swtpm_localca: Introduce --key as more generic alias for --ek

swtpm_localca may also receive the key parameters of other keys than
the ek, therefore introduce the --key alias for --ek and rename the
variable ekparmas to key_params throughout the code.

Extend the man page to describe the --key option as an alias that
is to be used for other public key parameters than specifically those
of an ek.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
2 files changed