diff --git a/core/Makefile b/core/Makefile
index 6fb2458..83a008c 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -1678,11 +1678,12 @@
 
 ifeq ($(AB_OTA_UPDATER),true)
 # Build zlib fingerprint if using the AB Updater.
-$(BUILT_TARGET_FILES_PACKAGE): $(TARGET_OUT_COMMON_GEN)/zlib_fingerprint
+updater_dep := $(TARGET_OUT_COMMON_GEN)/zlib_fingerprint
 else
 # Build OTA tools if not using the AB Updater.
-$(BUILT_TARGET_FILES_PACKAGE): $(built_ota_tools)
+updater_dep := $(built_ota_tools)
 endif
+$(BUILT_TARGET_FILES_PACKAGE): $(updater_dep)
 
 # If we are using recovery as boot, output recovery files to BOOT/.
 ifeq ($(BOARD_USES_RECOVERY_AS_BOOT),true)
@@ -1705,6 +1706,7 @@
 		$(SELINUX_FC) \
 		$(APKCERTS_FILE) \
 		$(HOST_OUT_EXECUTABLES)/fs_config \
+		build/tools/releasetools/add_img_to_target_files \
 		| $(ACP)
 	@echo "Package target files: $@"
 	$(hide) rm -rf $@ $(zip_root)
@@ -1873,6 +1875,17 @@
 	@# Include the build type in META/misc_info.txt so the server can easily differentiate production builds.
 	$(hide) echo "build_type=$(TARGET_BUILD_VARIANT)" >> $(zip_root)/META/misc_info.txt
 	$(hide) echo "ab_update=true" >> $(zip_root)/META/misc_info.txt
+ifdef BRILLO_VENDOR_PARTITIONS
+	$(hide) mkdir -p $(zip_root)/VENDOR_IMAGES
+	$(hide) for f in $(BRILLO_VENDOR_PARTITIONS); do \
+	  pair1="$$(echo $$f | awk -F':' '{print $$1}')"; \
+	  pair2="$$(echo $$f | awk -F':' '{print $$2}')"; \
+	  src=$${pair1}/$${pair2}; \
+	  dest=$(zip_root)/VENDOR_IMAGES/$${pair2}; \
+	  mkdir -p $$(dirname "$${dest}"); \
+	  $(ACP) $${src} $${dest}; \
+	done;
+endif
 ifdef OSRELEASED_DIRECTORY
 	$(hide) $(ACP) $(TARGET_OUT_ETC)/$(OSRELEASED_DIRECTORY)/product_id $(zip_root)/META/product_id.txt
 	$(hide) $(ACP) $(TARGET_OUT_ETC)/$(OSRELEASED_DIRECTORY)/product_version $(zip_root)/META/product_version.txt
@@ -1923,7 +1936,8 @@
 
 $(INTERNAL_OTA_PACKAGE_TARGET): KEY_CERT_PAIR := $(DEFAULT_KEY_CERT_PAIR)
 
-$(INTERNAL_OTA_PACKAGE_TARGET): $(BUILT_TARGET_FILES_PACKAGE)
+$(INTERNAL_OTA_PACKAGE_TARGET): $(BUILT_TARGET_FILES_PACKAGE) \
+		build/tools/releasetools/ota_from_target_files
 	@echo "Package OTA: $@"
 	$(hide) PATH=$(foreach p,$(INTERNAL_USERIMAGES_BINARY_PATHS),$(p):)$$PATH MKBOOTIMG=$(MKBOOTIMG) \
 	   ./build/tools/releasetools/ota_from_target_files -v \
@@ -1949,7 +1963,8 @@
 
 INTERNAL_UPDATE_PACKAGE_TARGET := $(PRODUCT_OUT)/$(name).zip
 
-$(INTERNAL_UPDATE_PACKAGE_TARGET): $(BUILT_TARGET_FILES_PACKAGE)
+$(INTERNAL_UPDATE_PACKAGE_TARGET): $(BUILT_TARGET_FILES_PACKAGE) \
+		build/tools/releasetools/img_from_target_files
 	@echo "Package: $@"
 	$(hide) PATH=$(foreach p,$(INTERNAL_USERIMAGES_BINARY_PATHS),$(p):)$$PATH MKBOOTIMG=$(MKBOOTIMG) \
 	   ./build/tools/releasetools/img_from_target_files -v \
@@ -1972,7 +1987,11 @@
 SYMBOLS_ZIP := $(PRODUCT_OUT)/$(name).zip
 # For apps_only build we'll establish the dependency later in build/core/main.mk.
 ifndef TARGET_BUILD_APPS
-$(SYMBOLS_ZIP): $(INSTALLED_SYSTEMIMAGE) $(INSTALLED_BOOTIMAGE_TARGET)
+$(SYMBOLS_ZIP): $(INSTALLED_SYSTEMIMAGE) \
+		$(INSTALLED_BOOTIMAGE_TARGET) \
+		$(INSTALLED_USERDATAIMAGE_TARGET) \
+		$(INSTALLED_VENDORIMAGE_TARGET) \
+		$(updater_dep)
 endif
 $(SYMBOLS_ZIP):
 	@echo "Package symbols: $@"
diff --git a/core/binary.mk b/core/binary.mk
index c2e3069..4736f06 100644
--- a/core/binary.mk
+++ b/core/binary.mk
@@ -654,59 +654,57 @@
 ## Compile the .proto files to .cc (or .c) and then to .o
 ###########################################################
 proto_sources := $(filter %.proto,$(my_src_files))
-proto_generated_objects :=
-proto_generated_headers :=
 ifneq ($(proto_sources),)
-proto_generated_sources_dir := $(generated_sources_dir)/proto
-proto_generated_obj_dir := $(intermediates)/proto
+proto_gen_dir := $(generated_sources_dir)/proto
 proto_sources_fullpath := $(addprefix $(LOCAL_PATH)/, $(proto_sources))
 
+my_rename_cpp_ext :=
 ifneq (,$(filter nanopb-c nanopb-c-enable_malloc, $(LOCAL_PROTOC_OPTIMIZE_TYPE)))
 my_proto_source_suffix := .c
 my_proto_c_includes := external/nanopb-c
-my_protoc_flags := --nanopb_out=$(proto_generated_sources_dir) \
+my_protoc_flags := --nanopb_out=$(proto_gen_dir) \
     --plugin=external/nanopb-c/generator/protoc-gen-nanopb
 my_protoc_deps := $(NANOPB_SRCS) $(proto_sources_fullpath:%.proto=%.options)
 else
-my_proto_source_suffix := .cc
+my_proto_source_suffix := $(LOCAL_CPP_EXTENSION)
+ifneq ($(my_proto_source_suffix),.cc)
+# aprotoc is hardcoded to write out only .cc file.
+# We need to rename the extension to $(LOCAL_CPP_EXTENSION) if it's not .cc.
+my_rename_cpp_ext := true
+endif
 my_proto_c_includes := external/protobuf/src
 my_cflags += -DGOOGLE_PROTOBUF_NO_RTTI
-my_protoc_flags := --cpp_out=$(proto_generated_sources_dir)
+my_protoc_flags := --cpp_out=$(proto_gen_dir)
 my_protoc_deps :=
 endif
-my_proto_c_includes += $(proto_generated_sources_dir)
+my_proto_c_includes += $(proto_gen_dir)
 
-proto_generated_sources := $(addprefix $(proto_generated_sources_dir)/, \
+proto_generated_cpps := $(addprefix $(proto_gen_dir)/, \
     $(patsubst %.proto,%.pb$(my_proto_source_suffix),$(proto_sources_fullpath)))
-proto_generated_headers := $(patsubst %.pb$(my_proto_source_suffix),%.pb.h, $(proto_generated_sources))
-proto_generated_objects := $(addprefix $(proto_generated_obj_dir)/, \
-    $(patsubst %.proto,%.pb.o,$(proto_sources_fullpath)))
-$(call track-src-file-obj,$(proto_sources),$(proto_generated_objects))
 
 # Ensure the transform-proto-to-cc rule is only defined once in multilib build.
-ifndef $(my_prefix)_$(LOCAL_MODULE_CLASS)_$(LOCAL_MODULE)_proto_defined
-$(proto_generated_sources): PRIVATE_PROTO_INCLUDES := $(TOP)
-$(proto_generated_sources): PRIVATE_PROTOC_FLAGS := $(LOCAL_PROTOC_FLAGS) $(my_protoc_flags)
-$(proto_generated_sources): $(proto_generated_sources_dir)/%.pb$(my_proto_source_suffix): %.proto $(my_protoc_deps) $(PROTOC)
+ifndef $(my_host)$(LOCAL_MODULE_CLASS)_$(LOCAL_MODULE)_proto_defined
+$(proto_generated_cpps): PRIVATE_PROTO_INCLUDES := $(TOP)
+$(proto_generated_cpps): PRIVATE_PROTOC_FLAGS := $(LOCAL_PROTOC_FLAGS) $(my_protoc_flags)
+$(proto_generated_cpps): PRIVATE_RENAME_CPP_EXT := $(my_rename_cpp_ext)
+$(proto_generated_cpps): $(proto_gen_dir)/%.pb$(my_proto_source_suffix): %.proto $(my_protoc_deps) $(PROTOC)
 	$(transform-proto-to-cc)
 
-# This is just a dummy rule to make sure gmake doesn't skip updating the dependents.
-$(proto_generated_headers): $(proto_generated_sources_dir)/%.pb.h: $(proto_generated_sources_dir)/%.pb$(my_proto_source_suffix)
-	@echo "Updated header file $@."
-	$(hide) touch $@
-
-$(my_prefix)_$(LOCAL_MODULE_CLASS)_$(LOCAL_MODULE)_proto_defined := true
-endif  # transform-proto-to-cc rule included only once
-
-$(proto_generated_objects): PRIVATE_ARM_MODE := $(normal_objects_mode)
-$(proto_generated_objects): PRIVATE_ARM_CFLAGS := $(normal_objects_cflags)
-$(proto_generated_objects): $(proto_generated_obj_dir)/%.o: $(proto_generated_sources_dir)/%$(my_proto_source_suffix) $(proto_generated_headers)
-ifeq ($(my_proto_source_suffix),.c)
-	$(transform-$(PRIVATE_HOST)c-to-o)
-else
-	$(transform-$(PRIVATE_HOST)cpp-to-o)
+$(my_host)$(LOCAL_MODULE_CLASS)_$(LOCAL_MODULE)_proto_defined := true
 endif
-$(call include-depfiles-for-objs, $(proto_generated_objects))
+# Ideally we can generate the source directly into $(intermediates).
+# But many Android.mks assume the .pb.hs are in $(generated_sources_dir).
+# As a workaround, we make a copy in the $(intermediates).
+proto_intermediate_dir := $(intermediates)/proto
+proto_intermediate_cpps := $(patsubst $(proto_gen_dir)/%,$(proto_intermediate_dir)/%,\
+    $(proto_generated_cpps))
+$(proto_intermediate_cpps) : $(proto_intermediate_dir)/% : $(proto_gen_dir)/%
+	@echo "Copy: $@"
+	$(copy-file-to-target)
+	$(hide) cp $(basename $<).h $(basename $@).h
+$(call track-src-file-gen,$(proto_sources),$(proto_intermediate_cpps))
+
+my_generated_sources += $(proto_intermediate_cpps)
 
 my_c_includes += $(my_proto_c_includes)
 # Auto-export the generated proto source dir.
@@ -892,7 +890,7 @@
 dotdot_arm_objects :=
 $(foreach s,$(dotdot_arm_sources),\
   $(eval $(call compile-dotdot-cpp-file,$(s),\
-  $(yacc_cpps) $(proto_generated_headers) $(my_additional_dependencies),\
+  $(my_additional_dependencies),\
   dotdot_arm_objects)))
 $(call track-src-file-obj,$(patsubst %,%.arm,$(dotdot_arm_sources)),$(dotdot_arm_objects))
 
@@ -900,7 +898,7 @@
 dotdot_objects :=
 $(foreach s,$(dotdot_sources),\
   $(eval $(call compile-dotdot-cpp-file,$(s),\
-    $(yacc_cpps) $(proto_generated_headers) $(my_additional_dependencies),\
+    $(my_additional_dependencies),\
     dotdot_objects)))
 $(call track-src-file-obj,$(dotdot_sources),$(dotdot_objects))
 
@@ -918,7 +916,6 @@
 ifneq ($(strip $(cpp_objects)),)
 $(cpp_objects): $(intermediates)/%.o: \
     $(TOPDIR)$(LOCAL_PATH)/%$(LOCAL_CPP_EXTENSION) \
-    $(yacc_cpps) $(proto_generated_headers) \
     $(my_additional_dependencies)
 	$(transform-$(PRIVATE_HOST)cpp-to-o)
 $(call include-depfiles-for-objs, $(cpp_objects))
@@ -940,8 +937,7 @@
 $(gen_cpp_objects): PRIVATE_ARM_MODE := $(normal_objects_mode)
 $(gen_cpp_objects): PRIVATE_ARM_CFLAGS := $(normal_objects_cflags)
 $(gen_cpp_objects): $(intermediates)/%.o: \
-    $(intermediates)/%$(LOCAL_CPP_EXTENSION) $(yacc_cpps) \
-    $(proto_generated_headers) \
+    $(intermediates)/%$(LOCAL_CPP_EXTENSION) \
     $(my_additional_dependencies)
 	$(transform-$(PRIVATE_HOST)cpp-to-o)
 $(call include-depfiles-for-objs, $(gen_cpp_objects))
@@ -996,7 +992,7 @@
 dotdot_arm_objects :=
 $(foreach s,$(dotdot_arm_sources),\
   $(eval $(call compile-dotdot-c-file,$(s),\
-    $(yacc_cpps) $(proto_generated_headers) $(my_additional_dependencies),\
+    $(my_additional_dependencies),\
     dotdot_arm_objects)))
 $(call track-src-file-obj,$(patsubst %,%.arm,$(dotdot_arm_sources)),$(dotdot_arm_objects))
 
@@ -1004,7 +1000,7 @@
 dotdot_objects :=
 $(foreach s, $(dotdot_sources),\
   $(eval $(call compile-dotdot-c-file,$(s),\
-    $(yacc_cpps) $(proto_generated_headers) $(my_additional_dependencies),\
+    $(my_additional_dependencies),\
     dotdot_objects)))
 $(call track-src-file-obj,$(dotdot_sources),$(dotdot_objects))
 
