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/* Copyright 2022 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Measure performance of the hardware True Random Number Generator (TRNG)
* compared to the std::rand().
*/
#include "benchmark.h"
#include "console.h"
#include <array>
#include <cstdint>
#include <cstdlib>
extern "C" {
#include "test_util.h"
#include "trng.h"
}
test_static int test_rng()
{
constexpr int num_iterations = 100;
Benchmark benchmark({ .num_iterations = num_iterations });
std::array<uint32_t, num_iterations> trng_out;
std::array<int, num_iterations> rand_out;
// Try the hardware true random number generator
trng_out.fill(0);
trng_init();
auto result = benchmark.run("trng", [&trng_out]() {
static int i = 0;
trng_rand_bytes(&trng_out[i++], sizeof(uint32_t));
});
trng_exit();
TEST_ASSERT(result.has_value());
for (int i = 0; i < trng_out.size() - 1; ++i) {
TEST_NE(trng_out[i], trng_out[i + 1], "%d");
cflush();
}
// Repeat the test by turning the TNRG on and off at each iteration
trng_out.fill(0);
result = benchmark.run("trng_on_off", [&trng_out]() {
trng_init();
static int i = 0;
trng_rand_bytes(&trng_out[i++], sizeof(uint32_t));
trng_exit();
});
TEST_ASSERT(result.has_value());
for (int i = 0; i < trng_out.size() - 1; ++i) {
TEST_NE(trng_out[i], trng_out[i + 1], "%d");
cflush();
}
// Repeat the test using std::rand() for comparison
rand_out.fill(0);
result = benchmark.run("std::rand", [&rand_out]() {
static int i = 0;
rand_out[i++] = std::rand();
});
TEST_ASSERT(result.has_value());
for (int i = 0; i < rand_out.size() - 1; ++i) {
TEST_NE(rand_out[i], rand_out[i + 1], "%d");
cflush();
}
benchmark.print_results();
return EC_SUCCESS;
}
void run_test(int argc, const char **argv)
{
test_reset();
RUN_TEST(test_rng);
test_print_result();
}
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