CryptHash.h

Go to the documentation of this file.

/*  CryptHash.h - cryto API hash 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_CryptHash_h
#define OW32_CryptHash_h

#include <OW32/XHCRYPTHASH.h>

namespace OW32 {

class OW32_LIB_EXPORT CCryptHash
{
    XHCRYPTHASH m_hCryptHash;

    CCryptHash(const CCryptHash& cryptHash);
    CCryptHash operator=(const CCryptHash& cryptHash);

public:
    CCryptHash() {}

    void Destroy()
    {
        m_hCryptHash.Close();
    }

    BOOL Create(HCRYPTPROV hProv, ALG_ID algId,
        HCRYPTKEY hKey = NULL, DWORD dwFlags = 0)
    {
        Destroy();
        return CryptCreateHash(hProv, algId, hKey, dwFlags, &m_hCryptHash);
    }

    BOOL Hash(const void* pbData, DWORD dwDataLen, DWORD dwFlags = 0)
    {
        return CryptHashData(m_hCryptHash, (const BYTE*)pbData, dwDataLen, dwFlags);
    }

    BOOL GetParam(DWORD dwParam, BYTE* pbData, DWORD* pdwDataLen, 
        DWORD dwFlags=0)
    {
        return CryptGetHashParam(m_hCryptHash, dwParam, pbData, 
            pdwDataLen, dwFlags);
    }

    BOOL GetSize(DWORD* pdwSize)
    {
        DWORD dwDataLen = sizeof(DWORD);
        return GetParam(HP_HASHSIZE, (BYTE*)pdwSize, &dwDataLen);
    }

    BOOL GetValue(PBYTE pbData, DWORD* pdwDataLen)
    {
        return GetParam(HP_HASHVAL, pbData, pdwDataLen);
    }

    BOOL GetAlgId(ALG_ID* pAlgId)
    {
        DWORD dwDataLen = sizeof(ALG_ID);
        return GetParam(HP_ALGID, (PBYTE)pAlgId, &dwDataLen);
    }

    operator HCRYPTHASH () const { return m_hCryptHash; }
};

} // namespace OW32

#endif // OW32_CryptHash_h

---