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/**
* @file prf.h
*
* @brief Interface prf_t.
*
*/
/*
* Copyright (C) 2005 Jan Hutter, 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.
*/
#ifndef PRF_H_
#define PRF_H_
#include <types.h>
typedef enum pseudo_random_function_t pseudo_random_function_t;
/**
* @brief Pseudo random function, as in IKEv2 draft 3.3.2.
*
* Currently only the following algorithms are implemented and therefore supported:
* - PRF_HMAC_MD5
* - PRF_HMAC_SHA1
*
* @ingroup prfs
*/
enum pseudo_random_function_t {
PRF_UNDEFINED = 1024,
/**
* Implemented in class hmac_prf_t.
*/
PRF_HMAC_MD5 = 1,
/**
* Implemented in class hmac_prf_t.
*/
PRF_HMAC_SHA1 = 2,
PRF_HMAC_TIGER = 3,
PRF_AES128_CBC = 4
};
/**
* String mappings for encryption_algorithm_t.
*/
extern mapping_t pseudo_random_function_m[];
typedef struct prf_t prf_t;
/**
* @brief Generic interface for pseudo-random-functions.
*
* @b Constructors:
* - prf_create()
* - hmac_prf_create()
*
* @todo Implement more prf algorithms
*
* @ingroup prfs
*/
struct prf_t {
/**
* @brief Generates pseudo random bytes and writes them
* in the buffer.
*
* @param this calling object
* @param seed a chunk containing the seed for the next bytes
* @param[out] buffer pointer where the generated bytes will be written
*/
void (*get_bytes) (prf_t *this, chunk_t seed, u_int8_t *buffer);
/**
* @brief Generates pseudo random bytes and allocate space for them.
*
* @param this calling object
* @param seed a chunk containing the seed for the next bytes
* @param[out] chunk chunk which will hold generated bytes
*/
void (*allocate_bytes) (prf_t *this, chunk_t seed, chunk_t *chunk);
/**
* @brief Get the block size of this prf_t object.
*
* @param this calling object
* @return block size in bytes
*/
size_t (*get_block_size) (prf_t *this);
/**
* @brief Set the key for this prf_t object.
*
* @param this calling object
* @param key key to set
*/
void (*set_key) (prf_t *this, chunk_t key);
/**
* @brief Destroys a prf object.
*
* @param this calling object
*/
void (*destroy) (prf_t *this);
};
/**
* @brief Generic constructor for a prf_t oject.
*
* @param pseudo_random_function Algorithm to use
* @return
* - prf_t object
* - NULL if prf algorithm not supported
*
* @ingroup prfs
*/
prf_t *prf_create(pseudo_random_function_t pseudo_random_function);
#endif /*PRF_H_*/
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