@@ -1020,7 +1016,7 @@
 c_objects        := $(c_arm_objects) $(c_normal_objects)
 
 ifneq ($(strip $(c_objects)),)
-$(c_objects): $(intermediates)/%.o: $(TOPDIR)$(LOCAL_PATH)/%.c $(yacc_cpps) $(proto_generated_headers) \
+$(c_objects): $(intermediates)/%.o: $(TOPDIR)$(LOCAL_PATH)/%.c \
     $(my_additional_dependencies)
 	$(transform-$(PRIVATE_HOST)c-to-o)
 $(call include-depfiles-for-objs, $(c_objects))
@@ -1041,7 +1037,7 @@
 # TODO: support compiling certain generated files as arm.
 $(gen_c_objects): PRIVATE_ARM_MODE := $(normal_objects_mode)
 $(gen_c_objects): PRIVATE_ARM_CFLAGS := $(normal_objects_cflags)
-$(gen_c_objects): $(intermediates)/%.o: $(intermediates)/%.c $(yacc_cpps) $(proto_generated_headers) \
+$(gen_c_objects): $(intermediates)/%.o: $(intermediates)/%.c \
     $(my_additional_dependencies)
 	$(transform-$(PRIVATE_HOST)c-to-o)
 $(call include-depfiles-for-objs, $(gen_c_objects))
@@ -1056,7 +1052,7 @@
 $(call track-src-file-obj,$(objc_sources),$(objc_objects))
 
 ifneq ($(strip $(objc_objects)),)
-$(objc_objects): $(intermediates)/%.o: $(TOPDIR)$(LOCAL_PATH)/%.m $(yacc_cpps) $(proto_generated_headers) \
+$(objc_objects): $(intermediates)/%.o: $(TOPDIR)$(LOCAL_PATH)/%.m \
     $(my_additional_dependencies)
 	$(transform-$(PRIVATE_HOST)m-to-o)
 $(call include-depfiles-for-objs, $(objc_objects))
@@ -1071,7 +1067,7 @@
 $(call track-src-file-obj,$(objcpp_sources),$(objcpp_objects))
 
 ifneq ($(strip $(objcpp_objects)),)
-$(objcpp_objects): $(intermediates)/%.o: $(TOPDIR)$(LOCAL_PATH)/%.mm $(yacc_cpps) $(proto_generated_headers) \
+$(objcpp_objects): $(intermediates)/%.o: $(TOPDIR)$(LOCAL_PATH)/%.mm \
     $(my_additional_dependencies)
 	$(transform-$(PRIVATE_HOST)mm-to-o)
 $(call include-depfiles-for-objs, $(objcpp_objects))
@@ -1201,8 +1197,7 @@
     $(c_objects) \
     $(gen_c_objects) \
     $(objc_objects) \
-    $(objcpp_objects) \
-    $(proto_generated_objects)
+    $(objcpp_objects)
 
 new_order_normal_objects := $(foreach f,$(my_src_files),$(my_src_file_obj_$(f)))
 new_order_normal_objects += $(foreach f,$(my_gen_src_files),$(my_src_file_obj_$(f)))
@@ -1483,11 +1478,9 @@
    $(foreach l,$(LOCAL_EXPORT_STATIC_LIBRARY_HEADERS), \
      $(call intermediates-dir-for,STATIC_LIBRARIES,$(l),$(LOCAL_IS_HOST_MODULE),,$(LOCAL_2ND_ARCH_VAR_PREFIX),$(my_host_cross))/export_includes))
 $(export_includes): PRIVATE_REEXPORTED_INCLUDES := $(export_include_deps)
-# Make sure .pb.h are already generated before any dependent source files get compiled.
-# Similarly, the generated DBus headers need to exist before we export their location.
-# People are not going to consume the aidl generated cpp file, but the cpp file is
-# generated after the headers, so this is a convenient way to ensure the headers exist.
-$(export_includes) : $(proto_generated_headers) $(dbus_generated_headers) $(aidl_gen_cpp) $(export_include_deps)
+# By adding $(my_generated_sources) it makes sure the headers get generated
+# before any dependent source files get compiled.
+$(export_includes) : $(my_generated_sources) $(export_include_deps)
 	@echo Export includes file: $< -- $@
 	$(hide) mkdir -p $(dir $@) && rm -f $@.tmp && touch $@.tmp
 ifdef my_export_c_include_dirs
diff --git a/core/build-system.html b/core/build-system.html
index bddde6a..95f35ce 100644
--- a/core/build-system.html
+++ b/core/build-system.html
@@ -438,7 +438,7 @@
 GEN := $(intermediates)/<font color=red>file.c</font>
 $(GEN): PRIVATE_INPUT_FILE := $(LOCAL_PATH)/<font color=red>input.file</font>
 $(GEN): PRIVATE_CUSTOM_TOOL = <font color=red>cat $(PRIVATE_INPUT_FILE) &gt; $@</font>
-$(GEN): <font color=red>$(LOCAL_PATH)/file.c</font>
+$(GEN): <font color=red>$(LOCAL_PATH)/input.file</font>
 	$(transform-generated-source)
 LOCAL_GENERATED_SOURCES += $(GEN)
 </pre>
diff --git a/core/clang/HOST_x86_common.mk b/core/clang/HOST_x86_common.mk
index 0f4d4a2..1344eae 100644
--- a/core/clang/HOST_x86_common.mk
+++ b/core/clang/HOST_x86_common.mk
@@ -13,7 +13,8 @@
 ifeq ($(HOST_OS),linux)
 CLANG_CONFIG_x86_LINUX_HOST_EXTRA_ASFLAGS := \
   --gcc-toolchain=$($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG) \
-  --sysroot $($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/sysroot
+  --sysroot $($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/sysroot \
+  -B$($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)/x86_64-linux/bin
 
 CLANG_CONFIG_x86_LINUX_HOST_EXTRA_CFLAGS := \
   --gcc-toolchain=$($(clang_2nd_arch_prefix)HOST_TOOLCHAIN_FOR_CLANG)
diff --git a/core/clang/arm.mk b/core/clang/arm.mk
index 4053bb2..a5472f4 100644
--- a/core/clang/arm.mk
+++ b/core/clang/arm.mk
@@ -4,12 +4,6 @@
 
 CLANG_CONFIG_arm_EXTRA_CFLAGS :=
 
-ifneq (,$(filter krait,$(TARGET_$(combo_2nd_arch_prefix)CPU_VARIANT)))
-  # Android's clang support's krait as a CPU whereas GCC doesn't. Specify
-  # -mcpu here rather than the more normal core/combo/arch/arm/armv7-a-neon.mk.
-  CLANG_CONFIG_arm_EXTRA_CFLAGS += -mcpu=krait -mfpu=neon-vfpv4
-endif
-
 CLANG_CONFIG_arm_EXTRA_CPPFLAGS :=
 
 CLANG_CONFIG_arm_EXTRA_LDFLAGS :=
@@ -31,6 +25,15 @@
   -fno-tree-copy-prop \
   -fno-tree-loop-optimize
 
+ifneq (,$(filter krait,$(TARGET_$(combo_2nd_arch_prefix)CPU_VARIANT)))
+  # Android's clang support's krait as a CPU whereas GCC doesn't. Specify
+  # -mcpu here rather than the more normal core/combo/arch/arm/armv7-a-neon.mk.
+  CLANG_CONFIG_arm_EXTRA_CFLAGS += -mcpu=krait -mfpu=neon-vfpv4
+
+  # This isn't really unknown, but allows us to only set -mcpu=krait
+  CLANG_CONFIG_arm_UNKNOWN_CFLAGS += -mcpu=cortex-a15
+endif
+
 define subst-clang-incompatible-arm-flags
   $(subst -march=armv5te,-march=armv5t,\
   $(subst -march=armv5e,-march=armv5,\
diff --git a/core/clang/mips.mk b/core/clang/mips.mk
index 4a8f812..aeb2f6a 100644
--- a/core/clang/mips.mk
+++ b/core/clang/mips.mk
@@ -15,11 +15,6 @@
   -mno-synci \
   -mno-fused-madd
 
-# Temporary workaround for Mips clang++ problem,  creates
-#   relocated ptrs in read-only pic .gcc_exception_table;
-#   permanent fix pending at http://reviews.llvm.org/D9669
-CLANG_CONFIG_mips_UNKNOWN_CFLAGS += -Wl,--warn-shared-textrel
-
 # We don't have any mips flags to substitute yet.
 define subst-clang-incompatible-mips-flags
   $(1)
diff --git a/core/clang/mips64.mk b/core/clang/mips64.mk
index 1b72e05..20e87bd 100644
--- a/core/clang/mips64.mk
+++ b/core/clang/mips64.mk
@@ -15,11 +15,6 @@
   -mno-synci \
   -mno-fused-madd
 
-# Temporary workaround for Mips clang++ problem creating
-#   relocated ptrs in read-only pic .gcc_exception_table;
-#   permanent fix pending at http://reviews.llvm.org/D9669
-CLANG_CONFIG_mips64_UNKNOWN_CFLAGS += -Wl,--warn-shared-textrel
-
 # We don't have any mips64 flags to substitute yet.
 define subst-clang-incompatible-mips64-flags
   $(1)
diff --git a/core/clang/tidy.mk b/core/clang/tidy.mk
index e61b878..019e6f0 100644
--- a/core/clang/tidy.mk
+++ b/core/clang/tidy.mk
@@ -15,22 +15,25 @@
 #
 
 # Most Android source files are not clang-tidy clean yet.
-# Global tidy checks include only google* minus google-readability*.
+# Global tidy checks include only google* and misc-macro-parentheses,
+# but not google-readability*.
 DEFAULT_GLOBAL_TIDY_CHECKS := \
-  -*,google*,-google-readability*
+  -*,google*,-google-readability*,misc-macro-parentheses
 
-# Disable google style rules usually not followed by external projects.
+# Disable style rules usually not followed by external projects.
 # Every word in DEFAULT_LOCAL_TIDY_CHECKS list has the following format:
 #   <local_path_prefix>:,<tidy-check-pattern>
 # The tidy-check-patterns of all matching local_path_prefixes will be used.
 # For example, external/google* projects will have:
 #   ,-google-build-using-namespace,-google-explicit-constructor
-#   ,-google-runtime-int,google-runtime-int
-# where google-runtime-int is enabled at the end.
+#   ,-google-runtime-int,-misc-macro-parentheses,
+#   ,google-runtime-int,misc-macro-parentheses
+# where google-runtime-int and misc-macro-parentheses are enabled at the end.
 DEFAULT_LOCAL_TIDY_CHECKS := \
   external/:,-google-build-using-namespace \
   external/:,-google-explicit-constructor,-google-runtime-int \
-  external/google:,google-runtime-int \
+  external/:,-misc-macro-parentheses \
+  external/google:,google-runtime-int,misc-macro-parentheses \
   external/webrtc/:,google-runtime-int \
   hardware/qcom:,-google-build-using-namespace \
   hardware/qcom:,-google-explicit-constructor,-google-runtime-int \
diff --git a/core/combo/TARGET_linux-arm.mk b/core/combo/TARGET_linux-arm.mk
index d89a2cf..9be6c73 100644
--- a/core/combo/TARGET_linux-arm.mk
+++ b/core/combo/TARGET_linux-arm.mk
@@ -119,16 +119,6 @@
 			-fno-strict-volatile-bitfields
 endif
 
-# This is to avoid the dreaded warning compiler message:
-#   note: the mangling of 'va_list' has changed in GCC 4.4
-#
-# The fact that the mangling changed does not affect the NDK ABI
-# very fortunately (since none of the exposed APIs used va_list
-# in their exported C++ functions). Also, GCC 4.5 has already
-# removed the warning from the compiler.
-#
-$(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS += -Wno-psabi
-
 $(combo_2nd_arch_prefix)TARGET_GLOBAL_LDFLAGS += \
 			-Wl,-z,noexecstack \
 			-Wl,-z,relro \
diff --git a/core/combo/TARGET_linux-arm64.mk b/core/combo/TARGET_linux-arm64.mk
index 9ff4981..61028c4 100644
--- a/core/combo/TARGET_linux-arm64.mk
+++ b/core/combo/TARGET_linux-arm64.mk
@@ -95,16 +95,6 @@
 
 TARGET_GLOBAL_CFLAGS += -fno-strict-volatile-bitfields
 
-# This is to avoid the dreaded warning compiler message:
-#   note: the mangling of 'va_list' has changed in GCC 4.4
-#
-# The fact that the mangling changed does not affect the NDK ABI
-# very fortunately (since none of the exposed APIs used va_list
-# in their exported C++ functions). Also, GCC 4.5 has already
-# removed the warning from the compiler.
-#
-TARGET_GLOBAL_CFLAGS += -Wno-psabi
-
 TARGET_GLOBAL_LDFLAGS += \
 			-Wl,-z,noexecstack \
 			-Wl,-z,relro \
diff --git a/core/combo/arch/arm/armv7-a-neon.mk b/core/combo/arch/arm/armv7-a-neon.mk
index 5d5b050..5517a79 100644
--- a/core/combo/arch/arm/armv7-a-neon.mk
+++ b/core/combo/arch/arm/armv7-a-neon.mk
@@ -31,6 +31,11 @@
 	arch_variant_ldflags := \
 		-Wl,--no-fix-cortex-a8
 else
+ifeq ($(strip $(TARGET_$(combo_2nd_arch_prefix)CPU_VARIANT)),cortex-a9)
+	arch_variant_cflags := -march=armv7-a
+	arch_variant_ldflags := \
+		-Wl,--no-fix-cortex-a8
+else
 	arch_variant_cflags := -march=armv7-a
 	# Generic ARM might be a Cortex A8 -- better safe than sorry
 	arch_variant_ldflags := \
@@ -38,6 +43,7 @@
 endif
 endif
 endif
+endif
 
 ifeq (true,$(local_arch_has_lpae))
 	# Fake an ARM compiler flag as these processors support LPAE which GCC/clang
diff --git a/core/combo/arch/x86/x86_64.mk b/core/combo/arch/x86/x86_64.mk
new file mode 100644
index 0000000..620fbd8
--- /dev/null
+++ b/core/combo/arch/x86/x86_64.mk
@@ -0,0 +1,18 @@
+# This file is used as the second (32-bit) architecture when building a generic
+# x86_64 64-bit platform image. (full_x86_64-eng / sdk_x86_64-eng)
+#
+# The generic 'x86' variant cannot be used, since it resets some flags used
+# by the 'x86_64' variant.
+
+ARCH_X86_HAVE_SSSE3 := true
+ARCH_X86_HAVE_MOVBE := false # Only supported on Atom.
+ARCH_X86_HAVE_POPCNT := true
+ARCH_X86_HAVE_SSE4 := true
+ARCH_X86_HAVE_SSE4_1 := true
+ARCH_X86_HAVE_SSE4_2 := true
+
+
+# Some intrinsic functions used by libcxx only exist for prescott or newer CPUs.
+arch_variant_cflags := \
+    -march=prescott \
+
diff --git a/core/definitions.mk b/core/definitions.mk
index 664d86b..d5840b8 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -402,7 +402,7 @@
 
 define find-subdir-assets
 $(sort $(if $(1),$(patsubst ./%,%, \
-	$(shell if [ -d $(1) ] ; then cd $(1) ; find ./ -not -name '.*' -and -type f -and -not -type l ; fi)), \
+	$(shell if [ -d $(1) ] ; then cd $(1) ; find -L ./ -not -name '.*' -and -type f ; fi)), \
 	$(warning Empty argument supplied to find-subdir-assets) \
 ))
 endef
@@ -1109,6 +1109,9 @@
 	$(addprefix --proto_path=, $(PRIVATE_PROTO_INCLUDES)) \
 	$(PRIVATE_PROTOC_FLAGS) \
 	$<
+@# aprotoc outputs only .cc. Rename it to .cpp if necessary.
+$(if $(PRIVATE_RENAME_CPP_EXT),\
+  $(hide) mv $(basename $@).cc $@)
 endef
 
 
diff --git a/core/host_test_internal.mk b/core/host_test_internal.mk
index e4fa4c5..6c52e64 100644
--- a/core/host_test_internal.mk
+++ b/core/host_test_internal.mk
@@ -5,7 +5,7 @@
 LOCAL_CFLAGS_windows += -DGTEST_OS_WINDOWS
 LOCAL_CFLAGS_linux += -DGTEST_OS_LINUX
 LOCAL_LDLIBS_linux += -lpthread
-LOCAL_CFLAGS_darwin += -DGTEST_OS_LINUX
+LOCAL_CFLAGS_darwin += -DGTEST_OS_MAC
 LOCAL_LDLIBS_darwin += -lpthread
 
