tdlight/tdutils/td/utils/Random.h

48 lines
1.1 KiB
C
Raw Normal View History

//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once
#include "td/utils/common.h"
#include "td/utils/Slice.h"
namespace td {
class Random {
public:
#if TD_HAVE_OPENSSL
static void secure_bytes(MutableSlice dest);
static void secure_bytes(unsigned char *ptr, size_t size);
static int32 secure_int32();
static int64 secure_int64();
static uint32 secure_uint32();
static uint64 secure_uint64();
// works only for current thread
static void add_seed(Slice bytes, double entropy = 0);
#endif
static uint32 fast_uint32();
static uint64 fast_uint64();
// distribution is not uniform, min and max are included
static int fast(int min, int max);
class Xorshift128plus {
public:
explicit Xorshift128plus(uint64 seed);
Xorshift128plus(uint64 seed_a, uint64 seed_b);
uint64 operator()();
int fast(int min, int max);
void bytes(MutableSlice dest);
private:
uint64 seed_[2];
};
};
} // namespace td