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This required adding a new field to SessionState for TLS 1.0–1.2, since the key exchange is not repeated on resumption. The additional field is unfortunately not backwards compatible because current Go versions check that the encoding has no extra data at the end, but will cause cross-version tickets to be ignored. Relaxed that so we can add fields in a backwards compatible way the next time. For the cipher suite, we check that the session's is still acceptable per the Config. That would arguably make sense here, too: if a Config for example requires PQ, we should reject resumptions of connections that didn't use PQ. However, that only applies to pre-TLS 1.3 connections, since in TLS 1.3 we always do a fresh key exchange on resumption. Since PQ is the only main differentiator between key exchanges (aside from off-by-default non-PFS RSA, which are controlled by the cipher suite in TLS 1.0–1.2) and it's PQ-only, we can skip that check. Fixes #67516 Change-Id: I6a6a465681a6292edf66c7b8df8f4aba4171a76b Reviewed-on: https://go-review.googlesource.com/c/go/+/653315 Reviewed-by: David Chase <drchase@google.com> Auto-Submit: Filippo Valsorda <filippo@golang.org> Reviewed-by: Daniel McCarney <daniel@binaryparadox.net> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Roland Shoemaker <roland@golang.org>
Files in this directory are data for Go's API checker ("go tool api", in src/cmd/api).
Each file is a list of API features, one per line.
go1.txt (and similarly named files) are frozen once a version has been
shipped. Each file adds new lines but does not remove any.
except.txt lists features that may disappear without breaking true
compatibility.
Starting with go1.19.txt, each API feature line must end in "#nnnnn"
giving the GitHub issue number of the proposal issue that accepted
the new API. This helps with our end-of-cycle audit of new APIs.
The same requirement applies to next/* (described below), which will
become a go1.XX.txt for XX >= 19.
The next/ directory contains the only files intended to be mutated.
Each file in that directory contains a list of features that may be added
to the next release of Go. The files in this directory only affect the
warning output from the go api tool. Each file should be named
nnnnn.txt, after the issue number for the accepted proposal.
(The #nnnnn suffix must also appear at the end of each line in the file;
that will be preserved when next/*.txt is concatenated into go1.XX.txt.)
When you add a file to the api/next directory, you must add at least one file
under doc/next. See doc/README.md for details.