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cast.h

Go to the documentation of this file.

#ifndef CRYPTOPP_CAST_H
#define CRYPTOPP_CAST_H

#include "cryptlib.h"
#include "misc.h"

NAMESPACE_BEGIN(CryptoPP)

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

class CAST128 : public FixedBlockSize<8>, public CAST, public VariableKeyLength<16, 5, 16>
{
protected:
        // keylength should be between 5 and 16
        CAST128(const byte *userKey, unsigned int keylength);

        bool reduced;
        SecBlock<word32> K;
};

class CAST128Encryption : public CAST128
{
public:
        CAST128Encryption(const byte *userKey, unsigned int keylength=DEFAULT_KEYLENGTH)
                : CAST128(userKey, keylength) {}

        void ProcessBlock(const byte *inBlock, byte * outBlock) const;
        void ProcessBlock(byte * inoutBlock) const
                {CAST128Encryption::ProcessBlock(inoutBlock, inoutBlock);}
};

class CAST128Decryption : public CAST128
{
public:
        CAST128Decryption(const byte *userKey, unsigned int keylength=DEFAULT_KEYLENGTH)
                : CAST128(userKey, keylength) {}

        void ProcessBlock(const byte *inBlock, byte * outBlock) const;
        void ProcessBlock(byte * inoutBlock) const
                {CAST128Decryption::ProcessBlock(inoutBlock, inoutBlock);}
};

class CAST256 : public FixedBlockSize<16>, public CAST, public VariableKeyLength<16, 16, 32>
{
public:
        void ProcessBlock(const byte *inBlock, byte * outBlock) const;
        void ProcessBlock(byte * inoutBlock) const
                {CAST256::ProcessBlock(inoutBlock, inoutBlock);}

protected:
        CAST256(const byte *userKey, unsigned int keylength);

        SecBlock<word32> K;

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

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

class CAST256Encryption : public CAST256
{
public:
        CAST256Encryption(const byte *userKey, unsigned int keylength=DEFAULT_KEYLENGTH)
                : CAST256(userKey, keylength) {}
};

class CAST256Decryption : public CAST256
{
public:
        CAST256Decryption(const byte *userKey, unsigned int keylength=DEFAULT_KEYLENGTH);
};

NAMESPACE_END

#endif

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