1#ifndef CRYPTOPP_SEAL_H 2#define CRYPTOPP_SEAL_H 3 4#include "strciphr.h" 5 6NAMESPACE_BEGIN(CryptoPP) 7 8//! _ 9template <class B = BigEndian> 10struct SEAL_Info : public FixedKeyLength<20, SimpleKeyingInterface::INTERNALLY_GENERATED_IV, 4> 11{ 12 static const char *StaticAlgorithmName() {return B::ToEnum() == LITTLE_ENDIAN_ORDER ? "SEAL-3.0-LE" : "SEAL-3.0-BE";} 13}; 14 15template <class B = BigEndian> 16class CRYPTOPP_NO_VTABLE SEAL_Policy : public AdditiveCipherConcretePolicy<word32, 256>, public SEAL_Info<B> 17{ 18protected: 19 void CipherSetKey(const NameValuePairs ¶ms, const byte *key, size_t length); 20 void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount); 21 void CipherResynchronize(byte *keystreamBuffer, const byte *IV, size_t length); 22 bool CipherIsRandomAccess() const {return true;} 23 void SeekToIteration(lword iterationCount); 24 25private: 26 FixedSizeSecBlock<word32, 512> m_T; 27 FixedSizeSecBlock<word32, 256> m_S; 28 SecBlock<word32> m_R; 29 30 word32 m_startCount, m_iterationsPerCount; 31 word32 m_outsideCounter, m_insideCounter; 32}; 33 34//! <a href="http://www.weidai.com/scan-mirror/cs.html#SEAL-3.0-BE">SEAL</a> 35template <class B = BigEndian> 36struct SEAL : public SEAL_Info<B>, public SymmetricCipherDocumentation 37{ 38 typedef SymmetricCipherFinal<ConcretePolicyHolder<SEAL_Policy<B>, AdditiveCipherTemplate<> >, SEAL_Info<B> > Encryption; 39 typedef Encryption Decryption; 40}; 41 42NAMESPACE_END 43 44#endif 45