Maybe; but handing a MAC to generalist developers is going to end in a timing attack, like http://rdist.root.org/2009/05/28/timing-attack-in-google-keyczar-libr

Maybe; but handing a MAC to generalist developers is going to end in a timing attack, like http://rdist.root.org/2009/05/28/timing-attack-in-google-keyczar-library/ http://rdist.root.org/2009/05/28/timing-attack-in-google-key.... (And Keyczar is not amateur hour!)