No need to use an additional variable just to compose the salted pass.

dudeswave/src/dudeswave_user_handler.erl

@@ -70,8 +70,7 @@ is_conflict(Req, State) -> {false, Req, State}.
 
 create_user(Req, {Bucket, [{name, Name}, {username, User}, {password, Pass}]}) ->
 	Salt = rand:bytes(32),
-	SaltedPW = <<Pass/binary, Salt/binary>>,
-	Hash = crypto:hash(sha256, SaltedPW),
+	Hash = crypto:hash(sha256, <<Pass/binary, Salt/binary>>),
 
 	case storage:write(Bucket, User, Hash, [{salt, Salt}, {name, Name}]) of
 		ok ->