randpool.h

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// randpool.h - originally written and placed in the public domain by Wei Dai
//              OldRandPool added by JW in August, 2017.
 
 
#ifndef CRYPTOPP_RANDPOOL_H
#define CRYPTOPP_RANDPOOL_H
 
#include "cryptlib.h"
#include "filters.h"
#include "secblock.h"
#include "smartptr.h"
#include "aes.h"
 
NAMESPACE_BEGIN(CryptoPP)
 
 
class CRYPTOPP_DLL RandomPool : public RandomNumberGenerator, public NotCopyable
{
public:
        RandomPool();
 
        bool CanIncorporateEntropy() const {return true;}
        void IncorporateEntropy(const byte *input, size_t length);
        void GenerateIntoBufferedTransformation(BufferedTransformation &target, const std::string &channel, lword size);
 
private:
        FixedSizeAlignedSecBlock<byte, 16, true> m_seed;
        FixedSizeAlignedSecBlock<byte, 32> m_key;
        member_ptr<BlockCipher> m_pCipher;
        bool m_keySet;
};
 
class CRYPTOPP_DLL OldRandomPool : public RandomNumberGenerator
{
public:
        OldRandomPool(unsigned int poolSize=384);
 
        // RandomNumberGenerator interface (Crypto++ 5.5 and above)
        bool CanIncorporateEntropy() const {return true;}
        void IncorporateEntropy(const byte *input, size_t length);
        void GenerateIntoBufferedTransformation(BufferedTransformation &target, const std::string &channel, lword size);
 
        byte GenerateByte();
        void GenerateBlock(byte *output, size_t size);
 
        // GenerateWord32 is overridden and provides Crypto++ 5.4 behavior.
        // Taken from RandomNumberSource::GenerateWord32 in cryptlib.cpp.
        word32 GenerateWord32 (word32 min=0, word32 max=0xffffffffUL);
 
protected:
        void Stir();
 
private:
        SecByteBlock pool, key;
        size_t addPos, getPos;
};
 
NAMESPACE_END
 
#endif