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e1867d26a1
With newer PD chips and different update mechanisms, we can no longer guarantee that the "hash" (really just a sort of version identifier) of an EC-RW image will always be a SHA256. This patch removes any hardcoded assumptions about that from vboot, and instead accepts any hash size returned by VbExEcHashImage() and VbExEcGetExpectedImageHash(). It also removes the assumption that the hash can be regenerated by running SHA256 over the full image returned by VbExEcGetExpectedImage(). We can thus no longer support VBERROR_EC_GET_EXPECTED_HASH_FROM_IMAGE, which is fine since that functionality hasn't been needed for years and there would be no reason why we might need it in the future. This also allows simplifying the code flow of EcUpdateImage() a bit (since you can really just return very early if you already figured out that you don't need to update). BRANCH=None BUG=chrome-os-partner:53780 TEST=Tested software sync on Oak both after cold and warm boot. Change-Id: I498f3d39085a38740734fff9f2d1a186a0801489 Signed-off-by: Julius Werner <jwerner@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/348001 Reviewed-by: Randall Spangler <rspangler@chromium.org>