Forbid the sender from sending duplicate supported groups entries. #1354
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This seems reasonable, but it's a normative change, so the chairs need to tell us how to proceed. |
martinthomson
suggested changes
Apr 16, 2024
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@seanturner @jsalowey @dconnolly do the chairs want to entertain this? |
Co-authored-by: Martin Thomson <mt@lowentropy.net>
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Supported Groups is intimately tied to Key Share, where Key Share must be sent in the preference order specified by Supported Groups.
Duplicate Key Shares for a group are already forbidden from being sent, but allowing duplicates in Supported Groups makes this a bit muddled if supported groups is permitted to be, for example, ABA and the client sends key share B then A.
Now, nothing sane should actually be sending duplicate supported groups in a preference order, but it's still not forbidden to do so today. I'm suggesting we just not allow this so server side implementations can reject attempts to do so.