rndc key for bind 9.3.0. catch-22?

[Robert Moskowitz]

At 02:21 PM 12/6/2004, Jim Reid wrote:
> >>>>> "Christopher" == Christopher L Barnard <cbar44 at tsg.cbot.com> writes:
>
>     Christopher> How do I generate a key for the /etc/rndc.conf file
>     Christopher> with bind version 9.3.0?
>
>Well the man page for rndc.conf describes two ways of doing this:
>
>[1] rndc-confgen
>[2] throw any old rubbish at mmencode or anything else that generates
>a valid base-64 encoded string

where is mmencode?  Can't seem to find it....