The grammar for the label permits the label to be 9 octets long. That's the exact length of the prefix.
That means that it is valid to use an exporter with an empty label string. That seems dangerous. I propose that we require at least one octet: https://github.com/tlswg/tls13-spec/pull/774 _______________________________________________ TLS mailing list TLS@ietf.org https://www.ietf.org/mailman/listinfo/tls
