Cracking hashes for MacOS passwords
You may find that just like with most unix like systems OS X uses a salt and a hash. 

I would review some of the answers on AskDifferent such as:

What type of hash are a Mac&#39;s password stored in?


  Your password and the salt is grilled by sha512 many times, then the
  result is base64'ed and reverse xxd'ed. Together with the salt and the
  iterations it's xxd'ed and base64'ed again.