You can export a PEM-format certificate from a Mac.

Prerequisites

Become familiar with how to use Keychain Access on a Mac. For more information, see the Apple Support Web site at http://support.apple.com.

Procedure

  1. On the Mac, open Keychain Access.
  2. From the sidebar, select System Roots.
  3. Locate the certificate to export.
  4. Select File > Export Items.
  5. Select a location to save the certificate and select the Privacy Enhanced Mail (.pem) file format.