Signing Identities and Certificates

https://help.apple.com/xcode/mac/current#/dev154b28f09?sub=dev23755c6c6help.apple.com

Create a signing certificate

• In the lower-left corner of the signing certificates sheet, click the Add button (+) , and choose a certificate type from the pop-up menu.

  You create different certificate types for use in different provisioning profiles.

Export a signing certificate

1. In the signing certificates sheet, Control-click the signing certificate and choose Export Certificate from the pop-up menu.

2. Enter a filename in the Save As field and a password in both the Password and Verify fields.

3. Click Save.

The file is saved to the location you specified with a .p12 filename extension. Alternatively, you can export certificates using the security(1) command-line tool.