Crypto++
cast.h
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00001 #ifndef CRYPTOPP_CAST_H
00002 #define CRYPTOPP_CAST_H
00003 
00004 /** \file
00005 */
00006 
00007 #include "seckey.h"
00008 #include "secblock.h"
00009 
00010 NAMESPACE_BEGIN(CryptoPP)
00011 
00012 class CAST
00013 {
00014 protected:
00015     static const word32 S[8][256];
00016 };
00017 
00018 //! algorithm info
00019 struct CAST128_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 5, 16>
00020 {
00021     static const char *StaticAlgorithmName() {return "CAST-128";}
00022 };
00023 
00024 /// <a href="http://www.weidai.com/scan-mirror/cs.html#CAST-128">CAST-128</a>
00025 class CAST128 : public CAST128_Info, public BlockCipherDocumentation
00026 {
00027     class CRYPTOPP_NO_VTABLE Base : public CAST, public BlockCipherImpl<CAST128_Info>
00028     {
00029     public:
00030         void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);
00031 
00032     protected:
00033         bool reduced;
00034         FixedSizeSecBlock<word32, 32> K;
00035     };
00036 
00037     class CRYPTOPP_NO_VTABLE Enc : public Base
00038     {
00039     public:
00040         void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
00041     };
00042 
00043     class CRYPTOPP_NO_VTABLE Dec : public Base
00044     {
00045     public:
00046         void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
00047     };
00048 
00049 public:
00050     typedef BlockCipherFinal<ENCRYPTION, Enc> Encryption;
00051     typedef BlockCipherFinal<DECRYPTION, Dec> Decryption;
00052 };
00053 
00054 //! algorithm info
00055 struct CAST256_Info : public FixedBlockSize<16>, public VariableKeyLength<16, 16, 32>
00056 {
00057     static const char *StaticAlgorithmName() {return "CAST-256";}
00058 };
00059 
00060 //! <a href="http://www.weidai.com/scan-mirror/cs.html#CAST-256">CAST-256</a>
00061 class CAST256 : public CAST256_Info, public BlockCipherDocumentation
00062 {
00063     class CRYPTOPP_NO_VTABLE Base : public CAST, public BlockCipherImpl<CAST256_Info>
00064     {
00065     public:
00066         void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);
00067         void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
00068 
00069     protected:
00070         static const word32 t_m[8][24];
00071         static const unsigned int t_r[8][24];
00072 
00073         static void Omega(int i, word32 kappa[8]);
00074 
00075         FixedSizeSecBlock<word32, 8*12> K;
00076     };
00077 
00078 public:
00079     typedef BlockCipherFinal<ENCRYPTION, Base> Encryption;
00080     typedef BlockCipherFinal<DECRYPTION, Base> Decryption;
00081 };
00082 
00083 typedef CAST128::Encryption CAST128Encryption;
00084 typedef CAST128::Decryption CAST128Decryption;
00085 
00086 typedef CAST256::Encryption CAST256Encryption;
00087 typedef CAST256::Decryption CAST256Decryption;
00088 
00089 NAMESPACE_END
00090 
00091 #endif