How to get the hash linked to a GeneratedUID in El Capitan?
The hashes of the users are stored in a different place since 10.7:

/var/db/dslocal/nodes/Default/users/&lt;user&gt;.plist


To get the shadow hash enter:

sudo defaults read /var/db/dslocal/nodes/Default/users/&lt;user&gt;.plist ShadowHashData | tr -dc '0-9a-f ' | xxd -p -r | plutil -convert xml1 - -o -


or directly through directory services:

sudo dscl . read /Users/&lt;user&gt; AuthenticationAuthority


and 

sudo dscl . read /Users/&lt;user&gt; dsAttrTypeNative:ShadowHashData