pre-shared key

[Steven Lee <slee@cygnacom.com>]

Could anyone describe or direct me to a document that shows how
pre-shared key is used to derive a DES key?

I found the following information, but it doesn't describe how
pre-shared key is used with Diffie-Hellman to derive k.  

Message 3:  A -> B
		Hdr, g^x (Diffie-Hellman exchange), Nonce(A)
Message 4:  B -> A
Hdr, g^y, Nonce(B)

Both A and B now generate keying material
		keying material used to encrypt and authenticate next
two messages
		a pre-shared key is needed at this point
Message 5:  A -> B
Hdr, {ID(A), Hash(stuff[a])}(encrypted with k)

Thanks,

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