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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 //! _
    00009 template <class B = BigEndian>
    00010 struct SEAL_Info : public FixedKeyLength<20, SimpleKeyingInterface::INTERNALLY_GENERATED_IV>
    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 public:
    00019         unsigned int IVSize() const {return 4;}
    00020         void GetNextIV(byte *IV) const {UnalignedPutWord(BIG_ENDIAN_ORDER, IV, m_outsideCounter+1);}
    00021
    00022 protected:
    00023         void CipherSetKey(const NameValuePairs &params, const byte *key, size_t length);
    00024         void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount);
    00025         void CipherResynchronize(byte *keystreamBuffer, const byte *IV);
    00026         bool IsRandomAccess() const {return true;}
    00027         void SeekToIteration(lword iterationCount);
    00028
    00029 private:
    00030         FixedSizeSecBlock<word32, 512> m_T;
    00031         FixedSizeSecBlock<word32, 256> m_S;
    00032         SecBlock<word32> m_R;
    00033
    00034         word32 m_startCount, m_iterationsPerCount;
    00035         word32 m_outsideCounter, m_insideCounter;
    00036 };
    00037
    00038 //! <a href="http://www.weidai.com/scan-mirror/cs.html#SEAL-3.0-BE">SEAL</a>
    00039 template <class B = BigEndian>
    00040 struct SEAL : public SEAL_Info<B>, public SymmetricCipherDocumentation
    00041 {
    00042         typedef SymmetricCipherFinal<ConcretePolicyHolder<SEAL_Policy<B>, AdditiveCipherTemplate<> >, SEAL_Info<B> > Encryption;
    00043         typedef Encryption Decryption;
    00044 };
    00045
    00046 NAMESPACE_END
    00047
    00048 #endif