Crypto++
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00001 #ifndef CRYPTOPP_SEAL_H 00002 #define CRYPTOPP_SEAL_H 00003 00004 #include "strciphr.h" 00005 00006 NAMESPACE_BEGIN(CryptoPP) 00007 00008 //! _ 00009 template <class B = BigEndian> 00010 struct SEAL_Info : public FixedKeyLength<20, SimpleKeyingInterface::INTERNALLY_GENERATED_IV, 4> 00011 { 00012 static const char *StaticAlgorithmName() {return B::ToEnum() == LITTLE_ENDIAN_ORDER ? "SEAL-3.0-LE" : "SEAL-3.0-BE";} 00013 }; 00014 00015 template <class B = BigEndian> 00016 class CRYPTOPP_NO_VTABLE SEAL_Policy : public AdditiveCipherConcretePolicy<word32, 256>, public SEAL_Info<B> 00017 { 00018 protected: 00019 void CipherSetKey(const NameValuePairs ¶ms, const byte *key, size_t length); 00020 void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount); 00021 void CipherResynchronize(byte *keystreamBuffer, const byte *IV, size_t length); 00022 bool CipherIsRandomAccess() const {return true;} 00023 void SeekToIteration(lword iterationCount); 00024 00025 private: 00026 FixedSizeSecBlock<word32, 512> m_T; 00027 FixedSizeSecBlock<word32, 256> m_S; 00028 SecBlock<word32> m_R; 00029 00030 word32 m_startCount, m_iterationsPerCount; 00031 word32 m_outsideCounter, m_insideCounter; 00032 }; 00033 00034 //! <a href="http://www.weidai.com/scan-mirror/cs.html#SEAL-3.0-BE">SEAL</a> 00035 template <class B = BigEndian> 00036 struct SEAL : public SEAL_Info<B>, public SymmetricCipherDocumentation 00037 { 00038 typedef SymmetricCipherFinal<ConcretePolicyHolder<SEAL_Policy<B>, AdditiveCipherTemplate<> >, SEAL_Info<B> > Encryption; 00039 typedef Encryption Decryption; 00040 }; 00041 00042 NAMESPACE_END 00043 00044 #endif