Resign a eboot without a .rap

I don't know if this is the right section if so move it.

So my question is I have a unpacked pkg and I want to resign the eboot to a disc eboot, now this works if you have the rap but I don't, I tried making a rap with ps3keys with the bruteforced klic but the resigner says unable to decrypt.
So does anybody know if this is possible and if so how do I do it?