How to get a random string of 32 hexadecimal digits through command line?

I'd like to put together a command that will print out a string of 32 hexadecimal digits. I've got a Python script that works:

python -c 'import random ; print "".join(map(lambda t: format(t, "02X"), [random.randrange(256) for x in range(16)]))'

This generates output like:

6EF6B30F9E557F948C402C89002C7C8A 

Which is what I need.

On a Mac, I can even do this:

uuidgen | tr -d '-'

However, I don't have access to the more sophisticated scripting languages ruby and python, and I won't be on a Mac (so no uuidgen). I need to stick with more bash'ish tools like sed, awk, /dev/random because I'm on a limited platform. Is there a way to do this?