diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..89b446a
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,2 @@
+ccross@android.com
+dwillemsen@google.com
diff --git a/core/Makefile b/core/Makefile
index f666bce..b6a9780 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -567,25 +567,25 @@
 
 else ifeq (true,$(BOARD_AVB_ENABLE)) # TARGET_BOOTIMAGE_USE_EXT2 != true
 
-$(INSTALLED_BOOTIMAGE_TARGET): $(MKBOOTIMG) $(AVBTOOL) $(INTERNAL_BOOTIMAGE_FILES)
+$(INSTALLED_BOOTIMAGE_TARGET): $(MKBOOTIMG) $(AVBTOOL) $(INTERNAL_BOOTIMAGE_FILES) $(BOARD_AVB_BOOT_KEY_PATH)
 	$(call pretty,"Target boot image: $@")
 	$(hide) $(MKBOOTIMG) $(INTERNAL_BOOTIMAGE_ARGS) $(INTERNAL_MKBOOTIMG_VERSION_ARGS) $(BOARD_MKBOOTIMG_ARGS) --output $@
 	$(hide) $(call assert-max-image-size,$@,$(BOARD_BOOTIMAGE_PARTITION_SIZE))
 	$(hide) $(AVBTOOL) add_hash_footer \
 	  --image $@ \
 	  --partition_size $(BOARD_BOOTIMAGE_PARTITION_SIZE) \
-	  --partition_name boot $(INTERNAL_AVB_SIGNING_ARGS) \
+	  --partition_name boot $(INTERNAL_AVB_BOOT_SIGNING_ARGS) \
 	  $(BOARD_AVB_BOOT_ADD_HASH_FOOTER_ARGS)
 
 .PHONY: bootimage-nodeps
-bootimage-nodeps: $(MKBOOTIMG) $(AVBTOOL)
+bootimage-nodeps: $(MKBOOTIMG) $(AVBTOOL) $(BOARD_AVB_BOOT_KEY_PATH)
 	@echo "make $@: ignoring dependencies"
 	$(hide) $(MKBOOTIMG) $(INTERNAL_BOOTIMAGE_ARGS) $(INTERNAL_MKBOOTIMG_VERSION_ARGS) $(BOARD_MKBOOTIMG_ARGS) --output $(INSTALLED_BOOTIMAGE_TARGET)
 	$(hide) $(call assert-max-image-size,$(INSTALLED_BOOTIMAGE_TARGET),$(BOARD_BOOTIMAGE_PARTITION_SIZE))
 	$(hide) $(AVBTOOL) add_hash_footer \
 	  --image $@ \
 	  --partition_size $(BOARD_BOOTIMAGE_PARTITION_SIZE) \
-	  --partition_name boot $(INTERNAL_AVB_SIGNING_ARGS) \
+	  --partition_name boot $(INTERNAL_AVB_BOOT_SIGNING_ARGS) \
 	  $(BOARD_AVB_BOOT_ADD_HASH_FOOTER_ARGS)
 
 else ifeq (true,$(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_SUPPORTS_BOOT_SIGNER)) # BOARD_AVB_ENABLE != true
@@ -866,6 +866,10 @@
 endif
 endif
 
+ifeq ($(BOARD_AVB_ENABLE),true)
+INTERNAL_USERIMAGES_DEPS += $(AVBTOOL)
+endif
+
 ifneq (true,$(TARGET_USERIMAGES_SPARSE_SQUASHFS_DISABLED))
   INTERNAL_USERIMAGES_SPARSE_SQUASHFS_FLAG := -s
 endif
@@ -940,12 +944,21 @@
 $(if $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_SUPPORTS_VBOOT),$(hide) echo "vboot_subkey=$(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_VBOOT_SIGNING_SUBKEY)" >> $(1))
 $(if $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_SUPPORTS_VBOOT),$(hide) echo "futility=$(notdir $(FUTILITY))" >> $(1))
 $(if $(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_SUPPORTS_VBOOT),$(hide) echo "vboot_signer_cmd=$(VBOOT_SIGNER)" >> $(1))
-$(if $(BOARD_AVB_ENABLE),$(hide) echo "avb_signing_args=$(INTERNAL_AVB_SIGNING_ARGS)" >> $(1))
 $(if $(BOARD_AVB_ENABLE),$(hide) echo "avb_avbtool=$(notdir $(AVBTOOL))" >> $(1))
-$(if $(BOARD_AVB_ENABLE),$(hide) echo "system_avb_hashtree_enable=$(BOARD_AVB_ENABLE)" >> $(1))
-$(if $(BOARD_AVB_ENABLE),$(hide) echo "system_avb_add_hashtree_footer_args=$(BOARD_AVB_SYSTEM_ADD_HASHTREE_FOOTER_ARGS)" >> $(1))
-$(if $(BOARD_AVB_ENABLE),$(hide) echo "vendor_avb_hashtree_enable=$(BOARD_AVB_ENABLE)" >> $(1))
-$(if $(BOARD_AVB_ENABLE),$(hide) echo "vendor_avb_add_hashtree_footer_args=$(BOARD_AVB_VENDOR_ADD_HASHTREE_FOOTER_ARGS)" >> $(1))
+$(if $(BOARD_AVB_ENABLE),$(hide) echo "avb_system_hashtree_enable=$(BOARD_AVB_ENABLE)" >> $(1))
+$(if $(BOARD_AVB_ENABLE),$(hide) echo "avb_system_add_hashtree_footer_args=$(BOARD_AVB_SYSTEM_ADD_HASHTREE_FOOTER_ARGS)" >> $(1))
+$(if $(BOARD_AVB_ENABLE),\
+    $(if $(BOARD_AVB_SYSTEM_KEY_PATH),\
+        $(hide) echo "avb_system_key_path=$(BOARD_AVB_SYSTEM_KEY_PATH)" >> $(1)
+        $(hide) echo "avb_system_algorithm=$(BOARD_AVB_SYSTEM_ALGORITHM)" >> $(1)
+        $(hide) echo "avb_system_rollback_index_location=$(BOARD_AVB_SYSTEM_ROLLBACK_INDEX_LOCATION)" >> $(1)))
+$(if $(BOARD_AVB_ENABLE),$(hide) echo "avb_vendor_hashtree_enable=$(BOARD_AVB_ENABLE)" >> $(1))
+$(if $(BOARD_AVB_ENABLE),$(hide) echo "avb_vendor_add_hashtree_footer_args=$(BOARD_AVB_VENDOR_ADD_HASHTREE_FOOTER_ARGS)" >> $(1))
+$(if $(BOARD_AVB_ENABLE),\
+    $(if $(BOARD_AVB_VENDOR_KEY_PATH),\
+        $(hide) echo "avb_vendor_key_path=$(BOARD_AVB_VENDOR_KEY_PATH)" >> $(1)
+        $(hide) echo "avb_vendor_algorithm=$(BOARD_AVB_VENDOR_ALGORITHM)" >> $(1)
+        $(hide) echo "avb_vendor_rollback_index_location=$(BOARD_AVB_VENDOR_ROLLBACK_INDEX_LOCATION)" >> $(1)))
 $(if $(filter true,$(BOARD_USES_RECOVERY_AS_BOOT)),\
     $(hide) echo "recovery_as_boot=true" >> $(1))
 $(if $(filter true,$(BOARD_BUILD_SYSTEM_ROOT_IMAGE)),\
@@ -1149,7 +1162,7 @@
       $(hide) $(AVBTOOL) add_hash_footer \
         --image $(1) \
         --partition_size $(BOARD_BOOTIMAGE_PARTITION_SIZE) \
-        --partition_name boot $(INTERNAL_AVB_SIGNING_ARGS) \
+        --partition_name boot $(INTERNAL_AVB_BOOT_SIGNING_ARGS) \
         $(BOARD_AVB_BOOT_ADD_HASH_FOOTER_ARGS))
   $(if $(filter true,$(BOARD_USES_RECOVERY_AS_BOOT)), \
     $(hide) $(call assert-max-image-size,$(1),$(BOARD_BOOTIMAGE_PARTITION_SIZE)), \
@@ -1165,7 +1178,7 @@
 $(INSTALLED_BOOTIMAGE_TARGET) : $(VBOOT_SIGNER)
 endif
 ifeq (true,$(BOARD_AVB_ENABLE))
-$(INSTALLED_BOOTIMAGE_TARGET) : $(AVBTOOL)
+$(INSTALLED_BOOTIMAGE_TARGET) : $(AVBTOOL) $(BOARD_AVB_BOOT_KEY_PATH)
 endif
 $(INSTALLED_BOOTIMAGE_TARGET): $(MKBOOTFS) $(MKBOOTIMG) $(MINIGZIP) \
 		$(INSTALLED_RAMDISK_TARGET) \
@@ -1235,7 +1248,6 @@
     $(PDK_FUSION_SYSIMG_FILES) \
     $(RECOVERY_RESOURCE_ZIP))
 
