am ccada9ab: am 6f1d0d13: am 174da4e3: am e8ce2144: am f7592b23: Merge "HMAC keys are authorized for exactly one digest." into mnc-dev

* commit 'ccada9abada9f77971f9dea5cdccba6a0fd23e7d':
  HMAC keys are authorized for exactly one digest.