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105 lines
4.6 KiB
C++
105 lines
4.6 KiB
C++
// randpool.h - originally written and placed in the public domain by Wei Dai
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// OldRandPool added by JW in August, 2017.
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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 use OldRandomPool class. You
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/// should migrate away from OldRandomPool at the earliest opportunity. Use RandomPool
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/// or AutoSeededRandomPool instead.
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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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/// \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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/// \details You should reseed the generator after a fork() to avoid multiple generators
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/// with the same internal state.
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/// \details If you need the pre-Crypto++ 5.5 generator then use OldRandomPool class. You
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/// should migrate away from OldRandomPool at the earliest opportunity.
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/// \sa OldRandomPool
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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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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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/// \brief Randomness Pool based on PGP 2.6.x with MDC
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/// \details If you need the pre-Crypto++ 5.5 generator then use OldRandomPool class. The
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/// OldRandomPool also provides the modern interface, including <tt>CanIncorporateEntropy</tt>,
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/// <tt>IncorporateEntropy</tt> and <tt>GenerateIntoBufferedTransformation</tt>.
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/// \details You should reseed the generator after a fork() to avoid multiple generators
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/// with the same internal state.
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/// \details You should migrate away from OldRandomPool at the earliest opportunity. Use a
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/// modern random number generator or key derivation function, like AutoSeededRandomPool or
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/// HKDF.
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/// \warning This class uses an old style PGP 2.6.x with MDC. The generator risks reusing
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/// random numbers after state rollback. You should migrate away from OldRandomPool at
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/// the earliest opportunity.
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/// \sa RandomPool, AutoSeededRandomPool, HKDF, P1363_KDF2, PKCS12_PBKDF, PKCS5_PBKDF2_HMAC
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/// \since Crypto++ 6.0
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class CRYPTOPP_DLL OldRandomPool : public RandomNumberGenerator
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{
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public:
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/// \brief Construct an OldRandomPool
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/// \param poolSize internal pool size of the generator
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/// \details poolSize must be greater than 16
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OldRandomPool(unsigned int poolSize=384);
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// RandomNumberGenerator interface (Crypto++ 5.5 and above)
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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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byte GenerateByte();
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void GenerateBlock(byte *output, size_t size);
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// GenerateWord32 is overridden and provides Crypto++ 5.4 behavior.
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// Taken from RandomNumberSource::GenerateWord32 in cryptlib.cpp.
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word32 GenerateWord32 (word32 min=0, word32 max=0xffffffffUL);
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protected:
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void Stir();
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private:
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SecByteBlock pool, key;
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size_t addPos, getPos;
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};
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NAMESPACE_END
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#endif
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