129 lines
2.9 KiB
C
129 lines
2.9 KiB
C
/**
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* @file prf.h
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*
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* @brief Interface prf_t.
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*
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*/
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/*
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* Copyright (C) 2005 Jan Hutter, Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#ifndef PRF_H_
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#define PRF_H_
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#include <types.h>
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typedef enum pseudo_random_function_t pseudo_random_function_t;
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/**
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* @brief Pseudo random function, as in IKEv2 draft 3.3.2.
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*
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* Currently only the following algorithms are implemented and therefore supported:
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* - PRF_HMAC_MD5
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* - PRF_HMAC_SHA1
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*
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* @ingroup prfs
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*/
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enum pseudo_random_function_t {
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PRF_UNDEFINED = 1024,
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/**
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* Implemented in class hmac_prf_t.
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*/
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PRF_HMAC_MD5 = 1,
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/**
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* Implemented in class hmac_prf_t.
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*/
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PRF_HMAC_SHA1 = 2,
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PRF_HMAC_TIGER = 3,
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PRF_AES128_CBC = 4
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};
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/**
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* String mappings for encryption_algorithm_t.
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*/
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extern mapping_t pseudo_random_function_m[];
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typedef struct prf_t prf_t;
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/**
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* @brief Generic interface for pseudo-random-functions.
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*
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* @b Constructors:
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* - prf_create()
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* - hmac_prf_create()
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*
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* @todo Implement more prf algorithms
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*
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* @ingroup prfs
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*/
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struct prf_t {
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/**
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* @brief Generates pseudo random bytes and writes them
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* in the buffer.
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*
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* @param this calling object
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* @param seed a chunk containing the seed for the next bytes
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* @param[out] buffer pointer where the generated bytes will be written
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*/
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void (*get_bytes) (prf_t *this, chunk_t seed, u_int8_t *buffer);
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/**
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* @brief Generates pseudo random bytes and allocate space for them.
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*
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* @param this calling object
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* @param seed a chunk containing the seed for the next bytes
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* @param[out] chunk chunk which will hold generated bytes
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*/
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void (*allocate_bytes) (prf_t *this, chunk_t seed, chunk_t *chunk);
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/**
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* @brief Get the block size of this prf_t object.
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*
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* @param this calling object
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* @return block size in bytes
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*/
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size_t (*get_block_size) (prf_t *this);
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/**
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* @brief Set the key for this prf_t object.
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*
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* @param this calling object
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* @param key key to set
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*/
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void (*set_key) (prf_t *this, chunk_t key);
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/**
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* @brief Destroys a prf object.
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*
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* @param this calling object
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*/
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void (*destroy) (prf_t *this);
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};
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/**
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* @brief Generic constructor for a prf_t oject.
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*
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* @param pseudo_random_function Algorithm to use
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* @return
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* - prf_t object
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* - NULL if prf algorithm not supported
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*
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* @ingroup prfs
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*/
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prf_t *prf_create(pseudo_random_function_t pseudo_random_function);
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#endif /*PRF_H_*/
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