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/*
* Copyright (C) 2014 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 bliss_utils bliss_utils
* @{ @ingroup bliss_p
*/
#ifndef BLISS_UTILS_H_
#define BLISS_UTILS_H_
#include "bliss_param_set.h"
#include <library.h>
/**
* Compute the scalar product of two vectors of size n
*
* @param x input vector of size n
* @param y input vector of size n
* @param n size of input vectors x and y
* @result scalar product of x and y
*/
int32_t bliss_utils_scalar_product(int32_t *x, int32_t *y, int n);
/**
* Drop d bits but round first
*
* @param set BLISS parameter set
* @param x input vector x of size n
* @param xd rounded vector x with d bits dropped
*/
void bliss_utils_round_and_drop(bliss_param_set_t *set, int32_t *x, int16_t *xd);
/**
* Generate the binary challenge vector c as an array of kappa indices
*
* @param alg hash algorithm to be used for the internal oracle
* @param data_hash hash of the data to be signed
* @param ud input vector ud of size n
* @param set BLISS parameter set to be used (n, n_bits, kappa)
* @param c_indices indexes of non-zero challenge coefficients
*/
bool bliss_utils_generate_c(hash_algorithm_t alg, chunk_t data_hash,
uint16_t *ud, bliss_param_set_t *set,
uint16_t *c_indices);
/**
* Check the infinity and l2 norms of the vectors z1 and z2d << d
*
* @param set BLISS parameter set
* @param z1 input vector
* @param z2d input vector
* @result TRUE if infinite and l2 norms do not exceed boundaries
*/
bool bliss_utils_check_norms(bliss_param_set_t *set, int32_t *z1, int16_t *z2d);
#endif /** BLISS_UTILS_H_ @}*/
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