Change:
Note: There's a consistency issue around Derive-Secret, for which I filed for follow-up.
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On the one hand... On the other hand... We probably want Derive-Secret to have a third argument for the GroupContext, or define that Derive-Secret always takes the current group context.
I would much prefer to go back to the TLS definition, we don't need the thing at all, this is an implementation artifact... Definition we use for TLS and the symbolic proof in the formal model:
Ps: because is quite long in MLS, we directly pass to instead.
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Discussion:
where "encode_big_endian()" encodes the generation in a big-endian integer of the same size as the base handshake nonce. <ins> 6.9. The main MLS key schedule provides an "exporter_secret" which can be used by an application as the basis to derive new secrets called "exported_value" outside the MLS layer. The context used for the derivation of the "exported_value" MAY be empty while each application SHOULD provide a unique label as an input of the HKDF-Expand-Label for each use case.  This is to prevent two exported outputs from being generated with the same values and used for different functionalities. The exported values are bound to the Group epoch from which the "exporter_secret" is derived, hence reflects a particular state of the Group. It is RECOMMENDED for the application generating exported values to refresh those values after a group operation is processed. </ins> 7. In order to facilitate asynchronous addition of clients to a group,