cast.h
Go to the documentation of this file.
// cast.h - originally written and placed in the public domain by Wei Dai
/// \file cast.h
/// \brief Classes for the CAST-128 and CAST-256 block ciphers
/// \since Crypto++ 2.2
#ifndef CRYPTOPP_CAST_H
#define CRYPTOPP_CAST_H
#include "seckey.h"
#include "secblock.h"
NAMESPACE_BEGIN(CryptoPP)
/// \brief CAST block cipher base
/// \since Crypto++ 2.2
class CAST
{
protected:
static const word32 S[8][256];
};
/// \brief CAST128 block cipher information
/// \since Crypto++ 2.2
struct CAST128_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 5, 16>
{
CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "CAST-128";}
};
/// \brief CAST128 block cipher
/// \sa <a href="http://www.cryptopp.com/wiki/CAST-128">CAST-128</a>
/// \since Crypto++ 2.2
class CAST128 : public CAST128_Info, public BlockCipherDocumentation
{
/// \brief CAST128 block cipher default operation
class CRYPTOPP_NO_VTABLE Base : public CAST, public BlockCipherImpl<CAST128_Info>
{
public:
void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);
protected:
bool reduced;
FixedSizeSecBlock<word32, 32> K;
mutable FixedSizeSecBlock<word32, 3> m_t;
};
/// \brief CAST128 block cipher encryption operation
class CRYPTOPP_NO_VTABLE Enc : public Base
{
public:
void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
};
/// \brief CAST128 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 CAST256 block cipher information
/// \since Crypto++ 4.0
struct CAST256_Info : public FixedBlockSize<16>, public VariableKeyLength<16, 16, 32, 4>
{
CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "CAST-256";}
};
/// \brief CAST256 block cipher
/// \sa <a href="http://www.cryptopp.com/wiki/CAST-256">CAST-256</a>
/// \since Crypto++ 4.0
class CAST256 : public CAST256_Info, public BlockCipherDocumentation
{
/// \brief CAST256 block cipher default operation
class CRYPTOPP_NO_VTABLE Base : public CAST, public BlockCipherImpl<CAST256_Info>
{
public:
void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);
void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
protected:
static const word32 t_m[8][24];
static const unsigned int t_r[8][24];
static void Omega(int i, word32 kappa[8]);
FixedSizeSecBlock<word32, 8*12> K;
mutable FixedSizeSecBlock<word32, 8> kappa;
mutable FixedSizeSecBlock<word32, 3> m_t;
};
public:
typedef BlockCipherFinal<ENCRYPTION, Base> Encryption;
typedef BlockCipherFinal<DECRYPTION, Base> Decryption;
};
typedef CAST128::Encryption CAST128Encryption;
typedef CAST128::Decryption CAST128Decryption;
typedef CAST256::Encryption CAST256Encryption;
typedef CAST256::Decryption CAST256Decryption;
NAMESPACE_END
#endif
BlockCipherFinal< ENCRYPTION, Enc >
BlockCipherImpl
Provides a base implementation of Algorithm and SimpleKeyingInterface for block ciphers.
Definition: seckey.h:306
CAST128
CAST128 block cipher.
Definition: cast.h:34
CAST256
CAST256 block cipher.
Definition: cast.h:77
CAST
CAST block cipher base.
Definition: cast.h:18
FixedBlockSize
Inherited by algorithms with fixed block size.
Definition: seckey.h:41
FixedSizeSecBlock< word32, 32 >
NameValuePairs
Interface for retrieving values given their names.
Definition: cryptlib.h:322
VariableKeyLength
Inherited by keyed algorithms with variable key length.
Definition: seckey.h:166
word32
unsigned int word32
32-bit unsigned datatype
Definition: config_int.h:62
CryptoPP
Crypto++ library namespace.
secblock.h
Classes and functions for secure memory allocations.
seckey.h
Classes and functions for implementing secret key algorithms.
BlockCipherDocumentation
Provides Encryption and Decryption typedefs used by derived classes to implement a block cipher.
Definition: seckey.h:399
CAST128_Info
CAST128 block cipher information.
Definition: cast.h:26
CAST256_Info
CAST256 block cipher information.
Definition: cast.h:69