From f263a0f9ff5c050312f676b6684396ea118a8884 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com>
Date: Tue, 2 Jun 2020 09:12:05 +0200
Subject: [PATCH] bcm63xx: nand: support Sercomm firmwares
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Add support for Sercomm factory firmwares (AES 256 CBC encrypted).

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
---
 target/linux/bcm63xx/image/Makefile        | 58 ++++++++++++++++++++++
 target/linux/bcm63xx/image/bcm63xx_nand.mk |  9 ++++
 2 files changed, 67 insertions(+)

diff --git a/target/linux/bcm63xx/image/Makefile b/target/linux/bcm63xx/image/Makefile
index 5fbe8ea4701..fdeb100dd96 100644
--- a/target/linux/bcm63xx/image/Makefile
+++ b/target/linux/bcm63xx/image/Makefile
@@ -223,6 +223,64 @@ define Build/cfe-part-tag
 	dd if=$@.part >> $@
 endef
 
+define Build/cfe-sercomm-part
+	$(TOPDIR)/scripts/sercomm-partition-tag.py \
+		--input-file $@ \
+		--output-file $@.kernel_rootfs \
+		--part-name kernel_rootfs \
+		--part-version OpenWrt \
+		--rootfs-version $(SERCOMM_VERSION)
+
+	rm -rf $@-rootfs_lib
+	mkdir -p $@-rootfs_lib
+	echo $(SERCOMM_VERSION) > $@-rootfs_lib/lib_ver
+	$(call Build/cfe-jffs2,$@-rootfs_lib)
+	$(call Build/pad-to,$(BLOCKSIZE))
+	$(TOPDIR)/scripts/sercomm-partition-tag.py \
+		--input-file $@ \
+		--output-file $@.rootfs_lib \
+		--part-name rootfs_lib \
+		--part-version $(SERCOMM_VERSION)
+
+	rm -rf $@-bootloader
+	mkdir -p $@-bootloader
+	cp $(KDIR)/bcm63xx-cfe/$(CFE_RAM_FILE) $@-bootloader/$(CFE_RAM_JFFS2_NAME)
+	$(call Build/cfe-jffs2,$@-bootloader)
+	$(call Build/pad-to,$(BLOCKSIZE))
+	$(TOPDIR)/scripts/sercomm-partition-tag.py \
+		--input-file $@ \
+		--output-file $@.bootloader \
+		--part-name bootloader \
+		--part-version $(SERCOMM_VERSION)
+
+	mv $@.kernel_rootfs $@
+	dd if=$@.rootfs_lib >> $@
+	dd if=$@.bootloader >> $@
+endef
+
+define Build/cfe-sercomm-load
+	mv $@ $@.ser
+	echo $(SERCOMM_PID) | xxd -p -r > $@
+	sha256sum $@.ser | awk '{ print $1 }' | xxd -p -r >> $@
+	dd if=$@.ser >> $@
+	rm -f $@.ser
+endef
+
+define Build/cfe-sercomm-crypto
+	$(TOPDIR)/scripts/sercomm-crypto.py \
+		--input-file $@ \
+		--key-file $@.key \
+		--output-file $@.ser \
+		--version OpenWrt
+	$(STAGING_DIR_HOST)/bin/openssl enc -md md5 -aes-256-cbc \
+		-in $@ -out $@.enc \
+		-K `cat $@.key` \
+		-iv 00000000000000000000000000000000
+	dd if=$@.enc >> $@.ser
+	mv $@.ser $@
+	rm -f $@.enc $@.key
+endef
+
 define Build/cfe-old-bin
 	$(TOPDIR)/scripts/brcmImage.pl -t -p \
 		-o $@ -b $(CFE_BOARD_ID) -c $(CHIP_ID) \
diff --git a/target/linux/bcm63xx/image/bcm63xx_nand.mk b/target/linux/bcm63xx/image/bcm63xx_nand.mk
index 5483c73077e..57a895f9db4 100644
--- a/target/linux/bcm63xx/image/bcm63xx_nand.mk
+++ b/target/linux/bcm63xx/image/bcm63xx_nand.mk
@@ -7,6 +7,7 @@ DEVICE_VARS += CFE_RAM_FILE
 DEVICE_VARS += CFE_RAM_JFFS2_NAME CFE_RAM_JFFS2_PAD
 DEVICE_VARS += CFE_WFI_CHIP_ID CFE_WFI_FLASH_TYPE
 DEVICE_VARS += CFE_WFI_FLAGS CFE_WFI_VERSION
+DEVICE_VARS += SERCOMM_PID SERCOMM_VERSION
 
 # CFE expects a single JFFS2 partition with cferam and kernel. However,
 # it's possible to fool CFE into properly loading both cferam and kernel
@@ -36,6 +37,14 @@ define Device/bcm63xx-nand
   SUPPORTED_DEVICES := $(subst _,$(comma),$(1))
 endef
 
+define Device/sercomm-nand
+  $(Device/bcm63xx-nand)
+  IMAGES += factory.img
+  IMAGE/factory.img := append-kernel | pad-to $$$$(KERNEL_SIZE) | append-ubi | cfe-sercomm-part | gzip | cfe-sercomm-load | cfe-sercomm-crypto
+  SERCOM_PID :=
+  SERCOMM_VERSION :=
+endef
+
 ### Comtrend ###
 define Device/comtrend_vr-3032u
   $(Device/bcm63xx-nand)