/usr/include/mongo/platform/random.h is in mongodb-dev 1:2.4.9-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/* 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.
*/
#pragma once
#include "mongo/platform/cstdint.h"
namespace mongo {
/**
* Uses http://en.wikipedia.org/wiki/Xorshift
*/
class PseudoRandom {
public:
PseudoRandom( int32_t seed );
PseudoRandom( uint32_t seed );
PseudoRandom( int64_t seed );
int32_t nextInt32();
int64_t nextInt64();
/**
* @return a number between 0 and max
*/
int32_t nextInt32( int32_t max ) { return nextInt32() % max; }
private:
int32_t _x;
int32_t _y;
int32_t _z;
int32_t _w;
};
/**
* More secure random numbers
* Suitable for nonce/crypto
* Slower than PseudoRandom, so only use when really need
*/
class SecureRandom {
public:
virtual ~SecureRandom();
virtual int64_t nextInt64() = 0;
static SecureRandom* create();
};
}
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