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72 lines
2.8 KiB
C++
72 lines
2.8 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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//! \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. At version 5.5
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//! RandomPool was redesigned to reduce the risk of reusing random numbers after state
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//! rollback (which may occur when running in a virtual machine like VMware or a hosted
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//! environment).
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//! \details If you need the pre-Crypto++ 5.5 generator then you can find it with:
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//! <pre>
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//! $ git clone https://github.com/weidai11/cryptopp cryptopp-ancient
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//! $ cryptopp-ancient
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//!
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//! # Checkout the RandomPool change
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//! $ git checkout f41245df6fb9b85574260eca9cd32777e8ab5136
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//!
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//! # Go back one more
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//! git checkout HEAD~1
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//!
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//! $ grep 'MDC<SHA>' *.h *.cpp
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//! randpool.cpp:typedef MDC<SHA> RandomPoolCipher;
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//! </pre>
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//! \since Crypto++ 4.0 (PGP 2.6.x style), Crypto++ 5.5 (AES-256 based)
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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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//! \class RandomPool
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//! \brief Randomness Pool based on AES-256
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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. At version 5.5
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//! RandomPool was redesigned to reduce the risk of reusing random numbers after state
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//! rollback (which may occur when running in a virtual machine like VMware or a hosted
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//! environment).
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//! \since Crypto++ 4.0 (PGP 2.6.x style), Crypto++ 5.5 (AES-256 based)
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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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