Add the possibility to return only the PBKDF2 hash instead of the full string

functions.py

@@ -30,12 +30,14 @@ class pbkdf2( object ):
             self.stored_hash = None
             self.h = None
     
-    def hash( self ):
+    def hash( self, hash_only = False ):
         h = hashlib.pbkdf2_hmac( self.hash_name, self.word, self.salt, self.iterations )
         h = binascii.hexlify( h )
-        r = "$".join( map( str, [ "pbkdf2", self.hash_name, self.salt, self.iterations, h ] ) )
         
-        return r
+        if hash_only:
+            return h
+        else:
+            return "$".join( map( str, [ "pbkdf2", self.hash_name, self.salt, self.iterations, h ] ) )
     
     def verify( self ):
         return self.stored_hash == self.hash()