A hash object needs to be cloned when doing certain steps in a
TLS 1.3 server handshake. It is more efficient to use the
hash.Cloner interface to clone a hash than to encode and decode
the hash object using the binary encoding interfaces.
We still need to support the binary encoding path in case the
hash objects come from the fips140 v1.0.0 module, given that
this module doesn't support the hash.Cloner interface.
Change-Id: I8425e14e481dcefafc9aa1e5bfd63b61c22675ad
Reviewed-on: https://go-review.googlesource.com/c/go/+/682597 Reviewed-by: Damien Neil <dneil@google.com> Reviewed-by: Roland Shoemaker <roland@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>