fix del_key function

Signed-off-by: riankashyap <riankashyap@gmail.com>
add asymmetric_encrypt function

Signed-off-by: riankashyap <riankashyap@gmail.com>
add gnupg wrapper

Signed-off-by: riankashyap <riankashyap@gmail.com>
add asymmetric_decrypt function

Signed-off-by: riankashyap <riankashyap@gmail.com>