Fixes golang/go#53481. Change-Id: Ic00eef498d1d3b5b0ca5c9c526fac7c26de30cf2 Reviewed-on: https://go-review.googlesource.com/c/crypto/+/421014 TryBot-Result: Gopher Robot <gobot@golang.org> Auto-Submit: Filippo Valsorda <filippo@golang.org> Run-TryBot: hopehook <hopehook@qq.com> Reviewed-by: Damien Neil <dneil@google.com> Reviewed-by: Roland Shoemaker <roland@golang.org>