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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