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XHCRYPTHASH.h

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00001 /*  XHCRYPTHASH.h - cryptographic hash handle wrapper
00002     Copyright (C) 2001-2004 Mark Weaver
00003     Written by Mark Weaver <mark@npsl.co.uk>
00004 
00005     Part of the Open-Win32 library.
00006     This library is free software; you can redistribute it and/or
00007     modify it under the terms of the GNU Library General Public
00008     License as published by the Free Software Foundation; either
00009     version 2 of the License, or (at your option) any later version.
00010 
00011     This library is distributed in the hope that it will be useful,
00012     but WITHOUT ANY WARRANTY; without even the implied warranty of
00013     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014     Library General Public License for more details.
00015 
00016     You should have received a copy of the GNU Library General Public
00017     License along with this library; if not, write to the
00018     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
00019     Boston, MA  02111-1307, USA.
00020 */
00021 
00026 #ifndef OW32_XHCRYPTHASH_H
00027 #define OW32_XHCRYPTHASH_H
00028 
00029 #include <OW32/OW32Libs.h>
00030 #include <OW32/windows.h>
00031 
00032 namespace OW32 
00033 {
00034 
00036 class OW32_LIB_EXPORT XHCRYPTHASH 
00037 {
00038 private:
00039    HCRYPTHASH m_hHash;
00040 
00041    XHCRYPTHASH(const XHCRYPTHASH& );
00042    XHCRYPTHASH& operator=(const XHCRYPTHASH& );
00043 
00044 public:
00046     XHCRYPTHASH() : m_hHash(NULL) {} 
00047 
00049     XHCRYPTHASH(HCRYPTHASH h) : m_hHash(h) { }
00050 
00052     ~XHCRYPTHASH() {
00053         Close();
00054     }
00055 
00057     void Close() {
00058         if (m_hHash != NULL) {
00059             CryptDestroyHash(m_hHash);
00060             m_hHash = NULL;
00061         }
00062     }
00063 
00065     operator HCRYPTHASH() const { return m_hHash; }
00066 
00068     HCRYPTHASH* operator&() { return &m_hHash; }
00069 
00071     HCRYPTHASH operator=(HCRYPTHASH h) { Close(); m_hHash = h; return m_hHash; }
00072     
00074     HCRYPTKEY Detach() { HCRYPTHASH h=m_hHash; m_hHash=0; return h; }
00075 };
00076 
00077 } // namespace OW32
00078 
00079 #endif // OW32_XHCRYPTHASH_H

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