The second ClientHello after HelloRetryRequest reuses the HPKE context
and calls Seal/Open a second time. To avoid needing to unnecessarily
retain the enc value, and discourage servers from mistakenly recreating
the HPKE context, we made it use the empty string but forgot to update
the syntax to match.
The second ClientHello after HelloRetryRequest reuses the HPKE context and calls Seal/Open a second time. To avoid needing to unnecessarily retain the enc value, and discourage servers from mistakenly recreating the HPKE context, we made it use the empty string but forgot to update the syntax to match.