 LOCAL_CFLAGS += -DGTEST_HAS_STD_STRING -O0 -g
diff --git a/core/main.mk b/core/main.mk
index 5834cd5..3309981 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -110,6 +110,8 @@
 include build/core/ninja.mk
 else # KATI
 
+include $(SOONG_MAKEVARS_MK)
+
 # Write the build number to a file so it can be read back in
 # without changing the command line every time.  Avoids rebuilds
 # when using ninja.
diff --git a/core/ninja.mk b/core/ninja.mk
index 8a94f39..5136f4e 100644
--- a/core/ninja.mk
+++ b/core/ninja.mk
@@ -104,13 +104,15 @@
 NINJA_STATUS := [%p %s/%t]$(space)
 endif
 
+NINJA_EXTRA_ARGS :=
+
 ifneq (,$(filter showcommands,$(ORIGINAL_MAKECMDGOALS)))
-NINJA_ARGS += "-v"
+NINJA_EXTRA_ARGS += "-v"
 endif
 
 # Make multiple rules to generate the same target an error instead of
 # proceeding with undefined behavior.
-NINJA_ARGS += -w dupbuild=err
+NINJA_EXTRA_ARGS += -w dupbuild=err
 
 ifdef USE_GOMA
 KATI_MAKEPARALLEL := $(MAKEPARALLEL)
@@ -118,11 +120,13 @@
 # this parallelism. Note the parallelism of all other jobs is still
 # limited by the -j flag passed to GNU make.
 NINJA_REMOTE_NUM_JOBS ?= 500
-NINJA_ARGS += -j$(NINJA_REMOTE_NUM_JOBS)
+NINJA_EXTRA_ARGS += -j$(NINJA_REMOTE_NUM_JOBS)
 else
 NINJA_MAKEPARALLEL := $(MAKEPARALLEL) --ninja
 endif
 
+NINJA_ARGS += $(NINJA_EXTRA_ARGS)
+
 ifeq ($(USE_SOONG),true)
 COMBINED_BUILD_NINJA := $(OUT_DIR)/combined$(KATI_NINJA_SUFFIX).ninja
 
@@ -155,7 +159,7 @@
 endif
 $(KATI_BUILD_NINJA): $(CKATI) $(MAKEPARALLEL) $(DUMMY_OUT_MKS) run_soong FORCE
 	@echo Running kati to generate build$(KATI_NINJA_SUFFIX).ninja...
-	+$(hide) $(KATI_MAKEPARALLEL) $(CKATI) --ninja --ninja_dir=$(OUT_DIR) --ninja_suffix=$(KATI_NINJA_SUFFIX) --regen --ignore_dirty=$(OUT_DIR)/% --no_ignore_dirty=$(SOONG_ANDROID_MK) --ignore_optional_include=$(OUT_DIR)/%.P --detect_android_echo $(KATI_FIND_EMULATOR) -f build/core/main.mk $(KATI_GOALS) --gen_all_targets BUILDING_WITH_NINJA=true SOONG_ANDROID_MK=$(SOONG_ANDROID_MK)
+	+$(hide) $(KATI_MAKEPARALLEL) $(CKATI) --ninja --ninja_dir=$(OUT_DIR) --ninja_suffix=$(KATI_NINJA_SUFFIX) --regen --ignore_dirty=$(OUT_DIR)/% --no_ignore_dirty=$(SOONG_ANDROID_MK) --no_ignore_dirty=$(SOONG_MAKEVARS_MK) --ignore_optional_include=$(OUT_DIR)/%.P --detect_android_echo $(KATI_FIND_EMULATOR) -f build/core/main.mk $(KATI_GOALS) --gen_all_targets BUILDING_WITH_NINJA=true SOONG_ANDROID_MK=$(SOONG_ANDROID_MK) SOONG_MAKEVARS_MK=$(SOONG_MAKEVARS_MK)
 
 .PHONY: FORCE
 FORCE:
diff --git a/core/soong.mk b/core/soong.mk
index 3450695..ebcccd3 100644
--- a/core/soong.mk
+++ b/core/soong.mk
@@ -3,12 +3,13 @@
 SOONG_BOOTSTRAP := $(SOONG_OUT_DIR)/.soong.bootstrap
 SOONG_BUILD_NINJA := $(SOONG_OUT_DIR)/build.ninja
 SOONG_IN_MAKE := $(SOONG_OUT_DIR)/.soong.in_make
+SOONG_MAKEVARS_MK := $(SOONG_OUT_DIR)/make_vars-$(TARGET_PRODUCT).mk
 SOONG_VARIABLES := $(SOONG_OUT_DIR)/soong.variables
 
 # Only include the Soong-generated Android.mk if we're merging the
 # Soong-defined binaries with Kati-defined binaries.
 ifeq ($(USE_SOONG),true)
-SOONG_ANDROID_MK := $(SOONG_OUT_DIR)/Android.mk
+SOONG_ANDROID_MK := $(SOONG_OUT_DIR)/Android-$(TARGET_PRODUCT).mk
 endif
 
 # We need to rebootstrap soong if SOONG_OUT_DIR or the reverse path from
@@ -37,6 +38,8 @@
 	$(hide) mkdir -p $(dir $@)
 	$(hide) (\
 	echo '{'; \
+	echo '    "Make_suffix": "-$(TARGET_PRODUCT)",'; \
+	echo ''; \
 	echo '    "Platform_sdk_version": $(PLATFORM_SDK_VERSION),'; \
 	echo '    "Unbundled_build": $(if $(TARGET_BUILD_APPS),true,false),'; \
 	echo '    "Brillo": $(if $(BRILLO),true,false),'; \
@@ -62,7 +65,8 @@
 	echo ''; \
 	echo '    "CrossHost": "$(HOST_CROSS_OS)",'; \
 	echo '    "CrossHostArch": "$(HOST_CROSS_ARCH)",'; \
-	echo '    "CrossHostSecondaryArch": "$(HOST_CROSS_2ND_ARCH)"'; \
+	echo '    "CrossHostSecondaryArch": "$(HOST_CROSS_2ND_ARCH)",'; \
+	echo '    "Safestack": $(if $(filter true,$(USE_SAFESTACK)),true,false)'; \
 	echo '}') > $(SOONG_VARIABLES_TMP); \
 	if ! cmp -s $(SOONG_VARIABLES_TMP) $(SOONG_VARIABLES); then \
 	  mv $(SOONG_VARIABLES_TMP) $(SOONG_VARIABLES); \
@@ -79,4 +83,4 @@
 # prebuilts.
 .PHONY: run_soong
 run_soong: $(SOONG_BOOTSTRAP) $(SOONG_VARIABLES) $(SOONG_IN_MAKE) FORCE
-	$(hide) $(SOONG) $(SOONG_BUILD_NINJA) $(NINJA_ARGS)
+	$(hide) $(SOONG) $(SOONG_BUILD_NINJA) $(NINJA_EXTRA_ARGS)
diff --git a/target/board/generic_x86_64/BoardConfig.mk b/target/board/generic_x86_64/BoardConfig.mk
index 783fc77..0946243 100755
--- a/target/board/generic_x86_64/BoardConfig.mk
+++ b/target/board/generic_x86_64/BoardConfig.mk
@@ -13,7 +13,7 @@
 
