Find sum of diagonal elements in array using Java 8 streams

Need to find sum of respective diagonal elements using java 8 streams.

2d Array - { { 1, 2, 3 },
                    { 5, 6, 7},
                    { 8, 2, 3}}

Output - Sum1 (1+6+3) = 10
         Sum2 (3+6+8) = 17

I know to do this by for looping array. Can this done using Java 8 stream ? If yes, how ?