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// ttmac.h - written and placed in the public domain by Kevin Springle
#ifndef CRYPTOPP_TTMAC_H
#define CRYPTOPP_TTMAC_H
#include "seckey.h"
#include "iterhash.h"
NAMESPACE_BEGIN(CryptoPP)
//! <a href="http://www.eskimo.com/~weidai/scan-mirror/mac.html#Two-Track-MAC">Two-Track-MAC</a>
/*! 160 Bit MAC with 160 Bit Key */
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");}
enum {DIGESTSIZE=20};
TTMAC_Base() {SetStateSize(DIGESTSIZE*2);}
unsigned int DigestSize() const {return DIGESTSIZE;};
void UncheckedSetKey(const byte *userKey, unsigned int keylength);
void TruncatedFinal(byte *mac, unsigned int size);
protected:
static void Transform (word32 *digest, const word32 *X, bool last);
void HashEndianCorrectedBlock(const word32 *data) {Transform(m_digest, data, false);}
void Init();
FixedSizeSecBlock<word32, DIGESTSIZE> m_key;
};
//! <a href="http://www.weidai.com/scan-mirror/mac.html#TTMAC">Two-Track-MAC</a>
typedef MessageAuthenticationCodeFinal<TTMAC_Base> TTMAC;
NAMESPACE_END
#endif
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