tea.h

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#ifndef CRYPTOPP_TEA_H
#define CRYPTOPP_TEA_H

/** \file
*/

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

NAMESPACE_BEGIN(CryptoPP)

//! _
struct TEA_Info : public FixedBlockSize<8>, public FixedKeyLength<16>, public VariableRounds<32>
{
        static const char *StaticAlgorithmName() {return "TEA";}
};

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

        protected:
                FixedSizeSecBlock<word32, 4> m_k;
                word32 m_limit;
        };

        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 TEA::Encryption TEAEncryption;
typedef TEA::Decryption TEADecryption;

//! _
struct XTEA_Info : public FixedBlockSize<8>, public FixedKeyLength<16>, public VariableRounds<32>
{
        static const char *StaticAlgorithmName() {return "XTEA";}
};

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

        protected:
                FixedSizeSecBlock<word32, 4> m_k;
                word32 m_limit;
        };

        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;
};

//! _
struct BTEA_Info : public FixedKeyLength<16>
{
        static const char *StaticAlgorithmName() {return "BTEA";}
};

//! <a href="http://www.weidai.com/scan-mirror/cs.html#TEA">corrected Block TEA</a> (as described in "xxtea").
/*! This class hasn't been tested yet. */
class BTEA : public BTEA_Info, public BlockCipherDocumentation
{
        class CRYPTOPP_NO_VTABLE Base : public AlgorithmImpl<SimpleKeyingInterfaceImpl<BlockCipher, BTEA_Info>, BTEA_Info>, public BTEA_Info
        {
        public:
                template <class T>
                static inline void CheckedSetKey(T *obj, CipherDir dir, const byte *key, unsigned int length, const NameValuePairs &param)
                {
                        obj->ThrowIfInvalidKeyLength(length);
                        obj->m_blockSize = param.GetIntValueWithDefault("BlockSize", 60*4);
                        GetUserKey(BIG_ENDIAN_ORDER, obj->m_k.begin(), 4, key, KEYLENGTH);
                }

                unsigned int BlockSize() const {return m_blockSize;}

        protected:
                FixedSizeSecBlock<word32, 4> m_k;
                unsigned int m_blockSize;
        };

        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;
};

NAMESPACE_END

#endif

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