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50 lines
1.5 KiB
50 lines
1.5 KiB
// seal.h - written and placed in the public domain by Wei Dai |
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//! \file seal.h |
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//! \brief Classes for SEAL stream cipher |
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#ifndef CRYPTOPP_SEAL_H |
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#define CRYPTOPP_SEAL_H |
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#include "strciphr.h" |
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#include "secblock.h" |
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NAMESPACE_BEGIN(CryptoPP) |
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//! _ |
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template <class B = BigEndian> |
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struct SEAL_Info : public FixedKeyLength<20, SimpleKeyingInterface::INTERNALLY_GENERATED_IV, 4> |
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{ |
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static const char *StaticAlgorithmName() {return B::ToEnum() == LITTLE_ENDIAN_ORDER ? "SEAL-3.0-LE" : "SEAL-3.0-BE";} |
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}; |
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template <class B = BigEndian> |
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class CRYPTOPP_NO_VTABLE SEAL_Policy : public AdditiveCipherConcretePolicy<word32, 256>, public SEAL_Info<B> |
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{ |
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protected: |
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void CipherSetKey(const NameValuePairs ¶ms, const byte *key, size_t length); |
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void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount); |
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void CipherResynchronize(byte *keystreamBuffer, const byte *IV, size_t length); |
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bool CipherIsRandomAccess() const {return true;} |
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void SeekToIteration(lword iterationCount); |
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private: |
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FixedSizeSecBlock<word32, 512> m_T; |
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FixedSizeSecBlock<word32, 256> m_S; |
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SecBlock<word32> m_R; |
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word32 m_startCount, m_iterationsPerCount; |
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word32 m_outsideCounter, m_insideCounter; |
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}; |
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//! <a href="http://www.weidai.com/scan-mirror/cs.html#SEAL-3.0-BE">SEAL</a> |
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template <class B = BigEndian> |
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struct SEAL : public SEAL_Info<B>, public SymmetricCipherDocumentation |
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{ |
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typedef SymmetricCipherFinal<ConcretePolicyHolder<SEAL_Policy<B>, AdditiveCipherTemplate<> >, SEAL_Info<B> > Encryption; |
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typedef Encryption Decryption; |
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}; |
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NAMESPACE_END |
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#endif
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