haval.h

#ifndef CRYPTOPP_HAVAL_H
#define CRYPTOPP_HAVAL_H

#include "iterhash.h"

NAMESPACE_BEGIN(CryptoPP)

/// <a href="http://www.weidai.com/scan-mirror/md.html#HAVAL">HAVAL</a>
/*! \warning HAVAL with 128-bit or 160-bit output is considered insecure, and should not be used
        unless you absolutely need it for compatibility. */
class HAVAL : public IteratedHash<word32, LittleEndian, 128>
{
public:
        enum {HAVAL_VERSION = 1};
        CRYPTOPP_CONSTANT(DIGESTSIZE = 32)

        /// digestSize can be 16, 20, 24, 28, or 32 (Default=32)<br>
        /// pass can be 3, 4 or 5 (Default=3)
        HAVAL(unsigned int digestSize=DIGESTSIZE, unsigned int passes=3);
        void TruncatedFinal(byte *hash, size_t size);
        unsigned int DigestSize() const {return digestSize;}

        static const char * StaticAlgorithmName() {return "HAVAL";}
        std::string AlgorithmName() const {return std::string("HAVAL(") + IntToString(digestSize) + "," + IntToString(pass) + ")";}

protected:
        static const unsigned int wi2[32], wi3[32], wi4[32], wi5[32];
        static const word32 mc2[32], mc3[32], mc4[32], mc5[32];

        void Init();
        void Tailor(unsigned int FPTLEN);
        void HashEndianCorrectedBlock(const word32 *in);

        const unsigned int digestSize, pass;
};

/// <a href="http://www.weidai.com/scan-mirror/md.html#HAVAL">HAVAL</a> with 3 passes
class HAVAL3 : public HAVAL
{
public:
        HAVAL3(unsigned int digestSize=DIGESTSIZE) : HAVAL(digestSize, 3) {}
        static void Transform(word32 *buf, const word32 *in);
};

/// <a href="http://www.weidai.com/scan-mirror/md.html#HAVAL">HAVAL</a> with 4 passes
class HAVAL4 : public HAVAL
{
public:
        HAVAL4(unsigned int digestSize=DIGESTSIZE) : HAVAL(digestSize, 4) {}
        static void Transform(word32 *buf, const word32 *in);
};

/// <a href="http://www.weidai.com/scan-mirror/md.html#HAVAL">HAVAL</a> with 5 passes
class HAVAL5 : public HAVAL
{
public:
        HAVAL5(unsigned int digestSize=DIGESTSIZE) : HAVAL(digestSize, 5) {}
        static void Transform(word32 *buf, const word32 *in);
};

NAMESPACE_END

#endif

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