-
 FULL_SYSTEMIMAGE_DEPS := $(INTERNAL_SYSTEMIMAGE_FILES) $(INTERNAL_USERIMAGES_DEPS)
 
 # ASAN libraries in the system image - add dependency.
@@ -1357,6 +1369,9 @@
 endif
 endif
 
+.PHONY: sync
+sync: $(INTERNAL_SYSTEMIMAGE_FILES)
+
 #######
 ## system tarball
 define build-systemtarball-target
@@ -1739,6 +1754,8 @@
 vendorimage-nodeps vnod: | $(INTERNAL_USERIMAGES_DEPS) $(DEPMOD)
 	$(build-vendorimage-target)
 
+sync: $(INTERNAL_VENDORIMAGE_FILES)
+
 else ifdef BOARD_PREBUILT_VENDORIMAGE
 INSTALLED_VENDORIMAGE_TARGET := $(PRODUCT_OUT)/vendor.img
 $(eval $(call copy-one-file,$(BOARD_PREBUILT_VENDORIMAGE),$(INSTALLED_VENDORIMAGE_TARGET)))
@@ -1750,12 +1767,12 @@
 INSTALLED_DTBOIMAGE_TARGET := $(PRODUCT_OUT)/dtbo.img
 
 ifeq ($(BOARD_AVB_ENABLE),true)
-$(INSTALLED_DTBOIMAGE_TARGET): $(BOARD_PREBUILT_DTBOIMAGE) $(AVBTOOL)
+$(INSTALLED_DTBOIMAGE_TARGET): $(BOARD_PREBUILT_DTBOIMAGE) $(AVBTOOL) $(BOARD_AVB_DTBO_KEY_PATH)
 	cp $(BOARD_PREBUILT_DTBOIMAGE) $@
 	$(AVBTOOL) add_hash_footer \
 		--image $@ \
 		--partition_size $(BOARD_DTBOIMG_PARTITION_SIZE) \
-		--partition_name dtbo $(INTERNAL_AVB_SIGNING_ARGS) \
+		--partition_name dtbo $(INTERNAL_AVB_DTBO_SIGNING_ARGS) \
 		$(BOARD_AVB_DTBO_ADD_HASH_FOOTER_ARGS)
 else
 $(INSTALLED_DTBOIMAGE_TARGET): $(BOARD_PREBUILT_DTBOIMAGE)
@@ -1764,44 +1781,109 @@
 
 endif
 
+# Convert to lower case without requiring a shell, which isn't cacheable.
+to-lower = $(subst A,a,$(subst B,b,$(subst C,c,$(subst D,d,$(subst E,e,$(subst F,f,$(subst G,g,\
+$(subst H,h,$(subst I,i,$(subst J,j,$(subst K,k,$(subst L,l,$(subst M,m,$(subst N,n,$(subst O,o,\
+$(subst P,p,$(subst Q,q,$(subst R,r,$(subst S,s,$(subst T,t,$(subst U,u,$(subst V,v,$(subst W,w,\
+$(subst X,x,$(subst Y,y,$(subst Z,z,$1))))))))))))))))))))))))))
+
 # -----------------------------------------------------------------
 # vbmeta image
 ifeq ($(BOARD_AVB_ENABLE),true)
 
 BUILT_VBMETAIMAGE_TARGET := $(PRODUCT_OUT)/vbmeta.img
+AVB_CHAIN_KEY_DIR := $(TARGET_OUT_INTERMEDIATES)/avb_chain_keys
 
-INTERNAL_AVB_MAKE_VBMETA_IMAGE_ARGS := \
-    --include_descriptors_from_image $(INSTALLED_BOOTIMAGE_TARGET) \
-    --include_descriptors_from_image $(INSTALLED_SYSTEMIMAGE) \
+ifdef BOARD_AVB_KEY_PATH
+$(if $(BOARD_AVB_ALGORITHM),,$(error BOARD_AVB_ALGORITHM is not defined))
+else
+# If key path isn't specified, use the 4096-bit test key.
+BOARD_AVB_ALGORITHM := SHA256_RSA4096
+BOARD_AVB_KEY_PATH := external/avb/test/data/testkey_rsa4096.pem
+endif
+
+INTERNAL_AVB_SIGNING_ARGS := \
+    --algorithm $(BOARD_AVB_ALGORITHM) --key $(BOARD_AVB_KEY_PATH)
+
+BOOT_FOOTER_ARGS := BOARD_AVB_BOOT_ADD_HASH_FOOTER_ARGS
+DTBO_FOOTER_ARGS := BOARD_AVB_DTBO_ADD_HASH_FOOTER_ARGS
+SYSTEM_FOOTER_ARGS := BOARD_AVB_SYSTEM_ADD_HASHTREE_FOOTER_ARGS
+VENDOR_FOOTER_ARGS := BOARD_AVB_VENDOR_ADD_HASHTREE_FOOTER_ARGS
+
+# Check and set required build variables for a chain partition.
+# $(1): the partition to enable AVB chain, e.g., BOOT or SYSTEM.
+define check-and-set-avb-chain-args
+$(eval PART := $(1))
+$(eval part=$(call to-lower,$(PART)))
+
+$(eval _key_path := BOARD_AVB_$(PART)_KEY_PATH)
+$(eval _signing_algorithm := BOARD_AVB_$(PART)_ALGORITHM)
+$(eval _rollback_index := BOARD_AVB_$(PART)_ROLLBACK_INDEX)
+$(eval _rollback_index_location := BOARD_AVB_$(PART)_ROLLBACK_INDEX_LOCATION)
+$(if $($(_key_path)),,$(error $(_key_path) is not defined))
+$(if $($(_signing_algorithm)),,$(error $(_signing_algorithm) is not defined))
+$(if $($(_rollback_index)),,$(error $(_rollback_index) is not defined))
+$(if $($(_rollback_index_location)),,$(error $(_rollback_index_location) is not defined))
+
+# Set INTERNAL_AVB_(PART)_SIGNING_ARGS
+$(eval _signing_args := INTERNAL_AVB_$(PART)_SIGNING_ARGS)
+$(eval $(_signing_args) := \
+    --algorithm $($(_signing_algorithm)) --key $($(_key_path)))
+
+$(eval INTERNAL_AVB_MAKE_VBMETA_IMAGE_ARGS += \
+    --chain_partition $(part):$($(_rollback_index_location)):$(AVB_CHAIN_KEY_DIR)/$(part).avbpubkey)
+
+# Set rollback_index via footer args
+$(eval _footer_args := $(PART)_FOOTER_ARGS)
+$(eval $($(_footer_args)) += --rollback_index $($(_rollback_index)))
+endef
+
+ifdef BOARD_AVB_BOOT_KEY_PATH
+$(eval $(call check-and-set-avb-chain-args,BOOT))
+else
+INTERNAL_AVB_MAKE_VBMETA_IMAGE_ARGS += \
+    --include_descriptors_from_image $(INSTALLED_BOOTIMAGE_TARGET)
+endif
+
+ifdef BOARD_AVB_SYSTEM_KEY_PATH
+$(eval $(call check-and-set-avb-chain-args,SYSTEM))
+else
+INTERNAL_AVB_MAKE_VBMETA_IMAGE_ARGS += \
+    --include_descriptors_from_image $(INSTALLED_SYSTEMIMAGE)
+endif
 
