Hash operations should leave some feedback on progress

[saper]

Is your feature request related to a problem? Please describe.

I have a couple of large ISO files and kernels in my /boot. Many Heads operations (re-signing, looking for boot options) take a long time. Usually the systems seems stuck after printing *** Found verified kexec boot params or Veryfing presence of GPG card....

This led me to incorrect assumptions few times - I have suspected that something is wrong with smartcard operations, for example.

Describe the solution you'd like

Maybe sha256sum operation should print what it is doing (like giving the file name of the file being hashed).

Describe alternatives you've considered
No alternatives have been considered.