For Certificate operations, a Cloud VM Set has to be selected:

$ hicli cvmset select "Amazon EC2"

Create a certificate:

$ hicli cert new --password=Password123! --expiration=12/31/2019
Got certificate file /root/hcs-client-agent/hcs-api/2f323e29-1102-11e8-a35c-00505685149b_180213210932.cert

Show the description for a certificate::

$ hicli cert detail /2f323e29-1102-11e8-a35c-00505685149b_180213210932
Description Created by spate at 2013-04-17 20:30:23

Delete a certificate:

$ hicli cert rm 4c81a042a60b11e2b5cf000c29ed8423