Add verb that takes a PKCS#1 signature (plain rsa) as input and a
certificates, and outputs a PKCS#7 binary detached signature (p7s),
which is what the kernel dm-verity driver expects.
Co-authored-by: Luca Boccassi <bluca@debian.org>
This new field allows specification of an fd on which the password
prompt logic will look for POLLHUP events for, and if seen will abort
the query.
The usecase for this is that when we query for a pw on behalf of a
Varlink client we can abort the query automatically if the client dies.
Let's gather generic key/certificate operations in a new tool
systemd-keyutil instead of spreading them across various special
purpose tools.
Fixes#35087