tree 0993333ac5cdeb0e06e3ed37f3bd56b87c0eb6e3
parent 74475bfd0ed945d9035c1760c6ccf938f4f0cdff
author Jay Srinivasan <jaysri@chromium.org> 1347932916 -0700
committer Gerrit <chrome-bot@google.com> 1347944571 -0700

Generate and validate per-operation hashes

As part of securing the HTTP-based updates, we want to add a SHA256 hash
of the data blob for each operation so that they can't be tampered with
by a man in the middle. This CL adds support for generating and
including such hashes for each operation in the payload as well as
validating them in update_engine, if present.

BUG=chromium-os:34298
TEST=Tested on ZGB to make sure existing functionality works fine.
     Existing unit tests cover all the new code paths.
Change-Id: Ie42ed1930a66ceaf183f36ce3af0dea719e44237
Reviewed-on: https://gerrit.chromium.org/gerrit/33389
Reviewed-by: Don Garrett <dgarrett@chromium.org>
Commit-Ready: Jay Srinivasan <jaysri@chromium.org>
Tested-by: Jay Srinivasan <jaysri@chromium.org>