Parse a PE binary to find a key and a signature contained therein.  Later
patches will check the signature and add the key if the signature checks out.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Acked-by: NVivek Goyal <vgoyal@redhat.com>
Reviewed-by: NKees Cook <keescook@chromium.org>