twofish.h

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// twofish.h - originally written and placed in the public domain by Wei Dai
 
/// \file twofish.h
/// \brief Classes for the Twofish block cipher
 
#ifndef CRYPTOPP_TWOFISH_H
#define CRYPTOPP_TWOFISH_H
 
#include "seckey.h"
#include "secblock.h"
 
NAMESPACE_BEGIN(CryptoPP)
 
/// \brief Twofish block cipher information
/// \since Crypto++ 3.1
struct Twofish_Info : public FixedBlockSize<16>, public VariableKeyLength<16, 16, 32, 8>, FixedRounds<16>
{
    CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "Twofish";}
};
 
/// \brief Twofish block cipher
/// \sa <a href="http://www.cryptopp.com/wiki/Twofish">Twofish</a>
/// \since Crypto++ 3.1
class Twofish : public Twofish_Info, public BlockCipherDocumentation
{
    class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<Twofish_Info>
    {
    public:
        void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);
 
    protected:
        static word32 h0(word32 x, const word32 *key, unsigned int kLen);
        static word32 h(word32 x, const word32 *key, unsigned int kLen);
 
        static const byte q[2][256];
        static const word32 mds[4][256];
 
        FixedSizeSecBlock<word32, 40> m_k;
        FixedSizeSecBlock<word32, 4*256> m_s;
    };
 
    class CRYPTOPP_NO_VTABLE Enc : public Base
    {
    public:
        void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
    };
 
    class CRYPTOPP_NO_VTABLE Dec : public Base
    {
    public:
        void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
    };
 
public:
    typedef BlockCipherFinal<ENCRYPTION, Enc> Encryption;
    typedef BlockCipherFinal<DECRYPTION, Dec> Decryption;
};
 
typedef Twofish::Encryption TwofishEncryption;
typedef Twofish::Decryption TwofishDecryption;
 
NAMESPACE_END
 
#endif