From 5efffeea3d37803b528a21ce1213029340a20373 Mon Sep 17 00:00:00 2001
From: Bjørn Mork <bjorn@mork.no>
Date: Sun, 12 May 2019 11:04:57 +0200
Subject: WiP: fw generation sort-of working
MIME-Version: 1.0
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Signed-off-by: Bjørn Mork <bjorn@mork.no>
---
 Makefile  | 36 +++++++++++++++++++++++-------------
 update.sh | 14 +++++++++-----
 2 files changed, 32 insertions(+), 18 deletions(-)

diff --git a/Makefile b/Makefile
index a88f8f5..ba043cd 100644
--- a/Makefile
+++ b/Makefile
@@ -1,19 +1,21 @@
 # SPDX-License-Identifier: GPL-2.0
 # Copyright(c) 2019 Bjørn Mork <bjorn@mork.no>
 
-FILES=version opt.local
-PRIKEY=PriKey.pem
-SIGNKEY=signkey.pem
 MODEL=DCS-8000LH
 BUILD=9999
+PRIKEY=keys/$(MODEL)-PriKey.pem
+SIGNKEY=keys/$(MODEL)-sign.pem
 
-all: fw.tar
+OPTFILES=version opt.local
+FW_XTRA_FILES=
+
+all: fw
 
 version: dcs8000lh-configure.py
 	sed -ne 's/"//g' -e 's/^VERSION *= *//p' dcs8000lh-configure.py >$@
 
-opt.squashfs: $(FILES)
-	mksquashfs $(FILES) $@ -all-root -comp xz
+opt.squashfs: $(OPTFILES)
+	mksquashfs $(OPTFILES) $@ -all-root -comp xz
 
 aes.key:
 	openssl rand 16 > $@
@@ -25,14 +27,22 @@ aes.key.rsa: aes.key $(PRIKEY)
 sign.sha1.rsa: sign.sha1 $(SIGNKEY)
 	openssl rsautl -sign -inkey $(SIGNKEY) -out sign.sha1.rsa -in sign.sha1
 
+## FIXME:  It would be nice to have the D-Link signing key instead :-)
 $(SIGNKEY):
-	openssl genrsa -out $(SIGNKEY)
+	echo "WARNING: $(SIGNKEY) is missing - using a new abitrary key instead"
+	$(eval SIGNKEY := random-signkey.pem)
+	$(eval FW_XTRA_FILES := $(FW_XTRA_FILES) verify.key)
+	[ -f $(SIGNKEY) ] || openssl genrsa -out $(SIGNKEY)
+
+verify.key: $(SIGNKEY)
+	 openssl rsa -pubout -in $(SIGNKEY) -out $@
 
 sign.sha1: update.bin.aes aes.key.rsa certificate.info update.sha1
 	cat $^ | openssl dgst -sha1 | cut -d' ' -f2 > $@
 
-fw.tar: certificate.info aes.key.rsa sign.sha1.rsa update.aes update.bin.aes
-	tar cvf $@ $^
+fw: verify.key fw.tar
+fw.tar: certificate.info aes.key.rsa sign.sha1.rsa update.aes update.bin.aes $(FW_XTRA_FILES)
+	tar cvf $@ $^ $(FW_XTRA_FILES)
 
 update.sha1: update.aes
 	 openssl dgst -sha1 $^ | cut -d' ' -f2 > $@
@@ -40,9 +50,9 @@ update.sha1: update.aes
 update.aes: aes.key opt.squashfs
 	openssl aes-128-cbc -md md5 -kfile aes.key -nosalt -e -out $@ -in opt.squashfs
 
