private static extern bool CryptGetProvParam(ProvHandle hProv, int dwParam, IntPtr pbData, ref int pdwDataLen, int dwFlags);
private static extern bool CryptGetProvParam(ProvHandle hProv, int dwParam, IntPtr pbData, ref int pdwDataLen, int dwFlags);
private static extern bool CryptAcquireContext(out ProvHandle phProv, string pszContainer, string pszProvider, int dwProvType, int dwFlags);
private static extern bool CryptAcquireContext(out ProvHandle phProv, string pszContainer, string pszProvider, int dwProvType, int dwFlags);