Prior to Go 1.4, crypto didn't have the consts defined for SHA-3. LGTM=bradfitz R=bradfitz CC=golang-codereviews https://golang.org/cl/133540043
Prior to Go 1.4, crypto didn't have the consts defined for SHA-3. LGTM=bradfitz R=bradfitz CC=golang-codereviews https://golang.org/cl/133540043