Swiften/Base/WindowsRegistry.h

/*
 * Copyright (c) 2012 Kevin Smith
 * Licensed under the GNU General Public License v3.
 * See Documentation/Licenses/GPLv3.txt for more information.
 */

#pragma once

#include <windows.h>

namespace Swift {
  class WindowsRegistry {
    public:
      static bool isFIPSEnabled() {
        char* pathForXP = "System\\CurrentControlSet\\Control\\Lsa";
        char* pathSinceVista = "System\\CurrentControlSet\\Control\\Lsa\\FIPSAlgorithmPolicy";
        char* keyForXP = "FIPSAlgorithmPolicy";
        char* keySinceVista = "Enabled";

        OSVERSIONINFO osvi;
        ZeroMemory(&osvi, sizeof(OSVERSIONINFO));
        osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
        GetVersionEx(&osvi);

        char* keyForOS = osvi.dwMajorVersion < 6 ? keyForXP : keySinceVista;
        char* pathForOS = osvi.dwMajorVersion < 6 ? pathForXP : pathSinceVista;

        /* http://support.microsoft.com/kb/811833 */
        /* http://msdn.microsoft.com/en-us/library/ms724911%28VS.85%29.aspx */
        HKEY key;
        bool result = false;
        if (RegOpenKeyEx(HKEY_LOCAL_MACHINE,
              pathForOS,
              0,
              KEY_READ,
              &key) != ERROR_SUCCESS) {
          /* If we can't find the key that says we're FIPS, we're not FIPS */
          return result;
        }
        DWORD keyType = REG_DWORD;
        DWORD data;
        DWORD length = sizeof(data);

        if (RegQueryValueEx(key,
            keyForOS,
            NULL,
            &keyType,
            (LPBYTE)&data,
            &length) == ERROR_SUCCESS) {
          result = data != 0;
        }

        RegCloseKey(key);
        return result;
      }
  };
}