2015-11-05 06:59:46 +00:00
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// ttmac.h - written and placed in the public domain by Kevin Springle
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#ifndef CRYPTOPP_TTMAC_H
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#define CRYPTOPP_TTMAC_H
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#include "seckey.h"
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#include "iterhash.h"
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#include "secblock.h"
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NAMESPACE_BEGIN(CryptoPP)
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//! _
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class CRYPTOPP_NO_VTABLE TTMAC_Base : public FixedKeyLength<20>, public IteratedHash<word32, LittleEndian, 64, MessageAuthenticationCode>
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{
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public:
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static std::string StaticAlgorithmName() {return std::string("Two-Track-MAC");}
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CRYPTOPP_CONSTANT(DIGESTSIZE=20)
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unsigned int DigestSize() const {return DIGESTSIZE;};
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void UncheckedSetKey(const byte *userKey, unsigned int keylength, const NameValuePairs ¶ms);
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void TruncatedFinal(byte *mac, size_t size);
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protected:
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static void Transform (word32 *digest, const word32 *X, bool last);
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void HashEndianCorrectedBlock(const word32 *data) {Transform(m_digest, data, false);}
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void Init();
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word32* StateBuf() {return m_digest;}
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FixedSizeSecBlock<word32, 10> m_digest;
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FixedSizeSecBlock<word32, 5> m_key;
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};
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//! <a href="http://www.weidai.com/scan-mirror/mac.html#TTMAC">Two-Track-MAC</a>
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/*! 160 Bit MAC with 160 Bit Key */
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DOCUMENTED_TYPEDEF(MessageAuthenticationCodeFinal<TTMAC_Base>, TTMAC)
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NAMESPACE_END
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#endif
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