96 lines
3.1 KiB
C++
96 lines
3.1 KiB
C++
// rc2.h - written and placed in the public domain by Wei Dai
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//! \file rc2.h
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//! \brief Classes for the RC2 block cipher
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#ifndef CRYPTOPP_RC2_H
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#define CRYPTOPP_RC2_H
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#include "seckey.h"
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#include "secblock.h"
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#include "algparam.h"
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NAMESPACE_BEGIN(CryptoPP)
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//! \class RC2_Info
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//! \brief The RC2 cipher's key, iv, block size and name information.
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struct RC2_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 1, 128>
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{
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CRYPTOPP_CONSTANT(DEFAULT_EFFECTIVE_KEYLENGTH = 1024)
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CRYPTOPP_CONSTANT(MAX_EFFECTIVE_KEYLENGTH = 1024)
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static const char *StaticAlgorithmName() {return "RC2";}
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};
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//! \class RC2
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//! \brief The RC2 stream cipher
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//! \sa <a href="http://www.weidai.com/scan-mirror/cs.html#RC2">RC2</a> on the Crypto Lounge.
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class RC2 : public RC2_Info, public BlockCipherDocumentation
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{
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//! \class Base
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//! \brief Class specific methods used to operate the cipher.
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//! \details Implementations and overrides in \p Base apply to both \p ENCRYPTION and \p DECRYPTION directions
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class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<RC2_Info>
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{
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public:
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void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs ¶ms);
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unsigned int OptimalDataAlignment() const {return GetAlignmentOf<word16>();}
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protected:
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FixedSizeSecBlock<word16, 64> K; // expanded key table
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};
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//! \class Enc
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//! \brief Class specific methods used to operate the cipher in the forward direction.
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//! \details Implementations and overrides in \p Enc apply to \p ENCRYPTION.
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class CRYPTOPP_NO_VTABLE Enc : public Base
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{
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public:
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void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
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};
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//! \class Dec
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//! \brief Class specific methods used to operate the cipher in the reverse direction.
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//! \details Implementations and overrides in \p Dec apply to \p DECRYPTION.
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class CRYPTOPP_NO_VTABLE Dec : public Base
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{
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public:
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void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
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};
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public:
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//! \class Encryption
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//! \brief Class specific methods used to operate the cipher in the forward direction.
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//! \details Implementations and overrides in \p Encryption apply to \p ENCRYPTION.
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class Encryption : public BlockCipherFinal<ENCRYPTION, Enc>
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{
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public:
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Encryption() {}
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Encryption(const byte *key, size_t keyLen=DEFAULT_KEYLENGTH)
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{SetKey(key, keyLen);}
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Encryption(const byte *key, size_t keyLen, int effectiveKeyLen)
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{SetKey(key, keyLen, MakeParameters("EffectiveKeyLength", effectiveKeyLen));}
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};
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//! \class Decryption
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//! \brief Class specific methods used to operate the cipher in the reverse direction.
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//! \details Implementations and overrides in \p Decryption apply to \p DECRYPTION.
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class Decryption : public BlockCipherFinal<DECRYPTION, Dec>
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{
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public:
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Decryption() {}
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Decryption(const byte *key, size_t keyLen=DEFAULT_KEYLENGTH)
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{SetKey(key, keyLen);}
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Decryption(const byte *key, size_t keyLen, int effectiveKeyLen)
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{SetKey(key, keyLen, MakeParameters("EffectiveKeyLength", effectiveKeyLen));}
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};
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};
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typedef RC2::Encryption RC2Encryption;
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typedef RC2::Decryption RC2Decryption;
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NAMESPACE_END
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#endif
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