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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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