rc2.h

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// rc2.h - originally written and placed in the public domain by Wei Dai
 
/// \file rc2.h
/// \brief Classes for the RC2 block cipher
/// \since Crypto++ 3.0
 
#ifndef CRYPTOPP_RC2_H
#define CRYPTOPP_RC2_H
 
#include "seckey.h"
#include "secblock.h"
#include "algparam.h"
 
NAMESPACE_BEGIN(CryptoPP)
 
/// \brief RC2 block cipher information
/// \since Crypto++ 3.0
struct RC2_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 1, 128>
{
    CRYPTOPP_CONSTANT(DEFAULT_EFFECTIVE_KEYLENGTH = 1024);
    CRYPTOPP_CONSTANT(MAX_EFFECTIVE_KEYLENGTH = 1024);
    CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "RC2";}
};
 
/// \brief RC2 block cipher
/// \sa <a href="http://www.cryptopp.com/wiki/RC2">RC2</a> on the Crypto Lounge.
/// \since Crypto++ 3.0
class RC2 : public RC2_Info, public BlockCipherDocumentation
{
    /// \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
    };
 
    /// \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;
    };
 
    /// \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:
 
    /// \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));}
    };
 
    /// \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