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/*
* Copyright (C) 2013 Tobias Brunner
* 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.
*/
/**
* @defgroup iv iv
* @{ @ingroup crypto
*/
#ifndef IV_GEN_H_
#define IV_GEN_H_
typedef struct iv_gen_t iv_gen_t;
#include <library.h>
/**
* Generic interface for initialization vector (IV) generators.
*/
struct iv_gen_t {
/**
* Generates an IV and writes it into the buffer.
*
* @param seq external sequence number
* @param size size of IV in bytes
* @param buffer pointer where the generated IV will be written
* @return TRUE if IV allocation was successful, FALSE otherwise
*/
bool (*get_iv)(iv_gen_t *this, uint64_t seq, size_t size,
uint8_t *buffer) __attribute__((warn_unused_result));
/**
* Generates an IV and allocates space for it.
*
* @param seq external sequence number
* @param size size of IV in bytes
* @param chunk chunk which will hold the generated IV
* @return TRUE if IV allocation was successful, FALSE otherwise
*/
bool (*allocate_iv)(iv_gen_t *this, uint64_t seq, size_t size,
chunk_t *chunk) __attribute__((warn_unused_result));
/**
* Destroys an IV generator object.
*/
void (*destroy)(iv_gen_t *this);
};
/**
* Select an IV generator for a given encryption algorithm.
*
* @param alg encryption algorithm
* @return IV generator
*/
iv_gen_t* iv_gen_create_for_alg(encryption_algorithm_t alg);
#endif /** IV_GEN_H_ @}*/
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