image: add additional fields to Netgear encrypted image

These fields are used for EAX12 and EX6250v2 series, and perhaps other
devices. Compatibility is preserved with the WAX202 and WAX206.

In addition, adds the related vars to DEVICE_VARS so that the variables
work correctly with multiple devices.

References in GPL source:
https://www.downloads.netgear.com/files/GPL/EAX12_EAX11v2_EAX15v2_GPL_V1.0.3.34_src.tar.gz

* tools/imgencoder/src/gj_enc.c
  Contains code that generates the encrypted image.

Signed-off-by: Wenli Looi <wlooi@ucalgary.ca>
(cherry picked from commit 0a1ebccc87)

include/image-commands.mk

@@ -423,6 +423,8 @@ define Build/netgear-encrypted-factory
 		--output-file $@ \
 		--model $(NETGEAR_ENC_MODEL) \
 		--region $(NETGEAR_ENC_REGION) \
+		$(if $(NETGEAR_ENC_HW_ID_LIST),--hw-id-list "$(NETGEAR_ENC_HW_ID_LIST)") \
+		$(if $(NETGEAR_ENC_MODEL_LIST),--model-list "$(NETGEAR_ENC_MODEL_LIST)") \
 		--version V1.0.0.0.$(shell cat $(VERSION_DIST)| sed -e 's/[[:space:]]/-/g').$(firstword $(subst -, ,$(REVISION))) \
 		--encryption-block-size 0x20000 \
 		--openssl-bin "$(STAGING_DIR_HOST)/bin/openssl" \

scripts/netgear-encrypted-factory.py

@@ -14,6 +14,8 @@ def main():
     parser.add_argument('--model', type=str, required=True)
     parser.add_argument('--region', type=str, required=True)
     parser.add_argument('--version', type=str, required=True)
+    parser.add_argument('--hw-id-list', type=str)
+    parser.add_argument('--model-list', type=str)
     parser.add_argument('--encryption-block-size', type=str, required=True)
     parser.add_argument('--openssl-bin', type=str, required=True)
     parser.add_argument('--key', type=str, required=True)
@@ -26,6 +28,10 @@ def main():
     assert (encryption_block_size > 0 and encryption_block_size % 16 ==
             0), 'Encryption block size must be a multiple of the AES block size (16)'
 
+    hw_id_list = args.hw_id_list.split(';') if args.hw_id_list else []
+    model_list = args.model_list.split(';') if args.model_list else []
+    hw_info = ';'.join(hw_id_list + model_list)
+
     image = open(args.input_file, 'rb').read()
     image_enc = []
     for i in range(0, len(image), encryption_block_size):
@@ -45,13 +51,18 @@ def main():
     image_enc = b''.join(image_enc)
 
     image_with_header = struct.pack(
-        '>32s32s64s64s64s256s12sII',
+        '>32s32s64s64sIBBB13s200s100s12sII',
         args.model.encode('ascii'),
         args.region.encode('ascii'),
         args.version.encode('ascii'),
         b'Thu Jan 1 00:00:00 1970',  # static date for reproducibility
+        0,  # product hw model
+        0,  # model index
+        len(hw_id_list),
+        len(model_list),
+        b'',  # reserved
+        hw_info.encode('ascii'),
         b'',  # reserved
-        b'',  # RSA signature - omitted for now
         b'encrpted_img',
         len(image_enc),
         encryption_block_size,

target/linux/mediatek/image/Makefile

@@ -6,6 +6,8 @@
 include $(TOPDIR)/rules.mk
 include $(INCLUDE_DIR)/image.mk
 
+DEVICE_VARS += NETGEAR_ENC_MODEL NETGEAR_ENC_REGION NETGEAR_ENC_HW_ID_LIST NETGEAR_ENC_MODEL_LIST
+
 loadaddr-$(CONFIG_TARGET_mediatek_mt7622) := 0x44000000
 loadaddr-$(CONFIG_TARGET_mediatek_mt7623) := 0x80008000
 loadaddr-$(CONFIG_TARGET_mediatek_mt7629) := 0x40008000
@@ -22,6 +24,10 @@ define Device/Default
   KERNEL_LOADADDR = $(loadaddr-y)
   FILESYSTEMS := squashfs
   DEVICE_DTS_DIR := $(DTS_DIR)
+  NETGEAR_ENC_MODEL :=
+  NETGEAR_ENC_REGION :=
+  NETGEAR_ENC_HW_ID_LIST :=
+  NETGEAR_ENC_MODEL_LIST :=
   IMAGES := sysupgrade.bin
   IMAGE/sysupgrade.bin := append-kernel | pad-to 128k | append-rootfs | \
 	pad-rootfs | append-metadata

target/linux/ramips/image/Makefile

@@ -7,6 +7,7 @@ include $(INCLUDE_DIR)/image.mk
 
 DEVICE_VARS += LOADER_TYPE LOADER_FLASH_OFFS LZMA_TEXT_START
 DEVICE_VARS += NETGEAR_BOARD_ID NETGEAR_HW_ID
+DEVICE_VARS += NETGEAR_ENC_MODEL NETGEAR_ENC_REGION NETGEAR_ENC_HW_ID_LIST NETGEAR_ENC_MODEL_LIST
 DEVICE_VARS += BUFFALO_TAG_PLATFORM BUFFALO_TAG_VERSION BUFFALO_TAG_MINOR
 DEVICE_VARS += SEAMA_SIGNATURE SEAMA_MTDBLOCK
 DEVICE_VARS += SERCOMM_HWNAME SERCOMM_HWID SERCOMM_HWVER SERCOMM_SWVER
@@ -179,6 +180,10 @@ define Device/Default
   SOC := $(DEFAULT_SOC)
   DEVICE_DTS_DIR := ../dts
   DEVICE_DTS = $$(SOC)_$(1)
+  NETGEAR_ENC_MODEL :=
+  NETGEAR_ENC_REGION :=
+  NETGEAR_ENC_HW_ID_LIST :=
+  NETGEAR_ENC_MODEL_LIST :=
   IMAGES := sysupgrade.bin
   COMPILE :=
   sysupgrade_bin := append-kernel | append-rootfs | pad-rootfs