[DllImport("Crypt32.dll", SetLastError = true)]
public static extern bool CryptSignMessage(
ref CRYPT_SIGN_MESSAGE_PARA pSignPara,
bool fDetachedSignature,
uint cToBeSigned,
IntPtr[] rgpbToBeSigned,
uint[] rgcbToBeSigned,
IntPtr pbSignedBlob,
ref uint pcbSignedBlob
);