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// tea.h - originally written and placed in the public domain by Wei Dai
/// \file tea.h
/// \brief Classes for the TEA, BTEA and XTEA block ciphers
#ifndef CRYPTOPP_TEA_H
#define CRYPTOPP_TEA_H
#include "seckey.h"
#include "secblock.h"
#include "misc.h"
NAMESPACE_BEGIN(CryptoPP)
/// \brief TEA block cipher information
struct TEA_Info : public FixedBlockSize<8>, public FixedKeyLength<16>, public VariableRounds<32>
{
/// \brief The algorithm name
/// \return the algorithm name
/// \details StaticAlgorithmName returns the algorithm's name as a static
/// member function.
CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "TEA";}
};
/// \brief TEA block cipher
/// \sa <a href="http://www.cryptopp.com/wiki/TEA">TEA</a>
class TEA : public TEA_Info, public BlockCipherDocumentation
{
/// \brief TEA block cipher default operation
class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<TEA_Info>
{
public:
void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs ¶ms);
protected:
FixedSizeSecBlock<word32, 4> m_k;
word32 m_limit;
};
/// \brief TEA block cipher encryption operation
class CRYPTOPP_NO_VTABLE Enc : public Base
{
public:
void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
};
/// \brief TEA block cipher decryption operation
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;
/// \brief XTEA block cipher information
struct XTEA_Info : public FixedBlockSize<8>, public FixedKeyLength<16>, public VariableRounds<32>
{
/// \brief The algorithm name
/// \return the algorithm name
/// \details StaticAlgorithmName returns the algorithm's name as a static
/// member function.
CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "XTEA";}
};
/// \brief XTEA block cipher
/// \sa <a href="http://www.cryptopp.com/wiki/TEA">XTEA</a>
class XTEA : public XTEA_Info, public BlockCipherDocumentation
{
/// \brief XTEA block cipher default operation
class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<XTEA_Info>
{
public:
void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs ¶ms);
protected:
FixedSizeSecBlock<word32, 4> m_k;
word32 m_limit;
};
/// \brief XTEA block cipher encryption operation
class CRYPTOPP_NO_VTABLE Enc : public Base
{
public:
void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
};
/// \brief XTEA block cipher decryption operation
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;
};
/// \brief BTEA block cipher information
struct BTEA_Info : public FixedKeyLength<16>
{
/// \brief The algorithm name
/// \return the algorithm name
/// \details StaticAlgorithmName returns the algorithm's name as a static
/// member function.
CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "BTEA";}
};
/// \brief BTEA block cipher
/// \details Corrected Block TEA as described in "xxtea". This class hasn't been tested yet.
/// \sa <A HREF="http://www.movable-type.co.uk/scripts/xxtea.pdf">Correction to xtea</A> and
/// <a href="http://www.cryptopp.com/wiki/TEA">Corrected Block TEA</a>.
class BTEA : public BTEA_Info, public BlockCipherDocumentation
{
/// \brief BTEA block cipher default operation
class CRYPTOPP_NO_VTABLE Base : public AlgorithmImpl<SimpleKeyingInterfaceImpl<BlockCipher, BTEA_Info>, BTEA_Info>
{
public:
void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs ¶ms)
{
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;
};
/// \brief BTEA block cipher encryption operation
class CRYPTOPP_NO_VTABLE Enc : public Base
{
public:
void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
};
/// \brief BTEA block cipher decryption operation
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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