How can I wipe a disk from a Mac with firmware password set? I'm in a somewhat odd situation: I need to wipe the disk of a MBP, but I can't boot into Recovery Mode/from a CD/etc. as there is a firmware password set.

Is there a way to wipe the disk from within the OS? (I guess the answer will likely be no, but I had to check). Or maybe just to "remove" the encryption password from the HD so as to make it unreadable?

I've been looking around and have found several ways of wiping files (srm, "Permanent Erase", etc) but if possible I'd like to be more thorough.

PD: A bit of background to explain how I got to be in this situation: I've been doing some work for a company where they use Macs so they've loaned me a laptop configured as per their policies (encrypted drive, firmware pwd, etc); once but I've finished the project I have to return the laptop but I'd like to clean it up as much as I can before handing it back.
I am not personally aware of anything, but then I haven't done any work with firmware passwords...

Just a thought though, can you take the drive out stick it in an enclosure and format it on another computer? I know it's not what you asked but it might do the trick if you have an external drive enclosure and another Mac (or even PC...)