symmetric key encryption utilities

[Curtis Collicutt <curtis_(_at_)_ghostitm_(_dot_)_com>]

Hi,

I'm looking for a symmetric key encryption utility that
will:

	- encrypt a file with a specific symmetric key
	- using a specific algorithm (3DES, Twofish, ect)
	- has the option of not using a password or passphrase
	- and separates the encrypted file and the key used
          to encrypt it.

I've looked at mcrypt and gnupg. Both of these require a passphrase
to encrypt a file with a symmetric cypher.

Any suggestions as to another util or option on mcrypt/gnupg that 
will allow me to do this?

Thanks,
Curtis.

PS. 1) I've read all the docs for mcrypt and gnupg, but can't find
       any solutions.
    2) I don't want to write my own util.
    3) I've searched the misc, tech, mcrypt and gnupg archive to no
       avail.
    4) The reason I don't want to use the passphrase stuff is because
       I don't want to move to a passphrase system,
       which is much easier to break, when I can just worry about keeping
       the key secure. It's way harder to break a key than break a 
       passphrase based on english (and if I go to a random passphrase
       then what the heck is the point?).
    5) If I'm missing something important or obvious, then feel free to 
       call me a moron, as long as you tell me what I did wrong, I have
       thick skin. Thanks again.