How to convert a .cer to a .p12 file

What works for me dealing with Push Notification certifies has been:

  1. Open the certificate: open my_filename.cer and click “View Certificates” to see the certificate’s name
  2. Go to Applications -> Utilities -> Keychain Access
  3. Ensure you have selected the “login” keychain, not the “system” one (thanks to @Matt Flettcher )
  4. Go to “Certificates”
  5. Look for the desired certificate
  6. Ensure that you can expand it and see under it the original “.certSigningRequest” used to generate the certificate
  7. At this moment you should be able to export it as “.p12”

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