On-device signing binary.
This is a first version of the on-device signing binary, that will be
used to sign ART compilation artifacts on an ART mainline module update.
The following basic functionality is implemented:
1) Creating a signing key (though not an early-boot key yet, because
those are broken on cuttlefish)
2) Creating an X.509 certificate from that key
3) Adding said certificate to the fs-verity keychain
4) Verify existing artifacts are in fs-verity (and delete them if
they're not)
5) Call odrefresh --check to have ART verify the artifacts are fresh and
correct
6) Call odrefresh --compile if they're not
7) Add generated output files to fs-verity
Important things left to do (not an exhaustive list):
1) Verify the key characteristics (eg, early-boot key)
2) Add a "manifest" file that records the signed files and their root
hashes; this will prevent us from accepting any random fs-verity file
3) Add a property or other signal to tell Zygote "we think these
artifacts are safe to use"
4) Migrate to keystore2 (once available)
Bug: 165630556
Test: Run odsign as root
Change-Id: I8aa09914d76f20f30c2093961271202fe7add711
13 files changed