tbits.h

研读AxCrypt对加解密的处理方法

#pragma once
/*! \file
    \brief Declaration of AxPipe::Stock::THash and AxPipe::Stock::TKey, template classes for such

    @(#) $Id: TBits.h,v 1.1.1.1 2003/12/17 21:37:01 svante Exp $

    AxPipe - Binary Stream Framework

    Copyright (C) 2003 Svante Seleborg/Axon Data, All rights reserved.

    This program 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.

    This program 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

    The author may be reached at mailto:[e-mail] and http://axpipe.sourceforge.net

    Why is this framework released as GPL and not LGPL?
    See http://www.gnu.org/philosophy/why-not-lgpl.html

----
\verbatim
    E-mail                          YYYY-MM-DD              Reason
    [e-mail]              2003-12-15              Initial
\endverbatim
*/
#include <wincrypt.h>

namespace AxPipe {
    namespace Stock {
        /// \brief A template class for hashes of various kinds.
        ///
        /// Encapsulate common properities of hashes, mostly just for notational
        /// convenience.
        template <int iBits> class TBits {
            unsigned char m_Bits[iBits/8];  ///< The bits. Yes, I know a char needn't be 8 bits
        public:
            TBits();                        ///< Construct zero-initialized
            TBits(unsigned char *bpInit,
                      int cb);              ///< Byte-string initialized
            void *GetLeft(const int n);     ///< Get the n left-most bits (most significant)
            void *GetRight(const int n);    ///< Get the n right-most bits (least significant)

            TBits& operator+=(const TBits& rhs);    ///< Do long addition of two bit blocks.
            TBits& operator^=(const TBits& rhs);    ///< Do long xor of two bit blocks.
            TBits& operator=(const TBits& rhs);     ///< Assign one to another
        };
    }
}