47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
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// Copyright (c) 2017 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include "random.h"
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#include "test/test_bitcoin.h"
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#include <boost/test/unit_test.hpp>
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BOOST_FIXTURE_TEST_SUITE(random_tests, BasicTestingSetup)
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static const ssize_t MAX_TRIES = 1024;
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BOOST_AUTO_TEST_CASE(osrandom_tests)
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{
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/* This does not measure the quality of randomness, but it does test that
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* OSRandom() overwrites all 32 bytes of the output given a maximum
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* number of tries.
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*/
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uint8_t data[NUM_OS_RANDOM_BYTES];
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bool overwritten[NUM_OS_RANDOM_BYTES] = {}; /* Tracks which bytes have been overwritten at least once */
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int num_overwritten;
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int tries = 0;
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/* Loop until all bytes have been overwritten at least once */
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do {
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memset(data, 0, NUM_OS_RANDOM_BYTES);
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GetOSRand(data);
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for (int x=0; x < NUM_OS_RANDOM_BYTES; ++x) {
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overwritten[x] |= (data[x] != 0);
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}
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num_overwritten = 0;
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for (int x=0; x < NUM_OS_RANDOM_BYTES; ++x) {
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if (overwritten[x]) {
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num_overwritten += 1;
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}
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}
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tries += 1;
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} while (num_overwritten < NUM_OS_RANDOM_BYTES && tries < MAX_TRIES);
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BOOST_CHECK(num_overwritten == NUM_OS_RANDOM_BYTES); /* If this failed, bailed out after too many tries */
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}
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BOOST_AUTO_TEST_SUITE_END()
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