tea.h

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00001 #ifndef CRYPTOPP_TEA_H
00002 #define CRYPTOPP_TEA_H
00003 
00004 /** \file
00005 */
00006 
00007 #include "seckey.h"
00008 #include "secblock.h"
00009 
00010 NAMESPACE_BEGIN(CryptoPP)
00011 
00012 //! _
00013 struct TEA_Info : public FixedBlockSize<8>, public FixedKeyLength<16>, public VariableRounds<32>
00014 {
00015     static const char *StaticAlgorithmName() {return "TEA";}
00016 };
00017 
00018 /// <a href="http://www.weidai.com/scan-mirror/cs.html#TEA">TEA</a>
00019 class TEA : public TEA_Info, public BlockCipherDocumentation
00020 {
00021     class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<TEA_Info>
00022     {
00023     public:
00024         void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);
00025 
00026     protected:
00027         FixedSizeSecBlock<word32, 4> m_k;
00028         word32 m_limit;
00029     };
00030 
00031     class CRYPTOPP_NO_VTABLE Enc : public Base
00032     {
00033     public:
00034         void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
00035     };
00036 
00037     class CRYPTOPP_NO_VTABLE Dec : public Base
00038     {
00039     public:
00040         void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
00041     };
00042 
00043 public:
00044     typedef BlockCipherFinal<ENCRYPTION, Enc> Encryption;
00045     typedef BlockCipherFinal<DECRYPTION, Dec> Decryption;
00046 };
00047 
00048 typedef TEA::Encryption TEAEncryption;
00049 typedef TEA::Decryption TEADecryption;
00050 
00051 //! _
00052 struct XTEA_Info : public FixedBlockSize<8>, public FixedKeyLength<16>, public VariableRounds<32>
00053 {
00054     static const char *StaticAlgorithmName() {return "XTEA";}
00055 };
00056 
00057 /// <a href="http://www.weidai.com/scan-mirror/cs.html#TEA">XTEA</a>
00058 class XTEA : public XTEA_Info, public BlockCipherDocumentation
00059 {
00060     class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<XTEA_Info>
00061     {
00062     public:
00063         void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);
00064 
00065     protected:
00066         FixedSizeSecBlock<word32, 4> m_k;
00067         word32 m_limit;
00068     };
00069 
00070     class CRYPTOPP_NO_VTABLE Enc : public Base
00071     {
00072     public:
00073         void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
00074     };
00075 
00076     class CRYPTOPP_NO_VTABLE Dec : public Base
00077     {
00078     public:
00079         void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
00080     };
00081 
00082 public:
00083     typedef BlockCipherFinal<ENCRYPTION, Enc> Encryption;
00084     typedef BlockCipherFinal<DECRYPTION, Dec> Decryption;
00085 };
00086 
00087 //! _
00088 struct BTEA_Info : public FixedKeyLength<16>
00089 {
00090     static const char *StaticAlgorithmName() {return "BTEA";}
00091 };
00092 
00093 //! <a href="http://www.weidai.com/scan-mirror/cs.html#TEA">corrected Block TEA</a> (as described in "xxtea").
00094 /*! This class hasn't been tested yet. */
00095 class BTEA : public BTEA_Info, public BlockCipherDocumentation
00096 {
00097     class CRYPTOPP_NO_VTABLE Base : public AlgorithmImpl<SimpleKeyingInterfaceImpl<BlockCipher, BTEA_Info>, BTEA_Info>, public BTEA_Info
00098     {
00099     public:
00100         void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs &params)
00101         {
00102             m_blockSize = params.GetIntValueWithDefault("BlockSize", 60*4);
00103             GetUserKey(BIG_ENDIAN_ORDER, m_k.begin(), 4, key, KEYLENGTH);
00104         }
00105 
00106         unsigned int BlockSize() const {return m_blockSize;}
00107 
00108     protected:
00109         FixedSizeSecBlock<word32, 4> m_k;
00110         unsigned int m_blockSize;
00111     };
00112 
00113     class CRYPTOPP_NO_VTABLE Enc : public Base
00114     {
00115     public:
00116         void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
00117     };
00118 
00119     class CRYPTOPP_NO_VTABLE Dec : public Base
00120     {
00121     public:
00122         void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
00123     };
00124 
00125 public:
00126     typedef BlockCipherFinal<ENCRYPTION, Enc> Encryption;
00127     typedef BlockCipherFinal<DECRYPTION, Dec> Decryption;
00128 };
00129 
00130 NAMESPACE_END
00131 
00132 #endif

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