tea.h

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


#ifndef CRYPTOPP_TEA_H
#define CRYPTOPP_TEA_H

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

NAMESPACE_BEGIN(CryptoPP)

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

class TEA : public TEA_Info, public BlockCipherDocumentation
{
        class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<TEA_Info>
        {
        public:
                void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);

        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>
{
        CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "XTEA";}
};

class XTEA : public XTEA_Info, public BlockCipherDocumentation
{
        class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<XTEA_Info>
        {
        public:
                void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);

        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>
{
        CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "BTEA";}
};

class BTEA : public BTEA_Info, public BlockCipherDocumentation
{
        class CRYPTOPP_NO_VTABLE Base : public AlgorithmImpl<SimpleKeyingInterfaceImpl<BlockCipher, BTEA_Info>, BTEA_Info>, public BTEA_Info
        {
        public:
                void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs &params)
                {
                        CRYPTOPP_UNUSED(length), CRYPTOPP_UNUSED(params);
                        m_blockSize = params.GetIntValueWithDefault("BlockSize", 60*4);
                        GetUserKey(BIG_ENDIAN_ORDER, 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