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// random.cpp
/* Copyright 2012 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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.
*/
#include "mongo/platform/random.h"
#include <stdio.h>
#include <string.h>
#ifndef _WIN32
#include <errno.h>
#endif
#define _CRT_RAND_S
#include <cstdlib>
#include <iostream>
#include <fstream>
#include "mongo/platform/basic.h"
namespace mongo {
// ---- PseudoRandom -----
int32_t PseudoRandom::nextInt32() {
int32_t t = _x ^ (_x << 11);
_x = _y;
_y = _z;
_z = _w;
return _w = _w ^ (_w >> 19) ^ (t ^ (t >> 8));
}
namespace {
const int32_t default_y = 362436069;
const int32_t default_z = 521288629;
const int32_t default_w = 88675123;
}
PseudoRandom::PseudoRandom(int32_t seed) {
_x = seed;
_y = default_y;
_z = default_z;
_w = default_w;
}
PseudoRandom::PseudoRandom(uint32_t seed) {
_x = static_cast<int32_t>(seed);
_y = default_y;
_z = default_z;
_w = default_w;
}
PseudoRandom::PseudoRandom(int64_t seed) {
int32_t high = seed >> 32;
int32_t low = seed & 0xFFFFFFFF;
_x = high ^ low;
_y = default_y;
_z = default_z;
_w = default_w;
}
int64_t PseudoRandom::nextInt64() {
int64_t a = nextInt32();
int64_t b = nextInt32();
return (a << 32) | b;
}
// --- SecureRandom ----
SecureRandom::~SecureRandom() {}
#ifdef _WIN32
class WinSecureRandom : public SecureRandom {
virtual ~WinSecureRandom() {}
int64_t nextInt64() {
uint32_t a, b;
if (rand_s(&a)) {
abort();
}
if (rand_s(&b)) {
abort();
}
return (static_cast<int64_t>(a) << 32) | b;
}
};
SecureRandom* SecureRandom::create() {
return new WinSecureRandom();
}
#elif defined(__linux__) || defined(__sun) || defined(__APPLE__) || defined(__FreeBSD__)
class InputStreamSecureRandom : public SecureRandom {
public:
InputStreamSecureRandom(const char* fn) {
_in = new std::ifstream(fn, std::ios::binary | std::ios::in);
if (!_in->is_open()) {
std::cerr << "can't open " << fn << " " << strerror(errno) << std::endl;
abort();
}
}
~InputStreamSecureRandom() {
delete _in;
}
int64_t nextInt64() {
int64_t r;
_in->read(reinterpret_cast<char*>(&r), sizeof(r));
if (_in->fail()) {
abort();
}
return r;
}
private:
std::ifstream* _in;
};
SecureRandom* SecureRandom::create() {
return new InputStreamSecureRandom("/dev/urandom");
}
#elif defined(__OpenBSD__)
class Arc4SecureRandom : public SecureRandom {
public:
int64_t nextInt64() {
int64_t value;
arc4random_buf(&value, sizeof(value));
return value;
}
};
SecureRandom* SecureRandom::create() {
return new Arc4SecureRandom();
}
#else
#error Must implement SecureRandom for platform
#endif
}
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