-update.bin: update.aes
+update.bin: aes.key update.aes update.sh
 	$(eval MD5SUM := $(shell openssl aes-128-cbc -md md5 -kfile aes.key -nosalt -d -in update.aes | md5sum - | cut -d' ' -f1 | md5sum - | cut -d' ' -f1))
-	sed -i -e "s/^MD5SUM=.*/MD5SUM=\"$(MD5SUM)\"/" -e "s/^VERSION=\"1.0.0-.*/VERSION=\"1.0.0-$(BUILD)\"/" update.bin
+	sed  -e "s/@@MODEL@@/\"$(MODEL)\"/" -e "s/@@MD5SUM@@/\"$(MD5SUM)\"/" -e "s/@@VERSION@@/\"1.0.0-$(BUILD)\"/" update.sh >update.bin
 
 certificate.info:
 	echo "Publisher:DMdssdFW1" >$@
@@ -56,8 +66,8 @@ update.bin.aes: aes.key update.bin
 	openssl aes-128-cbc -md md5 -kfile aes.key -nosalt -e -out $@ -in update.bin
 
 clean:
-	rm *.rsa *.aes opt.squashfs sign.sha1
+	rm -f *.rsa *.aes opt.squashfs sign.sha1 certificate.info update.bin update.sha1 fw.tar
 
 distclean: clean
-	rm aes.key
+	rm -f aes.key random-signkey.pem
 
diff --git a/update.sh b/update.sh
index dc8faca..abc6ad0 100644
--- a/update.sh
+++ b/update.sh
@@ -3,9 +3,9 @@ VENDOR="Alphanetworks"
 HWBOARD="r8000lh"
 HWVERSION="1.0.0"
 OEM="D-Link"
-MODEL="DCS-8000LH"
+MODEL=@@MODEL@@
 PRODUCT="Internet Camera"
-VERSION="1.0.0-9999"
+VERSION=@@VERSION@@
 PACKAGE=""
 WIRELESS_MODULE="RTL8723BU"
 DESCRIPT="An alternative opt."
@@ -19,7 +19,7 @@ It will update following, ...
 "
 }
 
-MD5SUM="acf7f6c0881b64f53018a26dd3e3b8c0"
+MD5SUM=@@MD5SUM@@
 
 MECH_SIGN="QPAT"
 MECH_VERSION="1.0"
@@ -32,7 +32,7 @@ showUsage() {
 exam() {
 	rm -f /tmp/update/md5
 	for i in $(cat /tmp/update/certificate.info | grep Contents | cut -d":" -f2); do
-		echo $(tar xOf "$1" $i.aes | openssl aes-128-cbc -k `cat /tmp/update/aes.key` -nosalt -d | md5sum - | cut -d' ' -f1 ) >> /tmp/update/md5
+		echo $(tar xOf "$1" $i.aes | openssl aes-128-cbc -kfile /tmp/update/aes.key -nosalt -d | md5sum - | cut -d' ' -f1 ) >> /tmp/update/md5
 	done
 	md5sum=$(md5sum /tmp/update/md5 | cut -d' ' -f1)
 	[ "$MD5SUM" = "$md5sum" ] && return 0
@@ -84,7 +84,11 @@ if [ "$action" = "update" ]; then
 	exam "$enc_bin" || { /etc/rc.d/init.d/services.sh start > /dev/null 2> /dev/null && exit 1; }
 
 	userdata="/dev/$(grep '"userdata"' /proc/mtd |cut -f1 -d:)"
-	tar xOf "$enc_bin" update.aes | openssl aes-128-cbc -k `cat /tmp/update/aes.key` -nosalt -d | dd of="$userdata" > /dev/null 2> /dev/null || exit 1
+	size=$(grep '"userdata"' /proc/mtd |cut -f2 -d\ )
+	blocksize=$(grep '"userdata"' /proc/mtd |cut -f3 -d\ )
+	blocks=$(( 0x${size} / 0x${blocksize} ))
+	/usr/bin/flash_erase "$userdata" 0 ${blocks}
+	tar xOf "$enc_bin" update.aes | openssl aes-128-cbc -k `cat /tmp/update/aes.key` -nosalt -d | dd bs=$((0x${blocksize})) of="$userdata" > /dev/null 2> /dev/null || exit 1
 
 	{(sleep 5 && reboot) > /dev/null 2> /dev/null &}
 	exit 0
-- 
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