XHCRYPTHASH.h

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/*  XHCRYPTHASH.h - cryptographic hash handle wrapper
    Copyright (C) 2001-2004 Mark Weaver
    Written by Mark Weaver <mark@npsl.co.uk>

    Part of the Open-Win32 library.
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the
    Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA  02111-1307, USA.
*/

#ifndef OW32_XHCRYPTHASH_H
#define OW32_XHCRYPTHASH_H

#include <OW32/OW32Libs.h>
#include <OW32/windows.h>

namespace OW32 
{

class OW32_LIB_EXPORT XHCRYPTHASH 
{
private:
   HCRYPTHASH m_hHash;

   XHCRYPTHASH(const XHCRYPTHASH& );
   XHCRYPTHASH& operator=(const XHCRYPTHASH& );

public:
    XHCRYPTHASH() : m_hHash(NULL) {} 

    XHCRYPTHASH(HCRYPTHASH h) : m_hHash(h) { }

    ~XHCRYPTHASH() {
        Close();
    }

    void Close() {
        if (m_hHash != NULL) {
            CryptDestroyHash(m_hHash);
            m_hHash = NULL;
        }
    }

    operator HCRYPTHASH() const { return m_hHash; }

    HCRYPTHASH* operator&() { return &m_hHash; }

    HCRYPTHASH operator=(HCRYPTHASH h) { Close(); m_hHash = h; return m_hHash; }
    
    HCRYPTKEY Detach() { HCRYPTHASH h=m_hHash; m_hHash=0; return h; }
};

} // namespace OW32

#endif // OW32_XHCRYPTHASH_H

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