Generates ECDSA keys based on the
secp384r1 curve. The curve to use can be
configured in settings.json but currently only
SEC named curves are supported by this program. The ACME server provider may
also have limitations.
This extension can be added to the CSR with the command line option
--reuse-privatekey can be used to keep using the same
private key across different renewals, which can be useful for example with