NAME

       cert-to-efi-hash-list  -  tool  for  converting openssl certificates to EFI signature hash
       revocation lists

SYNOPSIS

       cert-to-efi-hash-list [-g <guid>][-t <timestamp>][-s <hash>]  <crt  file>  <efi  sig  list
       file>

DESCRIPTION

       Take  an  input  X509  certificate (in PEM format) and convert it to an EFI signature hash
       list file containing only that single certificate

OPTIONS

       -g <guid>
              Use <guid> as the owner of the signature. If this is not supplied, an all zero guid
              will be used

       -s <hash>
              Use SHA<hash> hash algorithm (256, 384, 512)

       -t <timestamp>
              Time of Revocation for hash signature

              Set to 0 if not specified meaning revoke for all time.

NOTE

       Signature revocation hashes are only implemented in UEFI 2.4 and up

EXAMPLES

       To take a standard X509 certificate in PEM format and produce an output EFI signature list
       file, simply do

       cert-to-efi-hash-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.