CryptContext.h

Go to the documentation of this file.

/*  CryptContext.h - cryptoAPI context 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_CryptContext_h
#define OW32_CryptContext_h

#include <OW32/XHCRYPTPROV.h>

namespace OW32
{

class OW32_LIB_EXPORT CCryptContext
{
    XHCRYPTPROV m_hCryptProv;

    CCryptContext(const CCryptContext& );
    CCryptContext operator=(const CCryptContext& );

public:
    CCryptContext() {}

    CCryptContext(HCRYPTPROV hCryptProv) {
        m_hCryptProv = hCryptProv;
    }

    operator HCRYPTPROV() { return m_hCryptProv; }

    BOOL AcquireContext(LPCTSTR ContainerName = NULL, LPCTSTR ProviderName = NULL,
        DWORD ProvType = PROV_RSA_FULL, DWORD dwFlags = 0)
    {
        m_hCryptProv.Close();
        return CryptAcquireContext(&m_hCryptProv, ContainerName, ProviderName,
            ProvType, dwFlags);
    }

    BOOL AcquireContextWithCreate(LPCTSTR ContainerName = NULL, LPCTSTR ProviderName = NULL,
        DWORD ProvType = PROV_RSA_FULL, DWORD dwFlags = 0)
    {
        if (AcquireContext(ContainerName, ProviderName, ProvType, dwFlags))
            return TRUE;
        // failed to acquire the container, create a new one
        return AcquireContext(ContainerName, ProviderName, ProvType, dwFlags|CRYPT_NEWKEYSET);
    }

    BOOL GetProvParam(DWORD dwParam, BYTE* pbData, DWORD* cbData, DWORD Flags = 0)
    {
        return CryptGetProvParam(m_hCryptProv, dwParam, pbData, cbData, Flags);
    }

    BOOL GetUserKey(DWORD KeySpec, HCRYPTKEY* phKey)
    {
        return CryptGetUserKey(m_hCryptProv, KeySpec, phKey);
    }

    BOOL GenKey(ALG_ID AlgId, HCRYPTKEY* phKey, DWORD Flags = 0)
    {
        return CryptGenKey(m_hCryptProv, AlgId, Flags, phKey);
    }

    BOOL GenRandom(DWORD dwLen, BYTE *pbBuffer)
    {
        return CryptGenRandom(m_hCryptProv, dwLen, pbBuffer);
    }

    BOOL ImportKey(BYTE* pbData, DWORD dwDataLen, HCRYPTKEY* phKey, HCRYPTKEY hPubKey = NULL, DWORD dwFlags = 0)
    {
        return CryptImportKey(m_hCryptProv, pbData, dwDataLen, hPubKey, dwFlags, phKey);
    }
};

} // namespace OW32

#endif // OW32_CryptContext_h

---