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# 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(CipherDir direction, const byte *userKey, unsigned int length);
    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(CipherDir direction, const byte *userKey, unsigned int length = 8);
    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