"fbffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
			"0e00000000000000000000000000000000000000000000000000000000000080",
		},
		{
			"y=p+15,sign+",
			"fcffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7f",
			"0f00000000000000000000000000000000000000000000000000000000000000",
		},
		{
			"y=p+15,sign-",
			"fcffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",

IHDR {
    width: 32; height: 32; bitdepth: 8;
    using grayscale;
}
gAMA {1.0000}
bKGD {gray: 0;}
tRNS {
    gray: 255;
}
IMAGE {
    pixels hex
ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
ffffffffffffffffffffffffffffddcceeffffffffffffffffffffffffffffff
ffffffffffffffffffffffeebb776655446699ddffffffffffffffffffffffff

	want = "693e47972caf527c7883ad1b39822f026f47db2ab0e1919955b8993aa04411d1"
	if got := hex.EncodeToString(p.Bytes()); got != want {
		t.Errorf("zero: got %q, want %q", got, want)
	}

	one := "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
	s, _ = new(Scalar).SetBytesWithClamping(decodeHex(one))
	p = new(Point).ScalarBaseMult(s)
	want = "12e9a68b73fd5aacdbcaf3e88c46fea6ebedb1aa84eed1842f07f8edab65e3a7"