Default Signing .zip for stock recovery?

I'm trying to restore my build.prop from stock recovery. I create the zip file and sign it but when trying to flash it I get "E: Footer is wrong". Any ideas? I can not use ADB or edit the build.prop from the phone since after editing the build.prop the ui process does nothing but crash when booted up.

I'm guessing I'm not signing the zip with the appropriate key....