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seal.h

00001 #ifndef CRYPTOPP_SEAL_H
00002 #define CRYPTOPP_SEAL_H
00003 
00004 #include "strciphr.h"
00005 
00006 NAMESPACE_BEGIN(CryptoPP)
00007 
00008 template <class B = BigEndian>
00009 struct SEAL_Info : public FixedKeyLength<20, SimpleKeyingInterface::INTERNALLY_GENERATED_IV>
00010 {
00011         static const char *StaticAlgorithmName() {return B::ToEnum() == LITTLE_ENDIAN_ORDER ? "SEAL-3.0-LE" : "SEAL-3.0-BE";}
00012 };
00013 
00014 template <class B = BigEndian>
00015 class SEAL_Policy : public AdditiveCipherConcretePolicy<word32, 1024>, public SEAL_Info<B>
00016 {
00017 public:
00018         unsigned int IVSize() const {return 4;}
00019         void GetNextIV(byte *IV) const {UnalignedPutWord(BIG_ENDIAN_ORDER, IV, m_outsideCounter+1);}
00020 
00021 protected:
00022         void CipherSetKey(const NameValuePairs &params, const byte *key, unsigned int length);
00023         void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, unsigned int iterationCount);
00024         void CipherResynchronize(byte *keystreamBuffer, const byte *IV);
00025         bool IsRandomAccess() const {return true;}
00026         void SeekToIteration(dword iterationCount);
00027 
00028 private:
00029         FixedSizeSecBlock<word32, 512> m_T;
00030         FixedSizeSecBlock<word32, 256> m_S;
00031         SecBlock<word32> m_R;
00032 
00033         word32 m_startCount, m_iterationsPerCount;
00034         word32 m_outsideCounter, m_insideCounter;
00035 };
00036 
00037 //! <a href="http://www.weidai.com/scan-mirror/cs.html#SEAL-3.0-BE">SEAL</a>
00038 template <class B = BigEndian>
00039 struct SEAL : public SEAL_Info<B>, public SymmetricCipherDocumentation
00040 {
00041         typedef SymmetricCipherFinalTemplate<ConcretePolicyHolder<SEAL_Policy<B>, AdditiveCipherTemplate<> >, SEAL_Info<B> > Encryption;
00042         typedef Encryption Decryption;
00043 };
00044 
00045 NAMESPACE_END
00046 
00047 #endif

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