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68 lines
2.3 KiB
C++
68 lines
2.3 KiB
C++
// hc256.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/hc256.html.
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/// \file hc256.h
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/// \brief Classes for HC-256 stream cipher
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/// \sa <A HREF="http://www.ecrypt.eu.org/stream/hc256.html">The
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/// eSTREAM Project | HC-256</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++ 7.1
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#ifndef CRYPTOPP_HC256_H
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#define CRYPTOPP_HC256_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-256 stream cipher information
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/// \since Crypto++ 7.1
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struct HC256Info : public FixedKeyLength<32, SimpleKeyingInterface::UNIQUE_IV, 32>
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{
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CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() { return "HC-256"; }
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};
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/// \brief HC-256 stream cipher implementation
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/// \since Crypto++ 7.1
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class HC256Policy : public AdditiveCipherConcretePolicy<word32, 4>, public HC256Info
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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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word32 H1(word32 u);
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word32 H2(word32 u);
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word32 Generate();
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private:
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FixedSizeSecBlock<word32, 8> m_key;
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FixedSizeSecBlock<word32, 8> m_iv;
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word32 m_P[1024];
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word32 m_Q[1024];
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word32 m_ctr;
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};
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/// \brief HC-256 stream cipher
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/// \details HC-256 is a stream cipher developed by Hongjun Wu. HC-256 is the
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/// successor to HC-128 from the eSTREAM project.
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/// \sa <A HREF="http://www.ecrypt.eu.org/stream/hc256.html">The
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/// eSTREAM Project | HC-256</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++ 7.1
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struct HC256 : public HC256Info, public SymmetricCipherDocumentation
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{
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typedef SymmetricCipherFinal<ConcretePolicyHolder<HC256Policy, AdditiveCipherTemplate<> >, HC256Info> Encryption;
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typedef Encryption Decryption;
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};
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NAMESPACE_END
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#endif // CRYPTOPP_HC256_H
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