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/*
* Copyright (C) 2013 Andreas Steffen
* HSR 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 ntru_drbg ntru_drbg
* @{ @ingroup ntru_p
*/
#ifndef NTRU_DRBG_H_
#define NTRU_DRBG_H_
typedef struct ntru_drbg_t ntru_drbg_t;
#include <library.h>
/**
* Implements a HMAC Deterministic Random Bit Generator (HMAC_DRBG)
* compliant with NIST SP 800-90A
*/
struct ntru_drbg_t {
/**
* Reseed the instantiated DRBG
*
* @return configured security strength in bits
*/
uint32_t (*get_strength)(ntru_drbg_t *this);
/**
* Reseed the instantiated DRBG
*
* @return TRUE if successful
*/
bool (*reseed)(ntru_drbg_t *this);
/**
* Generate pseudorandom bytes.
* If the maximum number of requests has been reached, reseeding occurs
*
* @param strength requested security strength in bits
* @param len number of octets to generate
* @param out address of output buffer
* @return TRUE if successful
*/
bool (*generate)(ntru_drbg_t *this, uint32_t strength, uint32_t len,
uint8_t *out);
/**
* Get a reference on an ntru_drbg_t object increasing the count by one
*
* @return reference to the ntru_drbg_t object
*/
ntru_drbg_t* (*get_ref)(ntru_drbg_t *this);
/**
* Uninstantiate and destroy the DRBG object
*/
void (*destroy)(ntru_drbg_t *this);
};
/**
* Create and instantiate a new DRBG objet.
*
* @param strength security strength in bits
* @param pers_str personalization string
* @param entropy entropy source to use
*/
ntru_drbg_t *ntru_drbg_create(uint32_t strength, chunk_t pers_str,
rng_t *entropy);
#endif /** NTRU_DRBG_H_ @}*/
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