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// random.cpp
/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kDefault
#include "mongo/platform/basic.h"
#include "mongo/platform/random.h"
#include <string.h>
#ifdef _WIN32
#include <bcrypt.h>
#else
#include <errno.h>
#endif
#define _CRT_RAND_S
#include <cstdlib>
#include <fstream>
#include <iostream>
#include <limits>
#include "mongo/stdx/memory.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/log.h"
namespace mongo {
// ---- PseudoRandom -----
uint32_t PseudoRandom::nextUInt32() {
uint32_t t = _x ^ (_x << 11);
_x = _y;
_y = _z;
_z = _w;
return _w = _w ^ (_w >> 19) ^ (t ^ (t >> 8));
}
namespace {
const uint32_t default_y = 362436069;
const uint32_t default_z = 521288629;
const uint32_t default_w = 88675123;
} // namespace
PseudoRandom::PseudoRandom(uint32_t seed) {
_x = seed;
_y = default_y;
_z = default_z;
_w = default_w;
}
PseudoRandom::PseudoRandom(int32_t seed) : PseudoRandom(static_cast<uint32_t>(seed)) {}
PseudoRandom::PseudoRandom(int64_t seed)
: PseudoRandom(static_cast<uint32_t>(seed >> 32) ^ static_cast<uint32_t>(seed)) {}
int32_t PseudoRandom::nextInt32() {
return nextUInt32();
}
int64_t PseudoRandom::nextInt64() {
uint64_t a = nextUInt32();
uint64_t b = nextUInt32();
return (a << 32) | b;
}
double PseudoRandom::nextCanonicalDouble() {
double result;
do {
auto generated = static_cast<uint64_t>(nextInt64());
result = static_cast<double>(generated) / std::numeric_limits<uint64_t>::max();
} while (result == 1.0);
return result;
}
// --- SecureRandom ----
SecureRandom::~SecureRandom() {}
#ifdef _WIN32
class WinSecureRandom : public SecureRandom {
public:
WinSecureRandom() {
auto ntstatus = ::BCryptOpenAlgorithmProvider(
&_algHandle, BCRYPT_RNG_ALGORITHM, MS_PRIMITIVE_PROVIDER, 0);
if (ntstatus != STATUS_SUCCESS) {
error() << "Failed to open crypto algorithm provider while creating secure random "
"object; NTSTATUS: "
<< ntstatus;
fassertFailed(28815);
}
}
virtual ~WinSecureRandom() {
auto ntstatus = ::BCryptCloseAlgorithmProvider(_algHandle, 0);
if (ntstatus != STATUS_SUCCESS) {
warning() << "Failed to close crypto algorithm provider destroying secure random "
"object; NTSTATUS: "
<< ntstatus;
}
}
int64_t nextInt64() {
int64_t value;
auto ntstatus =
::BCryptGenRandom(_algHandle, reinterpret_cast<PUCHAR>(&value), sizeof(value), 0);
if (ntstatus != STATUS_SUCCESS) {
error() << "Failed to generate random number from secure random object; NTSTATUS: "
<< ntstatus;
fassertFailed(28814);
}
return value;
}
private:
BCRYPT_ALG_HANDLE _algHandle;
};
std::unique_ptr<SecureRandom> SecureRandom::create() {
return stdx::make_unique<WinSecureRandom>();
}
#elif defined(__linux__) || defined(__sun) || defined(__APPLE__) || defined(__FreeBSD__) || \
defined(__EMSCRIPTEN__)
class InputStreamSecureRandom : public SecureRandom {
public:
InputStreamSecureRandom(const char* fn) {
_in = stdx::make_unique<std::ifstream>(fn, std::ios::binary | std::ios::in);
if (!_in->is_open()) {
error() << "cannot open " << fn << " " << strerror(errno);
fassertFailed(28839);
}
}
int64_t nextInt64() {
int64_t r;
_in->read(reinterpret_cast<char*>(&r), sizeof(r));
if (_in->fail()) {
error() << "InputStreamSecureRandom failed to generate random bytes";
fassertFailed(28840);
}
return r;
}
private:
std::unique_ptr<std::ifstream> _in;
};
std::unique_ptr<SecureRandom> SecureRandom::create() {
return stdx::make_unique<InputStreamSecureRandom>("/dev/urandom");
}
#elif defined(__OpenBSD__)
class Arc4SecureRandom : public SecureRandom {
public:
int64_t nextInt64() {
int64_t value;
arc4random_buf(&value, sizeof(value));
return value;
}
};
std::unique_ptr<SecureRandom> SecureRandom::create() {
return stdx::make_unique<Arc4SecureRandom>();
}
#else
#error Must implement SecureRandom for platform
#endif
} // namespace mongo
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