 TARGET_2ND_CPU_ABI := x86
 TARGET_2ND_ARCH := x86
-TARGET_2ND_ARCH_VARIANT := x86
+TARGET_2ND_ARCH_VARIANT := x86_64
 
 TARGET_USES_64_BIT_BINDER := true
 
diff --git a/tools/apksigner/Android.mk b/tools/apksigner/Android.mk
new file mode 100644
index 0000000..a7b4414
--- /dev/null
+++ b/tools/apksigner/Android.mk
@@ -0,0 +1,19 @@
+#
+# Copyright (C) 2016 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+LOCAL_PATH := $(call my-dir)
+
+include $(call all-makefiles-under,$(LOCAL_PATH))
diff --git a/tools/apksigner/core/Android.mk b/tools/apksigner/core/Android.mk
new file mode 100644
index 0000000..c86208b
--- /dev/null
+++ b/tools/apksigner/core/Android.mk
@@ -0,0 +1,26 @@
+#
+# Copyright (C) 2016 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+LOCAL_PATH := $(call my-dir)
+
+# apksigner library, for signing APKs and verification signatures of APKs
+# ============================================================
+include $(CLEAR_VARS)
+LOCAL_MODULE := apksigner-core
+LOCAL_SRC_FILES := $(call all-java-files-under, src)
+LOCAL_JAVA_LIBRARIES = \
+  bouncycastle-host \
+  bouncycastle-bcpkix-host
+include $(BUILD_HOST_JAVA_LIBRARY)
diff --git a/tools/apksigner/core/src/com/android/apksigner/core/ApkSignerEngine.java b/tools/apksigner/core/src/com/android/apksigner/core/ApkSignerEngine.java
new file mode 100644
index 0000000..36f2a08
--- /dev/null
+++ b/tools/apksigner/core/src/com/android/apksigner/core/ApkSignerEngine.java
@@ -0,0 +1,407 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.apksigner.core;
+
+import java.io.Closeable;
+import java.io.IOException;
+import java.security.InvalidKeyException;
+import java.security.SignatureException;
+import java.util.List;
+
+import com.android.apksigner.core.util.DataSink;
+import com.android.apksigner.core.util.DataSource;
+
+/**
+ * APK signing logic which is independent of how input and output APKs are stored, parsed, and
+ * generated.
+ *
+ * <p><h3>Operating Model</h3>
+ *
+ * The abstract operating model is that there is an input APK which is being signed, thus producing
+ * an output APK. In reality, there may be just an output APK being built from scratch, or the input APK and
+ * the output APK may be the same file. Because this engine does not deal with reading and writing
+ * files, it can handle all of these scenarios.
+ *
+ * <p>The engine is stateful and thus cannot be used for signing multiple APKs. However, once
+ * the engine signed an APK, the engine can be used to re-sign the APK after it has been modified.
+ * This may be more efficient than signing the APK using a new instance of the engine. See
+ * <a href="#incremental">Incremental Operation</a>.
+ *
+ * <p>In the engine's operating model, a signed APK is produced as follows.
+ * <ol>
+ * <li>JAR entries to be signed are output,</li>
+ * <li>JAR archive is signed using JAR signing, thus adding the so-called v1 signature to the
+ *     output,</li>
+ * <li>JAR archive is signed using APK Signature Scheme v2, thus adding the so-called v2 signature
+ *     to the output.</li>
+ * </ol>
+ *
+ * <p>The input APK may contain JAR entries which, depending on the engine's configuration, may or
+ * may not be output (e.g., existing signatures may need to be preserved or stripped) or which the
+ * engine will overwrite as part of signing. The engine thus offers {@link #inputJarEntry(String)}
+ * which tells the client whether the input JAR entry needs to be output. This avoids the need for
+ * the client to hard-code the aspects of APK signing which determine which parts of input must be
+ * ignored. Similarly, the engine offers {@link #inputApkSigningBlock(DataSource)} to help the
+ * client avoid dealing with preserving or stripping APK Signature Scheme v2 signature of the input
+ * APK.
+ *
+ * <p>To use the engine to sign an input APK (or a collection of JAR entries), follow these
+ * steps:
+ * <ol>
+ * <li>Obtain a new instance of the engine -- engine instances are stateful and thus cannot be used
+ *     for signing multiple APKs.</li>
+ * <li>Locate the input APK's APK Signing Block and provide it to
+ *     {@link #inputApkSigningBlock(DataSource)}.</li>
+ * <li>For each JAR entry in the input APK, invoke {@link #inputJarEntry(String)} to determine
+ *     whether this entry should be output. The engine may request to inspect the entry.</li>
+ * <li>For each output JAR entry, invoke {@link #outputJarEntry(String)} which may request to
+ *     inspect the entry.</li>
+ * <li>Once all JAR entries have been output, invoke {@link #outputJarEntries()} which may request
+ *     that additional JAR entries are output. These entries comprise the output APK's JAR
+ *     signature.</li>
+ * <li>Locate the ZIP Central Directory and ZIP End of Central Directory sections in the output and
+ *     invoke {@link #outputZipSections(DataSource, DataSource, DataSource)} which may request that
+ *     an APK Signature Block is inserted before the ZIP Central Directory. The block contains the
+ *     output APK's APK Signature Scheme v2 signature.</li>
+ * <li>Invoke {@link #outputDone()} to signal that the APK was output in full. The engine will
+ *     confirm that the output APK is signed.</li>
+ * <li>Invoke {@link #close()} to signal that the engine will no longer be used. This lets the
+ *     engine free any resources it no longer needs.
+ * </ol>
+ *
+ * <p>Some invocations of the engine may provide the client with a task to perform. The client is
+ * expected to perform all requested tasks before proceeding to the next stage of signing. See
+ * documentation of each method about the deadlines for performing the tasks requested by the
+ * method.
+ *
+ * <p><h3 id="incremental">Incremental Operation</h3></a>
+ *
+ * The engine supports incremental operation where a signed APK is produced, then modified and
+ * re-signed. This may be useful for IDEs, where an app is frequently re-signed after small changes
+ * by the developer. Re-signing may be more efficient than signing from scratch.
+ *
+ * <p>To use the engine in incremental mode, keep notifying the engine of changes to the APK through
+ * {@link #inputApkSigningBlock(DataSource)}, {@link #inputJarEntry(String)},
+ * {@link #inputJarEntryRemoved(String)}, {@link #outputJarEntry(String)},
+ * and {@link #outputJarEntryRemoved(String)}, perform the tasks requested by the engine through
+ * these methods, and, when a new signed APK is desired, run through steps 5 onwards to re-sign the
+ * APK.
+ *
+ * <p><h3>Output-only Operation</h3>
+ *
+ * The engine's abstract operating model consists of an input APK and an output APK. However, it is
+ * possible to use the engine in output-only mode where the engine's {@code input...} methods are
+ * not invoked. In this mode, the engine has less control over output because it cannot request that
+ * some JAR entries are not output. Nevertheless, the engine will attempt to make the output APK
+ * signed and will report an error if cannot do so.
+ */
+public interface ApkSignerEngine extends Closeable {
+
+    /**
+     * Indicates to this engine that the input APK contains the provided APK Signing Block. The
+     * block may contain signatures of the input APK, such as APK Signature Scheme v2 signatures.
+     *
+     * @param apkSigningBlock APK signing block of the input APK. The provided data source is
+     *        guaranteed to not be used by the engine after this method terminates.
+     *
+     * @throws IllegalStateException if this engine is closed
+     */
+    void inputApkSigningBlock(DataSource apkSigningBlock) throws IllegalStateException;
+
+    /**
+     * Indicates to this engine that the specified JAR entry was encountered in the input APK.
+     *
+     * <p>When an input entry is updated/changed, it's OK to not invoke
+     * {@link #inputJarEntryRemoved(String)} before invoking this method.
+     *
+     * @return instructions about how to proceed with this entry
+     *
+     * @throws IllegalStateException if this engine is closed
+     */
+    InputJarEntryInstructions inputJarEntry(String entryName) throws IllegalStateException;
+
+    /**
+     * Indicates to this engine that the specified JAR entry was output.
+     *
+     * <p>It is unnecessary to invoke this method for entries added to output by this engine (e.g.,
+     * requested by {@link #outputJarEntries()}) provided the entries were output with exactly the
+     * data requested by the engine.
+     *
+     * <p>When an already output entry is updated/changed, it's OK to not invoke
+     * {@link #outputJarEntryRemoved(String)} before invoking this method.
+     *
+     * @return request to inspect the entry or {@code null} if the engine does not need to inspect
+     *         the entry. The request must be fulfilled before {@link #outputJarEntries()} is
+     *         invoked.
+     *
+     * @throws IllegalStateException if this engine is closed
+     */
+    InspectJarEntryRequest outputJarEntry(String entryName) throws IllegalStateException;
+
+    /**
+     * Indicates to this engine that the specified JAR entry was removed from the input. It's safe
+     * to invoke this for entries for which {@link #inputJarEntry(String)} hasn't been invoked.
+     *
+     * @return output policy of this JAR entry. The policy indicates how this input entry affects
+     *         the output APK. The client of this engine should use this information to determine
+     *         how the removal of this input APK's JAR entry affects the output APK.
+     *
+     * @throws IllegalStateException if this engine is closed
+     */
+    InputJarEntryInstructions.OutputPolicy inputJarEntryRemoved(String entryName)
+            throws IllegalStateException;
+
+    /**
+     * Indicates to this engine that the specified JAR entry was removed from the output. It's safe
+     * to invoke this for entries for which {@link #outputJarEntry(String)} hasn't been invoked.
+     *
+     * @throws IllegalStateException if this engine is closed
+     */
+    void outputJarEntryRemoved(String entryName) throws IllegalStateException;
+
+    /**
+     * Indicates to this engine that all JAR entries have been output.
+     *
+     *
+     * @return request to add JAR signature to the output or {@code null} if there is no need to add
+     *         a JAR signature. The request will contain additional JAR entries to be output. The
+     *         request must be fulfilled before
+     *         {@link #outputZipSections(DataSource, DataSource, DataSource)} is invoked.
+     *
+     * @throws InvalidKeyException if a signature could not be generated because a signing key is
+     *         not suitable for generating the signature
+     * @throws SignatureException if an error occurred while generating the JAR signature
+     * @throws IllegalStateException if there are unfulfilled requests, such as to inspect some JAR
+     *         entries, or if the engine is closed
+     */
+    OutputJarSignatureRequest outputJarEntries() throws InvalidKeyException, SignatureException;
+
+    /**
+     * Indicates to this engine that the ZIP sections comprising the output APK have been output.
+     *
+     * <p>The provided data sources are guaranteed to not be used by the engine after this method
+     * terminates.
+     *
+     * @param zipEntries the section of ZIP archive containing Local File Header records and data of
+     *        the ZIP entries. In a well-formed archive, this section starts at the start of the
+     *        archive and extends all the way to the ZIP Central Directory.
+     * @param zipCentralDirectory ZIP Central Directory section
+     * @param zipEocd ZIP End of Central Directory (EoCD) record
+     *
+     * @return request to add an APK Signing Block to the output or {@code null} if the output must
+     *         not contain an APK Signing Block. The request must be fulfilled before
+     *         {@link #outputDone()} is invoked.
+     *
+     * @throws IOException if an I/O error occurs while reading the provided ZIP sections
+     * @throws InvalidKeyException if a signature could not be generated because a signing key is
+     *         not suitable for generating the signature
+     * @throws SignatureException if an error occurred while generating the APK's signature
+     * @throws IllegalStateException if there are unfulfilled requests, such as to inspect some JAR
+     *         entries or to output JAR signature, or if the engine is closed
+     */
+    OutputApkSigningBlockRequest outputZipSections(
+            DataSource zipEntries,
+            DataSource zipCentralDirectory,
+            DataSource zipEocd) throws IOException, InvalidKeyException, SignatureException;
+
+    /**
+     * Indicates to this engine that the signed APK was output.
+     *
+     * <p>This does not change the output APK. The method helps the client confirm that the current
+     * output is signed.
+     *
+     * @throws IllegalStateException if there are unfulfilled requests, such as to inspect some JAR
+     *         entries or to output signatures, or if the engine is closed
+     */
+    void outputDone() throws IllegalStateException;
+
+    /**
+     * Indicates to this engine that it will no longer be used. Invoking this on an already closed
+     * engine is OK.
+     *
+     * <p>This does not change the output APK. For example, if the output APK is not yet fully
+     * signed, it will remain so after this method terminates.
+     */
+    @Override
+    void close();
+
+    /**
+     * Instructions about how to handle an input APK's JAR entry.
+     *
+     * <p>The instructions indicate whether to output the entry (see {@link #getOutputPolicy()}) and
+     * may contain a request to inspect the entry (see {@link #getInspectJarEntryRequest()}), in
+     * which case the request must be fulfilled before {@link ApkSignerEngine#outputJarEntries()} is
+     * invoked.
+     */
+    public static class InputJarEntryInstructions {
+        private final OutputPolicy mOutputPolicy;
+        private final InspectJarEntryRequest mInspectJarEntryRequest;
+
+        /**
+         * Constructs a new {@code InputJarEntryInstructions} instance with the provided entry
+         * output policy and without a request to inspect the entry.
+         */
+        public InputJarEntryInstructions(OutputPolicy outputPolicy) {
+            this(outputPolicy, null);
+        }
+
+        /**
+         * Constructs a new {@code InputJarEntryInstructions} instance with the provided entry
+         * output mode and with the provided request to inspect the entry.
+         *
+         * @param inspectJarEntryRequest request to inspect the entry or {@code null} if there's no
+         *        need to inspect the entry.
+         */
+        public InputJarEntryInstructions(
+                OutputPolicy outputPolicy,
+                InspectJarEntryRequest inspectJarEntryRequest) {
+            mOutputPolicy = outputPolicy;
+            mInspectJarEntryRequest = inspectJarEntryRequest;
+        }
+
+        /**
+         * Returns the output policy for this entry.
+         */
+        public OutputPolicy getOutputPolicy() {
+            return mOutputPolicy;
+        }
+
+        /**
+         * Returns the request to inspect the JAR entry or {@code null} if there is no need to
+         * inspect the entry.
+         */
+        public InspectJarEntryRequest getInspectJarEntryRequest() {
+            return mInspectJarEntryRequest;
+        }
+
+        /**
+         * Output policy for an input APK's JAR entry.
+         */
+        public static enum OutputPolicy {
+            /** Entry must not be output. */
+            SKIP,
+
+            /** Entry should be output. */
+            OUTPUT,
+
+            /** Entry will be output by the engine. The client can thus ignore this input entry. */
+            OUTPUT_BY_ENGINE,
+        }
+    }
+
+    /**
+     * Request to inspect the specified JAR entry.
+     *
+     * <p>The entry's uncompressed data must be provided to the data sink returned by
+     * {@link #getDataSink()}. Once the entry's data has been provided to the sink, {@link #done()}
+     * must be invoked.
+     */
+    interface InspectJarEntryRequest {
+
+        /**
+         * Returns the data sink into which the entry's uncompressed data should be sent.
+         */
+        DataSink getDataSink();
+
+        /**
+         * Indicates that entry's data has been provided in full.
+         */
