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/*
* Copyright (C) 2011 Sansar Choinyambuu
* 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 pts_meas_algo pts_meas_algo
* @{ @ingroup pts
*/
#ifndef PTS_MEAS_ALGO_H_
#define PTS_MEAS_ALGO_H_
#include <library.h>
#include <crypto/hashers/hasher.h>
typedef enum pts_meas_algorithms_t pts_meas_algorithms_t;
/**
* PTS Measurement Algorithms
*/
enum pts_meas_algorithms_t {
PTS_MEAS_ALGO_NONE = 0,
PTS_MEAS_ALGO_SHA1 = (1<<15),
PTS_MEAS_ALGO_SHA256 = (1<<14),
PTS_MEAS_ALGO_SHA384 = (1<<13),
};
/**
* enum name for pts_meas_algorithms_t.
*/
extern enum_name_t *pts_meas_algorithm_names;
/**
* Diffie-Hellman Hash Algorithm Values
* see section 3.8.5 of PTS Protocol: Binding to TNC IF-M Specification
*
* 1
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |1|2|3|R|R|R|R|R|R|R|R|R|R|R|R|R|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
*/
/**
* Probe available PTS measurement algorithms
*
* @param algorithms set of available algorithms
* @return TRUE if mandatory algorithms are available
*/
bool pts_meas_algo_probe(pts_meas_algorithms_t *algorithms);
/**
* Update supported PTS measurement algorithms according to configuration
*
* sha1 : PTS_MEAS_ALGO_SHA1
* sha256: PTS_MEAS_ALGO_SHA1 | PTS_MEAS_ALGO_SHA256
* sha384: PTS_MEAS_ALGO_SHA1 | PTS_MEAS_ALGO_SHA256 | PTS_MEAS_ALGO_SHA384
*
* The PTS-IMC is expected to select the strongest supported algorithm
*
* @param hash_alg configured hash algorithm
* @param algorithms returns set of available PTS measurement algorithms
*/
bool pts_meas_algo_update(char *hash_alg, pts_meas_algorithms_t *algorithms);
/**
* Select the strongest PTS measurement algorithm
* among a set of offered PTS measurement algorithms
*
* @param supported_algos set of supported PTS measurement algorithms
* @param offered_algos set of offered PTS measurements algorithms
* @return selected algorithm
*/
pts_meas_algorithms_t pts_meas_algo_select(pts_meas_algorithms_t supported_algos,
pts_meas_algorithms_t offered_algos);
/**
* Convert pts_meas_algorithms_t to hash_algorithm_t
*
* @param algorithm PTS measurement algorithm type
* @return libstrongswan hash algorithm type
*/
hash_algorithm_t pts_meas_algo_to_hash(pts_meas_algorithms_t algorithm);
/**
* Return the hash size of a pts_meas_algorithm
*
* @param algorithm PTS measurement algorithm type
* @return hash size in bytes
*/
size_t pts_meas_algo_hash_size(pts_meas_algorithms_t algorithm);
#endif /** PTS_MEAS_ALGO_H_ @}*/
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