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safer.h

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00001 #ifndef CRYPTOPP_SAFER_H
00002 #define CRYPTOPP_SAFER_H
00003 
00004 /** \file
00005 */
00006 
00007 #include "seckey.h"
00008 #include "secblock.h"
00009 
00010 NAMESPACE_BEGIN(CryptoPP)
00011 
00012 /// base class, do not use directly
00013 class SAFER
00014 {
00015 public:
00016     class CRYPTOPP_NO_VTABLE Base : public BlockCipher
00017     {
00018     public:
00019         unsigned int OptimalDataAlignment() const {return 1;}
00020         void UncheckedSetKey(const byte *userkey, unsigned int length, const NameValuePairs &params);
00021 
00022     protected:
00023         virtual bool Strengthened() const =0;
00024 
00025         SecByteBlock keySchedule;
00026         static const byte exp_tab[256];
00027         static const byte log_tab[256];
00028     };
00029 
00030     class CRYPTOPP_NO_VTABLE Enc : public Base
00031     {
00032     public:
00033         void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
00034     };
00035 
00036     class CRYPTOPP_NO_VTABLE Dec : public Base
00037     {
00038     public:
00039         void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
00040     };
00041 };
00042 
00043 template <class BASE, class INFO, bool STR>
00044 class CRYPTOPP_NO_VTABLE SAFER_Impl : public BlockCipherImpl<INFO, BASE>
00045 {
00046 protected:
00047     bool Strengthened() const {return STR;}
00048 };
00049 
00050 //! _
00051 struct SAFER_K_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 8, 16, 8>, public VariableRounds<10, 1, 13>
00052 {
00053     static const char *StaticAlgorithmName() {return "SAFER-K";}
00054 };
00055 
00056 /// <a href="http://www.weidai.com/scan-mirror/cs.html#SAFER-K">SAFER-K</a>
00057 class SAFER_K : public SAFER_K_Info, public SAFER, public BlockCipherDocumentation
00058 {
00059 public:
00060     typedef BlockCipherFinal<ENCRYPTION, SAFER_Impl<Enc, SAFER_K_Info, false> > Encryption;
00061     typedef BlockCipherFinal<DECRYPTION, SAFER_Impl<Dec, SAFER_K_Info, false> > Decryption;
00062 };
00063 
00064 //! _
00065 struct SAFER_SK_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 8, 16, 8>, public VariableRounds<10, 1, 13>
00066 {
00067     static const char *StaticAlgorithmName() {return "SAFER-SK";}
00068 };
00069 
00070 /// <a href="http://www.weidai.com/scan-mirror/cs.html#SAFER-SK">SAFER-SK</a>
00071 class SAFER_SK : public SAFER_SK_Info, public SAFER, public BlockCipherDocumentation
00072 {
00073 public:
00074     typedef BlockCipherFinal<ENCRYPTION, SAFER_Impl<Enc, SAFER_SK_Info, true> > Encryption;
00075     typedef BlockCipherFinal<DECRYPTION, SAFER_Impl<Dec, SAFER_SK_Info, true> > Decryption;
00076 };
00077 
00078 typedef SAFER_K::Encryption SAFER_K_Encryption;
00079 typedef SAFER_K::Decryption SAFER_K_Decryption;
00080 
00081 typedef SAFER_SK::Encryption SAFER_SK_Encryption;
00082 typedef SAFER_SK::Decryption SAFER_SK_Decryption;
00083 
00084 NAMESPACE_END
00085 
00086 #endif

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