+        void done();
+
+        /**
+         * Returns the name of the JAR entry.
+         */
+        String getEntryName();
+    }
+
+    /**
+     * Request to add JAR signature (aka v1 signature) to the output APK.
+     *
+     * <p>Entries listed in {@link #getAdditionalJarEntries()} must be added to the output APK after
+     * which {@link #done()} must be invoked.
+     */
+    interface OutputJarSignatureRequest {
+
+        /**
+         * Returns JAR entries that must be added to the output APK.
+         */
+        List<JarEntry> getAdditionalJarEntries();
+
+        /**
+         * Indicates that the JAR entries contained in this request were added to the output APK.
+         */
+        void done();
+
+        /**
+         * JAR entry.
+         */
+        public static class JarEntry {
+            private final String mName;
+            private final byte[] mData;
+
+            /**
+             * Constructs a new {@code JarEntry} with the provided name and data.
+             *
+             * @param data uncompressed data of the entry. Changes to this array will not be
+             *        reflected in {@link #getData()}.
+             */
+            public JarEntry(String name, byte[] data) {
+                mName = name;
+                mData = data.clone();
+            }
+
+            /**
+             * Returns the name of this ZIP entry.
+             */
+            public String getName() {
+                return mName;
+            }
+
+            /**
+             * Returns the uncompressed data of this JAR entry.
+             */
+            public byte[] getData() {
+                return mData.clone();
+            }
+        }
+    }
+
+    /**
+     * Request to add the specified APK Signing Block to the output APK. APK Signature Scheme v2
+     * signature(s) of the APK are contained in this block.
+     *
+     * <p>The APK Signing Block returned by {@link #getApkSigningBlock()} must be placed into the
+     * output APK such that the block is immediately before the ZIP Central Directory, the offset of
+     * ZIP Central Directory in the ZIP End of Central Directory record must be adjusted
+     * accordingly, and then {@link #done()} must be invoked.
+     *
+     * <p>If the output contains an APK Signing Block, that block must be replaced by the block
+     * contained in this request.
+     */
+    interface OutputApkSigningBlockRequest {
+
+        /**
+         * Returns the APK Signing Block.
+         */
+        byte[] getApkSigningBlock();
+
+        /**
+         * Indicates that the APK Signing Block was output as requested.
+         */
+        void done();
+    }
+}
diff --git a/tools/apksigner/core/src/com/android/apksigner/core/DefaultApkSignerEngine.java b/tools/apksigner/core/src/com/android/apksigner/core/DefaultApkSignerEngine.java
new file mode 100644
index 0000000..30d4011
--- /dev/null
+++ b/tools/apksigner/core/src/com/android/apksigner/core/DefaultApkSignerEngine.java
@@ -0,0 +1,870 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.apksigner.core;
+
+import com.android.apksigner.core.internal.apk.v1.DigestAlgorithm;
+import com.android.apksigner.core.internal.apk.v1.V1SchemeSigner;
+import com.android.apksigner.core.internal.apk.v2.MessageDigestSink;
+import com.android.apksigner.core.internal.apk.v2.V2SchemeSigner;
+import com.android.apksigner.core.internal.util.ByteArrayOutputStreamSink;
+import com.android.apksigner.core.internal.util.Pair;
+import com.android.apksigner.core.util.DataSink;
+import com.android.apksigner.core.util.DataSource;
+
+import java.io.IOException;
+import java.security.InvalidKeyException;
+import java.security.MessageDigest;
+import java.security.PrivateKey;
+import java.security.PublicKey;
+import java.security.SignatureException;
+import java.security.cert.CertificateEncodingException;
+import java.security.cert.X509Certificate;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * Default implementation of {@link ApkSignerEngine}.
+ *
+ * <p>Use {@link Builder} to obtain instances of this engine.
+ */
+public class DefaultApkSignerEngine implements ApkSignerEngine {
+
+    // IMPLEMENTATION NOTE: This engine generates a signed APK as follows:
+    // 1. The engine asks its client to output input JAR entries which are not part of JAR
+    //    signature.
+    // 2. If JAR signing (v1 signing) is enabled, the engine inspects the output JAR entries to
+    //    compute their digests, to be placed into output META-INF/MANIFEST.MF. It also inspects
+    //    the contents of input and output META-INF/MANIFEST.MF to borrow the main section of the
+    //    file. It does not care about individual (i.e., JAR entry-specific) sections. It then
+    //    emits the v1 signature (a set of JAR entries) and asks the client to output them.
+    // 3. If APK Signature Scheme v2 (v2 signing) is enabled, the engine emits an APK Signing Block
+    //    from outputZipSections() and asks its client to insert this block into the output.
+
+    private final boolean mV1SigningEnabled;
+    private final boolean mV2SigningEnabled;
+    private final boolean mOtherSignersSignaturesPreserved;
+    private final List<V1SchemeSigner.SignerConfig> mV1SignerConfigs;
+    private final DigestAlgorithm mV1ContentDigestAlgorithm;
+    private final List<V2SchemeSigner.SignerConfig> mV2SignerConfigs;
+
+    private boolean mClosed;
+
+    private boolean mV1SignaturePending;
+
+    /**
+     * Names of JAR entries which this engine is expected to output as part of v1 signing.
+     */
+    private final Set<String> mSignatureExpectedOutputJarEntryNames;
+
+    /** Requests for digests of output JAR entries. */
+    private final Map<String, GetJarEntryDataDigestRequest> mOutputJarEntryDigestRequests =
+            new HashMap<>();
+
+    /** Digests of output JAR entries. */
+    private final Map<String, byte[]> mOutputJarEntryDigests = new HashMap<>();
+
+    /** Data of JAR entries emitted by this engine as v1 signature. */
+    private final Map<String, byte[]> mEmittedSignatureJarEntryData = new HashMap<>();
+
+    /** Requests for data of output JAR entries which comprise the v1 signature. */
+    private final Map<String, GetJarEntryDataRequest> mOutputSignatureJarEntryDataRequests =
+            new HashMap<>();
+    /**
+     * Request to obtain the data of MANIFEST.MF or {@code null} if the request hasn't been issued.
+     */
+    private GetJarEntryDataRequest mInputJarManifestEntryDataRequest;
+
+    /**
+     * Request to output the emitted v1 signature or {@code null} if the request hasn't been issued.
+     */
+    private OutputJarSignatureRequestImpl mAddV1SignatureRequest;
+
+    private boolean mV2SignaturePending;
+
+    /**
+     * Request to output the emitted v2 signature or {@code null} if the request hasn't been issued.
+     */
+    private OutputApkSigningBlockRequestImpl mAddV2SignatureRequest;
+
+    private DefaultApkSignerEngine(
+            List<SignerConfig> signerConfigs,
+            int minSdkVersion,
+            boolean v1SigningEnabled,
+            boolean v2SigningEnabled,
+            boolean otherSignersSignaturesPreserved) throws InvalidKeyException {
+        if (signerConfigs.isEmpty()) {
+            throw new IllegalArgumentException("At least one signer config must be provided");
+        }
+        if (otherSignersSignaturesPreserved) {
+            throw new UnsupportedOperationException(
+                    "Preserving other signer's signatures is not yet implemented");
+        }
+
+        mV1SigningEnabled = v1SigningEnabled;
+        mV2SigningEnabled = v2SigningEnabled;
+        mOtherSignersSignaturesPreserved = otherSignersSignaturesPreserved;
+        mV1SignerConfigs =
+                (v1SigningEnabled)
+                        ? new ArrayList<>(signerConfigs.size()) : Collections.emptyList();
+        mV2SignerConfigs =
+                (v2SigningEnabled)
+                        ? new ArrayList<>(signerConfigs.size()) : Collections.emptyList();
+        mV1ContentDigestAlgorithm =
+                (v1SigningEnabled)
+                        ? V1SchemeSigner.getSuggestedContentDigestAlgorithm(minSdkVersion) : null;
+        for (SignerConfig signerConfig : signerConfigs) {
+            List<X509Certificate> certificates = signerConfig.getCertificates();
+            PublicKey publicKey = certificates.get(0).getPublicKey();
+
+            if (v1SigningEnabled) {
+                DigestAlgorithm v1SignatureDigestAlgorithm =
+                        V1SchemeSigner.getSuggestedSignatureDigestAlgorithm(
+                                publicKey, minSdkVersion);
+                V1SchemeSigner.SignerConfig v1SignerConfig = new V1SchemeSigner.SignerConfig();
+                v1SignerConfig.name = signerConfig.getName();
+                v1SignerConfig.privateKey = signerConfig.getPrivateKey();
+                v1SignerConfig.certificates = certificates;
+                v1SignerConfig.contentDigestAlgorithm = mV1ContentDigestAlgorithm;
+                v1SignerConfig.signatureDigestAlgorithm = v1SignatureDigestAlgorithm;
+                mV1SignerConfigs.add(v1SignerConfig);
+            }
+
+            if (v2SigningEnabled) {
+                V2SchemeSigner.SignerConfig v2SignerConfig = new V2SchemeSigner.SignerConfig();
+                v2SignerConfig.privateKey = signerConfig.getPrivateKey();
+                v2SignerConfig.certificates = certificates;
+                v2SignerConfig.signatureAlgorithms =
+                        V2SchemeSigner.getSuggestedSignatureAlgorithms(publicKey, minSdkVersion);
+                mV2SignerConfigs.add(v2SignerConfig);
+            }
+        }
+        mSignatureExpectedOutputJarEntryNames =
+                (v1SigningEnabled)
+                        ? V1SchemeSigner.getOutputEntryNames(mV1SignerConfigs)
+                        : Collections.emptySet();
+    }
+
+    @Override
+    public void inputApkSigningBlock(DataSource apkSigningBlock) {
+        checkNotClosed();
+
+        if ((apkSigningBlock == null) || (apkSigningBlock.size() == 0)) {
+            return;
+        }
+
+        if (mOtherSignersSignaturesPreserved) {
+            // TODO: Preserve blocks other than APK Signature Scheme v2 blocks of signers configured
+            // in this engine.
+            return;
+        }
+        // TODO: Preserve blocks other than APK Signature Scheme v2 blocks.
+    }
+
+    @Override
+    public InputJarEntryInstructions inputJarEntry(String entryName) {
+        checkNotClosed();
+
+        InputJarEntryInstructions.OutputPolicy outputPolicy =
+                getInputJarEntryOutputPolicy(entryName);
+        switch (outputPolicy) {
+            case SKIP:
+                return new InputJarEntryInstructions(InputJarEntryInstructions.OutputPolicy.SKIP);
+            case OUTPUT:
+                return new InputJarEntryInstructions(InputJarEntryInstructions.OutputPolicy.OUTPUT);
+            case OUTPUT_BY_ENGINE:
+                if (V1SchemeSigner.MANIFEST_ENTRY_NAME.equals(entryName)) {
+                    // We copy the main section of the JAR manifest from input to output. Thus, this
+                    // invalidates v1 signature and we need to see the entry's data.
+                    mInputJarManifestEntryDataRequest = new GetJarEntryDataRequest(entryName);
+                    return new InputJarEntryInstructions(
+                            InputJarEntryInstructions.OutputPolicy.OUTPUT_BY_ENGINE,
+                            mInputJarManifestEntryDataRequest);
+                }
+                return new InputJarEntryInstructions(
+                        InputJarEntryInstructions.OutputPolicy.OUTPUT_BY_ENGINE);
+            default:
+                throw new RuntimeException("Unsupported output policy: " + outputPolicy);
+        }
+    }
+
+    @Override
+    public InspectJarEntryRequest outputJarEntry(String entryName) {
+        checkNotClosed();
+        invalidateV2Signature();
+        if (!mV1SigningEnabled) {
+            // No need to inspect JAR entries when v1 signing is not enabled.
+            return null;
+        }
+        // v1 signing is enabled
+
+        if (V1SchemeSigner.isJarEntryDigestNeededInManifest(entryName)) {
+            // This entry is covered by v1 signature. We thus need to inspect the entry's data to
+            // compute its digest(s) for v1 signature.
+
+            // TODO: Handle the case where other signer's v1 signatures are present and need to be
+            // preserved. In that scenario we can't modify MANIFEST.MF and add/remove JAR entries
+            // covered by v1 signature.
+            invalidateV1Signature();
+            GetJarEntryDataDigestRequest dataDigestRequest =
+                    new GetJarEntryDataDigestRequest(
+                            entryName,
+                            V1SchemeSigner.getMessageDigestInstance(mV1ContentDigestAlgorithm));
+            mOutputJarEntryDigestRequests.put(entryName, dataDigestRequest);
+            mOutputJarEntryDigests.remove(entryName);
+            return dataDigestRequest;
+        }
+
+        if (mSignatureExpectedOutputJarEntryNames.contains(entryName)) {
+            // This entry is part of v1 signature generated by this engine. We need to check whether
+            // the entry's data is as output by the engine.
+            invalidateV1Signature();
+            GetJarEntryDataRequest dataRequest;
+            if (V1SchemeSigner.MANIFEST_ENTRY_NAME.equals(entryName)) {
+                dataRequest = new GetJarEntryDataRequest(entryName);
+                mInputJarManifestEntryDataRequest = dataRequest;
+            } else {
+                // If this entry is part of v1 signature which has been emitted by this engine,
+                // check whether the output entry's data matches what the engine emitted.
+                dataRequest =
+                        (mEmittedSignatureJarEntryData.containsKey(entryName))
+                                ? new GetJarEntryDataRequest(entryName) : null;
+            }
+
+            if (dataRequest != null) {
+                mOutputSignatureJarEntryDataRequests.put(entryName, dataRequest);
+            }
+            return dataRequest;
+        }
+
+        // This entry is not covered by v1 signature and isn't part of v1 signature.
+        return null;
+    }
+
+    @Override
+    public InputJarEntryInstructions.OutputPolicy inputJarEntryRemoved(String entryName) {
+        checkNotClosed();
+        return getInputJarEntryOutputPolicy(entryName);
+    }
+
+    @Override
+    public void outputJarEntryRemoved(String entryName) {
+        checkNotClosed();
+        invalidateV2Signature();
+        if (!mV1SigningEnabled) {
+            return;
+        }
+
+        if (V1SchemeSigner.isJarEntryDigestNeededInManifest(entryName)) {
+            // This entry is covered by v1 signature.
+            invalidateV1Signature();
+            mOutputJarEntryDigests.remove(entryName);
+            mOutputJarEntryDigestRequests.remove(entryName);
+            mOutputSignatureJarEntryDataRequests.remove(entryName);
+            return;
+        }
+
+        if (mSignatureExpectedOutputJarEntryNames.contains(entryName)) {
+            // This entry is part of the v1 signature generated by this engine.
+            invalidateV1Signature();
+            return;
+        }
+    }
+
+    @Override
+    public OutputJarSignatureRequest outputJarEntries()
+            throws InvalidKeyException, SignatureException {
+        checkNotClosed();
+
+        if (!mV1SignaturePending) {
+            return null;
+        }
+
+        if ((mInputJarManifestEntryDataRequest != null)
+                && (!mInputJarManifestEntryDataRequest.isDone())) {
+            throw new IllegalStateException(
+                    "Still waiting to inspect input APK's "
+                            + mInputJarManifestEntryDataRequest.getEntryName());
+        }
+
+        for (GetJarEntryDataDigestRequest digestRequest
+                : mOutputJarEntryDigestRequests.values()) {
+            String entryName = digestRequest.getEntryName();
+            if (!digestRequest.isDone()) {
+                throw new IllegalStateException(
+                        "Still waiting to inspect output APK's " + entryName);
+            }
+            mOutputJarEntryDigests.put(entryName, digestRequest.getDigest());
+        }
