Chris Sosa 8dad50d97f Update test harness to take in optional public and private keys to sign payloads.
In addition some refactoring to make this cleaner and easier.

Change-Id: I1607700d065c71aff2b2833b10acbd3ebace68ce

BUG=chromium-os:8212
TEST=Ran with Simple ... running now with full

Review URL: http://codereview.chromium.org/6482017
2011-02-14 15:29:32 -08:00
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