cast.h

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#ifndef CRYPTOPP_CAST_H
#define CRYPTOPP_CAST_H

/** \file
*/

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

NAMESPACE_BEGIN(CryptoPP)

class CAST
{
protected:
        static const word32 S[8][256];
};

//! algorithm info
struct CAST128_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 5, 16>
{
        static const char *StaticAlgorithmName() {return "CAST-128";}
};

/// <a href="http://www.weidai.com/scan-mirror/cs.html#CAST-128">CAST-128</a>
class CAST128 : public CAST128_Info, public BlockCipherDocumentation
{
        class CRYPTOPP_NO_VTABLE Base : public CAST, public BlockCipherImpl<CAST128_Info>
        {
        public:
                void UncheckedSetKey(CipherDir direction, const byte *userKey, unsigned int length);

        protected:
                bool reduced;
                FixedSizeSecBlock<word32, 32> K;
        };

        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;
};

//! algorithm info
struct CAST256_Info : public FixedBlockSize<16>, public VariableKeyLength<16, 16, 32>
{
        static const char *StaticAlgorithmName() {return "CAST-256";}
};

//! <a href="http://www.weidai.com/scan-mirror/cs.html#CAST-256">CAST-256</a>
class CAST256 : public CAST256_Info, public BlockCipherDocumentation
{
        class CRYPTOPP_NO_VTABLE Base : public CAST, public BlockCipherImpl<CAST256_Info>
        {
        public:
                void UncheckedSetKey(CipherDir direction, const byte *userKey, unsigned int length = 8);
                void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;

        protected:
                static const word32 t_m[8][24];
                static const unsigned int t_r[8][24];

                static void Omega(int i, word32 kappa[8]);

                FixedSizeSecBlock<word32, 8*12> K;
        };

public:
        typedef BlockCipherFinal<ENCRYPTION, Base> Encryption;
        typedef BlockCipherFinal<DECRYPTION, Base> Decryption;
};

typedef CAST128::Encryption CAST128Encryption;
typedef CAST128::Decryption CAST128Decryption;

typedef CAST256::Encryption CAST256Encryption;
typedef CAST256::Decryption CAST256Decryption;

NAMESPACE_END

#endif

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