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cert-to-efi-sig-list - tool for converting openssl certificates to EFI signature lists
To take a standard X509 certificate in PEM format and
produce an output EFI signature list file, simply do
cert-to-efi-sig-list PK.crt PK.esl
Note that the format of EFI signature list files is such
that they can simply be concatenated to produce a file with
multiple signatures:
cat PK1.esl PK2.esl > PK.esl
If your platform has a setup mode key manipulation ability,
the keys will often only be displayed by GUID, so using the
-g option to give your keys recognisable GUIDs will be
useful if you plan to manage lots of keys.
[see also]
sign-efi-sig-list(1) for details on how to create an
authenticated update to EFI secure variables when the EFI
system is in user mode.