mirror of
https://github.com/ton-blockchain/ton
synced 2025-03-09 15:40:10 +00:00
77 lines
2.1 KiB
C++
77 lines
2.1 KiB
C++
/*
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This file is part of TON Blockchain Library.
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TON Blockchain Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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TON Blockchain Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2017-2020 Telegram Systems LLP
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*/
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#pragma once
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#include "td/utils/common.h"
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#include "td/utils/Slice.h"
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#include "td/utils/Span.h"
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namespace td {
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class Random {
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public:
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#if TD_HAVE_OPENSSL
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static void secure_bytes(MutableSlice dest);
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static void secure_bytes(unsigned char *ptr, size_t size);
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static int32 secure_int32();
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static int64 secure_int64();
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static uint32 secure_uint32();
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static uint64 secure_uint64();
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// works only for current thread
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static void add_seed(Slice bytes, double entropy = 0);
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static void secure_cleanup();
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#endif
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static uint32 fast_uint32();
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static uint64 fast_uint64();
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// distribution is not uniform, min and max are included
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static int fast(int min, int max);
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static double fast(double min, double max);
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class Fast {
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public:
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uint64 operator()() {
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return fast_uint64();
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}
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};
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class Xorshift128plus {
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public:
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explicit Xorshift128plus(uint64 seed);
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Xorshift128plus(uint64 seed_a, uint64 seed_b);
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uint64 operator()();
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int fast(int min, int max);
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int64 fast64(int64 min, int64 max);
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void bytes(MutableSlice dest);
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private:
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uint64 seed_[2];
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};
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};
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template <class T, class R>
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void random_shuffle(td::MutableSpan<T> v, R &rnd) {
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for (std::size_t i = 1; i < v.size(); i++) {
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auto pos = static_cast<std::size_t>(rnd() % (i + 1));
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std::swap(v[i], v[pos]);
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}
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}
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} // namespace td
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