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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 Base : public BlockCipher
00017         {
00018         public:
00019                 unsigned int GetAlignment() const {return 1;}
00020                 void UncheckedSetKey(CipherDir dir, const byte *userkey, unsigned int length, unsigned nof_rounds);
00021 
00022                 bool strengthened;
00023                 SecByteBlock keySchedule;
00024                 static const byte exp_tab[256];
00025                 static const byte log_tab[256];
00026         };
00027 
00028         class Enc : public Base
00029         {
00030         public:
00031                 void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
00032         };
00033 
00034         class Dec : public Base
00035         {
00036         public:
00037                 void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
00038         };
00039 };
00040 
00041 struct SAFER_K_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 8, 16, 8>, public VariableRounds<10, 1, 13>
00042 {
00043         static const char *StaticAlgorithmName() {return "SAFER-K";}
00044         static unsigned int DefaultRounds(unsigned int keylength) {return keylength == 8 ? 6 : 10;}
00045 };
00046 
00047 /// <a href="http://www.weidai.com/scan-mirror/cs.html#SAFER-K">SAFER-K</a>
00048 class SAFER_K : public SAFER_K_Info, public SAFER, public BlockCipherDocumentation
00049 {
00050         class Enc : public BlockCipherBaseTemplate<SAFER_K_Info, SAFER::Enc>
00051         {
00052         public:
00053                 Enc() {strengthened = false;}
00054         };
00055 
00056         class Dec : public BlockCipherBaseTemplate<SAFER_K_Info, SAFER::Dec>
00057         {
00058         public:
00059                 Dec() {strengthened = false;}
00060         };
00061 
00062 public:
00063         typedef BlockCipherTemplate<ENCRYPTION, Enc> Encryption;
00064         typedef BlockCipherTemplate<DECRYPTION, Dec> Decryption;
00065 };
00066 
00067 struct SAFER_SK_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 8, 16, 8>, public VariableRounds<10, 1, 13>
00068 {
00069         static const char *StaticAlgorithmName() {return "SAFER-SK";}
00070         static unsigned int DefaultRounds(unsigned int keylength) {return keylength == 8 ? 8 : 10;}
00071 };
00072 
00073 /// <a href="http://www.weidai.com/scan-mirror/cs.html#SAFER-SK">SAFER-SK</a>
00074 class SAFER_SK : public SAFER_SK_Info, public SAFER, public BlockCipherDocumentation
00075 {
00076         class Enc : public BlockCipherBaseTemplate<SAFER_SK_Info, SAFER::Enc>
00077         {
00078         public:
00079                 Enc() {strengthened = true;}
00080         };
00081 
00082         class Dec : public BlockCipherBaseTemplate<SAFER_SK_Info, SAFER::Dec>
00083         {
00084         public:
00085                 Dec() {strengthened = true;}
00086         };
00087 
00088 public:
00089         typedef BlockCipherTemplate<ENCRYPTION, Enc> Encryption;
00090         typedef BlockCipherTemplate<DECRYPTION, Dec> Decryption;
00091 };
00092 
00093 typedef SAFER_K::Encryption SAFER_K_Encryption;
00094 typedef SAFER_K::Decryption SAFER_K_Decryption;
00095 
00096 typedef SAFER_SK::Encryption SAFER_SK_Encryption;
00097 typedef SAFER_SK::Decryption SAFER_SK_Decryption;
00098 
00099 NAMESPACE_END
00100 
00101 #endif

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