68 lines
2.4 KiB
C++
68 lines
2.4 KiB
C++
// hc128.h - written and placed in the public domain by Jeffrey Walton
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// based on public domain code by Hongjun Wu.
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//
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// The reference materials and source files are available at
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// The eSTREAM Project, http://www.ecrypt.eu.org/stream/e2-hc128.html.
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/// \file hc128.h
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/// \brief Classes for HC-128 stream cipher
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/// \sa <A HREF="http://www.ecrypt.eu.org/stream/e2-hc128.html">The
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/// eSTREAM Project | HC-128</A> and
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/// <A HREF="https://www.cryptopp.com/wiki/HC-128">Crypto++ Wiki | HC-128</A>.
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/// \since Crypto++ 8.0
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#ifndef CRYPTOPP_HC128_H
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#define CRYPTOPP_HC128_H
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#include "strciphr.h"
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#include "secblock.h"
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NAMESPACE_BEGIN(CryptoPP)
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/// \brief HC-128 stream cipher information
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/// \since Crypto++ 8.0
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struct HC128Info : public FixedKeyLength<16, SimpleKeyingInterface::UNIQUE_IV, 16>
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{
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CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() { return "HC-128"; }
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};
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/// \brief HC-128 stream cipher implementation
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/// \since Crypto++ 8.0
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class HC128Policy : public AdditiveCipherConcretePolicy<word32, 16>, public HC128Info
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{
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protected:
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void CipherSetKey(const NameValuePairs ¶ms, const byte *key, size_t length);
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void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount);
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void CipherResynchronize(byte *keystreamBuffer, const byte *iv, size_t length);
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bool CanOperateKeystream() const { return true; }
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bool CipherIsRandomAccess() const { return false; }
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void GenerateKeystream(word32* keystream);
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void SetupUpdate();
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private:
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FixedSizeSecBlock<word32, 16> m_X;
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FixedSizeSecBlock<word32, 16> m_Y;
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FixedSizeSecBlock<word32, 8> m_key;
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FixedSizeSecBlock<word32, 8> m_iv;
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word32 m_T[1024];
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word32 m_ctr;
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};
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/// \brief HC-128 stream cipher
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/// \details HC-128 is a stream cipher developed by Hongjun Wu. HC-128 is one of the
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/// final four Profile 1 (software) ciphers selected for the eSTREAM portfolio.
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/// \sa <A HREF="http://www.ecrypt.eu.org/stream/e2-hc128.html">The
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/// eSTREAM Project | HC-128</A> and
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/// <A HREF="https://www.cryptopp.com/wiki/HC-128">Crypto++ Wiki | HC-128</A>.
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/// \since Crypto++ 8.0
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struct HC128 : public HC128Info, public SymmetricCipherDocumentation
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{
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typedef SymmetricCipherFinal<ConcretePolicyHolder<HC128Policy, AdditiveCipherTemplate<> >, HC128Info> Encryption;
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typedef Encryption Decryption;
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};
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NAMESPACE_END
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#endif // CRYPTOPP_HC128_H
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