Alternative for ikecert

Hi Folks...

Is there an alternative for ikecert(SunOS) - man info - "manipulates the machine's on-filesystem public-key certificate databases" in linux?

Can we use pkcs7, pkcs8 or something like that?...
I also came across ssh-keygen and ssh-keygen2...

My best guess is to use ssh-certtool in linux.

Really appreciate any help.
Thanks a lot for your time.

regards,
Ahamed.