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Add simple deterministic random number generator for tests

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zugz (tox) 2018-08-02 21:00:43 +01:00 committed by iphydf
parent 3fe0551417
commit fb89c03dd2
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2 changed files with 77 additions and 0 deletions
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75
testing/misc_tools.c
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@ -21,6 +21,10 @@
* You should have received a copy of the GNU General Public License
* along with Tox. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifndef _POSIX_C_SOURCE
// For nanosleep().
#define _POSIX_C_SOURCE 199309L
@ -35,6 +39,10 @@
#include <stdlib.h>
#include <string.h>
#ifndef VANILLA_NACL
#include "sodium.h"
#endif
#if defined(_WIN32) || defined(__WIN32__) || defined(WIN32)
#include <windows.h>
#else
@ -189,3 +197,70 @@ Tox *tox_new_log(struct Tox_Options *options, TOX_ERR_NEW *err, void *log_user_d
{
return tox_new_log_lan(options, err, log_user_data, false);
}
#ifndef VANILLA_NACL
static const char *test_rng_name(void)
{
return "test_rng";
}
static uint32_t rng_state;
static uint32_t test_rng_random(void)
{
rng_state = 2624534371 * rng_state + 1;
return rng_state;
}
static void test_rng_buf(void *const buf, const size_t size)
{
uint8_t *p = (uint8_t *)buf;
uint32_t r = 0;
for (size_t i = 0; i < size; i++) {
if ((i % 4) == 0) {
r = test_rng_random();
}
*p = (r >> ((i % 4) * 8)) & 0xff;
++p;
}
}
static uint32_t test_rng_uniform(const uint32_t upper_bound)
{
// XXX: Not uniform! But that's ok for testing purposes.
return test_rng_random() % upper_bound;
}
static void test_rng_stir(void) { }
static int test_rng_close(void)
{
return 0;
}
static randombytes_implementation test_rng = {
test_rng_name,
test_rng_random,
test_rng_stir,
test_rng_uniform,
test_rng_buf,
test_rng_close
};
/* Simple insecure PRNG for testing purposes */
int use_test_rng(uint32_t seed)
{
rng_state = seed;
return randombytes_set_implementation(&test_rng);
}
#else
int use_test_rng(uint32_t seed)
{
assert(!"libsodium required for use_test_rng");
}
#endif

2
testing/misc_tools.h
View File

@ -22,6 +22,8 @@ void print_debug_log(Tox *m, TOX_LOG_LEVEL level, const char *file, uint32_t lin
Tox *tox_new_log(struct Tox_Options *options, TOX_ERR_NEW *err, void *log_user_data);
Tox *tox_new_log_lan(struct Tox_Options *options, TOX_ERR_NEW *err, void *log_user_data, bool lan_discovery);
int use_test_rng(uint32_t seed);
#ifdef __cplusplus
}
#endif