101 lines
2.5 KiB
C
101 lines
2.5 KiB
C
/**
|
|
* @file hmac.h
|
|
*
|
|
* @brief Implementation of message authentication
|
|
* using cryptographic hash functions (HMAC). See RFC2104.
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* 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 HMAC_H_
|
|
#define HMAC_H_
|
|
|
|
|
|
#include "hashers/hasher.h"
|
|
|
|
|
|
/**
|
|
* Object representing a hmac
|
|
*/
|
|
typedef struct hmac_s hmac_t;
|
|
|
|
struct hmac_s {
|
|
/**
|
|
* @brief Generate message authentication code.
|
|
*
|
|
* @param this calling hmac
|
|
* @param data chunk of data to authenticate
|
|
* @param [out]buffer pointer where the generated bytes will be written
|
|
* @return
|
|
* - SUCCESS in any case
|
|
*/
|
|
status_t (*get_mac) (hmac_t *this, chunk_t data, u_int8_t *buffer);
|
|
|
|
/**
|
|
* @brief Generates message authentication code and
|
|
* allocate space for them.
|
|
*
|
|
* @param this calling hmac
|
|
* @param data chunk of data to authenticate
|
|
* @param [out]chunk chunk which will hold generated bytes
|
|
* @return
|
|
* - SUCCESS in any case
|
|
* - OUT_OF_RES if space could not be allocated
|
|
*/
|
|
status_t (*allocate_mac) (hmac_t *this, chunk_t data, chunk_t *chunk);
|
|
|
|
/**
|
|
* @brief get the block size of this hmac
|
|
*
|
|
* @param this calling hmac
|
|
* @return block size in bytes
|
|
*/
|
|
size_t (*get_block_size) (hmac_t *this);
|
|
|
|
/**
|
|
* @brief set the key for this hmac
|
|
*
|
|
* Any key length is accepted.
|
|
*
|
|
* @param this calling hmac
|
|
* @param key key to set
|
|
* @return block size in bytes
|
|
*/
|
|
size_t (*set_key) (hmac_t *this, chunk_t key);
|
|
|
|
/**
|
|
* @brief Destroys a hmac object.
|
|
*
|
|
* @param this hmac_t object to destroy
|
|
* @return
|
|
* SUCCESS in any case
|
|
*/
|
|
status_t (*destroy) (hmac_t *this);
|
|
};
|
|
|
|
/**
|
|
* Creates a new hmac_t object
|
|
*
|
|
* @param hash_algorithm hash algorithm to use
|
|
* @return
|
|
* - hmac_t if successfully
|
|
* - NULL if out of ressources or hash not supported
|
|
*/
|
|
hmac_t *hmac_create(hash_algorithm_t hash_algorithm);
|
|
|
|
#endif /*HMAC_H_*/
|