Initial revision

git-svn-id: svn://svn.code.sf.net/p/cryptopp/code/trunk/c5@2 57ff6487-cd31-0410-9ec3-f628ee90f5f0

1 files changed, 47 insertions, 0 deletions

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+#ifndef CRYPTOPP_SEAL_H
+#define CRYPTOPP_SEAL_H
+
+#include "strciphr.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+template <class B = BigEndian>
+struct SEAL_Info : public FixedKeyLength<20, SimpleKeyingInterface::INTERNALLY_GENERATED_IV>
+{
+	static const char *StaticAlgorithmName() {return B::ToEnum() == LITTLE_ENDIAN_ORDER ? "SEAL-3.0-LE" : "SEAL-3.0-BE";}
+};
+
+template <class B = BigEndian>
+class SEAL_Policy : public AdditiveCipherConcretePolicy<word32, 1024>, public SEAL_Info<B>
+{
+public:
+	unsigned int IVSize() const {return 4;}
+	void GetNextIV(byte *IV) const {UnalignedPutWord(BIG_ENDIAN_ORDER, IV, m_outsideCounter+1);}
+
+protected:
+	void CipherSetKey(const NameValuePairs &params, const byte *key, unsigned int length);
+	void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, unsigned int iterationCount);
+	void CipherResynchronize(byte *keystreamBuffer, const byte *IV);
+	bool IsRandomAccess() const {return true;}
+	void SeekToIteration(dword iterationCount);
+
+private:
+	FixedSizeSecBlock<word32, 512> m_T;
+	FixedSizeSecBlock<word32, 256> m_S;
+	SecBlock<word32> m_R;
+
+	word32 m_startCount, m_iterationsPerCount;
+	word32 m_outsideCounter, m_insideCounter;
+};
+
+//! <a href="http://www.weidai.com/scan-mirror/cs.html#SEAL-3.0-BE">SEAL</a>
+template <class B = BigEndian>
+struct SEAL : public SEAL_Info<B>, public SymmetricCipherDocumentation
+{
+	typedef SymmetricCipherFinalTemplate<ConcretePolicyHolder<SEAL_Policy<B>, AdditiveCipherTemplate<> >, SEAL_Info<B> > Encryption;
+	typedef Encryption Decryption;
+};
+
+NAMESPACE_END
+
+#endif