/ray/src/lib/crypto/crc32hash.h

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/*
 * lib/crypto/crc32hash.h
 * 
 * Header file containing class CRC321Hash, a class for computation of 
 * the CRC32 checksum (POSIX.2) which is not a cryptographically secure 
 * hash algorithm. 
 * 
 * Copyright (c) 2004 by Wolfgang Wieser ] wwieser (a) gmx <*> de [ 
 * 
 * This file may be distributed and/or modified under the terms of the 
 * GNU General Public License version 2 as published by the Free Software 
 * Foundation. (See COPYING.GPL for details.)
 * 
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 * 
 */

#ifndef _LIB_CRYPTO_CRC32Hash_H_
#define _LIB_CRYPTO_CRC32Hash_H_ 1

#include <lib/crypto/shashbase.h>

class CRC32Hash : public SecureHashBase
{
    public:
        static const Parameters par;
        
    private:
        uint32 state;  
        //uint64 length; <- in base class // length of hashed data in BYTES. 
        
        static const uint32 crc32table[256];
        
        CRC32Hash(const CRC32Hash &);
        void operator=(const CRC32Hash &);
    public:
        CRC32Hash() : SecureHashBase()
            {  reset();  }
        ~CRC32Hash()
            {  reset();  }
        
        const Parameters *GetPar() const
            {  return(&CRC32Hash::par);  }
        
        uint64 FedBytes() const
            {  return(length);  }
        
        void reset();
        
        void feed(const char *buf,size_t len);
        
        void final();
        
        void GetHash(char *buf) const;
};

#endif  /* _LIB_CRYPTO_CRC32Hash_H_ */

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