BE GUID calculation topic

In Arma 2 the battleye guid apparently is calculated by taking the cd key and running it through an md5 hash function like this

Code:

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Digest::MD5.hexdigest("BE" + Digest::MD5.hexdigest("XXXX-XXXXX-XXXXX-XXXXX-XXXXX"))

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Now that ArmA 3 does no longer rely on a serial number but your steam account how is the guid calculated? Does it take the steamid/steamid64 as input?