The TLSSNI01ChallengeCert and TLSSNI02ChallengeCert functions have been marked deprecated since 2022. The package documentation indicates pre-RFC 8555 functionality is retained for compilation success, but will return errors. This commit makes these two deprecated functions match that description. No meaningful support for these draft standard challenge types exists in the ACME ecosystem, and they are insecure for use in shared hosting environments. Change-Id: I1c17980a0630092c70eb971b3453a0f115834be0 Reviewed-on: https://go-review.googlesource.com/c/crypto/+/676835 Auto-Submit: 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> Reviewed-by: Michael Knyszek <mknyszek@google.com>