The surviving Hittite Laws tablets do not name an author or promulgating authority. Some historians infer the source was someone of high rank in Hittite society, possibly a king, but this is scholarly inference rather than an attested statement in the text itself.
What would resolve this A Hittite royal inscription, colophon, or independent Hittitological source naming the specific king or court that issued the laws would resolve this; absent that, the promulgator may simply be unrecoverable from the surviving record.
OpenHittitology / Ancient Near Eastern StudiesHittite Laws (Wikipedia)