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// cham.h - written and placed in the public domain by Kim Sung Hee and Jeffrey Walton
// Based on "CHAM: A Family of Lightweight Block Ciphers for
// Resource-Constrained Devices" by Bonwook Koo, Dongyoung Roh,
// Hyeonjin Kim, Younghoon Jung, Dong-Geon Lee, and Daesung Kwon
/// \file cham.h
/// \brief Classes for the CHAM block cipher
/// \since Crypto++ 8.0
#ifndef CRYPTOPP_CHAM_H
#define CRYPTOPP_CHAM_H
#include "config.h"
#include "seckey.h"
#include "secblock.h"
#include "algparam.h"
#if (CRYPTOPP_BOOL_X64 || CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X86)
# define CRYPTOPP_CHAM128_ADVANCED_PROCESS_BLOCKS 1
#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_CHAM128_ADVANCED_PROCESS_BLOCKS
#endif
NAMESPACE_BEGIN(CryptoPP)
/// \brief CHAM block cipher information
/// \since Crypto++ 8.0
struct CHAM64_Info : public FixedBlockSize<8>, public FixedKeyLength<16>
{
/// \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 "CHAM-64";
}
};
/// \brief CHAM block cipher information
/// \since Crypto++ 8.0
struct CHAM128_Info : public FixedBlockSize<16>, public VariableKeyLength<16,16,32,16>
{
/// \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 "CHAM-128";
}
};
/// \brief CHAM 64-bit block cipher
/// \details CHAM64 provides 64-bit block size. The valid key size is 128-bit.
/// \note Crypto++ provides a byte oriented implementation
/// \sa CHAM128, <a href="http://www.cryptopp.com/wiki/CHAM">CHAM</a>,
/// <a href="https://pdfs.semanticscholar.org/2f57/61b5c2614cffd58a09cc83c375a2b32a2ed3.pdf">
/// CHAM: A Family of Lightweight Block Ciphers for Resource-Constrained Devices</a>
/// \since Crypto++ 8.0
class CRYPTOPP_NO_VTABLE CHAM64 : public CHAM64_Info, public BlockCipherDocumentation
{
public:
/// \brief CHAM block cipher transformation functions
/// \details Provides implementation common to encryption and decryption
/// \since Crypto++ 8.0
class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<CHAM64_Info>
{
protected:
void UncheckedSetKey(const byte *userKey, unsigned int keyLength, const NameValuePairs ¶ms);
SecBlock<word16> m_rk;
mutable FixedSizeSecBlock<word16, 4> m_x;
unsigned int m_kw;
};
/// \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;
};
/// \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;
};
/// \brief CHAM64 encryption
typedef BlockCipherFinal<ENCRYPTION, Enc> Encryption;
/// \brief CHAM64 decryption
typedef BlockCipherFinal<DECRYPTION, Dec> Decryption;
};
/// \brief CHAM64 encryption
typedef CHAM64::Encryption CHAM64Encryption;
/// \brief CHAM64 decryption
typedef CHAM64::Decryption CHAM64Decryption;
/// \brief CHAM 128-bit block cipher
/// \details CHAM128 provides 128-bit block size. The valid key size is 128-bit and 256-bit.
/// \note Crypto++ provides a byte oriented implementation
/// \sa CHAM64, <a href="http://www.cryptopp.com/wiki/CHAM">CHAM</a>,
/// <a href="https://pdfs.semanticscholar.org/2f57/61b5c2614cffd58a09cc83c375a2b32a2ed3.pdf">
/// CHAM: A Family of Lightweight Block Ciphers for Resource-Constrained Devices</a>
/// \since Crypto++ 8.0
class CRYPTOPP_NO_VTABLE CHAM128 : public CHAM128_Info, public BlockCipherDocumentation
{
public:
/// \brief CHAM block cipher transformation functions
/// \details Provides implementation common to encryption and decryption
/// \since Crypto++ 8.0
class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<CHAM128_Info>
{
protected:
void UncheckedSetKey(const byte *userKey, unsigned int keyLength, const NameValuePairs ¶ms);
std::string AlgorithmProvider() const;
SecBlock<word32> m_rk;
mutable FixedSizeSecBlock<word32, 4> m_x;
unsigned int m_kw;
};
/// \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_CHAM128_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_CHAM128_ADVANCED_PROCESS_BLOCKS
size_t AdvancedProcessBlocks(const byte *inBlocks, const byte *xorBlocks, byte *outBlocks, size_t length, word32 flags) const;
#endif
};
/// \brief CHAM128 encryption
typedef BlockCipherFinal<ENCRYPTION, Enc> Encryption;
/// \brief CHAM128 decryption
typedef BlockCipherFinal<DECRYPTION, Dec> Decryption;
};
/// \brief CHAM128 encryption
typedef CHAM128::Encryption CHAM128Encryption;
/// \brief CHAM128 decryption
typedef CHAM128::Decryption CHAM128Decryption;
NAMESPACE_END
#endif // CRYPTOPP_CHAM_H
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