Gardenlock
Standalone drop-in implementation of systemd-pcrextend, systemd-tpm2-setup and systemd-measure.
Implements all systemd features, except for the varlink interface.
Source
Gardenlock can be downloaded from https://git.pinkro.se/Rose/gardenhouse/gardenlock.git/about/
It's also mirrored to Codeberg where bugtracking is done.
An app-crypt/gardenlock port is available in the Gardenhouse portage overlay