BASE64_MIME.encode(&self.public_key_bytes())

        let mut s = BASE64_MIME.encode(&self.public_key_bytes());
        assert_eq!(s.pop(), Some('\n'));
        assert_eq!(s.pop(), Some('\r'));
        s

    let name = publickey.name().as_bytes();
    w.write_all(name)?;
    w.write_all(b" ")?;
    w.write_all(publickey.public_key_base64().as_bytes())?;

    let pk = publickey.public_key_base64();
    writeln!(w, "{} {}", publickey.name(), pk)?;

    file.seek(SeekFrom::Start(0))?;

    file.seek(SeekFrom::End(0))?;

    debug!("host_port = {:?}", host_port);