+        mOutputJarEntryDigestRequests.clear();
+
+        for (GetJarEntryDataRequest dataRequest : mOutputSignatureJarEntryDataRequests.values()) {
+            if (!dataRequest.isDone()) {
+                throw new IllegalStateException(
+                        "Still waiting to inspect output APK's " + dataRequest.getEntryName());
+            }
+        }
+
+        List<Integer> apkSigningSchemeIds =
+                (mV2SigningEnabled) ? Collections.singletonList(2) : Collections.emptyList();
+        byte[] inputJarManifest =
+                (mInputJarManifestEntryDataRequest != null)
+                    ? mInputJarManifestEntryDataRequest.getData() : null;
+
+        // Check whether the most recently used signature (if present) is still fine.
+        List<Pair<String, byte[]>> signatureZipEntries;
+        if ((mAddV1SignatureRequest == null) || (!mAddV1SignatureRequest.isDone())) {
+            try {
+                signatureZipEntries =
+                        V1SchemeSigner.sign(
+                                mV1SignerConfigs,
+                                mV1ContentDigestAlgorithm,
+                                mOutputJarEntryDigests,
+                                apkSigningSchemeIds,
+                                inputJarManifest);
+            } catch (CertificateEncodingException e) {
+                throw new SignatureException("Failed to generate v1 signature", e);
+            }
+        } else {
+            V1SchemeSigner.OutputManifestFile newManifest =
+                    V1SchemeSigner.generateManifestFile(
+                            mV1ContentDigestAlgorithm, mOutputJarEntryDigests, inputJarManifest);
+            byte[] emittedSignatureManifest =
+                    mEmittedSignatureJarEntryData.get(V1SchemeSigner.MANIFEST_ENTRY_NAME);
+            if (!Arrays.equals(newManifest.contents, emittedSignatureManifest)) {
+                // Emitted v1 signature is no longer valid.
+                try {
+                    signatureZipEntries =
+                            V1SchemeSigner.signManifest(
+                                    mV1SignerConfigs,
+                                    mV1ContentDigestAlgorithm,
+                                    apkSigningSchemeIds,
+                                    newManifest);
+                } catch (CertificateEncodingException e) {
+                    throw new SignatureException("Failed to generate v1 signature", e);
+                }
+            } else {
+                // Emitted v1 signature is still valid. Check whether the signature is there in the
+                // output.
+                signatureZipEntries = new ArrayList<>();
+                for (Map.Entry<String, byte[]> expectedOutputEntry
+                        : mEmittedSignatureJarEntryData.entrySet()) {
+                    String entryName = expectedOutputEntry.getKey();
+                    byte[] expectedData = expectedOutputEntry.getValue();
+                    GetJarEntryDataRequest actualDataRequest =
+                            mOutputSignatureJarEntryDataRequests.get(entryName);
+                    if (actualDataRequest == null) {
+                        // This signature entry hasn't been output.
+                        signatureZipEntries.add(Pair.of(entryName, expectedData));
+                        continue;
+                    }
+                    byte[] actualData = actualDataRequest.getData();
+                    if (!Arrays.equals(expectedData, actualData)) {
+                        signatureZipEntries.add(Pair.of(entryName, expectedData));
+                    }
+                }
+                if (signatureZipEntries.isEmpty()) {
+                    // v1 signature in the output is valid
+                    return null;
+                }
+                // v1 signature in the output is not valid.
+            }
+        }
+
+        if (signatureZipEntries.isEmpty()) {
+            // v1 signature in the output is valid
+            mV1SignaturePending = false;
+            return null;
+        }
+
+        List<OutputJarSignatureRequest.JarEntry> sigEntries =
+                new ArrayList<>(signatureZipEntries.size());
+        for (Pair<String, byte[]> entry : signatureZipEntries) {
+            String entryName = entry.getFirst();
+            byte[] entryData = entry.getSecond();
+            sigEntries.add(new OutputJarSignatureRequest.JarEntry(entryName, entryData));
+            mEmittedSignatureJarEntryData.put(entryName, entryData);
+        }
+        mAddV1SignatureRequest = new OutputJarSignatureRequestImpl(sigEntries);
+        return mAddV1SignatureRequest;
+    }
+
+    @Override
+    public OutputApkSigningBlockRequest outputZipSections(
+            DataSource zipEntries,
+            DataSource zipCentralDirectory,
+            DataSource zipEocd) throws IOException, InvalidKeyException, SignatureException {
+        checkNotClosed();
+        checkV1SigningDoneIfEnabled();
+        if (!mV2SigningEnabled) {
+            return null;
+        }
+        invalidateV2Signature();
+
+        byte[] apkSigningBlock =
+                V2SchemeSigner.generateApkSigningBlock(
+                        zipEntries, zipCentralDirectory, zipEocd, mV2SignerConfigs);
+
+        mAddV2SignatureRequest = new OutputApkSigningBlockRequestImpl(apkSigningBlock);
+        return mAddV2SignatureRequest;
+    }
+
+    @Override
+    public void outputDone() {
+        checkNotClosed();
+        checkV1SigningDoneIfEnabled();
+        checkV2SigningDoneIfEnabled();
+    }
+
+    @Override
+    public void close() {
+        mClosed = true;
+
+        mAddV1SignatureRequest = null;
+        mInputJarManifestEntryDataRequest = null;
+        mOutputJarEntryDigestRequests.clear();
+        mOutputJarEntryDigests.clear();
+        mEmittedSignatureJarEntryData.clear();
+        mOutputSignatureJarEntryDataRequests.clear();
+
+        mAddV2SignatureRequest = null;
+    }
+
+    private void invalidateV1Signature() {
+        if (mV1SigningEnabled) {
+            mV1SignaturePending = true;
+        }
+        invalidateV2Signature();
+    }
+
+    private void invalidateV2Signature() {
+        if (mV2SigningEnabled) {
+            mV2SignaturePending = true;
+            mAddV2SignatureRequest = null;
+        }
+    }
+
+    private void checkNotClosed() {
+        if (mClosed) {
+            throw new IllegalStateException("Engine closed");
+        }
+    }
+
+    private void checkV1SigningDoneIfEnabled() {
+        if (!mV1SignaturePending) {
+            return;
+        }
+
+        if (mAddV1SignatureRequest == null) {
+            throw new IllegalStateException(
+                    "v1 signature (JAR signature) not yet generated. Skipped outputJarEntries()?");
+        }
+        if (!mAddV1SignatureRequest.isDone()) {
+            throw new IllegalStateException(
+                    "v1 signature (JAR signature) addition requested by outputJarEntries() hasn't"
+                            + " been fulfilled");
+        }
+        for (Map.Entry<String, byte[]> expectedOutputEntry
+                : mEmittedSignatureJarEntryData.entrySet()) {
+            String entryName = expectedOutputEntry.getKey();
+            byte[] expectedData = expectedOutputEntry.getValue();
+            GetJarEntryDataRequest actualDataRequest =
+                    mOutputSignatureJarEntryDataRequests.get(entryName);
+            if (actualDataRequest == null) {
+                throw new IllegalStateException(
+                        "APK entry " + entryName + " not yet output despite this having been"
+                                + " requested");
+            } else if (!actualDataRequest.isDone()) {
+                throw new IllegalStateException(
+                        "Still waiting to inspect output APK's " + entryName);
+            }
+            byte[] actualData = actualDataRequest.getData();
+            if (!Arrays.equals(expectedData, actualData)) {
+                throw new IllegalStateException(
+                        "Output APK entry " + entryName + " data differs from what was requested");
+            }
+        }
+        mV1SignaturePending = false;
+    }
+
+    private void checkV2SigningDoneIfEnabled() {
+        if (!mV2SignaturePending) {
+            return;
+        }
+        if (mAddV2SignatureRequest == null) {
+            throw new IllegalStateException(
+                    "v2 signature (APK Signature Scheme v2 signature) not yet generated."
+                            + " Skipped outputZipSections()?");
+        }
+        if (!mAddV2SignatureRequest.isDone()) {
+            throw new IllegalStateException(
+                    "v2 signature (APK Signature Scheme v2 signature) addition requested by"
+                            + " outputZipSections() hasn't been fulfilled yet");
+        }
+        mAddV2SignatureRequest = null;
+        mV2SignaturePending = false;
+    }
+
+    /**
+     * Returns the output policy for the provided input JAR entry.
+     */
+    private InputJarEntryInstructions.OutputPolicy getInputJarEntryOutputPolicy(String entryName) {
+        if (mSignatureExpectedOutputJarEntryNames.contains(entryName)) {
+            return InputJarEntryInstructions.OutputPolicy.OUTPUT_BY_ENGINE;
+        }
+        if ((mOtherSignersSignaturesPreserved)
+                || (V1SchemeSigner.isJarEntryDigestNeededInManifest(entryName))) {
+            return InputJarEntryInstructions.OutputPolicy.OUTPUT;
+        }
+        return InputJarEntryInstructions.OutputPolicy.SKIP;
+    }
+
+    private static class OutputJarSignatureRequestImpl implements OutputJarSignatureRequest {
+        private final List<JarEntry> mAdditionalJarEntries;
+        private volatile boolean mDone;
+
+        private OutputJarSignatureRequestImpl(List<JarEntry> additionalZipEntries) {
+            mAdditionalJarEntries =
+                    Collections.unmodifiableList(new ArrayList<>(additionalZipEntries));
+        }
+
+        @Override
+        public List<JarEntry> getAdditionalJarEntries() {
+            return mAdditionalJarEntries;
+        }
+
+        @Override
+        public void done() {
+            mDone = true;
+        }
+
+        private boolean isDone() {
+            return mDone;
+        }
+    }
+
+    private static class OutputApkSigningBlockRequestImpl implements OutputApkSigningBlockRequest {
+        private final byte[] mApkSigningBlock;
+        private volatile boolean mDone;
+
+        private OutputApkSigningBlockRequestImpl(byte[] apkSigingBlock) {
+            mApkSigningBlock = apkSigingBlock.clone();
+        }
+
+        @Override
+        public byte[] getApkSigningBlock() {
+            return mApkSigningBlock.clone();
+        }
+
+        @Override
+        public void done() {
+            mDone = true;
+        }
+
+        private boolean isDone() {
+            return mDone;
+        }
+    }
+
+    /**
+     * JAR entry inspection request which obtain the entry's uncompressed data.
+     */
+    private static class GetJarEntryDataRequest implements InspectJarEntryRequest {
+        private final String mEntryName;
+        private final Object mLock = new Object();
+        private final ByteArrayOutputStreamSink mBuf = new ByteArrayOutputStreamSink();
+
+        private boolean mDone;
+
+        private GetJarEntryDataRequest(String entryName) {
+            mEntryName = entryName;
+        }
+
+        @Override
+        public String getEntryName() {
+            return mEntryName;
+        }
+
+        @Override
+        public DataSink getDataSink() {
+            synchronized (mLock) {
+                checkNotDone();
+                return mBuf;
+            }
+        }
+
+        @Override
+        public void done() {
+            synchronized (mLock) {
+                if (mDone) {
+                    return;
+                }
+                mDone = true;
+            }
+        }
+
+        private boolean isDone() {
+            synchronized (mLock) {
+                return mDone;
+            }
+        }
+
+        private void checkNotDone() throws IllegalStateException {
+            synchronized (mLock) {
+                if (mDone) {
+                    throw new IllegalStateException("Already done");
+                }
+            }
+        }
+
+        private byte[] getData() {
+            synchronized (mLock) {
+                if (!mDone) {
+                    throw new IllegalStateException("Not yet done");
+                }
+                return mBuf.getData();
+            }
+        }
+    }
+
+    /**
+     * JAR entry inspection request which obtains the digest of the entry's uncompressed data.
+     */
+    private static class GetJarEntryDataDigestRequest implements InspectJarEntryRequest {
+        private final String mEntryName;
+        private final MessageDigest mMessageDigest;
+        private final DataSink mDataSink;
+        private final Object mLock = new Object();
+
+        private boolean mDone;
+        private byte[] mDigest;
+
+        private GetJarEntryDataDigestRequest(String entryName, MessageDigest digest) {
+            mEntryName = entryName;
+            mMessageDigest = digest;
+            mDataSink = new MessageDigestSink(new MessageDigest[] {mMessageDigest});
+        }
+
+        @Override
+        public String getEntryName() {
+            return mEntryName;
+        }
+
+        @Override
+        public DataSink getDataSink() {
+            synchronized (mLock) {
+                checkNotDone();
+                return mDataSink;
+            }
+        }
+
+        @Override
+        public void done() {
+            synchronized (mLock) {
+                if (mDone) {
+                    return;
+                }
+                mDone = true;
+                mDigest = mMessageDigest.digest();
+            }
+        }
+
+        private boolean isDone() {
+            synchronized (mLock) {
+                return mDone;
+            }
+        }
+
+        private void checkNotDone() throws IllegalStateException {
+            synchronized (mLock) {
+                if (mDone) {
+                    throw new IllegalStateException("Already done");
+                }
+            }
+        }
+
+        private byte[] getDigest() {
+            synchronized (mLock) {
+                if (!mDone) {
+                    throw new IllegalStateException("Not yet done");
+                }
+                return mDigest.clone();
+            }
+        }
+    }
+
+    /**
+     * Configuration of a signer.
+     *
+     * <p>Use {@link Builder} to obtain configuration instances.
+     */
+    public static class SignerConfig {
+        private final String mName;
+        private final PrivateKey mPrivateKey;
+        private final List<X509Certificate> mCertificates;
+
+        private SignerConfig(
+                String name,
+                PrivateKey privateKey,
+                List<X509Certificate> certificates) {
+            mName = name;
+            mPrivateKey = privateKey;
+            mCertificates = Collections.unmodifiableList(new ArrayList<>(certificates));
+        }
+
+        /**
+         * Returns the name of this signer.
+         */
+        public String getName() {
+            return mName;
+        }
+
+        /**
+         * Returns the signing key of this signer.
+         */
+        public PrivateKey getPrivateKey() {
+            return mPrivateKey;
+        }
+
+        /**
+         * Returns the certificate(s) of this signer. The first certificate's public key corresponds
+         * to this signer's private key.
+         */
+        public List<X509Certificate> getCertificates() {
+            return mCertificates;
+        }
+
+        /**
+         * Builder of {@link SignerConfig} instances.
+         */
+        public static class Builder {
+            private final String mName;
+            private final PrivateKey mPrivateKey;
+            private final List<X509Certificate> mCertificates;
+
+            /**
+             * Constructs a new {@code Builder}.
+             *
+             * @param name signer's name. The name is reflected in the name of files comprising the
+             *        JAR signature of the APK.
+             * @param privateKey signing key
+             * @param certificates list of one or more X.509 certificates. The subject public key of
