commit 21ce2c5b1eefb6ab755a3b81ff159da4e381ea99
author Jiyong Park <jiyong@google.com> Sat Aug 28 02:32:17 2021 +0900
committer Jiyong Park <jiyong@google.com> Wed Sep 01 01:58:22 2021 +0900
tree 465079793c30bdeae86e432f6faa5f286b5d34a5
parent c5dad8a818c09a7d3428b49f573cc7211377e1e4

Store apk root hash to the instance disk

The instance disk has been created, but hasn't actually been used. This
CL is the first step towards actually using it. Specifically, this CL

* provides routines for navigating the instance disk. The disk consists
of a disk header, followed by partitions each of which consists of a
header and payload. Each partition is dedicated to a program loader like
pVM firmware, Android Boot Loader, and microdroid_manager. A partition
is identified by UUID and this CL provides a routine to locate the
partition for a given UUID.

* provides routines for reading and writing on payload in a partition.
The data is stored encrypted when it is written and is decrypted when
read. The key is currently hard-coded but, it will eventually be derived
from the sealing CDI from the previous stage.

* Root hash of an apk extracted from the idsig file is stored to the
disk. Note that the stored root hash is not yet used by apkdmverity. It
shall be done in a follow-up change.

Bug: 193504400
Test: boot microdroid twice. check that the root hash is written to the
disk during the first boot, and then read during the second boot. Also
check that the two root hashes are the same.

Change-Id: Ia1afcda4d8444ad52a47ebcc659b2698159da816