tea.h
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// tea.h - 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)
//! \class TEA_Info
//! \brief TEA block cipher information
struct TEA_Info : public FixedBlockSize<8>, public FixedKeyLength<16>, public VariableRounds<32>
{
CRYPTOPP_CONSTEXPR static const char *StaticAlgorithmName() {return "TEA";}
};
//! \class TEA
//! \brief TEA block cipher
//! \sa <a href="http://www.weidai.com/scan-mirror/cs.html#TEA">TEA</a>
class TEA : public TEA_Info, public BlockCipherDocumentation
{
//! \class Base
//! \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 &params);
protected:
FixedSizeSecBlock<word32, 4> m_k;
word32 m_limit;
};
//! \class Enc
//! \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;
};
//! \class Dec
//! \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;
//! \class XTEA_Info
//! \brief XTEA block cipher information
struct XTEA_Info : public FixedBlockSize<8>, public FixedKeyLength<16>, public VariableRounds<32>
{
CRYPTOPP_CONSTEXPR static const char *StaticAlgorithmName() {return "XTEA";}
};
//! \class XTEA
//! \brief XTEA block cipher
//! \sa <a href="http://www.weidai.com/scan-mirror/cs.html#TEA">XTEA</a>
class XTEA : public XTEA_Info, public BlockCipherDocumentation
{
//! \class Base
//! \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 &params);
protected:
FixedSizeSecBlock<word32, 4> m_k;
word32 m_limit;
};
//! \class Enc
//! \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;
};
//! \class Dec
//! \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;
};
//! \class BTEA_Info
//! \brief BTEA block cipher information
struct BTEA_Info : public FixedKeyLength<16>
{
CRYPTOPP_CONSTEXPR static const char *StaticAlgorithmName() {return "BTEA";}
};
//! \class 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.weidai.com/scan-mirror/cs.html#TEA">Corrected Block TEA</a>.
class BTEA : public BTEA_Info, public BlockCipherDocumentation
{
//! \class Base
//! \brief BTEA block cipher default operation
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 Enc
//! \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;
};
//! \class Dec
//! \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
NameValuePairs::GetIntValueWithDefault
int GetIntValueWithDefault(const char *name, int defaultValue) const
Get a named value with type int, with default.
Definition: cryptlib.h:380
FixedKeyLength
Inherited by keyed algorithms with fixed key length.
Definition: seckey.h:128
misc.h
Utility functions for the Crypto++ library.
BlockCipherDocumentation
Provides Encryption and Decryption typedefs used by derived classes to implement a block cipher...
Definition: seckey.h:423
FixedKeyLength< 16 >::KEYLENGTH
static const int KEYLENGTH
The default key length used by the algorithm provided as a constant.
Definition: seckey.h:133
BlockCipher
Interface for one direction (encryption or decryption) of a block cipher.
Definition: cryptlib.h:1091
secblock.h
Classes and functions for secure memory allocations.
BTEA
BTEA block cipher.
Definition: tea.h:119
FixedBlockSize
Inherited by algorithms with fixed block size.
Definition: seckey.h:34
VariableRounds
Inherited by algorithms with variable number of rounds.
Definition: seckey.h:60
seckey.h
Classes and functions for implementing secret key algorithms.
XTEA_Info
XTEA block cipher information.
Definition: tea.h:65
BlockCipherFinal< ENCRYPTION, Enc >
XTEA
XTEA block cipher.
Definition: tea.h:73
TEA_Info
TEA block cipher information.
Definition: tea.h:17
FixedSizeSecBlock< word32, 4 >
TEA
TEA block cipher.
Definition: tea.h:25
BIG_ENDIAN_ORDER
byte order is big-endian
Definition: cryptlib.h:127
Name::BlockSize
const char * BlockSize()
int, in bytes
Definition: argnames.h:26
BlockCipherImpl
Provides a base implementation of Algorithm and SimpleKeyingInterface for block ciphers.
Definition: seckey.h:326
BTEA_Info
BTEA block cipher information.
Definition: tea.h:110
CryptoPP
Crypto++ library namespace.
NameValuePairs
Interface for retrieving values given their names.
Definition: cryptlib.h:277
AlgorithmImpl
Base class for identifying alogorithm.
Definition: simple.h:38