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externals/cryptopp/seal.h

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+// seal.h - originally written and placed in the public domain by Wei Dai
+
+/// \file seal.h
+/// \brief Classes for SEAL stream cipher
+/// \since Crypto++ 2.2
+
+#ifndef CRYPTOPP_SEAL_H
+#define CRYPTOPP_SEAL_H
+
+#include "strciphr.h"
+#include "secblock.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+/// \brief SEAL stream cipher information
+/// \tparam B Endianness of the stream cipher
+/// \since Crypto++ 2.2
+template <class B = BigEndian>
+struct SEAL_Info : public FixedKeyLength<20, SimpleKeyingInterface::INTERNALLY_GENERATED_IV, 4>
+{
+	CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return B::ToEnum() == LITTLE_ENDIAN_ORDER ? "SEAL-3.0-LE" : "SEAL-3.0-BE";}
+};
+
+/// \brief SEAL stream cipher operation
+/// \tparam B Endianness of the stream cipher
+/// \since Crypto++ 2.2
+template <class B = BigEndian>
+class CRYPTOPP_NO_VTABLE SEAL_Policy : public AdditiveCipherConcretePolicy<word32, 256>, public SEAL_Info<B>
+{
+protected:
+	void CipherSetKey(const NameValuePairs &params, const byte *key, size_t length);
+	void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount);
+	void CipherResynchronize(byte *keystreamBuffer, const byte *IV, size_t length);
+	bool CipherIsRandomAccess() const {return true;}
+	void SeekToIteration(lword 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;
+};
+
+/// \brief SEAL stream cipher
+/// \tparam B Endianness of the stream cipher
+/// \sa <a href="http://www.cryptopp.com/wiki/SEAL-3.0-BE">SEAL</a>
+/// \since Crypto++ 2.2
+template <class B = BigEndian>
+struct SEAL : public SEAL_Info<B>, public SymmetricCipherDocumentation
+{
+	typedef SymmetricCipherFinal<ConcretePolicyHolder<SEAL_Policy<B>, AdditiveCipherTemplate<> >, SEAL_Info<B> > Encryption;
+	typedef Encryption Decryption;
+};
+
+NAMESPACE_END
+
+#endif