113 lines
4.8 KiB
C++
113 lines
4.8 KiB
C++
// rabbit.h - written and placed in the public domain by Jeffrey Walton
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// based on public domain code by Martin Boesgaard, Mette Vesterager,
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// Thomas Pedersen, Jesper Christiansen and Ove Scavenius.
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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-rabbit.html.
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/// \file rabbit.h
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/// \brief Classes for Rabbit stream cipher
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/// \sa <A HREF="http://www.ecrypt.eu.org/stream/e2-rabbit.html">The
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/// eSTREAM Project | Rabbit</A> and
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/// <A HREF="https://www.cryptopp.com/wiki/Rabbit">Crypto++ Wiki | Rabbit</A>.
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/// \since Crypto++ 8.0
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#ifndef CRYPTOPP_RABBIT_H
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#define CRYPTOPP_RABBIT_H
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#include "strciphr.h"
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#include "secblock.h"
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// The library does not have a way to describe an optional IV. Rabbit takes
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// an optional IV so two classes are offered to bridge the gap. One provides
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// Rabbit without an IV and the second provides Rabbit with an IV.
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NAMESPACE_BEGIN(CryptoPP)
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/// \brief Rabbit stream cipher information
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/// \since Crypto++ 8.0
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struct RabbitInfo : public FixedKeyLength<16, SimpleKeyingInterface::NOT_RESYNCHRONIZABLE>
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{
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CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() { return "Rabbit"; }
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};
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/// \brief Rabbit stream cipher information
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/// \since Crypto++ 8.0
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struct RabbitWithIVInfo : public FixedKeyLength<16, SimpleKeyingInterface::UNIQUE_IV, 8>
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{
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CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() { return "RabbitWithIV"; }
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};
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/// \brief Rabbit stream cipher implementation
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/// \since Crypto++ 8.0
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class RabbitPolicy : public AdditiveCipherConcretePolicy<word32, 4>, public RabbitInfo
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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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bool CanOperateKeystream() const { return true; }
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bool CipherIsRandomAccess() const { return false; }
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private:
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// Master and working states
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FixedSizeSecBlock<word32, 8> m_mx, m_mc, m_wx, m_wc;
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// Workspace
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FixedSizeSecBlock<word32, 12> m_t;
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word32 m_mcy, m_wcy; // carry
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};
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/// \brief Rabbit stream cipher implementation
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/// \since Crypto++ 8.0
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class RabbitWithIVPolicy : public AdditiveCipherConcretePolicy<word32, 4>, public RabbitWithIVInfo
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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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private:
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// Master and working states
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FixedSizeSecBlock<word32, 8> m_mx, m_mc, m_wx, m_wc;
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// Workspace
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FixedSizeSecBlock<word32, 12> m_t;
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word32 m_mcy, m_wcy; // carry
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};
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/// \brief Rabbit stream cipher
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/// \details Rabbit is a stream cipher developed by Martin Boesgaard, Mette Vesterager,
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/// Thomas Pedersen, Jesper Christiansen and Ove Scavenius. Rabbit is one of the final four
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/// Profile 1 (software) ciphers selected for the eSTREAM portfolio.
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/// \details Crypto++ provides Rabbit and RabbitWithIV classes. Two classes are necessary
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/// because the library lacks the means to describe and manage optional IVs.
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/// \sa RabbitWithIV, <A HREF="http://www.ecrypt.eu.org/stream/e2-rabbit.html">The
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/// eSTREAM Project | Rabbit</A> and
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/// <A HREF="https://www.cryptopp.com/wiki/Rabbit">Crypto++ Wiki | Rabbit</A>.
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/// \since Crypto++ 8.0
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struct Rabbit : public RabbitInfo, public SymmetricCipherDocumentation
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{
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typedef SymmetricCipherFinal<ConcretePolicyHolder<RabbitPolicy, AdditiveCipherTemplate<> >, RabbitInfo> Encryption;
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typedef Encryption Decryption;
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};
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/// \brief Rabbit stream cipher
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/// \details Rabbit is a stream cipher developed by Martin Boesgaard, Mette Vesterager,
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/// Thomas Pedersen, Jesper Christiansen and Ove Scavenius. Rabbit is one of the final four
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/// Profile 1 (software) ciphers selected for the eSTREAM portfolio.
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/// \details Crypto++ provides Rabbit and RabbitWithIV classes. Two classes are necessary
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/// because the library lacks the means to describe and manage optional IVs.
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/// \sa Rabbit, <A HREF="http://www.ecrypt.eu.org/stream/e2-rabbit.html">The
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/// eSTREAM Project | Rabbit</A> and
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/// <A HREF="https://www.cryptopp.com/wiki/Rabbit">Crypto++ Wiki | Rabbit</A>.
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/// \since Crypto++ 8.0
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struct RabbitWithIV : public RabbitWithIVInfo, public SymmetricCipherDocumentation
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{
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typedef SymmetricCipherFinal<ConcretePolicyHolder<RabbitWithIVPolicy, AdditiveCipherTemplate<> >, RabbitWithIVInfo> Encryption;
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typedef Encryption Decryption;
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};
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NAMESPACE_END
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#endif // CRYPTOPP_RABBIT_H
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