Folks,
https://github.com/tlswg/tls13-spec/issues/278
The additional data field presently includes the version:
additional_data = seq_num + TLSPlaintext.record_version
However, TLSPlaintext.record_version is now always {3, 1}, so
this is redundant. There seem to be two primary options here:
1. Don't MAC the version at all.
2. MAC the negotiated version (which should be clear at
this point).
I could go either way on this (slightly leaning towards #2) but
the current thing seems silly.
-Ekr
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