gordon chung f75a050910 minimise the use of hmac
- computing a signature from hmac requires significant overhead.
don't compute it for each pipeline.
- also adds in missing support to verify signature at pipeline.

Change-Id: Idfec6dfb645d581f6bc55264a042f6792c26df75
Partial-Bug: #1436077
2015-03-25 14:26:27 -04:00
..
2015-03-25 14:26:27 -04:00