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ttmac.h

00001 // ttmac.h - written and placed in the public domain by Kevin Springle
00002 
00003 #ifndef CRYPTOPP_TTMAC_H
00004 #define CRYPTOPP_TTMAC_H
00005 
00006 #include "seckey.h"
00007 #include "iterhash.h"
00008 
00009 NAMESPACE_BEGIN(CryptoPP)
00010 
00011 //! _
00012 class CRYPTOPP_NO_VTABLE TTMAC_Base : public FixedKeyLength<20>, public IteratedHash<word32, LittleEndian, 64, MessageAuthenticationCode>
00013 {
00014 public:
00015     static std::string StaticAlgorithmName() {return std::string("Two-Track-MAC");}
00016     CRYPTOPP_CONSTANT(DIGESTSIZE=20)
00017 
00018     unsigned int DigestSize() const {return DIGESTSIZE;};
00019     void UncheckedSetKey(const byte *userKey, unsigned int keylength, const NameValuePairs &params);
00020     void TruncatedFinal(byte *mac, size_t size);
00021 
00022 protected:
00023     static void Transform (word32 *digest, const word32 *X, bool last);
00024     void HashEndianCorrectedBlock(const word32 *data) {Transform(m_digest, data, false);}
00025     void Init();
00026     word32* StateBuf() {return m_digest;}
00027 
00028     FixedSizeSecBlock<word32, 10> m_digest;
00029     FixedSizeSecBlock<word32, 5> m_key;
00030 };
00031 
00032 //! <a href="http://www.weidai.com/scan-mirror/mac.html#TTMAC">Two-Track-MAC</a>
00033 /*! 160 Bit MAC with 160 Bit Key */
00034 DOCUMENTED_TYPEDEF(MessageAuthenticationCodeFinal<TTMAC_Base>, TTMAC)
00035 
00036 NAMESPACE_END
00037 
00038 #endif

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