This reverts commit bf88e3f4ba.
Reason for revert: https://go-review.googlesource.com/c/crypto/+/105876/12#message-0dad31af2b487e895ee6926ded82f85ac81c74f8
Updates golang/go#14015
Change-Id: I8eb3ed73f78ac11841ad73435bba00a330d59b58
Reviewed-on: https://go-review.googlesource.com/c/160257
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>