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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_mgf1 ntru_mgf1
* @{ @ingroup ntru_p
*/
#ifndef NTRU_MGF1_H_
#define NTRU_MGF1_H_
typedef struct ntru_mgf1_t ntru_mgf1_t;
#include <library.h>
/**
* Implements the PKCS#1 MGF1 Mask Generation Function based on a hash function
* defined in section 10.2.1 of RFC 2437
*/
struct ntru_mgf1_t {
/**
* Get the hash size of the underlying hash function
*
* @return hash size in bytes
*/
size_t (*get_hash_size)(ntru_mgf1_t *this);
/**
* Generate a mask pattern and copy it to an output buffer
* If the maximum number of requests has been reached, reseeding occurs
*
* @param mask_len number of mask bytes to generate
* @param mask output buffer of minimum size mask_len
* @return TRUE if successful
*/
bool (*get_mask)(ntru_mgf1_t *this, size_t mask_len, u_char *mask);
/**
* Generate a mask pattern and return it in an allocated chunk
*
* @param mask_len number of mask bytes to generate
* @param mask chunk containing generated mask
* @return TRUE if successful
*/
bool (*allocate_mask)(ntru_mgf1_t *this, size_t mask_len, chunk_t *mask);
/**
* Destroy the MGF1 object
*/
void (*destroy)(ntru_mgf1_t *this);
};
/**
* Create an MGF1 object
*
* @param alg hash algorithm to be used by MGF1
* @param seed seed used by MGF1 to generate mask from
* @param hash_seed hash seed before using it as a seed from MGF1
*/
ntru_mgf1_t *ntru_mgf1_create(hash_algorithm_t alg, chunk_t seed,
bool hash_seed);
#endif /** NTRU_MGF1_H_ @}*/
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