Please document how to change the hashed default password

It is not visible from the commit how this hash was generated:

https://github.com/systemd/particleos/commit/9f49c2ccbe1079b6ebb8530a620a1e4c2c4911a2#diff-7aaf3e906de151483ef5e529b1e9fae0d2b41c3e091584a34f54db0f9983ac09R12-R15

systemd documentation, says libcrypt shall be used. But I wonder if there is some commandline tooling?