randpool.h

#ifndef CRYPTOPP_RANDPOOL_H
#define CRYPTOPP_RANDPOOL_H

#include "cryptlib.h"
#include "filters.h"

NAMESPACE_BEGIN(CryptoPP)

//! Randomness Pool
/*! This class can be used to generate
        pseudorandom bytes after seeding the pool with
        the Put() methods */
class CRYPTOPP_DLL RandomPool : public RandomNumberGenerator,
                                   public Bufferless<BufferedTransformation>
{
public:
        //! poolSize must be greater than 16
        RandomPool(unsigned int poolSize=384);

        size_t Put2(const byte *begin, size_t length, int messageEnd, bool blocking);

        bool AnyRetrievable() const {return true;}
        lword MaxRetrievable() const {return ULONG_MAX;}

        size_t TransferTo2(BufferedTransformation &target, lword &transferBytes, const std::string &channel=NULL_CHANNEL, bool blocking=true);
        size_t CopyRangeTo2(BufferedTransformation &target, lword &begin, lword end=LWORD_MAX, const std::string &channel=NULL_CHANNEL, bool blocking=true) const
        {
                throw NotImplemented("RandomPool: CopyRangeTo2() is not supported by this store");
        }

        byte GenerateByte();
        void GenerateBlock(byte *output, size_t size);

        void IsolatedInitialize(const NameValuePairs &parameters) {}

protected:
        void Stir();

private:
        SecByteBlock pool, key;
        size_t addPos, getPos;
};

NAMESPACE_END

#endif

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