 ifdef INSTALLED_VENDORIMAGE_TARGET
+ifdef BOARD_AVB_VENDOR_KEY_PATH
+$(eval $(call check-and-set-avb-chain-args,VENDOR))
+else
 INTERNAL_AVB_MAKE_VBMETA_IMAGE_ARGS += \
     --include_descriptors_from_image $(INSTALLED_VENDORIMAGE_TARGET)
 endif
+endif
 
 ifdef INSTALLED_DTBOIMAGE_TARGET
+ifdef BOARD_AVB_DTBO_KEY_PATH
+$(eval $(call check-and-set-avb-chain-args,DTBO))
+else
 INTERNAL_AVB_MAKE_VBMETA_IMAGE_ARGS += \
     --include_descriptors_from_image $(INSTALLED_DTBOIMAGE_TARGET)
 endif
+endif
 
 INTERNAL_AVB_MAKE_VBMETA_IMAGE_ARGS += --padding_size 4096
 
+# Add kernel cmdline descriptor for kernel to mount system.img as root with
+# dm-verity. This works when system.img is either chained or not-chained:
+# - chained: The --setup_as_rootfs_from_kernel option will add dm-verity kernel
+#   cmdline descriptor to system.img
+# - not-chained: The --include_descriptors_from_image option for make_vbmeta_image
+#   will include the kernel cmdline descriptor from system.img into vbmeta.img
 ifeq ($(BOARD_BUILD_SYSTEM_ROOT_IMAGE),true)
-INTERNAL_AVB_MAKE_VBMETA_IMAGE_ARGS += --setup_rootfs_from_kernel $(BUILT_SYSTEMIMAGE)
+BOARD_AVB_SYSTEM_ADD_HASHTREE_FOOTER_ARGS += --setup_as_rootfs_from_kernel
 endif
 
 ifdef BOARD_AVB_ROLLBACK_INDEX
-INTERNAL_AVB_MAKE_VBMETA_IMAGE_ARGS += --rollback_index $(BOARD_AVB_ROLLBACK_INDEX)
-endif
-
-ifndef BOARD_AVB_KEY_PATH
-# If key path isn't specified, use the 4096-bit test key.
-INTERNAL_AVB_SIGNING_ARGS := \
-    --algorithm SHA256_RSA4096 \
-    --key external/avb/test/data/testkey_rsa4096.pem
-else
-INTERNAL_AVB_SIGNING_ARGS := \
-    --algorithm $(BOARD_AVB_ALGORITHM) --key $(BOARD_AVB_KEY_PATH)
+BOARD_AVB_MAKE_VBMETA_IMAGE_ARGS += --rollback_index $(BOARD_AVB_ROLLBACK_INDEX)
 endif
 
 ifndef BOARD_BOOTIMAGE_PARTITION_SIZE
@@ -1812,26 +1894,42 @@
   $(error BOARD_SYSTEMIMAGE_PARTITION_SIZE must be set for BOARD_AVB_ENABLE)
 endif
 
+# $(1): the directory to extract public keys to
+define extract-avb-chain-public-keys
+  $(if $(BOARD_AVB_BOOT_KEY_PATH),\
+    $(hide) $(AVBTOOL) extract_public_key --key $(BOARD_AVB_BOOT_KEY_PATH) \
+      --output $(1)/boot.avbpubkey)
+  $(if $(BOARD_AVB_SYSTEM_KEY_PATH),\
+    $(hide) $(AVBTOOL) extract_public_key --key $(BOARD_AVB_SYSTEM_KEY_PATH) \
+      --output $(1)/system.avbpubkey)
+  $(if $(BOARD_AVB_VENDOR_KEY_PATH),\
+    $(hide) $(AVBTOOL) extract_public_key --key $(BOARD_AVB_VENDOR_KEY_PATH) \
+      --output $(1)/vendor.avbpubkey)
+  $(if $(BOARD_AVB_DTBO_KEY_PATH),\
+    $(hide) $(AVBTOOL) extract_public_key --key $(BOARD_AVB_DTBO_KEY_PATH) \
+      --output $(1)/dtbo.avbpubkey)
+endef
+
 define build-vbmetaimage-target
   $(call pretty,"Target vbmeta image: $(INSTALLED_VBMETAIMAGE_TARGET)")
+  $(hide) mkdir -p $(AVB_CHAIN_KEY_DIR)
+  $(call extract-avb-chain-public-keys, $(AVB_CHAIN_KEY_DIR))
   $(hide) $(AVBTOOL) make_vbmeta_image \
     $(INTERNAL_AVB_MAKE_VBMETA_IMAGE_ARGS) \
     $(INTERNAL_AVB_SIGNING_ARGS) \
     $(BOARD_AVB_MAKE_VBMETA_IMAGE_ARGS) \
     --output $@
+  $(hide) rm -rf $(AVB_CHAIN_KEY_DIR)
 endef
 
 INSTALLED_VBMETAIMAGE_TARGET := $(BUILT_VBMETAIMAGE_TARGET)
-$(INSTALLED_VBMETAIMAGE_TARGET): $(AVBTOOL) $(INSTALLED_BOOTIMAGE_TARGET) $(INSTALLED_SYSTEMIMAGE) $(INSTALLED_VENDORIMAGE_TARGET) $(INSTALLED_DTBOIMAGE_TARGET)
+$(INSTALLED_VBMETAIMAGE_TARGET): $(AVBTOOL) $(INSTALLED_BOOTIMAGE_TARGET) $(INSTALLED_SYSTEMIMAGE) $(INSTALLED_VENDORIMAGE_TARGET) $(INSTALLED_DTBOIMAGE_TARGET) $(BOARD_AVB_KEY_PATH)
 	$(build-vbmetaimage-target)
 
 .PHONY: vbmetaimage-nodeps
 vbmetaimage-nodeps:
 	$(build-vbmetaimage-target)
 
-# We need $(AVBTOOL) for system.img generation.
-FULL_SYSTEMIMAGE_DEPS += $(AVBTOOL)
-
 endif # BOARD_AVB_ENABLE
 
