David Zeuthen a8e8b659d0 Add Confirmation API.
This CL adds new Framework APIs that can be used for the secure
confirmations. This includes support for configuring a key such that
it can only sign data returned by the confirmation APIs.

Bug: 63928580
Test: Manually tested.
Change-Id: I94c1fc532376bd555b3dc37fc4709469450cfde6
2018-01-30 17:33:21 -05:00
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