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// lea.h - written and placed in the public domain by Kim Sung Hee and Jeffrey Walton
// Based on "LEA: A 128-Bit Block Cipher for Fast Encryption on Common
// Processors" by Deukjo Hong, Jung-Keun Lee, Dong-Chan Kim, Daesung Kwon,
// Kwon Ho Ryu, and Dong-Geon Lee.
/// \file lea.h
/// \brief Classes for the LEA block cipher
/// \since Crypto++ 8.0
#ifndef CRYPTOPP_LEA_H
#define CRYPTOPP_LEA_H
#include "config.h"
#include "seckey.h"
#include "secblock.h"
#include "algparam.h"
#if (CRYPTOPP_BOOL_X64 || CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_ARM32 || CRYPTOPP_BOOL_ARMV8)
# ifndef CRYPTOPP_DISABLE_LEA_SIMD
# define CRYPTOPP_LEA_ADVANCED_PROCESS_BLOCKS 1
# endif
#endif
// Yet another SunStudio/SunCC workaround. Failed self tests
// in SSE code paths on i386 for SunStudio 12.3 and below.
#if defined(__SUNPRO_CC) && (__SUNPRO_CC <= 0x5120)
# undef CRYPTOPP_LEA_ADVANCED_PROCESS_BLOCKS
#endif
NAMESPACE_BEGIN(CryptoPP)
/// \brief LEA block cipher information
/// \since Crypto++ 8.0
struct LEA_Info : public FixedBlockSize<16>, public VariableKeyLength<16,16,32,8>
{
/// \brief The algorithm name
/// \return the algorithm name
/// \details StaticAlgorithmName returns the algorithm's name as a static
/// member function.
static const std::string StaticAlgorithmName()
{
// Format is Cipher-Blocksize
return "LEA-128";
}
};
/// \brief LEA 128-bit block cipher
/// \details LEA provides 128-bit block size. The valid key size is 128-bits, 192-bits and 256-bits.
/// \note Crypto++ provides a byte oriented implementation
/// \sa <a href="http://www.cryptopp.com/wiki/LEA">LEA</a>,
/// <a href="https://seed.kisa.or.kr/html/egovframework/iwt/ds/ko/ref/LEA%20A%20128-Bit%20Block%20Cipher%20for%20Fast%20Encryption%20on%20Common%20Processors-English.pdf">
/// LEA: A 128-Bit Block Cipher for Fast Encryption on Common Processors</a>
/// \since Crypto++ 8.0
class CRYPTOPP_NO_VTABLE LEA : public LEA_Info, public BlockCipherDocumentation
{
public:
/// \brief LEA block cipher transformation functions
/// \details Provides implementation common to encryption and decryption
/// \since Crypto++ 8.0
class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<LEA_Info>
{
protected:
void UncheckedSetKey(const byte *userKey, unsigned int keyLength, const NameValuePairs ¶ms);
std::string AlgorithmProvider() const;
SecBlock<word32> m_rkey;
mutable SecBlock<word32> m_temp;
unsigned int m_rounds;
};
/// \brief Encryption transformation
/// \details Enc provides implementation for encryption transformation. All key and block
/// sizes are supported.
/// \since Crypto++ 8.0
class CRYPTOPP_NO_VTABLE Enc : public Base
{
public:
void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
#if CRYPTOPP_LEA_ADVANCED_PROCESS_BLOCKS
size_t AdvancedProcessBlocks(const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, size_t length, word32 flags) const;
#endif
};
/// \brief Decryption transformation
/// \details Dec provides implementation for decryption transformation. All key and block
/// sizes are supported.
/// \since Crypto++ 8.0
class CRYPTOPP_NO_VTABLE Dec : public Base
{
public:
void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
#if CRYPTOPP_LEA_ADVANCED_PROCESS_BLOCKS
size_t AdvancedProcessBlocks(const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, size_t length, word32 flags) const;
#endif
};
typedef BlockCipherFinal<ENCRYPTION, Enc> Encryption;
typedef BlockCipherFinal<DECRYPTION, Dec> Decryption;
};
typedef LEA::Encryption LEAEncryption;
typedef LEA::Decryption LEADecryption;
NAMESPACE_END
#endif // CRYPTOPP_LEA_H
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