BSD license compatible hash algorithm?

Hi all,
Just wondering if anyone knew of a good BSD license compatible key- based hash placement / retrieval algorithm that was available anywhere.
I'm looking for a reliable way to lookup objects to see if a given action would be performed in my revised pkg_install(1), to thus efficiently pre-plan out the installation dependencies and fully utilize multiprocessing capabilities of contemporary machines / eliminate duplicate dependency install requirements.
I know I can use tree structures or hash(3), but I want to avoid trees (inefficient with large data sets of course) and I was looking for a non-BDB based solution (for right now, with this given structure as I don't want to write everything to disk). Later on it might be a good idea to cache the results using BDB on disk, but for now I was just wondering if there were any non-BDB based hashing solutions that anyone knew of.
Thanks,
-Garrett
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