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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.
*/
#include "test_suite.h"
#include <bliss_sampler.h>
static u_int key_size[] = { 1, 3, 4};
START_TEST(test_bliss_sampler_gaussian)
{
bliss_sampler_t *sampler;
const bliss_param_set_t *set;
int i, k, count;
uint32_t hist[8], sign[3];
int32_t z;
ext_out_function_t alg;
size_t seed_len;
chunk_t seed;
set = bliss_param_set_get_by_id(key_size[_i]);
alg = XOF_MGF1_SHA256;
seed_len = 32;
count = 10000000;
seed = chunk_alloc(seed_len);
memset(seed.ptr, 0xcc, seed_len);
for (k = 0; k < 3; k++)
{
sign[k] = 0;
}
for (k = 0; k < 8; k++)
{
hist[k] = 0;
}
sampler = bliss_sampler_create(alg, seed, set);
for (i = 0; i < count; i++)
{
ck_assert(sampler->gaussian(sampler, &z));
if (z == 0)
{
sign[1]++;
hist[0]++;
}
else if (z > 0)
{
sign[2]++;
hist[z/256]++;
}
else
{
sign[0]++;
hist[(-z)/256]++;
}
}
sampler->destroy(sampler);
free(seed.ptr);
DBG1(DBG_LIB, "histogram");
for (k = 0; k < 8; k++)
{
DBG1(DBG_LIB, "%d %7d", k, hist[k]);
}
DBG1(DBG_LIB, "- %7d", sign[0]);
DBG1(DBG_LIB, "0 %7d", sign[1]);
DBG1(DBG_LIB, "+ %7d", sign[2]);
}
END_TEST
Suite *bliss_sampler_suite_create()
{
Suite *s;
TCase *tc;
s = suite_create("bliss_sampler");
tc = tcase_create("sampler_gaussian");
tcase_set_timeout(tc, 30);
tcase_add_loop_test(tc, test_bliss_sampler_gaussian, 0, countof(key_size));
suite_add_tcase(s, tc);
return s;
}
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