Is it mandatory to generate host keys on the target host, or can they be generated on another host and transfer to thetarget host

[Patrice.Gonthier at alcatel.fr]

Hello,

My question in 2 words is the following:

Is it mandatory to generate host keys on the target host, or can they be
       generated on another host and transfer to thetarget host ?


If my question is not clear here is an example...


I need to install host keys on a host server.

I imagine the usual way is to launch the following command locally on the
host server .
# ssh-keygen -t rsa1 -f /usr/local/etc/ssh_host_key -N ""

My question is:
Is is possible to generate host keys on another host, and in a second step
to install them on athe host server.

Thank you by advance for your help ....

Patrice