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/*
Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
MA 02110-1301 USA.
*/
/* random.hpp provides a crypto secure Random Number Generator using an OS
specific seed
*/
#ifndef TAO_CRYPT_RANDOM_HPP
#define TAO_CRYPT_RANDOM_HPP
#include "arc4.hpp"
#include "error.hpp"
namespace TaoCrypt {
// OS specific seeder
class OS_Seed {
public:
OS_Seed();
~OS_Seed();
void GenerateSeed(byte*, word32 sz);
Error GetError() const { return error_; }
private:
#if defined(_WIN32)
#if defined(_WIN64)
typedef unsigned __int64 ProviderHandle;
// type HCRYPTPROV, avoid #include <windows.h>
#else
typedef unsigned long ProviderHandle;
#endif
ProviderHandle handle_;
#else
int fd_;
#endif
Error error_;
OS_Seed(const OS_Seed&); // hide copy
OS_Seed& operator=(const OS_Seed&); // hide assign
};
// secure Random Nnumber Generator
class RandomNumberGenerator {
public:
RandomNumberGenerator();
~RandomNumberGenerator() {}
void GenerateBlock(byte*, word32 sz);
byte GenerateByte();
ErrorNumber GetError() const { return seed_.GetError().What(); }
private:
OS_Seed seed_;
ARC4 cipher_;
RandomNumberGenerator(const RandomNumberGenerator&); // hide copy
RandomNumberGenerator operator=(const RandomNumberGenerator&); // && assign
};
} // namespace
#endif // TAO_CRYPT_RANDOM_HPP
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