t (*get_block_size)(openssl_hmac_t *this);
/**
* Set the key to be used for the HMAC.
*
* Any key length is accepted.
*
* @param key key to set
*/
void (*set_key)(openssl_hmac_t *this, chunk_t key);
/**
* Destroys an openssl_hmac_t object.
*/
void (*destroy)(openssl_hmac_t *this);
};
/**
* Creates a new openssl_hmac_t object.
*
* @param algo hash algorithm to use
* @return openssl_hmac_t object, NULL if not supported
*/
openssl_hmac_t *openssl_hmac_create(hash_algorithm_t algo);
#endif /** OPENSSL_HMAC_H_ @}*/
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