119 lines
2.9 KiB
C
119 lines
2.9 KiB
C
/**
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* @file hasher.h
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*
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* @brief Interface for hasher_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 HASHER_H_
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#define HASHER_H_
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#include <types.h>
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typedef enum hash_algorithm_t hash_algorithm_t;
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/**
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* @brief Algorithms to use for hashing.
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*/
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enum hash_algorithm_t {
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HASH_SHA1,
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HASH_MD5
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};
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/**
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* string mappings for hash_algorithm_t
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*/
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extern mapping_t hash_algorithm_m[];
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typedef struct hasher_t hasher_t;
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/**
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* @brief Generic interface for all hash functions.
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*
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* @ingroup hashers
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*/
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struct hasher_t {
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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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* If the parameter hash is NULL, no result is written back
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* an more data can be appended to already hashed data.
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* If not, the result is written back and the hasher is reset.
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*
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* @warning: the hash output parameter must hold at least
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* hash_t.get_block_size bytes.
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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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*/
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void (*get_hash) (hasher_t *this, chunk_t data, u_int8_t *hash);
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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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* If the parameter hash is NULL, no result is written back
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* an more data can be appended to already hashed data.
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* If not, the result is written back and the hasher is reset.
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*
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* @param this calling hasher
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* @param data chunk with data to hash
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* @param [out]hash chunk which will hold allocated hash
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*/
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void (*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 Resets the hashers state, which allows
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* computation of a completly new hash.
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*
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* @param this calling hasher
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*/
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void (*reset) (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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*/
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void (*destroy) (hasher_t *this);
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};
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/**
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* @brief Generic interface to create a hasher_t.
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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 algorithm not supported
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*
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* @ingroup hashers
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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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