NAME

       sig-list-to-certs - tool for converting EFI signature lists back to openssl certificates

SYNOPSIS

       sig-list-to-certs <efi sig list file> <cert file base name>

DESCRIPTION

       Takes  <efi  sig list file> and converts it to a set of DER format openssl certificates in
       <cert file base name>.n (where n runs from 0 to the number of certificates in the file)

EXAMPLES

       To see what certificates your UEFI system currently has, you can run the dmpstore  command
       to print them to a file

       dmpstore PK > PK.uc16

       This  file  isn't readily readable on a standard unix system because it's in UC-16 format,
       so convert it to ordinary text

       iconv -f utf-16 PK.uc16 > PK.txt

       Now remove the header which says something like

        Dump Variable pk
        Variable NV+RT+BS 'Efi:PK' DataSize = 2DA

       Leaving only the hex dump.  This can then be converted to an EFI signature list by xxd

       xxd -r PK.txt > PK.esl

       and you can now extract openssl readable certificates from this

       sig-list-to-certs PK.esl PK

       Which will print some information like

        X509 Header sls=730, header=0, sig=686
        file PK.0: Guid 77fa9abd-0359-4d32-4d60-28f4e78f784b
        Written 686 bytes

       And finally, you can see the certificate in text format

       openssl x509 -text -inform DER -in PK.0

       Assuming it's an X509 certificate

Usage: ./sig-list-to-certs <efi sig list fDec>em<berr2021le base name>         SIG-LIST-TO-CERTS(1)