#!/bin/sh
#
# See uefisign(8) manual page for usage instructions.
#
#

die() {
	echo "$*" > /dev/stderr
	exit 1
}

if [ $# -ne 1 ]; then
	echo "usage: $0 common-name"
	exit 1
fi

certfile="${1}.pem"
efifile="${1}.cer"
keyfile="${1}.key"
# XXX: Set this to ten years; we don't want system to suddenly stop booting
#      due to certificate expiration.  Better way would be to use Authenticode
#      Timestamp.  That said, the rumor is UEFI implementations ignore it anyway.
days="3650"
subj="/CN=${1}"

[ ! -e "${certfile}" ] || die "${certfile} already exists"
[ ! -e "${efifile}" ] || die "${efifile} already exists"
[ ! -e "${keyfile}" ] || die "${keyfile} already exists"

umask 077 || die "umask 077 failed"

openssl genrsa -out "${keyfile}" 2048 2> /dev/null || die "openssl genrsa failed"
openssl req -new -x509 -sha256 -days "${days}" -subj "${subj}" -key "${keyfile}" -out "${certfile}" || die "openssl req failed"
openssl x509 -inform PEM -outform DER -in "${certfile}" -out "${efifile}" || die "openssl x509 failed"

echo "certificate: ${certfile}; private key: ${keyfile}; certificate to enroll in UEFI: ${efifile}"