Crypto++
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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 ¶ms); 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