ttmac.h

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// ttmac.h - written and placed in the public domain by Kevin Springle

/// \file ttmac.h
/// \brief Classes for the TTMAC message authentication code

#ifndef CRYPTOPP_TTMAC_H
#define CRYPTOPP_TTMAC_H

#include "seckey.h"
#include "iterhash.h"
#include "secblock.h"

NAMESPACE_BEGIN(CryptoPP)

/// \brief TTMAC message authentication code information
class CRYPTOPP_NO_VTABLE TTMAC_Base : public FixedKeyLength<20>, public IteratedHash<word32, LittleEndian, 64, MessageAuthenticationCode>
{
public:
    static std::string StaticAlgorithmName() {return std::string("Two-Track-MAC");}
    CRYPTOPP_CONSTANT(DIGESTSIZE=20);

    unsigned int DigestSize() const {return DIGESTSIZE;};
    void UncheckedSetKey(const byte *userKey, unsigned int keylength, const NameValuePairs &params);
    void TruncatedFinal(byte *mac, size_t size);

protected:
    static void Transform (word32 *digest, const word32 *X, bool last);
    void HashEndianCorrectedBlock(const word32 *data) {Transform(m_digest, data, false);}
    void Init();
    word32* StateBuf() {return m_digest;}

    FixedSizeSecBlock<word32, 10> m_digest;
    FixedSizeSecBlock<word32, 5> m_key;
};

/// \brief Two-Track-MAC message authentication code
/// \tparam T HashTransformation class
/// \details 160-bit MAC with 160-bit key
/// \sa MessageAuthenticationCode(), <a href="http://www.weidai.com/scan-mirror/mac.html#TTMAC">Two-Track-MAC</a>
DOCUMENTED_TYPEDEF(MessageAuthenticationCodeFinal<TTMAC_Base>, TTMAC);

NAMESPACE_END

#endif