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/**
* @file hmac_signer.h
*
* @brief Interface of hmac_signer_t.
*
*/
/*
* Copyright (C) 2005-2006 Martin Willi
* 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.
*/
#ifndef HMAC_SIGNER_H_
#define HMAC_SIGNER_H_
typedef struct hmac_signer_t hmac_signer_t;
#include <crypto/signers/signer.h>
#include <crypto/hashers/hasher.h>
/**
* @brief Implementation of signer_t interface using HMAC.
*
* HMAC uses a standard hash function implemented in a hasher_t to build
* a MAC.
*
* @ingroup signers
*/
struct hmac_signer_t {
/**
* generic signer_t interface for this signer
*/
signer_t signer_interface;
};
/**
* @brief Creates a new hmac_signer_t.
*
* HMAC signatures are often truncated to shorten them to a more usable, but
* still secure enough length.
* Block size must be equal or smaller then the hash algorithms
* hash.
*
* @param hash_algoritm Hash algorithm to use with signer
* @param block_size Size of resulting signature (truncated to block_size)
* @return
* - hmac_signer_t
* - NULL if hash algorithm not supported
*
* @ingroup signers
*/
hmac_signer_t *hmac_signer_create(hash_algorithm_t hash_algoritm,
size_t block_size);
#endif /*HMAC_SIGNER_H_*/
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