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