m = natFromString(test.m)
		}

		z := nat(nil).expNN(x, y, m, false)
		if z.cmp(out) != 0 {
			t.Errorf("#%d got %s want %s", i, z.utoa(10), out.utoa(10))
		}
	}
}

func FuzzExpMont(f *testing.F) {
	f.Fuzz(func(t *testing.T, x1, x2, x3, y1, y2, y3, m1, m2, m3 uint) {
		if m1 == 0 && m2 == 0 && m3 == 0 {
			return
		}
		x := new(Int).SetBits([]Word{Word(x1), Word(x2), Word(x3)})