 # -----------------------------------------------------------------
@@ -2234,11 +2332,17 @@
 	$(hide) echo "full_recovery_image=true" >> $(zip_root)/META/misc_info.txt
 endif
 ifeq ($(BOARD_AVB_ENABLE),true)
-	$(hide) echo "board_avb_enable=true" >> $(zip_root)/META/misc_info.txt
-	$(hide) echo "board_avb_rollback_index=$(BOARD_AVB_ROLLBACK_INDEX)" >> $(zip_root)/META/misc_info.txt
-	$(hide) echo "board_avb_boot_add_hash_footer_args=$(BOARD_AVB_BOOT_ADD_HASH_FOOTER_ARGS)" >> $(zip_root)/META/misc_info.txt
-	$(hide) echo "board_avb_make_vbmeta_image_args=$(BOARD_AVB_MAKE_VBMETA_IMAGE_ARGS)" >> $(zip_root)/META/misc_info.txt
-endif
+	$(hide) echo "avb_enable=true" >> $(zip_root)/META/misc_info.txt
+	$(hide) echo "avb_vbmeta_key_path=$(BOARD_AVB_KEY_PATH)" >> $(zip_root)/META/misc_info.txt
+	$(hide) echo "avb_vbmeta_algorithm=$(BOARD_AVB_ALGORITHM)" >> $(zip_root)/META/misc_info.txt
+	$(hide) echo "avb_vbmeta_args=$(BOARD_AVB_MAKE_VBMETA_IMAGE_ARGS)" >> $(zip_root)/META/misc_info.txt
+	$(hide) echo "avb_boot_add_hash_footer_args=$(BOARD_AVB_BOOT_ADD_HASH_FOOTER_ARGS)" >> $(zip_root)/META/misc_info.txt
+ifdef BOARD_AVB_BOOT_KEY_PATH
+	$(hide) echo "avb_boot_key_path=$(BOARD_AVB_BOOT_KEY_PATH)" >> $(zip_root)/META/misc_info.txt
+	$(hide) echo "avb_boot_algorithm=$(BOARD_AVB_BOOT_ALGORITHM)" >> $(zip_root)/META/misc_info.txt
+	$(hide) echo "avb_boot_rollback_index_location=$(BOARD_AVB_BOOT_ROLLBACK_INDEX_LOCATION)" >> $(zip_root)/META/misc_info.txt
+endif # BOARD_AVB_BOOT_KEY_PATH
+endif # BOARD_AVB_ENABLE
 ifdef BOARD_BPT_INPUT_FILES
 	$(hide) echo "board_bpt_enable=true" >> $(zip_root)/META/misc_info.txt
 	$(hide) echo "board_bpt_make_table_args=$(BOARD_BPT_MAKE_TABLE_ARGS)" >> $(zip_root)/META/misc_info.txt
@@ -2296,10 +2400,15 @@
 	$(hide) echo "has_dtbo=true" >> $(zip_root)/META/misc_info.txt
 ifeq ($(BOARD_AVB_ENABLE),true)
 	$(hide) echo "dtbo_size=$(BOARD_DTBOIMG_PARTITION_SIZE)" >> $(zip_root)/META/misc_info.txt
-	$(hide) echo "board_avb_dtbo_add_hash_footer_args=$(BOARD_AVB_DTBO_ADD_HASH_FOOTER_ARGS)" \
+	$(hide) echo "avb_dtbo_add_hash_footer_args=$(BOARD_AVB_DTBO_ADD_HASH_FOOTER_ARGS)" >> $(zip_root)/META/misc_info.txt
+ifdef BOARD_AVB_DTBO_KEY_PATH
+	$(hide) echo "avb_dtbo_key_path=$(BOARD_AVB_DTBO_KEY_PATH)" >> $(zip_root)/META/misc_info.txt
+	$(hide) echo "avb_dtbo_algorithm=$(BOARD_AVB_DTBO_ALGORITHM)" >> $(zip_root)/META/misc_info.txt
+	$(hide) echo "avb_dtbo_rollback_index_location=$(BOARD_AVB_DTBO_ROLLBACK_INDEX_LOCATION)" \
 	    >> $(zip_root)/META/misc_info.txt
-endif
-endif
+endif # BOARD_AVB_DTBO_KEY_PATH
+endif # BOARD_AVB_ENABLE
+endif # BOARD_PREBUILT_DTBOIMAGE
 	@# Run fs_config on all the system, vendor, boot ramdisk,
 	@# and recovery ramdisk files in the zip, and save the output
 	$(hide) $(call fs_config,$(zip_root)/SYSTEM,system/) > $(zip_root)/META/filesystem_config.txt
diff --git a/core/base_rules.mk b/core/base_rules.mk
index c327d2c..07d1cd9 100644
--- a/core/base_rules.mk
+++ b/core/base_rules.mk
@@ -243,6 +243,18 @@
 intermediates.COMMON := $(call local-intermediates-dir,COMMON)
 generated_sources_dir := $(call local-generated-sources-dir)
 
+ifneq ($(LOCAL_OVERRIDES_MODULES),)
+  ifeq ($(LOCAL_MODULE_CLASS),EXECUTABLES)
+    ifndef LOCAL_IS_HOST_MODULE
+      EXECUTABLES.$(LOCAL_MODULE).OVERRIDES := $(strip $(LOCAL_OVERRIDES_MODULES))
+    else
+      $(call pretty-error,host modules cannot use LOCAL_OVERRIDES_MODULES)
+    endif
+  else
+      $(call pretty-error,LOCAL_MODULE_CLASS := $(LOCAL_MODULE_CLASS) cannot use LOCAL_OVERRIDES_MODULES)
+  endif
+endif
+
 ###########################################################
 # Pick a name for the intermediate and final targets
 ###########################################################
diff --git a/core/clang/OWNERS b/core/clang/OWNERS
new file mode 100644
index 0000000..d41d3fc
--- /dev/null
+++ b/core/clang/OWNERS
@@ -0,0 +1,4 @@
+chh@google.com
+pirama@google.com
+srhines@google.com
+yikong@google.com
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index a865597..4556fde 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -171,6 +171,7 @@
 LOCAL_ODM_MODULE:=
 LOCAL_OEM_MODULE:=
 LOCAL_OVERRIDES_PACKAGES:=
+LOCAL_OVERRIDES_MODULES:=
 LOCAL_PACKAGE_NAME:=
 LOCAL_PACKAGE_SPLITS:=
 LOCAL_PACK_MODULE_RELOCATIONS:=
diff --git a/core/local_vndk.mk b/core/local_vndk.mk
index 5ac5f26..640aac7 100644
--- a/core/local_vndk.mk
+++ b/core/local_vndk.mk
@@ -3,7 +3,7 @@
 #If LOCAL_SDK_VERSION is set, thats a more restrictive set, so they dont need LOCAL_USE_VNDK
 ifndef LOCAL_IS_HOST_MODULE
 ifndef LOCAL_SDK_VERSION
-  ifneq (,$(filter true,$(LOCAL_VENDOR_MODULE) $(LOCAL_ODM_MODULE) $(LOCAL_OEM_MODULE)))
+  ifneq (,$(filter true,$(LOCAL_VENDOR_MODULE) $(LOCAL_ODM_MODULE) $(LOCAL_OEM_MODULE) $(LOCAL_PROPRIETARY_MODULE)))
     LOCAL_USE_VNDK:=true
   else
     ifneq (,$(filter $(TARGET_OUT_VENDOR)%,$(LOCAL_MODULE_PATH) $(LOCAL_MODULE_PATH_32) $(LOCAL_MODULE_PATH_64)))
diff --git a/core/main.mk b/core/main.mk
index bc4ed04..ea72a9a 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -768,6 +768,9 @@
   # Filter out the overridden packages before doing expansion
   product_MODULES := $(filter-out $(foreach p, $(product_MODULES), \
       $(PACKAGES.$(p).OVERRIDES)), $(product_MODULES))
+  # Filter out executables as well
+  product_MODULES := $(filter-out $(foreach m, $(product_MODULES), \
+      $(EXECUTABLES.$(m).OVERRIDES)), $(product_MODULES))
 
