Fixes golang/go#57107. Change-Id: I20b1f6ca85170c6b4731d7c7ea06f4db742526cc Reviewed-on: https://go-review.googlesource.com/c/crypto/+/456123 TryBot-Result: Gopher Robot <gobot@golang.org> Run-TryBot: Bryan Mills <bcmills@google.com> Reviewed-by: Roland Shoemaker <roland@golang.org> Auto-Submit: Bryan Mills <bcmills@google.com>