Draft: draft-ietf-mls-protocol

Commentary: This is for injection of out - of - band shared entropy . 
 Note that an alternative to this is to make PSK a proposal containing a PSK identifier . 
 I forgot to push my last commit when merging there should be a non - empty context for within the just after the PSK . Fix this when doing step 2 to keep close to the TLS importer ... 
 Think this is obsolete given recent revisions to Derive - Secret 
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Paragraph (version B):
Groups which already have an out-of-band mechanism to generate shared
group secrets can inject those in the MLS key schedule to seed the
MLS group secrets computations by this external entropy.
Paragraph (version B):
At any epoch, including the initial state, an application can decide
to synchronize the injection of a PSK in the MLS key schedule.
Paragraph (version B):
This mechanism can be used to improve security in the cases where
having a full run of updates accross members is too expensive or in
the case where the external group key establishment mechanism
provides stronger security against classical or quantum adversaries.
Paragraph (version B):
The security level associated to the PSK injected in the key schedule
SHOULD match at least the security level of the ciphersuite in use in
the group.
Paragraph (version B):
Note that, as a PSK may have a different lifetime than an update, it
does not necessarily provide the same FS or PCS guarantees than a
Commit message.