98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
/**
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* @file hasher.h
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*
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* @brief Generic interface for hash functions
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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 HASHER_H_
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#define HASHER_H_
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#include "../../types.h"
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/**
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* algorithms to use for hashing
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*/
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typedef enum hash_algorithm_e hash_algorithm_t;
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enum hash_algorithm_e {
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SHA1,
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MD5
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};
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/**
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* Object representing a hasher
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*/
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typedef struct hasher_s hasher_t;
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struct hasher_s {
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/**
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* @brief hash data and write it in the buffer
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*
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* @param this calling hasher
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* @param data data to hash
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* @param [out]buffer pointer where the hash will be written
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* @return
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* - SUCCESS in any case
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*/
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status_t (*get_hash) (hasher_t *this, chunk_t data, u_int8_t *buffer);
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/**
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* @brief hash data and allocate space for the hash
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*
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* @param this calling hasher
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* @param seed a chunk containing the seed for the next bytes
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* @param [out]hash chunk which will hold allocated hash
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* @return
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* - SUCCESS in any case
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* - OUT_OF_RES if space could not be allocated
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*/
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status_t (*allocate_hash) (hasher_t *this, chunk_t data, chunk_t *hash);
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/**
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* @brief get the block size of this hashing function
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*
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* @param this calling hasher
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* @return block size in bytes
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*/
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size_t (*get_block_size) (hasher_t *this);
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/**
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* @brief Destroys a hasher object.
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*
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* @param this hasher_t object to destroy
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* @return
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* SUCCESS in any case
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*/
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status_t (*destroy) (hasher_t *this);
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};
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/**
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* Creates a new hasher_t object
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*
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* @param hash_algorithm Algorithm to use for hashing
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* @return
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* - hasher_t if successfully
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* - NULL if out of ressources
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*/
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hasher_t *hasher_create(hash_algorithm_t hash_algorithm);
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#endif /*HASHER_H_*/
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