redhotpenguin,
Ok, I give up. Why don't you just copy/paste one of the pure perl crypto modules on CPAN. You mentioned the Unix crypt utility so why not borrow the source of Crypt::UnixCrypt?
I am not sure what else to tell you. Either you need to choose an encryption routine that is well known but is strong against attacks or you need to choose an encryption routine that is unknown. If you go the latter route coming up with one yourself may seem hard but I assure you it just takes some time thinking.
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Sorry if I frustrated you, I value your feedback and everyone elses, which is what I came here looking for :)
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