safer.h

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


#ifndef CRYPTOPP_SAFER_H
#define CRYPTOPP_SAFER_H

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

NAMESPACE_BEGIN(CryptoPP)

class SAFER
{
public:
        class CRYPTOPP_NO_VTABLE Base : public BlockCipher
        {
        public:
                unsigned int OptimalDataAlignment() const {return 1;}
                void UncheckedSetKey(const byte *userkey, unsigned int length, const NameValuePairs &params);

        protected:
                virtual bool Strengthened() const =0;

                SecByteBlock keySchedule;
                static const byte exp_tab[256];
                static const byte log_tab[256];
        };

        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;
        };
};

template <class BASE, class INFO, bool STR>
class CRYPTOPP_NO_VTABLE SAFER_Impl : public BlockCipherImpl<INFO, BASE>
{
protected:
        bool Strengthened() const {return STR;}
};

struct SAFER_K_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 8, 16, 8>, public VariableRounds<10, 1, 13>
{
        CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "SAFER-K";}
};

class SAFER_K : public SAFER_K_Info, public SAFER, public BlockCipherDocumentation
{
public:
        typedef BlockCipherFinal<ENCRYPTION, SAFER_Impl<Enc, SAFER_K_Info, false> > Encryption;
        typedef BlockCipherFinal<DECRYPTION, SAFER_Impl<Dec, SAFER_K_Info, false> > Decryption;
};

struct SAFER_SK_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 8, 16, 8>, public VariableRounds<10, 1, 13>
{
        CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "SAFER-SK";}
};

class SAFER_SK : public SAFER_SK_Info, public SAFER, public BlockCipherDocumentation
{
public:
        typedef BlockCipherFinal<ENCRYPTION, SAFER_Impl<Enc, SAFER_SK_Info, true> > Encryption;
        typedef BlockCipherFinal<DECRYPTION, SAFER_Impl<Dec, SAFER_SK_Info, true> > Decryption;
};

typedef SAFER_K::Encryption SAFER_K_Encryption;
typedef SAFER_K::Decryption SAFER_K_Decryption;

typedef SAFER_SK::Encryption SAFER_SK_Encryption;
typedef SAFER_SK::Decryption SAFER_SK_Decryption;

NAMESPACE_END

#endif