Does k8ssandra operator support enabling SSL/TLS encryption for internode and and client to node?

Does k8ssandra operator support enabling SSL/TLS encryption for internode and and client to node?
if yes ,does it support using our enterprise CA signed certificates ?
if yes what are the requirements for certificate generation and storing them as secrets.

Does k8ssandra operator support enabling SSL/TLS encryption for internode and and client to node?

Yes

if yes ,does it support using our enterprise CA signed certificates ?

Yes

if yes what are the requirements for certificate generation and storing them as secrets.

See the documentation here.

The secret format can be more flexible since this change was merged.