if s[:1] != "P" && s[:1] != "X" {
			t.Errorf("unexpected Curve string encoding: %q", s)
		}
	})
}

func TestX25519Failure(t *testing.T) {
	identity := hexDecode(t, "0000000000000000000000000000000000000000000000000000000000000000")
	lowOrderPoint := hexDecode(t, "e0eb7a7c3b41b8ae1656e3faf19fc46ada098deb9c32b1fd866205165f49b800")
	randomScalar := make([]byte, 32)
	rand.Read(randomScalar)

	repeatedDashes = "" +
		"----------------------------------------------------------------" +
		"----------------------------------------------------------------"
	repeatedZeroes = "" +
		"0000000000000000000000000000000000000000000000000000000000000000"
	repeatedEquals = "" +
		"================================================================" +
		"================================================================"
	repeatedTabs = "" +