   # Resolve the :32 :64 module name
   modules_32 := $(patsubst %:32,%,$(filter %:32, $(product_MODULES)))
diff --git a/core/tasks/tools/build_custom_image.mk b/core/tasks/tools/build_custom_image.mk
index 8c098d6..702d8b3 100644
--- a/core/tasks/tools/build_custom_image.mk
+++ b/core/tasks/tools/build_custom_image.mk
@@ -144,3 +144,9 @@
 
 # Archive the built image.
 $(call dist-for-goals, $(my_custom_image_name) custom_images,$(my_installed_custom_image))
+
+my_staging_dir :=
+my_built_modules :=
+my_copy_dest :=
+my_copy_pairs :=
+my_pickup_files :=
diff --git a/core/tasks/tools/package-modules.mk b/core/tasks/tools/package-modules.mk
index 63fab63..629a9b2 100644
--- a/core/tasks/tools/package-modules.mk
+++ b/core/tasks/tools/package-modules.mk
@@ -4,6 +4,7 @@
 # Input variables:
 #   my_modules: a list of module names
 #   my_package_name: the name of the output zip file.
+#   my_copy_pairs: a list of extra files to install (in src:dest format)
 # Output variables:
 #   my_package_zip: the path to the output zip file.
 #
@@ -11,8 +12,8 @@
 
 my_makefile := $(lastword $(filter-out $(lastword $(MAKEFILE_LIST)),$(MAKEFILE_LIST)))
 my_staging_dir := $(call intermediates-dir-for,PACKAGING,$(my_package_name))
-my_built_modules :=
-my_copy_pairs :=
+my_built_modules := $(foreach p,$(my_copy_pairs),$(call word-colon,1,$(p)))
+my_copy_pairs := $(foreach p,$(my_copy_pairs),$(call word-colon,1,$(p)):$(my_staging_dir)/$(call word-colon,2,$(p)))
 my_pickup_files :=
 
 # Iterate over the modules and include their direct dependencies stated in the
@@ -67,3 +68,12 @@
 	$(hide) $(foreach f, $(PRIVATE_PICKUP_FILES),\
 	  cp -RfL $(f) $(dir $@) && ) true
 	$(hide) cd $(dir $@) && zip -rqX $(notdir $@) *
+
+my_makefile :=
+my_staging_dir :=
+my_built_modules :=
+my_copy_dest :=
+my_copy_pairs :=
+my_pickup_files :=
+my_missing_files :=
+my_modules_and_deps :=
diff --git a/tools/OWNERS b/tools/OWNERS
new file mode 100644
index 0000000..7a23adc
--- /dev/null
+++ b/tools/OWNERS
@@ -0,0 +1,2 @@
+per-file warn.py = chh@google.com
+per-file checkowners.py = chh@google.com
diff --git a/tools/releasetools/OWNERS b/tools/releasetools/OWNERS
new file mode 100644
index 0000000..39448cf
--- /dev/null
+++ b/tools/releasetools/OWNERS
@@ -0,0 +1 @@
+tbao@google.com
diff --git a/tools/releasetools/add_img_to_target_files.py b/tools/releasetools/add_img_to_target_files.py
index 0d77be1..ff7109a 100755
--- a/tools/releasetools/add_img_to_target_files.py
+++ b/tools/releasetools/add_img_to_target_files.py
@@ -191,14 +191,14 @@
   shutil.copy(dtbo_prebuilt_path, img.name)
 
   # AVB-sign the image as needed.
-  if OPTIONS.info_dict.get("board_avb_enable") == "true":
+  if OPTIONS.info_dict.get("avb_enable") == "true":
     avbtool = os.getenv('AVBTOOL') or OPTIONS.info_dict["avb_avbtool"]
     part_size = OPTIONS.info_dict["dtbo_size"]
     # The AVB hash footer will be replaced if already present.
     cmd = [avbtool, "add_hash_footer", "--image", img.name,
            "--partition_size", str(part_size), "--partition_name", "dtbo"]
-    cmd.extend(shlex.split(OPTIONS.info_dict["avb_signing_args"]))
-    args = OPTIONS.info_dict.get("board_avb_dtbo_add_hash_footer_args")
+    common.AppendAVBSigningArgs(cmd, "dtbo")
+    args = OPTIONS.info_dict.get("avb_dtbo_add_hash_footer_args")
     if args and args.strip():
       cmd.extend(shlex.split(args))
     p = common.Run(cmd, stdout=subprocess.PIPE)
@@ -270,7 +270,7 @@
   # by the avb tool.
   is_verity_partition = "verity_block_device" in image_props
   verity_supported = (image_props.get("verity") == "true" or
-                      image_props.get("board_avb_enable") == "true")
+                      image_props.get("avb_enable") == "true")
   is_avb_enable = image_props.get("avb_hashtree_enable") == "true"
   if verity_supported and (is_verity_partition or is_avb_enable):
     adjusted_blocks_value = image_props.get("partition_size")
@@ -333,25 +333,51 @@
   img.Write()
 
 
+def AppendVBMetaArgsForPartition(cmd, partition, img_path, public_key_dir):
+  if not img_path:
+    return
+
+  # Check if chain partition is used.
+  key_path = OPTIONS.info_dict.get("avb_" + partition + "_key_path")
+  if key_path:
+    # extract public key in AVB format to be included in vbmeta.img
+    avbtool = os.getenv('AVBTOOL') or OPTIONS.info_dict["avb_avbtool"]
+    public_key_path = os.path.join(public_key_dir, "%s.avbpubkey" % partition)
+    p = common.Run([avbtool, "extract_public_key", "--key", key_path,
+                    "--output", public_key_path],
+                   stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    p.communicate()
+    assert p.returncode == 0, \
+        "avbtool extract_public_key fail for partition: %r" % partition
+
+    rollback_index_location = OPTIONS.info_dict[
+        "avb_" + partition + "_rollback_index_location"]
+    cmd.extend(["--chain_partition", "%s:%s:%s" % (
+        partition, rollback_index_location, public_key_path)])
+  else:
+    cmd.extend(["--include_descriptors_from_image", img_path])
+
+
 def AddVBMeta(output_zip, boot_img_path, system_img_path, vendor_img_path,
               dtbo_img_path, prefix="IMAGES/"):
   """Create a VBMeta image and store it in output_zip."""
   img = OutputFile(output_zip, OPTIONS.input_tmp, prefix, "vbmeta.img")
   avbtool = os.getenv('AVBTOOL') or OPTIONS.info_dict["avb_avbtool"]
-  cmd = [avbtool, "make_vbmeta_image",
-         "--output", img.name,
-         "--include_descriptors_from_image", boot_img_path,
-         "--include_descriptors_from_image", system_img_path]
-  if vendor_img_path is not None:
-    cmd.extend(["--include_descriptors_from_image", vendor_img_path])
-  if dtbo_img_path is not None:
-    cmd.extend(["--include_descriptors_from_image", dtbo_img_path])
-  if OPTIONS.info_dict.get("system_root_image") == "true":
-    cmd.extend(["--setup_rootfs_from_kernel", system_img_path])
-  cmd.extend(shlex.split(OPTIONS.info_dict["avb_signing_args"]))
-  args = OPTIONS.info_dict.get("board_avb_make_vbmeta_image_args")
+  cmd = [avbtool, "make_vbmeta_image", "--output", img.name]
+  common.AppendAVBSigningArgs(cmd, "vbmeta")
+
+  public_key_dir = tempfile.mkdtemp(prefix="avbpubkey-")
+  OPTIONS.tempfiles.append(public_key_dir)
+
+  AppendVBMetaArgsForPartition(cmd, "boot", boot_img_path, public_key_dir)
+  AppendVBMetaArgsForPartition(cmd, "system", system_img_path, public_key_dir)
+  AppendVBMetaArgsForPartition(cmd, "vendor", vendor_img_path, public_key_dir)
+  AppendVBMetaArgsForPartition(cmd, "dtbo", dtbo_img_path, public_key_dir)
+
+  args = OPTIONS.info_dict.get("avb_vbmeta_args")
   if args and args.strip():
     cmd.extend(shlex.split(args))
+
   p = common.Run(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
   p.communicate()
   assert p.returncode == 0, "avbtool make_vbmeta_image failed"
@@ -556,7 +582,7 @@
     banner("dtbo")
     dtbo_img_path = AddDtbo(output_zip)
 
