RAND: rm obsolete implementation
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src/rand.c
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src/rand.c
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/*
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* Copyright (C) 2014 FH Bielefeld
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*
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* This file is part of a FH Bielefeld project.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#include "context.h"
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#include "err.h"
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#include <fcntl.h>
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#include "rand.h"
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#include <math.h>
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#include "poly.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <tompoly.h>
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#include <tommath.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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/*
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* static declarations
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*/
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static mp_digit get_int_dev_random(void);
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static mp_digit get_int_dev_urandom(void);
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static mp_digit get_random_ternary(mp_digit random_int, int* sign);
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static mp_int *get_random_bigint(mp_int *upper_bound,
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mp_int *lower_bound,
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int entropy_source);
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static uint32_t check_allowed_zeros(pb_poly *polynom);
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/**
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* Reads a single mp_digit out of /dev/random and returns this mp_digit
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*
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* @return the randomly chosen integer
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*/
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static mp_digit get_int_dev_random(void)
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{
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int random_data;
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mp_digit random_int;
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size_t random_DataLen = 0;
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random_data = open("/dev/random", O_RDONLY);
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while (random_DataLen < sizeof(random_int)) {
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ssize_t result = read(random_data,
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((char*) &random_int) + random_DataLen,
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(sizeof(random_int)) - random_DataLen);
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if (result < 0) {
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NTRU_ABORT("Unable to read /dev/random.\n");
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}
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random_DataLen += result;
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}
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close(random_data);
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return random_int;
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}
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/**
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* Reads a single mp_digit out of /dev/urandom and returns this mp_digit
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*
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* @return the randomly chosen integer
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*/
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static mp_digit get_int_dev_urandom(void)
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{
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int random_data;
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mp_digit random_int;
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ssize_t result;
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random_data = open("/dev/urandom", O_RDONLY);
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random_data = open("/dev/urandom", O_RDONLY);
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if ((result = read(random_data, &random_int, sizeof(random_int))) < 0)
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NTRU_ABORT("Unable to read /dev/urandom.\n");
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close(random_data);
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return random_int;
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}
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/**
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* Makes a small integer from the set {-1, 0, 1}
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* out of a randomly chosen integer.
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* A zero is signed positiv.
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*
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* @param random_int a randomly chosen mp_digit
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* @param sign an integer to store the sign (1==positiv) [out]
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* @return random small integer from the set {-1, 0, 1}
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*/
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static mp_digit get_random_ternary(mp_digit random_int, int* sign)
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{
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random_int = random_int % 3;
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if (random_int == 1) {
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*sign = 0;
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} else if (random_int == 2) {
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random_int = 1;
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*sign = 1;
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} else {
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random_int = 1;
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*sign = 0;
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}
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return random_int;
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}
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/**
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* Makes a big integer from the borders of upper_bound
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* and lower_bound out of a randomly chosen integer.
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*
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* @param upper_bound the maximal upper border of the resulting mp_int [out]
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* @param lower_bound the minimal lower border of the resulting mp_int [out]
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* entropy_source random_int TODO
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* @return a mp_int with the random number
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*/
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static mp_int *get_random_bigint(mp_int *upper_bound,
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mp_int *lower_bound,
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int entropy_source)
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{
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mp_int *result = NULL;
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init_integer(result);
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//TODO
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return result;
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}
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/**
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* Checks if the coefficients of a polynom are less than
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* PERCENTAGE_OF_ZERO_ALLOWED zero
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*
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* @param polynom a pointer to the polynom you want to test [out]
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* @return 0 if the polynom zero coefficients are under
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* PERCENTAGE_OF_ZERO_ALLOWED percent
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* -1 if the polynom zero coefficients are over
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* PERCENTAGE_OF_ZERO_ALLOWED percent
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*/
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static uint32_t check_allowed_zeros(pb_poly *polynom)
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{
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uint32_t result = -1;
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//TODO
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return result;
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}
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/**
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* Gets a random polynomial with coefficients
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* from the set {-1 ,0 ,1} using the given entropy source
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*
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* @param length the amount of coefficients
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* @param entropy_source the source of entropy you want
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* @return newly allocated polynomial, must be freed with delete_polynom()
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*/
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pb_poly *ntru_get_random_poly_ternary(size_t length, int entropy_source)
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{
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mp_int chara;
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init_integer(&chara);
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mp_digit coefficient;
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pb_poly *poly = malloc(sizeof(pb_poly));
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init_polynom_size(poly, &chara, length);
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mp_clear(&chara);
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for (uint32_t i = 0; i < length; i++) {
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int sign;
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if (entropy_source == GET_INT_FROM_RRAND) {
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coefficient = get_int_dev_random();
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} else if (entropy_source == GET_INT_FROM_URAND) {
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coefficient = get_int_dev_urandom();
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} else {
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NTRU_ABORT("No suitable entropy source selectetd.\n");
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}
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coefficient = get_random_ternary(coefficient, &sign);
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mp_set(&(poly->terms[i]), coefficient);
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if (sign == 1)
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poly->terms[i].sign = 1;
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}
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poly->used = length;
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return poly;
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}
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/**
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* Gets a random polynomial with coefficients
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* from the the borders of lower_bound to upper_bound
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* using the given entropy source
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*
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* @param length the amount of coefficients
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* @param entropy_source the source of entropy you want
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* @return newly allocated polynomial, must be freed with delete_polynom()
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*/
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pb_poly *ntru_get_random_poly(int length,
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int entropy_source,
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mp_int *upper_bound,
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mp_int *lower_bound)
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{
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//TODO
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return NULL;
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}
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48
src/rand.h
48
src/rand.h
@ -1,48 +0,0 @@
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/*
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* Copyright (C) 2014 FH Bielefeld
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*
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* This file is part of a FH Bielefeld project.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#ifndef NTRU_RAND_H
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#define NTRU_RAND_H
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#include "context.h"
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#include <tompoly.h>
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/**
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* Use the /dev/urandom device as entropy source.
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*/
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#define GET_INT_FROM_URAND 2
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/**
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* Use the /dev/random device as entropy source.
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*/
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#define GET_INT_FROM_RRAND 3
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pb_poly *ntru_get_random_poly_ternary(size_t length, int entropy_source);
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pb_poly *ntru_get_random_poly(int length,
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int entropy_source,
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mp_int *upper_bound,
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mp_int *lower_bound);
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#endif /* NTRU_RAND_H */
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