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haval.h

00001 #ifndef CRYPTOPP_HAVAL_H
00002 #define CRYPTOPP_HAVAL_H
00003 
00004 #include "iterhash.h"
00005 
00006 NAMESPACE_BEGIN(CryptoPP)
00007 
00008 /// <a href="http://www.weidai.com/scan-mirror/md.html#HAVAL">HAVAL</a>
00009 /*! \warning HAVAL with 128-bit or 160-bit output is considered insecure, and should not be used
00010         unless you absolutely need it for compatibility. */
00011 class HAVAL : public IteratedHash<word32, LittleEndian, 128>
00012 {
00013 public:
00014         enum {DIGESTSIZE = 32, HAVAL_VERSION = 1};
00015 
00016         /// digestSize can be 16, 20, 24, 28, or 32 (Default=32)<br>
00017         /// pass can be 3, 4 or 5 (Default=3)
00018         HAVAL(unsigned int digestSize=DIGESTSIZE, unsigned int passes=3);
00019         void TruncatedFinal(byte *hash, size_t size);
00020         unsigned int DigestSize() const {return digestSize;}
00021 
00022         static const char * StaticAlgorithmName() {return "HAVAL";}
00023         std::string AlgorithmName() const {return std::string("HAVAL(") + IntToString(digestSize) + "," + IntToString(pass) + ")";}
00024 
00025 protected:
00026         static const unsigned int wi2[32], wi3[32], wi4[32], wi5[32];
00027         static const word32 mc2[32], mc3[32], mc4[32], mc5[32];
00028 
00029         void Init();
00030         void Tailor(unsigned int FPTLEN);
00031         void HashEndianCorrectedBlock(const word32 *in);
00032 
00033         const unsigned int digestSize, pass;
00034 };
00035 
00036 /// <a href="http://www.weidai.com/scan-mirror/md.html#HAVAL">HAVAL</a> with 3 passes
00037 class HAVAL3 : public HAVAL
00038 {
00039 public:
00040         HAVAL3(unsigned int digestSize=DIGESTSIZE) : HAVAL(digestSize, 3) {}
00041         static void Transform(word32 *buf, const word32 *in);
00042 };
00043 
00044 /// <a href="http://www.weidai.com/scan-mirror/md.html#HAVAL">HAVAL</a> with 4 passes
00045 class HAVAL4 : public HAVAL
00046 {
00047 public:
00048         HAVAL4(unsigned int digestSize=DIGESTSIZE) : HAVAL(digestSize, 4) {}
00049         static void Transform(word32 *buf, const word32 *in);
00050 };
00051 
00052 /// <a href="http://www.weidai.com/scan-mirror/md.html#HAVAL">HAVAL</a> with 5 passes
00053 class HAVAL5 : public HAVAL
00054 {
00055 public:
00056         HAVAL5(unsigned int digestSize=DIGESTSIZE) : HAVAL(digestSize, 5) {}
00057         static void Transform(word32 *buf, const word32 *in);
00058 };
00059 
00060 NAMESPACE_END
00061 
00062 #endif

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