cast.h
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// cast.h - written and placed in the public domain by Wei Dai
//! \file cast.h
//! \brief Classes for the CAST-128 and CAST-256 block ciphers
#ifndef CRYPTOPP_CAST_H
#define CRYPTOPP_CAST_H
#include "seckey.h"
#include "secblock.h"
NAMESPACE_BEGIN(CryptoPP)
//! \class CAST
//! \brief CAST block cipher base
class CAST
{
protected:
static const word32 S[8][256];
};
//! \class CAST128_Info
//! \brief CAST128 block cipher information
struct CAST128_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 5, 16>
{
CRYPTOPP_CONSTEXPR static const char *StaticAlgorithmName() {return "CAST-128";}
};
//! \class CAST128
//! \brief CAST128 block cipher
//! \sa <a href="http://www.weidai.com/scan-mirror/cs.html#CAST-128">CAST-128</a>
class CAST128 : public CAST128_Info, public BlockCipherDocumentation
{
//! \class Base
//! \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;
};
//! \class Enc
//! \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;
};
//! \class Dec
//! \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;
};
//! \class CAST256_Info
//! \brief CAST256 block cipher information
struct CAST256_Info : public FixedBlockSize<16>, public VariableKeyLength<16, 16, 32, 4>
{
CRYPTOPP_CONSTEXPR static const char *StaticAlgorithmName() {return "CAST-256";}
};
//! \class CAST256
//! \brief CAST256 block cipher
//! \sa <a href="http://www.weidai.com/scan-mirror/cs.html#CAST-256">CAST-256</a>
class CAST256 : public CAST256_Info, public BlockCipherDocumentation
{
//! \class Base
//! \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;
};
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
BlockCipherDocumentation
Provides Encryption and Decryption typedefs used by derived classes to implement a block cipher...
Definition: seckey.h:423
secblock.h
Classes and functions for secure memory allocations.
CAST128
CAST128 block cipher.
Definition: cast.h:32
FixedBlockSize
Inherited by algorithms with fixed block size.
Definition: seckey.h:34
CAST256
CAST256 block cipher.
Definition: cast.h:77
seckey.h
Classes and functions for implementing secret key algorithms.
BlockCipherFinal< ENCRYPTION, Enc >
FixedSizeSecBlock< word32, 32 >
CAST
CAST block cipher base.
Definition: cast.h:16
VariableKeyLength
Inherited by keyed algorithms with variable key length.
Definition: seckey.h:177
CAST256_Info
CAST256 block cipher information.
Definition: cast.h:69
BlockCipherImpl
Provides a base implementation of Algorithm and SimpleKeyingInterface for block ciphers.
Definition: seckey.h:326
CryptoPP
Crypto++ library namespace.
CAST128_Info
CAST128 block cipher information.
Definition: cast.h:24
NameValuePairs
Interface for retrieving values given their names.
Definition: cryptlib.h:277