rc2.h
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// rc2.h - written and placed in the public domain by Wei Dai
//! \file rc2.h
//! \brief Classes for the RC2 block cipher
#ifndef CRYPTOPP_RC2_H
#define CRYPTOPP_RC2_H
#include "seckey.h"
#include "secblock.h"
#include "algparam.h"
NAMESPACE_BEGIN(CryptoPP)
//! \class RC2_Info
//! \brief RC2 block cipher information
struct RC2_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 1, 128>
{
CRYPTOPP_CONSTANT(DEFAULT_EFFECTIVE_KEYLENGTH = 1024)
CRYPTOPP_CONSTANT(MAX_EFFECTIVE_KEYLENGTH = 1024)
CRYPTOPP_CONSTEXPR static const char *StaticAlgorithmName() {return "RC2";}
};
//! \class RC2
//! \brief RC2 block cipher
//! \sa <a href="http://www.weidai.com/scan-mirror/cs.html#RC2">RC2</a> on the Crypto Lounge.
class RC2 : public RC2_Info, public BlockCipherDocumentation
{
//! \class Base
//! \brief Class specific methods used to operate the cipher.
//! \details Implementations and overrides in \p Base apply to both \p ENCRYPTION and \p DECRYPTION directions
class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<RC2_Info>
{
public:
void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);
unsigned int OptimalDataAlignment() const {return GetAlignmentOf<word16>();}
protected:
FixedSizeSecBlock<word16, 64> K; // expanded key table
};
//! \class Enc
//! \brief Class specific methods used to operate the cipher in the forward direction.
//! \details Implementations and overrides in \p Enc apply to \p ENCRYPTION.
class CRYPTOPP_NO_VTABLE Enc : public Base
{
public:
void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
};
//! \class Dec
//! \brief Class specific methods used to operate the cipher in the reverse direction.
//! \details Implementations and overrides in \p Dec apply to \p DECRYPTION.
class CRYPTOPP_NO_VTABLE Dec : public Base
{
public:
void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
};
public:
//! \class Encryption
//! \brief Class specific methods used to operate the cipher in the forward direction.
//! \details Implementations and overrides in \p Encryption apply to \p ENCRYPTION.
class Encryption : public BlockCipherFinal<ENCRYPTION, Enc>
{
public:
Encryption() {}
Encryption(const byte *key, size_t keyLen=DEFAULT_KEYLENGTH)
{SetKey(key, keyLen);}
Encryption(const byte *key, size_t keyLen, int effectiveKeyLen)
{SetKey(key, keyLen, MakeParameters("EffectiveKeyLength", effectiveKeyLen));}
};
//! \class Decryption
//! \brief Class specific methods used to operate the cipher in the reverse direction.
//! \details Implementations and overrides in \p Decryption apply to \p DECRYPTION.
class Decryption : public BlockCipherFinal<DECRYPTION, Dec>
{
public:
Decryption() {}
Decryption(const byte *key, size_t keyLen=DEFAULT_KEYLENGTH)
{SetKey(key, keyLen);}
Decryption(const byte *key, size_t keyLen, int effectiveKeyLen)
{SetKey(key, keyLen, MakeParameters("EffectiveKeyLength", effectiveKeyLen));}
};
};
typedef RC2::Encryption RC2Encryption;
typedef RC2::Decryption RC2Decryption;
NAMESPACE_END
#endif
RC2
RC2 block cipher.
Definition: rc2.h:27
MakeParameters
AlgorithmParameters MakeParameters(const char *name, const T &value, bool throwIfNotUsed=true)
Create an object that implements NameValuePairs.
Definition: algparam.h:554
secblock.h
Classes and functions for secure memory allocations.
RC2::Decryption
Class specific methods used to operate the cipher in the reverse direction.
Definition: rc2.h:78
RC2::Encryption
Class specific methods used to operate the cipher in the forward direction.
Definition: rc2.h:65
FixedBlockSize
Inherited by algorithms with fixed block size.
Definition: seckey.h:34
BlockCipherImpl
Provides a base implementation of Algorithm and SimpleKeyingInterface for block ciphers.
Definition: seckey.h:326
RC2_Info
RC2 block cipher information.
Definition: rc2.h:17
BlockCipherDocumentation
Provides Encryption and Decryption typedefs used by derived classes to implement a block cipher.
Definition: seckey.h:423
seckey.h
Classes and functions for implementing secret key algorithms.
BlockCipherFinal
Provides class member functions to key a block cipher.
Definition: seckey.h:339
FixedSizeSecBlock< word16, 64 >
CryptoPP
Crypto++ library namespace.
VariableKeyLength< 16, 1, 128 >::DEFAULT_KEYLENGTH
static const int DEFAULT_KEYLENGTH
The default key length used by the algorithm provided as a constant.
Definition: seckey.h:196
NameValuePairs
Interface for retrieving values given their names.
Definition: cryptlib.h:277
algparam.h
Classes for working with NameValuePairs.
VariableKeyLength
Inherited by keyed algorithms with variable key length.
Definition: seckey.h:177