1 // hc128.h - written and placed in the public domain by Jeffrey Walton 2 // based on public domain code by Hongjun Wu. 3 // 4 // The reference materials and source files are available at 5 // The eSTREAM Project, http://www.ecrypt.eu.org/stream/e2-hc128.html. 6 7 /// \file hc128.h 8 /// \brief Classes for HC-128 stream cipher 9 /// \sa <A HREF="http://www.ecrypt.eu.org/stream/e2-hc128.html">The 10 /// eSTREAM Project | HC-128</A> and 11 /// <A HREF="https://www.cryptopp.com/wiki/HC-128">Crypto++ Wiki | HC-128</A>. 12 /// \since Crypto++ 8.0 13 14 #ifndef CRYPTOPP_HC128_H 15 #define CRYPTOPP_HC128_H 16 17 #include "strciphr.h" 18 #include "secblock.h" 19 20 NAMESPACE_BEGIN(CryptoPP) 21 22 /// \brief HC-128 stream cipher information 23 /// \since Crypto++ 8.0 24 struct HC128Info : public FixedKeyLength<16, SimpleKeyingInterface::UNIQUE_IV, 16> 25 { 26 CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() { return "HC-128"; } 27 }; 28 29 /// \brief HC-128 stream cipher implementation 30 /// \since Crypto++ 8.0 31 class HC128Policy : public AdditiveCipherConcretePolicy<word32, 16>, public HC128Info 32 { 33 protected: 34 void CipherSetKey(const NameValuePairs ¶ms, const byte *key, size_t length); 35 void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount); 36 void CipherResynchronize(byte *keystreamBuffer, const byte *iv, size_t length); 37 bool CanOperateKeystream() const { return true; } 38 bool CipherIsRandomAccess() const { return false; } 39 40 void GenerateKeystream(word32* keystream); 41 void SetupUpdate(); 42 43 private: 44 FixedSizeSecBlock<word32, 16> m_X; 45 FixedSizeSecBlock<word32, 16> m_Y; 46 FixedSizeSecBlock<word32, 8> m_key; 47 FixedSizeSecBlock<word32, 8> m_iv; 48 word32 m_T[1024]; 49 word32 m_ctr; 50 }; 51 52 /// \brief HC-128 stream cipher 53 /// \details HC-128 is a stream cipher developed by Hongjun Wu. HC-128 is one of the 54 /// final four Profile 1 (software) ciphers selected for the eSTREAM portfolio. 55 /// \sa <A HREF="http://www.ecrypt.eu.org/stream/e2-hc128.html">The 56 /// eSTREAM Project | HC-128</A> and 57 /// <A HREF="https://www.cryptopp.com/wiki/HC-128">Crypto++ Wiki | HC-128</A>. 58 /// \since Crypto++ 8.0 59 struct HC128 : public HC128Info, public SymmetricCipherDocumentation 60 { 61 typedef SymmetricCipherFinal<ConcretePolicyHolder<HC128Policy, AdditiveCipherTemplate<> >, HC128Info> Encryption; 62 typedef Encryption Decryption; 63 }; 64 65 NAMESPACE_END 66 67 #endif // CRYPTOPP_HC128_H 68