Get Email Hashes of My Facebook Connections

Is it possible? Just need the CRC32_MD5 hash they use, but can't seem to find the way of doing it.

Note that this is not a dup of this other question 开发者_如何学Pythonsince the question and it's answers are focused on getting the plain email, not the hash.

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You can use FQL to get this. Specifically the email_hashes field. You can then combine it with connect.registerUsers and compare it with your existing user DB.