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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 ¶ms, 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);
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
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