If there were in all likelihood it'd be found in the back of an old 2600 issue and the comments would be liberally sprinkled with '1337 sP34k. From the problem description it sounds like this would be in the class of trivial cracking tools that if you needed it you'd either already have written it already (if one were a white hat with the requisite minimal programming knowledge) or would have trolled a less respectable forum where such things would be circulated (were one a script kiddie).