hc128.h

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// hc128.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/e2-hc128.html.
 
 
#ifndef CRYPTOPP_HC128_H
#define CRYPTOPP_HC128_H
 
#include "strciphr.h"
#include "secblock.h"
 
NAMESPACE_BEGIN(CryptoPP)
 
 
struct HC128Info : public FixedKeyLength<16, SimpleKeyingInterface::UNIQUE_IV, 16>
{
        CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() { return "HC-128"; }
};
 
class HC128Policy : public AdditiveCipherConcretePolicy<word32, 16>, public HC128Info
{
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; }
 
        void GenerateKeystream(word32* keystream);
        void SetupUpdate();
 
private:
        FixedSizeSecBlock<word32, 16> m_X;
        FixedSizeSecBlock<word32, 16> m_Y;
        FixedSizeSecBlock<word32, 8> m_key;
        FixedSizeSecBlock<word32, 8> m_iv;
        word32 m_T[1024];
        word32 m_ctr;
};
 
struct HC128 : public HC128Info, public SymmetricCipherDocumentation
{
        typedef SymmetricCipherFinal<ConcretePolicyHolder<HC128Policy, AdditiveCipherTemplate<> >, HC128Info> Encryption;
        typedef Encryption Decryption;
};
 
NAMESPACE_END
 
#endif  // CRYPTOPP_HC128_H