SIG-LIST-TO-CERTS(1)

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