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/*
* Copyright (C) 2008 Martin Willi
* 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 crypto_factory crypto_factory
* @{ @ingroup crypto
*/
#ifndef CRYPTO_FACTORY_H_
#define CRYPTO_FACTORY_H_
typedef struct crypto_factory_t crypto_factory_t;
#include <library.h>
#include <crypto/crypters/crypter.h>
#include <crypto/signers/signer.h>
#include <crypto/hashers/hasher.h>
#include <crypto/prfs/prf.h>
#include <crypto/rngs/rng.h>
#include <crypto/diffie_hellman.h>
/**
* Constructor function for crypters
*/
typedef crypter_t* (*crypter_constructor_t)(encryption_algorithm_t algo,
size_t key_size);
/**
* Constructor function for signers
*/
typedef signer_t* (*signer_constructor_t)(integrity_algorithm_t algo);
/**
* Constructor function for hashers
*/
typedef hasher_t* (*hasher_constructor_t)(hash_algorithm_t algo);
/**
* Constructor function for pseudo random functions
*/
typedef prf_t* (*prf_constructor_t)(pseudo_random_function_t algo);
/**
* Constructor function for source of randomness
*/
typedef rng_t* (*rng_constructor_t)(rng_quality_t quality);
/**
* Constructor function for diffie hellman
*/
typedef diffie_hellman_t* (*dh_constructor_t)(diffie_hellman_group_t group);
/**
* Handles crypto modules and creates instances.
*/
struct crypto_factory_t {
/**
* Create a crypter instance.
*
* @param algo encryption algorithm
* @param key_size length of the key in bytes
* @return crypter_t instance, NULL if not supported
*/
crypter_t* (*create_crypter)(crypto_factory_t *this,
encryption_algorithm_t algo, size_t key_size);
/**
* Create a symmetric signer instance.
*
* @param algo MAC algorithm to use
* @return signer_t instance, NULL if not supported
*/
signer_t* (*create_signer)(crypto_factory_t *this,
integrity_algorithm_t algo);
/**
* Create a hasher instance.
*
* @param algo hash algorithm
* @return hasher_t instance, NULL if not supported
*/
hasher_t* (*create_hasher)(crypto_factory_t *this, hash_algorithm_t algo);
/**
* Create a pseudo random function instance.
*
* @param algo PRF algorithm to use
* @return prf_t instance, NULL if not supported
*/
prf_t* (*create_prf)(crypto_factory_t *this, pseudo_random_function_t algo);
/**
* Create a source of randomness.
*
* @param quality required randomness quality
* @return rng_t instance, NULL if no RNG with such a quality
*/
rng_t* (*create_rng)(crypto_factory_t *this, rng_quality_t quality);
/**
* Create a diffie hellman instance.
*
* @param group diffie hellman group
* @return diffie_hellman_t instance, NULL if not supported
*/
diffie_hellman_t* (*create_dh)(crypto_factory_t *this,
diffie_hellman_group_t group);
/**
* Register a crypter constructor.
*
* @param algo algorithm to constructor
* @param create constructor function for that algorithm
* @return
*/
void (*add_crypter)(crypto_factory_t *this, encryption_algorithm_t algo,
crypter_constructor_t create);
/**
* Unregister a crypter constructor.
*
* @param create constructor function to unregister
*/
void (*remove_crypter)(crypto_factory_t *this, crypter_constructor_t create);
/**
* Register a signer constructor.
*
* @param algo algorithm to constructor
* @param create constructor function for that algorithm
* @return
*/
void (*add_signer)(crypto_factory_t *this, integrity_algorithm_t algo,
signer_constructor_t create);
/**
* Unregister a signer constructor.
*
* @param create constructor function to unregister
*/
void (*remove_signer)(crypto_factory_t *this, signer_constructor_t create);
/**
* Register a hasher constructor.
*
* The first added hasher is the preferred hasher returned on
* create_hasher(HASH_PREFERRED).
*
* @param algo algorithm to constructor
* @param create constructor function for that algorithm
* @return
*/
void (*add_hasher)(crypto_factory_t *this, hash_algorithm_t algo,
hasher_constructor_t create);
/**
* Unregister a hasher constructor.
*
* @param create constructor function to unregister
*/
void (*remove_hasher)(crypto_factory_t *this, hasher_constructor_t create);
/**
* Register a prf constructor.
*
* @param algo algorithm to constructor
* @param create constructor function for that algorithm
* @return
*/
void (*add_prf)(crypto_factory_t *this, pseudo_random_function_t algo,
prf_constructor_t create);
/**
* Unregister a prf constructor.
*
* @param create constructor function to unregister
*/
void (*remove_prf)(crypto_factory_t *this, prf_constructor_t create);
/**
* Register a source of randomness.
*
* @param quality quality of randomness this RNG serves
* @param create constructor function for such a quality
*/
void (*add_rng)(crypto_factory_t *this, rng_quality_t quality, rng_constructor_t create);
/**
* Unregister a source of randomness.
*
* @param create constructor function to unregister
*/
void (*remove_rng)(crypto_factory_t *this, rng_constructor_t create);
/**
* Register a diffie hellman constructor.
*
* @param group dh group to constructor
* @param create constructor function for that algorithm
* @return
*/
void (*add_dh)(crypto_factory_t *this, diffie_hellman_group_t group,
dh_constructor_t create);
/**
* Unregister a diffie hellman constructor.
*
* @param create constructor function to unregister
*/
void (*remove_dh)(crypto_factory_t *this, dh_constructor_t create);
/**
* Create an enumerator over all registered crypter algorithms.
*
* @return enumerator over encryption_algorithm_t
*/
enumerator_t* (*create_crypter_enumerator)(crypto_factory_t *this);
/**
* Create an enumerator over all registered signer algorithms.
*
* @return enumerator over integrity_algorithm_t
*/
enumerator_t* (*create_signer_enumerator)(crypto_factory_t *this);
/**
* Create an enumerator over all registered hasher algorithms.
*
* @return enumerator over hash_algorithm_t
*/
enumerator_t* (*create_hasher_enumerator)(crypto_factory_t *this);
/**
* Create an enumerator over all registered PRFs.
*
* @return enumerator over pseudo_random_function_t
*/
enumerator_t* (*create_prf_enumerator)(crypto_factory_t *this);
/**
* Create an enumerator over all registered diffie hellman groups.
*
* @return enumerator over diffie_hellman_group_t
*/
enumerator_t* (*create_dh_enumerator)(crypto_factory_t *this);
/**
* Destroy a crypto_factory instance.
*/
void (*destroy)(crypto_factory_t *this);
};
/**
* Create a crypto_factory instance.
*/
crypto_factory_t *crypto_factory_create();
#endif /* CRYPTO_FACTORY_H_ @}*/
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