Re: [quicwg/base-drafts] Rewrite key update section (#3050)

[Martin Thomson <[e-mail]>]

martinthomson commented on this pull request.



> +An endpoint SHOULD retain old keys so that packets sent by its peer prior to
+receiving the key update can be processed.  Discarding old keys too early can
+cause delayed packets to be discarded.  Discarding packets will be interpreted
+as packet loss by the peer and could adversely affect performance.
+
+
+## Responding to a Key Update
+
+A peer is permitted to initiate a key update after receiving an acknowledgement
+of a packet in the current key phase.  If a packet is received with a key phase
+that differs from the value the endpoint used to protect the last packet it
+sent, the endpoint uses the next packet protection keys for reading and the
+corresponding key and IV; see {{receive-key-generation}} for considerations
+about generating these keys.
+
+An endpoint uses the same key derivation process as its peer uses to generate

I cut it.  It isn't necessary.

The point was to say that you need to generate the same keys for reading that your peer uses for writing.  But it was full of fail.

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