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/*
* Copyright (c) 2017 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "tmacros.h"
#include <rtems.h>
#include <unistd.h>
#include <assert.h>
const char rtems_test_name[] = "GETENTROPY 1";
#define TEST_MAX_BYTES 32
#define TEST_GUARD_BYTES 32
#define TEST_GUARD 0xA5
static char entropy_buffer1 [TEST_MAX_BYTES + TEST_GUARD_BYTES];
static char entropy_buffer2 [TEST_MAX_BYTES + TEST_GUARD_BYTES];
static char guard_buffer [TEST_MAX_BYTES + TEST_GUARD_BYTES];
static void test_getentropy(size_t nr_bytes)
{
int rv;
size_t try = 1;
/*
* For very small patterns, the probability that two random patterns are the
* same is quite high. Therefore retry the test for these a few times.
*/
if (nr_bytes < 4) {
try = 4;
}
do {
--try;
/* Fill buffers with guard pattern */
memset(entropy_buffer1, TEST_GUARD, sizeof(entropy_buffer1));
memset(entropy_buffer2, TEST_GUARD, sizeof(entropy_buffer2));
memset(guard_buffer, TEST_GUARD, sizeof(entropy_buffer2));
/* Get entropy with the given size */
rv = getentropy(entropy_buffer1, nr_bytes);
assert(rv == 0);
rv = getentropy(entropy_buffer2, nr_bytes);
assert(rv == 0);
/* Check guard pattern */
rv = memcmp(entropy_buffer1 + nr_bytes, guard_buffer + nr_bytes,
sizeof(entropy_buffer1) - nr_bytes);
assert(rv == 0);
rv = memcmp(entropy_buffer2 + nr_bytes, guard_buffer + nr_bytes,
sizeof(entropy_buffer2) - nr_bytes);
assert(rv == 0);
/* Make sure that buffers are not the same */
rv = memcmp(entropy_buffer1, entropy_buffer2, sizeof(entropy_buffer1));
} while (try > 0 && rv == 0);
assert(rv != 0);
}
static void Init(rtems_task_argument arg)
{
size_t i;
TEST_BEGIN();
for (i = 1; i <= TEST_MAX_BYTES; ++i) {
test_getentropy(i);
}
TEST_END();
rtems_test_exit(0);
}
#define CONFIGURE_APPLICATION_DOES_NOT_NEED_CLOCK_DRIVER
#define CONFIGURE_APPLICATION_NEEDS_SIMPLE_CONSOLE_DRIVER
#define CONFIGURE_MAXIMUM_TASKS 1
#define CONFIGURE_INITIAL_EXTENSIONS RTEMS_TEST_INITIAL_EXTENSION
#define CONFIGURE_RTEMS_INIT_TASKS_TABLE
#define CONFIGURE_INIT
#include <rtems/confdefs.h>
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