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Diffstat (limited to 'testsuites/libtests/getentropy01/init.c')
-rw-r--r-- | testsuites/libtests/getentropy01/init.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/testsuites/libtests/getentropy01/init.c b/testsuites/libtests/getentropy01/init.c new file mode 100644 index 0000000000..aea2e8bc73 --- /dev/null +++ b/testsuites/libtests/getentropy01/init.c @@ -0,0 +1,102 @@ +/* + * 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> |