+             *        the first certificate must correspond to the {@code privateKey}.
+             */
+            public Builder(
+                    String name,
+                    PrivateKey privateKey,
+                    List<X509Certificate> certificates) {
+                mName = name;
+                mPrivateKey = privateKey;
+                mCertificates = new ArrayList<>(certificates);
+            }
+
+            /**
+             * Returns a new {@code SignerConfig} instance configured based on the configuration of
+             * this builder.
+             */
+            public SignerConfig build() {
+                return new SignerConfig(
+                        mName,
+                        mPrivateKey,
+                        mCertificates);
+            }
+        }
+    }
+
+    /**
+     * Builder of {@link DefaultApkSignerEngine} instances.
+     */
+    public static class Builder {
+        private final List<SignerConfig> mSignerConfigs;
+        private final int mMinSdkVersion;
+
+        private boolean mV1SigningEnabled = true;
+        private boolean mV2SigningEnabled = true;
+        private boolean mOtherSignersSignaturesPreserved;
+
+        /**
+         * Constructs a new {@code Builder}.
+         *
+         * @param signerConfigs information about signers with which the APK will be signed. At
+         *        least one signer configuration must be provided.
+         * @param minSdkVersion API Level of the oldest Android platform on which the APK is
+         *        supposed to be installed. See {@code minSdkVersion} attribute in the APK's
+         *        {@code AndroidManifest.xml}. The higher the version, the stronger signing features
+         *        will be enabled.
+         */
+        public Builder(
+                List<SignerConfig> signerConfigs,
+                int minSdkVersion) {
+            if (signerConfigs.isEmpty()) {
+                throw new IllegalArgumentException("At least one signer config must be provided");
+            }
+            mSignerConfigs = new ArrayList<>(signerConfigs);
+            mMinSdkVersion = minSdkVersion;
+        }
+
+        /**
+         * Returns a new {@code DefaultApkSignerEngine} instance configured based on the
+         * configuration of this builder.
+         */
+        public DefaultApkSignerEngine build() throws InvalidKeyException {
+            return new DefaultApkSignerEngine(
+                    mSignerConfigs,
+                    mMinSdkVersion,
+                    mV1SigningEnabled,
+                    mV2SigningEnabled,
+                    mOtherSignersSignaturesPreserved);
+        }
+
+        /**
+         * Sets whether the APK should be signed using JAR signing (aka v1 signature scheme).
+         *
+         * <p>By default, the APK will be signed using this scheme.
+         */
+        public Builder setV1SigningEnabled(boolean enabled) {
+            mV1SigningEnabled = enabled;
+            return this;
+        }
+
+        /**
+         * Sets whether the APK should be signed using APK Signature Scheme v2 (aka v2 signature
+         * scheme).
+         *
+         * <p>By default, the APK will be signed using this scheme.
+         */
+        public Builder setV2SigningEnabled(boolean enabled) {
+            mV2SigningEnabled = enabled;
+            return this;
+        }
+
+        /**
+         * Sets whether signatures produced by signers other than the ones configured in this engine
+         * should be copied from the input APK to the output APK.
+         *
+         * <p>By default, signatures of other signers are omitted from the output APK.
+         */
+        public Builder setOtherSignersSignaturesPreserved(boolean preserved) {
+            mOtherSignersSignaturesPreserved = preserved;
+            return this;
+        }
+    }
+}
diff --git a/tools/apksigner/core/src/com/android/apksigner/core/internal/apk/v1/DigestAlgorithm.java b/tools/apksigner/core/src/com/android/apksigner/core/internal/apk/v1/DigestAlgorithm.java
new file mode 100644
index 0000000..71e698b
--- /dev/null
+++ b/tools/apksigner/core/src/com/android/apksigner/core/internal/apk/v1/DigestAlgorithm.java
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.apksigner.core.internal.apk.v1;
+
+/**
+ * Digest algorithm used with JAR signing (aka v1 signing scheme).
+ */
+public enum DigestAlgorithm {
+    /** SHA-1 */
+    SHA1("SHA-1"),
+
+    /** SHA2-256 */
+    SHA256("SHA-256");
+
+    private final String mJcaMessageDigestAlgorithm;
+
+    private DigestAlgorithm(String jcaMessageDigestAlgoritm) {
+        mJcaMessageDigestAlgorithm = jcaMessageDigestAlgoritm;
+    }
+
+    /**
+     * Returns the {@link java.security.MessageDigest} algorithm represented by this digest
+     * algorithm.
+     */
+    String getJcaMessageDigestAlgorithm() {
+        return mJcaMessageDigestAlgorithm;
+    }
+}
diff --git a/tools/apksigner/core/src/com/android/apksigner/core/internal/apk/v1/V1SchemeSigner.java b/tools/apksigner/core/src/com/android/apksigner/core/internal/apk/v1/V1SchemeSigner.java
new file mode 100644
index 0000000..b99cdec
--- /dev/null
+++ b/tools/apksigner/core/src/com/android/apksigner/core/internal/apk/v1/V1SchemeSigner.java
@@ -0,0 +1,526 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.apksigner.core.internal.apk.v1;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.security.InvalidKeyException;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.security.PrivateKey;
+import java.security.PublicKey;
+import java.security.SignatureException;
+import java.security.cert.CertificateEncodingException;
+import java.security.cert.X509Certificate;
+import java.util.ArrayList;
+import java.util.Base64;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Set;
+import java.util.SortedMap;
+import java.util.TreeMap;
+import java.util.jar.Attributes;
+import java.util.jar.Manifest;
+
+import org.bouncycastle.asn1.ASN1InputStream;
+import org.bouncycastle.asn1.DEROutputStream;
+import org.bouncycastle.cert.jcajce.JcaCertStore;
+import org.bouncycastle.cms.CMSException;
+import org.bouncycastle.cms.CMSProcessableByteArray;
+import org.bouncycastle.cms.CMSSignedData;
+import org.bouncycastle.cms.CMSSignedDataGenerator;
+import org.bouncycastle.cms.jcajce.JcaSignerInfoGeneratorBuilder;
+import org.bouncycastle.operator.ContentSigner;
+import org.bouncycastle.operator.OperatorCreationException;
+import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;
+import org.bouncycastle.operator.jcajce.JcaDigestCalculatorProviderBuilder;
+
+import com.android.apksigner.core.internal.jar.ManifestWriter;
+import com.android.apksigner.core.internal.jar.SignatureFileWriter;
+import com.android.apksigner.core.internal.util.Pair;
+
+/**
+ * APK signer which uses JAR signing (aka v1 signing scheme).
+ *
+ * @see <a href="https://docs.oracle.com/javase/8/docs/technotes/guides/jar/jar.html#Signed_JAR_File">Signed JAR File</a>
+ */
+public abstract class V1SchemeSigner {
+
+    public static final String MANIFEST_ENTRY_NAME = "META-INF/MANIFEST.MF";
+
+    private static final Attributes.Name ATTRIBUTE_NAME_CREATED_BY =
+            new Attributes.Name("Created-By");
+    private static final String ATTRIBUTE_DEFALT_VALUE_CREATED_BY = "1.0 (Android apksigner)";
+    private static final String ATTRIBUTE_VALUE_MANIFEST_VERSION = "1.0";
+    private static final String ATTRIBUTE_VALUE_SIGNATURE_VERSION = "1.0";
+
+    private static final Attributes.Name SF_ATTRIBUTE_NAME_ANDROID_APK_SIGNED_NAME =
+            new Attributes.Name("X-Android-APK-Signed");
+
+    /**
+     * Signer configuration.
+     */
+    public static class SignerConfig {
+        /** Name. */
+        public String name;
+
+        /** Private key. */
+        public PrivateKey privateKey;
+
+        /**
+         * Certificates, with the first certificate containing the public key corresponding to
+         * {@link #privateKey}.
+         */
+        public List<X509Certificate> certificates;
+
+        /**
+         * Digest algorithm used for the signature.
+         */
+        public DigestAlgorithm signatureDigestAlgorithm;
+
+        /**
+         * Digest algorithm used for digests of JAR entries and MANIFEST.MF.
+         */
+        public DigestAlgorithm contentDigestAlgorithm;
+    }
+
+    /** Hidden constructor to prevent instantiation. */
+    private V1SchemeSigner() {}
+
+    /**
+     * Gets the JAR signing digest algorithm to be used for signing an APK using the provided key.
+     *
+     * @param minSdkVersion minimum API Level of the platform on which the APK may be installed (see
+     *        AndroidManifest.xml minSdkVersion attribute)
+     *
+     * @throws InvalidKeyException if the provided key is not suitable for signing APKs using
+     *         JAR signing (aka v1 signature scheme)
+     */
+    public static DigestAlgorithm getSuggestedSignatureDigestAlgorithm(
+            PublicKey signingKey, int minSdkVersion) throws InvalidKeyException {
+        String keyAlgorithm = signingKey.getAlgorithm();
+        if ("RSA".equalsIgnoreCase(keyAlgorithm)) {
+            // Prior to API Level 18, only SHA-1 can be used with RSA.
+            if (minSdkVersion < 18) {
+                return DigestAlgorithm.SHA1;
+            }
+            return DigestAlgorithm.SHA256;
+        } else if ("DSA".equalsIgnoreCase(keyAlgorithm)) {
+            // Prior to API Level 21, only SHA-1 can be used with DSA
+            if (minSdkVersion < 21) {
+                return DigestAlgorithm.SHA1;
+            } else {
+                return DigestAlgorithm.SHA256;
+            }
+        } else if ("EC".equalsIgnoreCase(keyAlgorithm)) {
+            if (minSdkVersion < 18) {
+                throw new InvalidKeyException(
+                        "ECDSA signatures only supported for minSdkVersion 18 and higher");
+            }
+            // Prior to API Level 21, only SHA-1 can be used with ECDSA
+            if (minSdkVersion < 21) {
+                return DigestAlgorithm.SHA1;
+            } else {
+                return DigestAlgorithm.SHA256;
+            }
+        } else {
+            throw new InvalidKeyException("Unsupported key algorithm: " + keyAlgorithm);
+        }
+    }
+
+    /**
+     * Returns the JAR signing digest algorithm to be used for JAR entry digests.
+     *
+     * @param minSdkVersion minimum API Level of the platform on which the APK may be installed (see
+     *        AndroidManifest.xml minSdkVersion attribute)
+     */
+    public static DigestAlgorithm getSuggestedContentDigestAlgorithm(int minSdkVersion) {
+        return (minSdkVersion >= 18) ? DigestAlgorithm.SHA256 : DigestAlgorithm.SHA1;
+    }
+
+    /**
+     * Returns a new {@link MessageDigest} instance corresponding to the provided digest algorithm.
+     */
+    public static MessageDigest getMessageDigestInstance(DigestAlgorithm digestAlgorithm) {
+        String jcaAlgorithm = digestAlgorithm.getJcaMessageDigestAlgorithm();
+        try {
+            return MessageDigest.getInstance(jcaAlgorithm);
+        } catch (NoSuchAlgorithmException e) {
+            throw new RuntimeException("Failed to obtain " + jcaAlgorithm + " MessageDigest", e);
+        }
+    }
+
+    /**
+     * Returns {@code true} if the provided JAR entry must be mentioned in signed JAR archive's
+     * manifest.
+     */
+    public static boolean isJarEntryDigestNeededInManifest(String entryName) {
+        // See https://docs.oracle.com/javase/8/docs/technotes/guides/jar/jar.html#Signed_JAR_File
+
+        // Entries outside of META-INF must be listed in the manifest.
+        if (!entryName.startsWith("META-INF/")) {
+            return true;
+        }
+        // Entries in subdirectories of META-INF must be listed in the manifest.
+        if (entryName.indexOf('/', "META-INF/".length()) != -1) {
+            return true;
+        }
+
+        // Ignored file names (case-insensitive) in META-INF directory:
+        //   MANIFEST.MF
+        //   *.SF
+        //   *.RSA
+        //   *.DSA
+        //   *.EC
+        //   SIG-*
+        String fileNameLowerCase =
+                entryName.substring("META-INF/".length()).toLowerCase(Locale.US);
+        if (("manifest.mf".equals(fileNameLowerCase))
+                || (fileNameLowerCase.endsWith(".sf"))
+                || (fileNameLowerCase.endsWith(".rsa"))
+                || (fileNameLowerCase.endsWith(".dsa"))
+                || (fileNameLowerCase.endsWith(".ec"))
+                || (fileNameLowerCase.startsWith("sig-"))) {
+            return false;
+        }
+        return true;
+    }
+
+    /**
+     * Signs the provided APK using JAR signing (aka v1 signature scheme) and returns the list of
+     * JAR entries which need to be added to the APK as part of the signature.
+     *
+     * @param signerConfigs signer configurations, one for each signer. At least one signer config
+     *        must be provided.
+     *
+     * @throws InvalidKeyException if a signing key is not suitable for this signature scheme or
+     *         cannot be used in general
+     * @throws SignatureException if an error occurs when computing digests of generating
+     *         signatures
+     */
+    public static List<Pair<String, byte[]>> sign(
+            List<SignerConfig> signerConfigs,
+            DigestAlgorithm jarEntryDigestAlgorithm,
+            Map<String, byte[]> jarEntryDigests,
+            List<Integer> apkSigningSchemeIds,
+            byte[] sourceManifestBytes)
+                    throws InvalidKeyException, CertificateEncodingException, SignatureException {
+        if (signerConfigs.isEmpty()) {
+            throw new IllegalArgumentException("At least one signer config must be provided");
+        }
+        OutputManifestFile manifest =
+                generateManifestFile(jarEntryDigestAlgorithm, jarEntryDigests, sourceManifestBytes);
+
+        return signManifest(signerConfigs, jarEntryDigestAlgorithm, apkSigningSchemeIds, manifest);
+    }
+
+    /**
+     * Signs the provided APK using JAR signing (aka v1 signature scheme) and returns the list of
+     * JAR entries which need to be added to the APK as part of the signature.
+     *
+     * @param signerConfigs signer configurations, one for each signer. At least one signer config
+     *        must be provided.
+     *
+     * @throws InvalidKeyException if a signing key is not suitable for this signature scheme or
+     *         cannot be used in general
+     * @throws SignatureException if an error occurs when computing digests of generating
+     *         signatures
+     */
+    public static List<Pair<String, byte[]>> signManifest(
+            List<SignerConfig> signerConfigs,
+            DigestAlgorithm digestAlgorithm,
+            List<Integer> apkSigningSchemeIds,
+            OutputManifestFile manifest)
+                    throws InvalidKeyException, CertificateEncodingException, SignatureException {
+        if (signerConfigs.isEmpty()) {
+            throw new IllegalArgumentException("At least one signer config must be provided");
+        }
+
+        // For each signer output .SF and .(RSA|DSA|EC) file, then output MANIFEST.MF.
+        List<Pair<String, byte[]>> signatureJarEntries =
+                new ArrayList<>(2 * signerConfigs.size() + 1);
+        byte[] sfBytes =
+                generateSignatureFile(apkSigningSchemeIds, digestAlgorithm, manifest);
+        for (SignerConfig signerConfig : signerConfigs) {
+            String signerName = signerConfig.name;
+            byte[] signatureBlock;
+            try {
+                signatureBlock = generateSignatureBlock(signerConfig, sfBytes);
+            } catch (InvalidKeyException e) {
+                throw new InvalidKeyException(
+                        "Failed to sign using signer \"" + signerName + "\"", e);
+            } catch (CertificateEncodingException e) {
+                throw new CertificateEncodingException(
+                        "Failed to sign using signer \"" + signerName + "\"", e);
+            } catch (SignatureException e) {
+                throw new SignatureException(
+                        "Failed to sign using signer \"" + signerName + "\"", e);
+            }
+            signatureJarEntries.add(Pair.of("META-INF/" + signerName + ".SF", sfBytes));
+            PublicKey publicKey = signerConfig.certificates.get(0).getPublicKey();
+            String signatureBlockFileName =
