---

osrng.h

#ifndef CRYPTOPP_OSRNG_H
#define CRYPTOPP_OSRNG_H

#include "config.h"

#if !defined(NO_OS_DEPENDENCE)

#include "randpool.h"

NAMESPACE_BEGIN(CryptoPP)

class OS_RNG_Err : public Exception
{
public:
        OS_RNG_Err(const std::string &s) : Exception(s) {}
};

#if ((defined(_WIN32) && defined(USE_MS_CRYPTOAPI)) || defined(__FreeBSD__) || defined(__linux__))

#define NONBLOCKING_RNG_AVAILABLE

class NonblockingRng : public RandomNumberGenerator
{
public:
        NonblockingRng();
        ~NonblockingRng();
        byte GenerateByte();
        void GenerateBlock(byte *output, unsigned int size);

protected:
#ifdef _WIN32
        unsigned long m_hProvider;
#else
        int m_fd;
#endif
};

#endif

#if (defined(__FreeBSD__) || defined(__linux__))

#define BLOCKING_RNG_AVAILABLE

class BlockingRng : public RandomNumberGenerator
{
public:
        BlockingRng();
        ~BlockingRng();
        byte GenerateByte();
        void GenerateBlock(byte *output, unsigned int size);

protected:
        int m_fd;
};

#endif

#if defined(NONBLOCKING_RNG_AVAILABLE) || defined(BLOCKING_RNG_AVAILABLE)

#define AUTO_SEEDED_RANDOM_POOL_AVAILABLE


class AutoSeededRandomPool : public RandomPool
{
public:
        explicit AutoSeededRandomPool(bool blocking = false, unsigned int seedSize = 16)
                {Reseed(blocking, seedSize);}
        void Reseed(bool blocking = false, unsigned int seedSize = 16);
};

#endif

NAMESPACE_END

#endif  // #if !defined(NO_OS_DEPENDENCE)

#endif

---