-  if OPTIONS.info_dict.get("board_avb_enable") == "true":
+  if OPTIONS.info_dict.get("avb_enable") == "true":
     banner("vbmeta")
     boot_contents = boot_image.WriteToTemp()
     AddVBMeta(output_zip, boot_contents.name, system_img_path,
diff --git a/tools/releasetools/build_image.py b/tools/releasetools/build_image.py
index de75a6b..6de9763 100755
--- a/tools/releasetools/build_image.py
+++ b/tools/releasetools/build_image.py
@@ -109,18 +109,19 @@
   Returns:
     The maximum image size or 0 if an error occurred.
   """
-  cmdline = "%s add_%s_footer " % (avbtool, footer_type)
-  cmdline += "--partition_size %d " % partition_size
-  cmdline += "--calc_max_image_size "
-  cmdline += additional_args
-  (output, exit_code) = RunCommand(shlex.split(cmdline))
+  cmd =[avbtool, "add_%s_footer" % footer_type,
+        "--partition_size", partition_size, "--calc_max_image_size"]
+  cmd.extend(shlex.split(additional_args))
+
+  (output, exit_code) = RunCommand(cmd)
   if exit_code != 0:
     return 0
   else:
     return int(output)
 
 def AVBAddFooter(image_path, avbtool, footer_type, partition_size,
-                 partition_name, signing_args, additional_args):
+                 partition_name, key_path, algorithm,
+                 additional_args):
   """Adds dm-verity hashtree and AVB metadata to an image.
 
   Args:
@@ -129,19 +130,24 @@
     footer_type: 'hash' or 'hashtree' for generating footer.
     partition_size: The size of the partition in question.
     partition_name: The name of the partition - will be embedded in metadata.
-    signing_args: Arguments for signing the image.
+    key_path: Path to key to use or None.
+    algorithm: Name of algorithm to use or None.
     additional_args: Additional arguments to pass to 'avbtool
       add_hashtree_image'.
   Returns:
     True if the operation succeeded.
   """
-  cmdline = "%s add_%s_footer " % (avbtool, footer_type)
-  cmdline += "--partition_size %d " % partition_size
-  cmdline += "--partition_name %s " % partition_name
-  cmdline += "--image %s " % image_path
-  cmdline += signing_args + " "
-  cmdline += additional_args
-  (_, exit_code) = RunCommand(shlex.split(cmdline))
+  cmd =[avbtool, "add_%s_footer" % footer_type,
+        "--partition_size", partition_size,
+        "--partition_name", partition_name,
+        "--image", image_path]
+
+  if key_path and algorithm:
+    cmd.extend(["--key", key_path, "--algorithm", algorithm])
+
+  cmd.extend(shlex.split(additional_args))
+
+  (_, exit_code) = RunCommand(cmd)
   return exit_code == 0
 
 def AdjustPartitionSizeForVerity(partition_size, fec_supported):
@@ -420,8 +426,8 @@
     avb_footer_type = 'hashtree'
 
   if avb_footer_type:
-    avbtool = prop_dict.get("avb_avbtool")
-    partition_size = int(prop_dict.get("partition_size"))
+    avbtool = prop_dict["avb_avbtool"]
+    partition_size = prop_dict["partition_size"]
     # avb_add_hash_footer_args or avb_add_hashtree_footer_args.
     additional_args = prop_dict["avb_add_" + avb_footer_type + "_footer_args"]
     max_image_size = AVBCalcMaxImageSize(avbtool, avb_footer_type, partition_size,
@@ -429,7 +435,7 @@
     if max_image_size == 0:
       return False
     prop_dict["partition_size"] = str(max_image_size)
-    prop_dict["original_partition_size"] = str(partition_size)
+    prop_dict["original_partition_size"] = partition_size
 
   if fs_type.startswith("ext"):
     build_command = [prop_dict["ext_mkuserimg"]]
@@ -572,14 +578,16 @@
 
   # Add AVB HASH or HASHTREE footer (metadata).
   if avb_footer_type:
-    avbtool = prop_dict.get("avb_avbtool")
-    original_partition_size = int(prop_dict.get("original_partition_size"))
+    avbtool = prop_dict["avb_avbtool"]
+    original_partition_size = prop_dict["original_partition_size"]
     partition_name = prop_dict["partition_name"]
-    signing_args = prop_dict["avb_signing_args"]
+    # key_path and algorithm are only available when chain partition is used.
+    key_path = prop_dict.get("avb_key_path")
+    algorithm = prop_dict.get("avb_algorithm")
     # avb_add_hash_footer_args or avb_add_hashtree_footer_args
     additional_args = prop_dict["avb_add_" + avb_footer_type + "_footer_args"]
     if not AVBAddFooter(out_file, avbtool, avb_footer_type, original_partition_size,
-                      partition_name, signing_args, additional_args):
+                        partition_name, key_path, algorithm, additional_args):
       return False
 
   if run_fsck and prop_dict.get("skip_fsck") != "true":
@@ -624,8 +632,7 @@
       "verity_key",
       "verity_signer_cmd",
       "verity_fec",
-      "board_avb_enable",
-      "avb_signing_args",
+      "avb_enable",
       "avb_avbtool"
       )
   for p in common_props:
@@ -633,6 +640,11 @@
 
