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/* hash.hpp
*
* Copyright (C) 2003 Sawtooth Consulting Ltd.
*
* This file is part of yaSSL.
*
* yaSSL is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* There are special exceptions to the terms and conditions of the GPL as it
* is applied to yaSSL. View the full text of the exception in the file
* FLOSS-EXCEPTIONS in the directory of this software distribution.
*
* yaSSL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
/* hash.hpp provides a base for digest types
*/
#ifndef TAO_CRYPT_HASH_HPP
#define TAO_CRYPT_HASH_HPP
#include "misc.hpp"
namespace TaoCrypt {
// HASH
class HASH : public virtual_base {
public:
virtual ~HASH() {}
virtual void Update(const byte*, word32) = 0;
virtual void Final(byte*) = 0;
virtual void Init() = 0;
virtual word32 getBlockSize() const = 0;
virtual word32 getDigestSize() const = 0;
};
// HASH with Transform
class HASHwithTransform : public HASH {
public:
HASHwithTransform(word32 digSz, word32 buffSz);
virtual ~HASHwithTransform() {}
virtual ByteOrder getByteOrder() const = 0;
virtual word32 getPadSize() const = 0;
virtual void Update(const byte*, word32);
virtual void Final(byte*);
word32 GetBitCountLo() const { return loLen_ << 3; }
word32 GetBitCountHi() const { return (loLen_ >> (8*sizeof(loLen_) - 3)) +
(hiLen_ << 3); }
enum { MaxDigestSz = 5, MaxBufferSz = 64 };
protected:
typedef word32 HashLengthType;
word32 buffLen_; // in bytes
HashLengthType loLen_; // length in bytes
HashLengthType hiLen_; // length in bytes
word32 digest_[MaxDigestSz];
word32 buffer_[MaxBufferSz / sizeof(word32)];
virtual void Transform() = 0;
void AddLength(word32);
};
} // namespace
#endif // TAO_CRYPT_HASH_HPP
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