mbedtls/tests/suites/test_suite_timing.function

/* BEGIN_HEADER */

/* This test module exercises the timing module. Since, depending on the
 * underlying operating system, the timing routines are not always reliable,
 * this suite only performs very basic sanity checks of the timing API.
 */

#include <limits.h>

#include "mbedtls/timing.h"

/* END_HEADER */

/* BEGIN_DEPENDENCIES
 * depends_on:MBEDTLS_TIMING_C
 * END_DEPENDENCIES
 */

/* BEGIN_CASE */
void timing_get_timer()
{
    struct mbedtls_timing_hr_time time;

    memset(&time, 0, sizeof(time));

    (void) mbedtls_timing_get_timer(&time, 1);

    /* Check that a non-zero time was written back */
    int all_zero = 1;
    for (size_t i = 0; i < sizeof(time); i++) {
        all_zero &= ((unsigned char *) &time)[i] == 0;
    }
    TEST_ASSERT(!all_zero);

    (void) mbedtls_timing_get_timer(&time, 0);

    /* This goto is added to avoid warnings from the generated code. */
    goto exit;
}
/* END_CASE */

/* BEGIN_CASE */
void timing_delay(int fin_ms)
{
    mbedtls_timing_delay_context ctx;
    int result;
    if (fin_ms == 0) {
        mbedtls_timing_set_delay(&ctx, 0, 0);
        result = mbedtls_timing_get_delay(&ctx);
        TEST_ASSERT(result == -1);
    } else {
        mbedtls_timing_set_delay(&ctx, fin_ms / 2, fin_ms);
        result = mbedtls_timing_get_delay(&ctx);
        TEST_ASSERT(result >= 0 && result <= 2);
    }
}
/* END_CASE */