   d["mount_point"] = mount_point
   if mount_point == "system":
+    copy_prop("avb_system_hashtree_enable", "avb_hashtree_enable")
+    copy_prop("avb_system_add_hashtree_footer_args",
+              "avb_add_hashtree_footer_args")
+    copy_prop("avb_system_key_path", "avb_key_path")
+    copy_prop("avb_system_algorithm", "avb_algorithm")
     copy_prop("fs_type", "fs_type")
     # Copy the generic system fs type first, override with specific one if
     # available.
@@ -650,13 +662,15 @@
     copy_prop("system_squashfs_block_size", "squashfs_block_size")
     copy_prop("system_squashfs_disable_4k_align", "squashfs_disable_4k_align")
     copy_prop("system_base_fs_file", "base_fs_file")
-    copy_prop("system_avb_hashtree_enable", "avb_hashtree_enable")
-    copy_prop("system_avb_add_hashtree_footer_args",
-              "avb_add_hashtree_footer_args")
     copy_prop("system_extfs_inode_count", "extfs_inode_count")
   elif mount_point == "system_other":
     # We inherit the selinux policies of /system since we contain some of its files.
     d["mount_point"] = "system"
+    copy_prop("avb_system_hashtree_enable", "avb_hashtree_enable")
+    copy_prop("avb_system_add_hashtree_footer_args",
+              "avb_add_hashtree_footer_args")
+    copy_prop("avb_system_key_path", "avb_key_path")
+    copy_prop("avb_system_algorithm", "avb_algorithm")
     copy_prop("fs_type", "fs_type")
     copy_prop("system_fs_type", "fs_type")
     copy_prop("system_size", "partition_size")
@@ -667,9 +681,6 @@
     copy_prop("system_squashfs_compressor_opt", "squashfs_compressor_opt")
     copy_prop("system_squashfs_block_size", "squashfs_block_size")
     copy_prop("system_base_fs_file", "base_fs_file")
-    copy_prop("system_avb_hashtree_enable", "avb_hashtree_enable")
-    copy_prop("system_avb_add_hashtree_footer_args",
-              "avb_add_hashtree_footer_args")
     copy_prop("system_extfs_inode_count", "extfs_inode_count")
   elif mount_point == "data":
     # Copy the generic fs type first, override with specific one if available.
@@ -682,6 +693,11 @@
     copy_prop("cache_fs_type", "fs_type")
     copy_prop("cache_size", "partition_size")
   elif mount_point == "vendor":
+    copy_prop("avb_vendor_hashtree_enable", "avb_hashtree_enable")
+    copy_prop("avb_vendor_add_hashtree_footer_args",
+              "avb_add_hashtree_footer_args")
+    copy_prop("avb_vendor_key_path", "avb_key_path")
+    copy_prop("avb_vendor_algorithm", "avb_algorithm")
     copy_prop("vendor_fs_type", "fs_type")
     copy_prop("vendor_size", "partition_size")
     copy_prop("vendor_journal_size", "journal_size")
@@ -692,9 +708,6 @@
     copy_prop("vendor_squashfs_block_size", "squashfs_block_size")
     copy_prop("vendor_squashfs_disable_4k_align", "squashfs_disable_4k_align")
     copy_prop("vendor_base_fs_file", "base_fs_file")
-    copy_prop("vendor_avb_hashtree_enable", "avb_hashtree_enable")
-    copy_prop("vendor_avb_add_hashtree_footer_args",
-              "avb_add_hashtree_footer_args")
     copy_prop("vendor_extfs_inode_count", "extfs_inode_count")
   elif mount_point == "oem":
     copy_prop("fs_type", "fs_type")
diff --git a/tools/releasetools/common.py b/tools/releasetools/common.py
index a9a004b..c721a24 100644
--- a/tools/releasetools/common.py
+++ b/tools/releasetools/common.py
@@ -345,6 +345,15 @@
     print("%-25s = (%s) %s" % (k, type(v).__name__, v))
 
 
+def AppendAVBSigningArgs(cmd, partition):
+  """Append signing arguments for avbtool."""
+  # e.g., "--key path/to/signing_key --algorithm SHA256_RSA4096"
+  key_path = OPTIONS.info_dict.get("avb_" + partition + "_key_path")
+  algorithm = OPTIONS.info_dict.get("avb_" + partition + "_algorithm")
+  if key_path and algorithm:
+    cmd.extend(["--key", key_path, "--algorithm", algorithm])
+
+
 def _BuildBootableImage(sourcedir, fs_config_file, info_dict=None,
                         has_ramdisk=False, two_step_image=False):
   """Build a bootable image from the specified sourcedir.
@@ -480,13 +489,13 @@
     img_keyblock.close()
 
   # AVB: if enabled, calculate and add hash to boot.img.
-  if info_dict.get("board_avb_enable", None) == "true":
+  if info_dict.get("avb_enable") == "true":
     avbtool = os.getenv('AVBTOOL') or info_dict["avb_avbtool"]
     part_size = info_dict["boot_size"]
     cmd = [avbtool, "add_hash_footer", "--image", img.name,
            "--partition_size", str(part_size), "--partition_name", "boot"]
-    cmd.extend(shlex.split(info_dict["avb_signing_args"]))
-    args = info_dict.get("board_avb_boot_add_hash_footer_args")
+    AppendAVBSigningArgs(cmd, "boot")
+    args = info_dict.get("avb_boot_add_hash_footer_args")
     if args and args.strip():
       cmd.extend(shlex.split(args))
     p = Run(cmd, stdout=subprocess.PIPE)
diff --git a/tools/releasetools/ota_from_target_files.py b/tools/releasetools/ota_from_target_files.py
index 1c8fe65..1b0f68b 100755
--- a/tools/releasetools/ota_from_target_files.py
+++ b/tools/releasetools/ota_from_target_files.py
@@ -1168,7 +1168,7 @@
   # into A/B OTA package.
   target_zip = zipfile.ZipFile(target_file, "r")
   if (OPTIONS.info_dict.get("verity") == "true" or
-      OPTIONS.info_dict.get("board_avb_enable") == "true"):
+      OPTIONS.info_dict.get("avb_enable") == "true"):
     care_map_path = "META/care_map.txt"
     namelist = target_zip.namelist()
     if care_map_path in namelist:
diff --git a/tools/releasetools/test_common.py b/tools/releasetools/test_common.py
index a861346..36f256d 100644
--- a/tools/releasetools/test_common.py
+++ b/tools/releasetools/test_common.py
@@ -14,12 +14,14 @@
 # limitations under the License.
 #
 import os
+import shutil
 import tempfile
 import time
 import unittest
 import zipfile
 
 import common
+import validate_target_files
 
 
 def random_string_with_holes(size, block_size, step_size):
@@ -295,3 +297,55 @@
                    expected_mode=0o400)
     finally:
       os.remove(zip_file_name)
+
+class InstallRecoveryScriptFormatTest(unittest.TestCase):
+  """Check the format of install-recovery.sh
+
+  Its format should match between common.py and validate_target_files.py."""
+
+  def setUp(self):
+    self._tempdir = tempfile.mkdtemp()
+    # Create a dummy dict that contains the fstab info for boot&recovery.
+    self._info = {"fstab" : {}}
+    dummy_fstab = \
+        ["/dev/soc.0/by-name/boot /boot emmc defaults defaults",
+         "/dev/soc.0/by-name/recovery /recovery emmc defaults defaults"]
+    self._info["fstab"] = common.LoadRecoveryFSTab(lambda x : "\n".join(x),
+                                                   2, dummy_fstab)
+
+  def _out_tmp_sink(self, name, data, prefix="SYSTEM"):
+    loc = os.path.join(self._tempdir, prefix, name)
+    if not os.path.exists(os.path.dirname(loc)):
+      os.makedirs(os.path.dirname(loc))
+    with open(loc, "w+") as f:
+      f.write(data)
+
+  def test_full_recovery(self):
+    recovery_image = common.File("recovery.img", "recovery");
+    boot_image = common.File("boot.img", "boot");
+    self._info["full_recovery_image"] = "true"
+
+    common.MakeRecoveryPatch(self._tempdir, self._out_tmp_sink,
+                             recovery_image, boot_image, self._info)
+    validate_target_files.ValidateInstallRecoveryScript(self._tempdir,
+                                                        self._info)
+
+  def test_recovery_from_boot(self):
+    recovery_image = common.File("recovery.img", "recovery");
+    self._out_tmp_sink("recovery.img", recovery_image.data, "IMAGES")
+    boot_image = common.File("boot.img", "boot");
+    self._out_tmp_sink("boot.img", boot_image.data, "IMAGES")
+
+    common.MakeRecoveryPatch(self._tempdir, self._out_tmp_sink,
+                             recovery_image, boot_image, self._info)
+    validate_target_files.ValidateInstallRecoveryScript(self._tempdir,
+                                                        self._info)
+    # Validate 'recovery-from-boot' with bonus argument.
+    self._out_tmp_sink("etc/recovery-resource.dat", "bonus", "SYSTEM")
+    common.MakeRecoveryPatch(self._tempdir, self._out_tmp_sink,
+                             recovery_image, boot_image, self._info)
+    validate_target_files.ValidateInstallRecoveryScript(self._tempdir,
+                                                        self._info)
+
+  def tearDown(self):
+    shutil.rmtree(self._tempdir)
diff --git a/tools/releasetools/validate_target_files.py b/tools/releasetools/validate_target_files.py
index 1dd3159..8ac3322 100755
--- a/tools/releasetools/validate_target_files.py
+++ b/tools/releasetools/validate_target_files.py
@@ -26,6 +26,7 @@
 import common
 import logging
 import os.path
+import re
 import sparse_img
 import sys
 
