cpipehmac_sha1.h

研读AxCrypt对加解密的处理方法

#pragma once
/*! \file
    \brief Declaration of AxPipe::Stock::CPipeHMAC_SHA1, calculate HMAC_SHA1 of the stream

    @(#) $Id: CPipeHMAC_SHA1.h,v 1.1.1.1 2003/12/17 21:36:58 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>
#include "TBits.h"
#include "CPipeSHA1.h"

namespace AxPipe {
    namespace Stock {
        /// \brief Calculate HMAC-SHA1-128 or 160 from a data-stream
        ///
        /// Define the bitlength in the template instantiation.
        template <int iBits> class CPipeHMAC_SHA1 : public CPipeSHA1 {
            TBits<160> m_HMAC;              ///< HMAC intermediate
            TBits<iBits> m_Key;             ///< The key provied in Init()
            size_t m_cbOffset;              ///< Offset from where to start HMAC'ing.
            void XorPad(unsigned char oPad);///< Helper for the inner and outer padding and Xor
        protected:
            void Out(CSeg *pSeg);           ///< Hash and pass onwards
            bool OutOpen();                 ///< Do the inner wrap
            bool OutClose();                ///< Do the outer wrap
        public:
            /// \brief Initialize the key and possibly an offset when to start HMAC'ing
            CPipeHMAC_SHA1<iBits> *Init(TBits<iBits> *pKey, size_t cbOffset = 0);
        };
    }
}