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// random.cpp
/* Copyright 2012 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#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(__sunos__) || defined(__APPLE__)
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" );
}
#else
class SRandSecureRandom : public SecureRandom {
public:
SRandSecureRandom() {
srandomdev();
}
int64_t nextInt64() {
long a, b;
a = random();
b = random();
return ( static_cast<int64_t>(a) << 32 ) | b;
}
};
SecureRandom* SecureRandom::create() {
return new SRandSecureRandom();
}
#endif
}
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