We used to compute the incorrect value if len(initBlock) % rate == 0. Also, add a test vector for golang/go#66232, confirmed to fail on GOARCH=386 without CL 570876. Fixes golang/go#69169 Change-Id: I3f2400926fca111dd0ca1327d6b5975e51b28f96 Reviewed-on: https://go-review.googlesource.com/c/crypto/+/616576 Reviewed-by: Andrew Ekstedt <andrew.ekstedt@gmail.com> Reviewed-by: Daniel McCarney <daniel@binaryparadox.net> Reviewed-by: Michael Pratt <mpratt@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Auto-Submit: Filippo Valsorda <filippo@golang.org> Reviewed-by: Roland Shoemaker <roland@golang.org>