@@ -43,13 +44,38 @@
   return sparse_img.SparseImage(path, mappath, clobbered_blocks)
 
 
-def ValidateFileConsistency(input_zip, input_tmp):
-  """Compare the files from image files and unpacked folders."""
+def _CalculateFileSha1(file_name, unpacked_name, round_up=False):
+  """Calculate the SHA-1 for a given file. Round up its size to 4K if needed."""
 
   def RoundUpTo4K(value):
     rounded_up = value + 4095
     return rounded_up - (rounded_up % 4096)
 
+  assert os.path.exists(unpacked_name)
+  with open(unpacked_name, 'r') as f:
+    file_data = f.read()
+  file_size = len(file_data)
+  if round_up:
+    file_size_rounded_up = RoundUpTo4K(file_size)
+    file_data += '\0' * (file_size_rounded_up - file_size)
+  return common.File(file_name, file_data).sha1
+
+
+def ValidateFileAgainstSha1(input_tmp, file_name, file_path, expected_sha1):
+  """Check if the file has the expected SHA-1."""
+
+  logging.info('Validating the SHA-1 of {}'.format(file_name))
+  unpacked_name = os.path.join(input_tmp, file_path)
+  assert os.path.exists(unpacked_name)
+  actual_sha1 = _CalculateFileSha1(file_name, unpacked_name, False)
+  assert actual_sha1 == expected_sha1, \
+      'SHA-1 mismatches for {}. actual {}, expected {}'.format(
+      file_name, actual_sha1, expected_sha1)
+
+
+def ValidateFileConsistency(input_zip, input_tmp):
+  """Compare the files from image files and unpacked folders."""
+
   def CheckAllFiles(which):
     logging.info('Checking %s image.', which)
     image = _GetImage(which, input_tmp)
@@ -66,12 +92,7 @@
       # The filename under unpacked directory, such as SYSTEM/bin/sh.
       unpacked_name = os.path.join(
           input_tmp, which.upper(), entry[(len(prefix) + 1):])
-      with open(unpacked_name) as f:
-        file_data = f.read()
-      file_size = len(file_data)
-      file_size_rounded_up = RoundUpTo4K(file_size)
-      file_data += '\0' * (file_size_rounded_up - file_size)
-      file_sha1 = common.File(entry, file_data).sha1
+      file_sha1 = _CalculateFileSha1(entry, unpacked_name, True)
 
       assert blocks_sha1 == file_sha1, \
           'file: %s, range: %s, blocks_sha1: %s, file_sha1: %s' % (
@@ -89,6 +110,78 @@
   # Not checking IMAGES/system_other.img since it doesn't have the map file.
 
 
+def ValidateInstallRecoveryScript(input_tmp, info_dict):
+  """Validate the SHA-1 embedded in install-recovery.sh.
+
+  install-recovery.sh is written in common.py and has the following format:
+
+  1. full recovery:
+  ...
+  if ! applypatch -c type:device:size:SHA-1; then
+  applypatch /system/etc/recovery.img type:device sha1 size && ...
+  ...
+
+  2. recovery from boot:
+  ...
+  applypatch [-b bonus_args] boot_info recovery_info recovery_sha1 \
+  recovery_size patch_info && ...
+  ...
+
+  For full recovery, we want to calculate the SHA-1 of /system/etc/recovery.img
+  and compare it against the one embedded in the script. While for recovery
+  from boot, we want to check the SHA-1 for both recovery.img and boot.img
+  under IMAGES/.
+  """
+
+  script_path = 'SYSTEM/bin/install-recovery.sh'
+  if not os.path.exists(os.path.join(input_tmp, script_path)):
+    logging.info('{} does not exist in input_tmp'.format(script_path))
+    return
+
+  logging.info('Checking {}'.format(script_path))
+  with open(os.path.join(input_tmp, script_path), 'r') as script:
+    lines = script.read().strip().split('\n')
+  assert len(lines) >= 6
+  check_cmd = re.search(r'if ! applypatch -c \w+:.+:\w+:(\w+);',
+                        lines[1].strip())
+  expected_recovery_check_sha1 = check_cmd.group(1)
+  patch_cmd = re.search(r'(applypatch.+)&&', lines[2].strip())
+  applypatch_argv = patch_cmd.group(1).strip().split()
+
+  full_recovery_image = info_dict.get("full_recovery_image") == "true"
+  if full_recovery_image:
+    assert len(applypatch_argv) == 5
+    # Check we have the same expected SHA-1 of recovery.img in both check mode
+    # and patch mode.
+    expected_recovery_sha1 = applypatch_argv[3].strip()
+    assert expected_recovery_check_sha1 == expected_recovery_sha1
+    ValidateFileAgainstSha1(input_tmp, 'recovery.img',
+        'SYSTEM/etc/recovery.img', expected_recovery_sha1)
+  else:
+    # We're patching boot.img to get recovery.img where bonus_args is optional
+    if applypatch_argv[1] == "-b":
+      assert len(applypatch_argv) == 8
+      boot_info_index = 3
+    else:
+      assert len(applypatch_argv) == 6
+      boot_info_index = 1
+
+    # boot_info: boot_type:boot_device:boot_size:boot_sha1
+    boot_info = applypatch_argv[boot_info_index].strip().split(':')
+    assert len(boot_info) == 4
+    ValidateFileAgainstSha1(input_tmp, file_name='boot.img',
+        file_path='IMAGES/boot.img', expected_sha1=boot_info[3])
+
+    recovery_sha1_index = boot_info_index + 2
+    expected_recovery_sha1 = applypatch_argv[recovery_sha1_index]
+    assert expected_recovery_check_sha1 == expected_recovery_sha1
+    ValidateFileAgainstSha1(input_tmp, file_name='recovery.img',
+        file_path='IMAGES/recovery.img',
+        expected_sha1=expected_recovery_sha1)
+
+  logging.info('Done checking {}'.format(script_path))
+
+
 def main(argv):
   def option_handler():
     return True
@@ -112,11 +205,12 @@
 
   ValidateFileConsistency(input_zip, input_tmp)
 
+  info_dict = common.LoadInfoDict(input_tmp)
+  ValidateInstallRecoveryScript(input_tmp, info_dict)
+
   # TODO: Check if the OTA keys have been properly updated (the ones on /system,
   # in recovery image).
 
-  # TODO(b/35411009): Verify the contents in /system/bin/install-recovery.sh.
-
   logging.info("Done.")