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48 lines
1.6 KiB
C++
48 lines
1.6 KiB
C++
// randpool.h - written and placed in the public domain by Wei Dai
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//! \file randpool.h
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//! \brief Class file for Randomness Pool
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#ifndef CRYPTOPP_RANDPOOL_H
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#define CRYPTOPP_RANDPOOL_H
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#include "cryptlib.h"
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#include "filters.h"
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#include "secblock.h"
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#include "smartptr.h"
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#include "aes.h"
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NAMESPACE_BEGIN(CryptoPP)
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//! \brief Randomness Pool
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//! \details RandomPool can be used to generate cryptographic quality pseudorandom bytes
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//! after seeding the pool with IncorporateEntropy(). Internally, the generator uses
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//! AES-256 to produce the stream. Entropy is stirred in using SHA-256.
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//! \details RandomPool used to follow the design of randpool in PGP 2.6.x,
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//! but as of version 5.5 it has been redesigned to reduce the risk
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//! of reusing random numbers after state rollback (which may occur
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//! when running in a virtual machine like VMware).
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class CRYPTOPP_DLL RandomPool : public RandomNumberGenerator, public NotCopyable
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{
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public:
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//! \brief Construct a RandomPool
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RandomPool();
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bool CanIncorporateEntropy() const {return true;}
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void IncorporateEntropy(const byte *input, size_t length);
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void GenerateIntoBufferedTransformation(BufferedTransformation &target, const std::string &channel, lword size);
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// for backwards compatibility. use RandomNumberSource, RandomNumberStore, and RandomNumberSink for other BufferTransformation functionality
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void Put(const byte *input, size_t length) {IncorporateEntropy(input, length);}
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private:
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FixedSizeAlignedSecBlock<byte, 16, true> m_seed;
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FixedSizeAlignedSecBlock<byte, 32> m_key;
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member_ptr<BlockCipher> m_pCipher;
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bool m_keySet;
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};
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NAMESPACE_END
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#endif
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