tree 084dfc2c4854fa2fd4b378a496c935a35abb162e
parent 5b202a94f0ef30421c532b2aed963ac9f6f78521
author Bill Richardson <wfrichar@chromium.org> 1443117581 -0700
committer chrome-bot <chrome-bot@chromium.org> 1443202284 -0700

futility: Add show capability for usbpd1 images

The firmware for the USB Type-C power adapters uses raw binary
blobs for the public keys and signatures instead of
readily-identifiable structs. We've been able to sign these
firmware images for some time, but verifying the result generally
required testing them on hardware.

This CL adds some futilty support for recognizing and verifying
those images too. It just tries various sig and hash algorithms,
until it finds a combination for which the image is
self-consistent (where the pubkey blob verifies the signature
blob).

BUG=none
BRANCH=none
TEST=make runtests

This change also adds additional tests for usbpd1 images. We
ensure that we correctly recognize and verify an MP-signed
firmware, plus test signing and verifying usbpd1 images using
multiple signature and hash algorithms.

Change-Id: I4fbe8b37a694992f635d5469ae1c2449b1610dfd
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/302415
Reviewed-by: Randall Spangler <rspangler@chromium.org>