afb81b8278
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55 lines
1.1 KiB
C++
55 lines
1.1 KiB
C++
// This file is part of Desktop App Toolkit,
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// a set of libraries for developing nice desktop applications.
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//
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// For license and copyright information please follow this link:
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// https://github.com/desktop-app/legal/blob/master/LEGAL
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//
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#include "base/random.h"
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extern "C" {
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#include <openssl/rand.h>
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} // extern "C"
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namespace base {
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namespace {
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template <typename Next>
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int RandomIndex(int count, Next &&next) {
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Expects(count > 0);
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if (count == 1) {
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return 0;
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}
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const auto max = (std::numeric_limits<uint32>::max() / count) * count;
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while (true) {
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const auto random = next();
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if (random < max) {
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return int(random % count);
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}
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}
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}
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} // namespace
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void RandomFill(bytes::span bytes) {
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const auto result = RAND_bytes(
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reinterpret_cast<unsigned char*>(bytes.data()),
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bytes.size());
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Ensures(result);
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}
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int RandomIndex(int count) {
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return RandomIndex(count, [] { return RandomValue<uint32>(); });
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}
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int RandomIndex(int count, BufferedRandom<uint32> buffered) {
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return RandomIndex(count, [&] { return buffered.next(); });
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}
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void RandomAddSeed(bytes::const_span bytes) {
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RAND_seed(bytes.data(), bytes.size());
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}
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} // namespace base
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