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externals/cryptopp/hc256.h

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+// hc256.h - written and placed in the public domain by Jeffrey Walton
+//           based on public domain code by Hongjun Wu.
+//
+//           The reference materials and source files are available at
+//           The eSTREAM Project, http://www.ecrypt.eu.org/stream/hc256.html.
+
+/// \file hc256.h
+/// \brief Classes for HC-256 stream cipher
+/// \sa <A HREF="http://www.ecrypt.eu.org/stream/hc256.html">The
+///   eSTREAM Project | HC-256</A> and
+///   <A HREF="https://www.cryptopp.com/wiki/HC-128">Crypto++ Wiki | HC-128</A>.
+/// \since Crypto++ 8.0
+
+#ifndef CRYPTOPP_HC256_H
+#define CRYPTOPP_HC256_H
+
+#include "strciphr.h"
+#include "secblock.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+/// \brief HC-256 stream cipher information
+/// \since Crypto++ 8.0
+struct HC256Info : public FixedKeyLength<32, SimpleKeyingInterface::UNIQUE_IV, 32>
+{
+	CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() { return "HC-256"; }
+};
+
+/// \brief HC-256 stream cipher implementation
+/// \since Crypto++ 8.0
+class HC256Policy : public AdditiveCipherConcretePolicy<word32, 4>, public HC256Info
+{
+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 CanOperateKeystream() const { return true; }
+	bool CipherIsRandomAccess() const { return false; }
+
+	word32 H1(word32 u);
+	word32 H2(word32 u);
+
+	void GenerateKeystream(word32* keystream);
+	word32 Generate();
+
+private:
+	FixedSizeSecBlock<word32, 8> m_key;
+	FixedSizeSecBlock<word32, 8> m_iv;
+	word32 m_P[1024];
+	word32 m_Q[1024];
+	word32 m_ctr;
+};
+
+/// \brief HC-256 stream cipher
+/// \details HC-256 is a stream cipher developed by Hongjun Wu. HC-256 is the
+///   successor to HC-128 from the eSTREAM project.
+/// \sa <A HREF="http://www.ecrypt.eu.org/stream/hc256.html">The
+///   eSTREAM Project | HC-256</A> and
+///   <A HREF="https://www.cryptopp.com/wiki/HC-128">Crypto++ Wiki | HC-128</A>.
+/// \since Crypto++ 8.0
+struct HC256 : public HC256Info, public SymmetricCipherDocumentation
+{
+	typedef SymmetricCipherFinal<ConcretePolicyHolder<HC256Policy, AdditiveCipherTemplate<> >, HC256Info> Encryption;
+	typedef Encryption Decryption;
+};
+
+NAMESPACE_END
+
+#endif  // CRYPTOPP_HC256_H