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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         enum {DIGESTSIZE=20};
    00017
    00018         TTMAC_Base() {SetStateSize(DIGESTSIZE*2);}
    00019
    00020         unsigned int DigestSize() const {return DIGESTSIZE;};
    00021         void UncheckedSetKey(const byte *userKey, unsigned int keylength);
    00022         void TruncatedFinal(byte *mac, size_t size);
    00023
    00024 protected:
    00025         static void Transform (word32 *digest, const word32 *X, bool last);
    00026         void HashEndianCorrectedBlock(const word32 *data) {Transform(m_digest, data, false);}
    00027         void Init();
    00028
    00029         FixedSizeSecBlock<word32, DIGESTSIZE> 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