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Annotation of embedaddon/strongswan/src/libstrongswan/plugins/bliss/bliss_sampler.h, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Copyright (C) 2014 Andreas Steffen
                      3:  * HSR Hochschule fuer Technik Rapperswil
                      4:  *
                      5:  * This program is free software; you can redistribute it and/or modify it
                      6:  * under the terms of the GNU General Public License as published by the
                      7:  * Free Software Foundation; either version 2 of the License, or (at your
                      8:  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
                      9:  *
                     10:  * This program is distributed in the hope that it will be useful, but
                     11:  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     12:  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
                     13:  * for more details.
                     14:  */
                     15: 
                     16: /**
                     17:  * @defgroup bliss_sampler bliss_sampler
                     18:  * @{ @ingroup bliss_p
                     19:  */
                     20: 
                     21: #ifndef BLISS_SAMPLER_H_
                     22: #define BLISS_SAMPLER_H_
                     23: 
                     24: typedef struct bliss_sampler_t bliss_sampler_t;
                     25: 
                     26: #include "bliss_param_set.h"
                     27: 
                     28: #include <library.h>
                     29: #include <crypto/hashers/hasher.h>
                     30: 
                     31: /**
                     32:  * Implementation various rejection sampling algorithms.
                     33:  */
                     34: struct bliss_sampler_t {
                     35: 
                     36:        /**
                     37:         * Sample according to exp(-x/(2*sigma^2))
                     38:         *
                     39:         * @param x                     Value to be sampled
                     40:         * @param accepted      TRUE if value is accepted, FALSE if rejected
                     41:         * @result                      TRUE if sampling was successful
                     42:         */
                     43:        bool (*bernoulli_exp)(bliss_sampler_t *this, uint32_t x, bool *accepted);
                     44: 
                     45:        /**
                     46:         * Sample according to 1/cosh(x/sigma^2)
                     47:         *
                     48:         * @param x                     Value to be sampled
                     49:         * @param accepted      TRUE if value is accepted, FALSE if rejected
                     50:         * @result                      TRUE if sampling was successful
                     51:         */
                     52:        bool (*bernoulli_cosh)(bliss_sampler_t *this, int32_t x, bool *accepted);
                     53: 
                     54:        /**
                     55:         * Sample according to 2^(-x^2) for positive x
                     56:         *
                     57:         * @param x                     Generated value
                     58:         * @result                      TRUE if sampling was successful
                     59:         */
                     60:        bool (*pos_binary)(bliss_sampler_t *this, uint32_t *x);
                     61: 
                     62:        /**
                     63:         * Sample according to the Gaussian distribution exp(-x^2/(2*sigma^2))
                     64:         *
                     65:         * @param z                     Generated value with Gaussian distribution
                     66:         * @result                      TRUE if sampling was successful
                     67:         */
                     68:        bool (*gaussian)(bliss_sampler_t *this, int32_t *z);
                     69: 
                     70:        /**
                     71:         * Sample the sign according to the binary distribution
                     72:         *
                     73:         * @param positive      TRUE if positive
                     74:         * @result                      TRUE if sampling was successful
                     75:         */
                     76:        bool (*sign)(bliss_sampler_t *this, bool *positive);
                     77: 
                     78:        /**
                     79:         * Destroy bliss_sampler_t object
                     80:         */
                     81:        void (*destroy)(bliss_sampler_t *this);
                     82: };
                     83: 
                     84: /**
                     85:  * Create a bliss_sampler_t object.
                     86:  *
                     87:  * @param alg          XOF to be used for the internal bitspender
                     88:  * @param seed         Seed used to initialize the internal bitspender
                     89:  * @param set          BLISS parameter set to be used
                     90:  */
                     91: bliss_sampler_t *bliss_sampler_create(ext_out_function_t alg, chunk_t seed,
                     92:                                                                          const bliss_param_set_t *set);
                     93: 
                     94: #endif /** BLISS_SAMPLER_H_ @}*/