Original 'C' progam submitted by Juriy Goloveshkin.
A different 'C' program also submitted by dima.
I merged and rewrote them to include error handling, use getlogin for
user name and only the BSD boilerplate license remained from the
original code. We also only allow root to get other user's keys.
Review, bikeshed and bdelint(1): myself, kris, dima, markm
