I can't develop without codesign, and I can't codesign without the relevant key in my KeyChain. But it's not there. And admittedly, it's probably me that deleted it, at some point, when things weren't working, and continued to refuse to work that I deleted everything with the attitude that I wanted to start from a tabula rasa. Ok, so now I'm stuck not being able to compile without the key. And I honestly have no idea where I got the first key (which I must have deleted) in the first place. Where did it come from? How can I retrieve it?