If you want to wipe out your driver, dban could do it. It supports `DoD 5220.22-M`, but just for entire drivers. It is a bootable iso.
To delete files, scrub is the way, and it supports `DoD 5220.22-M`, `Peter Gutmann's 35 pass`, `Roy Pfitzner's 33-random-pass/7-random-pass` and others.
Pre-compiled scrub SLED package here.
**Related Stuff:**
What constitutes a Scrub “Pass”?