twofish.h

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// twofish.h - written and placed in the public domain by Wei Dai


#ifndef CRYPTOPP_TWOFISH_H
#define CRYPTOPP_TWOFISH_H

#include "seckey.h"
#include "secblock.h"

NAMESPACE_BEGIN(CryptoPP)

struct Twofish_Info : public FixedBlockSize<16>, public VariableKeyLength<16, 16, 32, 8>, FixedRounds<16>
{
        CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "Twofish";}
};

//~ \sa <a href="http://www.weidai.com/scan-mirror/cs.html#Twofish">Twofish</a>
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