+                    "META-INF/" + signerName + "."
+                            + publicKey.getAlgorithm().toUpperCase(Locale.US);
+            signatureJarEntries.add(
+                    Pair.of(signatureBlockFileName, signatureBlock));
+        }
+        signatureJarEntries.add(Pair.of(MANIFEST_ENTRY_NAME, manifest.contents));
+        return signatureJarEntries;
+    }
+
+    /**
+     * Returns the names of JAR entries which this signer will produce as part of v1 signature.
+     */
+    public static Set<String> getOutputEntryNames(List<SignerConfig> signerConfigs) {
+        Set<String> result = new HashSet<>(2 * signerConfigs.size() + 1);
+        for (SignerConfig signerConfig : signerConfigs) {
+            String signerName = signerConfig.name;
+            result.add("META-INF/" + signerName + ".SF");
+            PublicKey publicKey = signerConfig.certificates.get(0).getPublicKey();
+            String signatureBlockFileName =
+                    "META-INF/" + signerName + "."
+                            + publicKey.getAlgorithm().toUpperCase(Locale.US);
+            result.add(signatureBlockFileName);
+        }
+        result.add(MANIFEST_ENTRY_NAME);
+        return result;
+    }
+
+    /**
+     * Generated and returns the {@code META-INF/MANIFEST.MF} file based on the provided (optional)
+     * input {@code MANIFEST.MF} and digests of JAR entries covered by the manifest.
+     */
+    public static OutputManifestFile generateManifestFile(
+            DigestAlgorithm jarEntryDigestAlgorithm,
+            Map<String, byte[]> jarEntryDigests,
+            byte[] sourceManifestBytes) {
+        Manifest sourceManifest = null;
+        if (sourceManifestBytes != null) {
+            try {
+                sourceManifest = new Manifest(new ByteArrayInputStream(sourceManifestBytes));
+            } catch (IOException e) {
+                throw new IllegalArgumentException("Failed to parse source MANIFEST.MF", e);
+            }
+        }
+        ByteArrayOutputStream manifestOut = new ByteArrayOutputStream();
+        Attributes mainAttrs = new Attributes();
+        // Copy the main section from the source manifest (if provided). Otherwise use defaults.
+        if (sourceManifest != null) {
+            mainAttrs.putAll(sourceManifest.getMainAttributes());
+        } else {
+            mainAttrs.put(Attributes.Name.MANIFEST_VERSION, ATTRIBUTE_VALUE_MANIFEST_VERSION);
+            mainAttrs.put(ATTRIBUTE_NAME_CREATED_BY, ATTRIBUTE_DEFALT_VALUE_CREATED_BY);
+        }
+
+        try {
+            ManifestWriter.writeMainSection(manifestOut, mainAttrs);
+        } catch (IOException e) {
+            throw new RuntimeException("Failed to write in-memory MANIFEST.MF", e);
+        }
+
+        List<String> sortedEntryNames = new ArrayList<>(jarEntryDigests.keySet());
+        Collections.sort(sortedEntryNames);
+        SortedMap<String, byte[]> invidualSectionsContents = new TreeMap<>();
+        String entryDigestAttributeName = getEntryDigestAttributeName(jarEntryDigestAlgorithm);
+        for (String entryName : sortedEntryNames) {
+            byte[] entryDigest = jarEntryDigests.get(entryName);
+            Attributes entryAttrs = new Attributes();
+            entryAttrs.putValue(
+                    entryDigestAttributeName,
+                    Base64.getEncoder().encodeToString(entryDigest));
+            ByteArrayOutputStream sectionOut = new ByteArrayOutputStream();
+            byte[] sectionBytes;
+            try {
+                ManifestWriter.writeIndividualSection(sectionOut, entryName, entryAttrs);
+                sectionBytes = sectionOut.toByteArray();
+                manifestOut.write(sectionBytes);
+            } catch (IOException e) {
+                throw new RuntimeException("Failed to write in-memory MANIFEST.MF", e);
+            }
+            invidualSectionsContents.put(entryName, sectionBytes);
+        }
+
+        OutputManifestFile result = new OutputManifestFile();
+        result.contents = manifestOut.toByteArray();
+        result.mainSectionAttributes = mainAttrs;
+        result.individualSectionsContents = invidualSectionsContents;
+        return result;
+    }
+
+    public static class OutputManifestFile {
+        public byte[] contents;
+        public SortedMap<String, byte[]> individualSectionsContents;
+        public Attributes mainSectionAttributes;
+    }
+
+    private static byte[] generateSignatureFile(
+            List<Integer> apkSignatureSchemeIds,
+            DigestAlgorithm manifestDigestAlgorithm,
+            OutputManifestFile manifest) {
+        Manifest sf = new Manifest();
+        Attributes mainAttrs = sf.getMainAttributes();
+        mainAttrs.put(Attributes.Name.SIGNATURE_VERSION, ATTRIBUTE_VALUE_SIGNATURE_VERSION);
+        mainAttrs.put(ATTRIBUTE_NAME_CREATED_BY, ATTRIBUTE_DEFALT_VALUE_CREATED_BY);
+        if (!apkSignatureSchemeIds.isEmpty()) {
+            // Add APK Signature Scheme v2 (and newer) signature stripping protection.
+            // This attribute indicates that this APK is supposed to have been signed using one or
+            // more APK-specific signature schemes in addition to the standard JAR signature scheme
+            // used by this code. APK signature verifier should reject the APK if it does not
+            // contain a signature for the signature scheme the verifier prefers out of this set.
+            StringBuilder attrValue = new StringBuilder();
+            for (int id : apkSignatureSchemeIds) {
+                if (attrValue.length() > 0) {
+                    attrValue.append(", ");
+                }
+                attrValue.append(String.valueOf(id));
+            }
+            mainAttrs.put(
+                    SF_ATTRIBUTE_NAME_ANDROID_APK_SIGNED_NAME,
+                    attrValue.toString());
+        }
+
+        // Add main attribute containing the digest of MANIFEST.MF.
+        MessageDigest md = getMessageDigestInstance(manifestDigestAlgorithm);
+        mainAttrs.putValue(
+                getManifestDigestAttributeName(manifestDigestAlgorithm),
+                Base64.getEncoder().encodeToString(md.digest(manifest.contents)));
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        try {
+            SignatureFileWriter.writeMainSection(out, mainAttrs);
+        } catch (IOException e) {
+            throw new RuntimeException("Failed to write in-memory .SF file", e);
+        }
+        String entryDigestAttributeName = getEntryDigestAttributeName(manifestDigestAlgorithm);
+        for (Map.Entry<String, byte[]> manifestSection
+                : manifest.individualSectionsContents.entrySet()) {
+            String sectionName = manifestSection.getKey();
+            byte[] sectionContents = manifestSection.getValue();
+            byte[] sectionDigest = md.digest(sectionContents);
+            Attributes attrs = new Attributes();
+            attrs.putValue(
+                    entryDigestAttributeName,
+                    Base64.getEncoder().encodeToString(sectionDigest));
+
+            try {
+                SignatureFileWriter.writeIndividualSection(out, sectionName, attrs);
+            } catch (IOException e) {
+                throw new RuntimeException("Failed to write in-memory .SF file", e);
+            }
+        }
+
+        // A bug in the java.util.jar implementation of Android platforms up to version 1.6 will
+        // cause a spurious IOException to be thrown if the length of the signature file is a
+        // multiple of 1024 bytes. As a workaround, add an extra CRLF in this case.
+        if ((out.size() > 0) && ((out.size() % 1024) == 0)) {
+            try {
+                SignatureFileWriter.writeSectionDelimiter(out);
+            } catch (IOException e) {
+                throw new RuntimeException("Failed to write to ByteArrayOutputStream", e);
+            }
+        }
+
+        return out.toByteArray();
+    }
+
+    private static byte[] generateSignatureBlock(
+            SignerConfig signerConfig, byte[] signatureFileBytes)
+                    throws InvalidKeyException, CertificateEncodingException, SignatureException {
+        JcaCertStore certs = new JcaCertStore(signerConfig.certificates);
+        X509Certificate signerCert = signerConfig.certificates.get(0);
+        String jcaSignatureAlgorithm =
+                getJcaSignatureAlgorithm(
+                        signerCert.getPublicKey(), signerConfig.signatureDigestAlgorithm);
+        try {
+            ContentSigner signer =
+                    new JcaContentSignerBuilder(jcaSignatureAlgorithm)
+                    .build(signerConfig.privateKey);
+            CMSSignedDataGenerator gen = new CMSSignedDataGenerator();
+            gen.addSignerInfoGenerator(
+                    new JcaSignerInfoGeneratorBuilder(
+                            new JcaDigestCalculatorProviderBuilder().build())
+                    .setDirectSignature(true)
+                    .build(signer, signerCert));
+            gen.addCertificates(certs);
+
+            CMSSignedData sigData =
+                    gen.generate(new CMSProcessableByteArray(signatureFileBytes), false);
+
+            ByteArrayOutputStream out = new ByteArrayOutputStream();
+            try (ASN1InputStream asn1 = new ASN1InputStream(sigData.getEncoded())) {
+                DEROutputStream dos = new DEROutputStream(out);
+                dos.writeObject(asn1.readObject());
+            }
+            return out.toByteArray();
+        } catch (OperatorCreationException | CMSException | IOException e) {
+            throw new SignatureException("Failed to generate signature", e);
+        }
+    }
+
+    private static String getEntryDigestAttributeName(DigestAlgorithm digestAlgorithm) {
+        switch (digestAlgorithm) {
+            case SHA1:
+                return "SHA1-Digest";
+            case SHA256:
+                return "SHA-256-Digest";
+            default:
+                throw new IllegalArgumentException(
+                        "Unexpected content digest algorithm: " + digestAlgorithm);
+        }
+    }
+
+    private static String getManifestDigestAttributeName(DigestAlgorithm digestAlgorithm) {
+        switch (digestAlgorithm) {
+            case SHA1:
+                return "SHA1-Digest-Manifest";
+            case SHA256:
+                return "SHA-256-Digest-Manifest";
+            default:
+                throw new IllegalArgumentException(
+                        "Unexpected content digest algorithm: " + digestAlgorithm);
+        }
+    }
+
+    private static String getJcaSignatureAlgorithm(
+            PublicKey publicKey, DigestAlgorithm digestAlgorithm) throws InvalidKeyException {
+        String keyAlgorithm = publicKey.getAlgorithm();
+        String digestPrefixForSigAlg;
+        switch (digestAlgorithm) {
+            case SHA1:
+                digestPrefixForSigAlg = "SHA1";
+                break;
+            case SHA256:
+                digestPrefixForSigAlg = "SHA256";
+                break;
+            default:
+                throw new IllegalArgumentException(
+                        "Unexpected digest algorithm: " + digestAlgorithm);
+        }
+        if ("RSA".equalsIgnoreCase(keyAlgorithm)) {
+            return digestPrefixForSigAlg + "withRSA";
+        } else if ("DSA".equalsIgnoreCase(keyAlgorithm)) {
+            return digestPrefixForSigAlg + "withDSA";
+        } else if ("EC".equalsIgnoreCase(keyAlgorithm)) {
+            return digestPrefixForSigAlg + "withECDSA";
+        } else {
+            throw new InvalidKeyException("Unsupported key algorithm: " + keyAlgorithm);
+        }
+    }
+}
diff --git a/tools/apksigner/core/src/com/android/apksigner/core/internal/apk/v2/ContentDigestAlgorithm.java b/tools/apksigner/core/src/com/android/apksigner/core/internal/apk/v2/ContentDigestAlgorithm.java
new file mode 100644
index 0000000..cb0f84a
--- /dev/null
+++ b/tools/apksigner/core/src/com/android/apksigner/core/internal/apk/v2/ContentDigestAlgorithm.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.apksigner.core.internal.apk.v2;
+
+/**
+ * APK Signature Scheme v2 content digest algorithm.
+ */
+enum ContentDigestAlgorithm {
+    /** SHA2-256 over 1 MB chunks. */
+    CHUNKED_SHA256("SHA-256", 256 / 8),
+
+    /** SHA2-512 over 1 MB chunks. */
+    CHUNKED_SHA512("SHA-512", 512 / 8);
+
+    private final String mJcaMessageDigestAlgorithm;
+    private final int mChunkDigestOutputSizeBytes;
+
+    private ContentDigestAlgorithm(
+            String jcaMessageDigestAlgorithm, int chunkDigestOutputSizeBytes) {
+        mJcaMessageDigestAlgorithm = jcaMessageDigestAlgorithm;
+        mChunkDigestOutputSizeBytes = chunkDigestOutputSizeBytes;
+    }
+
+    /**
+     * Returns the {@link java.security.MessageDigest} algorithm used for computing digests of
+     * chunks by this content digest algorithm.
+     */
+    String getJcaMessageDigestAlgorithm() {
+        return mJcaMessageDigestAlgorithm;
+    }
+
+    /**
+     * Returns the size (in bytes) of the digest of a chunk of content.
+     */
+    int getChunkDigestOutputSizeBytes() {
+        return mChunkDigestOutputSizeBytes;
+    }
+}
\ No newline at end of file
diff --git a/tools/apksigner/core/src/com/android/apksigner/core/internal/apk/v2/MessageDigestSink.java b/tools/apksigner/core/src/com/android/apksigner/core/internal/apk/v2/MessageDigestSink.java
new file mode 100644
index 0000000..9ef04bf
--- /dev/null
+++ b/tools/apksigner/core/src/com/android/apksigner/core/internal/apk/v2/MessageDigestSink.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.apksigner.core.internal.apk.v2;
+
+import com.android.apksigner.core.util.DataSink;
+
+import java.nio.ByteBuffer;
+import java.security.MessageDigest;
+
+/**
+ * Data sink which feeds all received data into the associated {@link MessageDigest} instances. Each
+ * {@code MessageDigest} instance receives the same data.
+ */
+public class MessageDigestSink implements DataSink {
+
+    private final MessageDigest[] mMessageDigests;
+
+    public MessageDigestSink(MessageDigest[] digests) {
+        mMessageDigests = digests;
+    }
+
+    @Override
+    public void consume(byte[] buf, int offset, int length) {
+        for (MessageDigest md : mMessageDigests) {
+            md.update(buf, offset, length);
+        }
+    }
+
+    @Override
+    public void consume(ByteBuffer buf) {
+        int originalPosition = buf.position();
+        for (MessageDigest md : mMessageDigests) {
+            // Reset the position back to the original because the previous iteration's
+            // MessageDigest.update set the buffer's position to the buffer's limit.
+            buf.position(originalPosition);
+            md.update(buf);
+        }
+    }
+}
diff --git a/tools/apksigner/core/src/com/android/apksigner/core/internal/apk/v2/SignatureAlgorithm.java b/tools/apksigner/core/src/com/android/apksigner/core/internal/apk/v2/SignatureAlgorithm.java
new file mode 100644
index 0000000..3c7b5f0
--- /dev/null
+++ b/tools/apksigner/core/src/com/android/apksigner/core/internal/apk/v2/SignatureAlgorithm.java
@@ -0,0 +1,142 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.apksigner.core.internal.apk.v2;
+
+import com.android.apksigner.core.internal.util.Pair;
+
+import java.security.spec.AlgorithmParameterSpec;
+import java.security.spec.MGF1ParameterSpec;
+import java.security.spec.PSSParameterSpec;
+
+/**
+ * APK Signature Scheme v2 content digest algorithm.
+ */
+public enum SignatureAlgorithm {
+    /**
+     * RSASSA-PSS with SHA2-256 digest, SHA2-256 MGF1, 32 bytes of salt, trailer: 0xbc, content
+     * digested using SHA2-256 in 1 MB chunks.
+     */
+    RSA_PSS_WITH_SHA256(
+            0x0101,
+            ContentDigestAlgorithm.CHUNKED_SHA256,
+            "RSA",
+            Pair.of("SHA256withRSA/PSS",
+                    new PSSParameterSpec(
+                            "SHA-256", "MGF1", MGF1ParameterSpec.SHA256, 256 / 8, 1))),
+
+    /**
+     * RSASSA-PSS with SHA2-512 digest, SHA2-512 MGF1, 64 bytes of salt, trailer: 0xbc, content
+     * digested using SHA2-512 in 1 MB chunks.
+     */
+    RSA_PSS_WITH_SHA512(
+            0x0102,
+            ContentDigestAlgorithm.CHUNKED_SHA512,
+            "RSA",
+            Pair.of(
+                    "SHA512withRSA/PSS",
+                    new PSSParameterSpec(
+                            "SHA-512", "MGF1", MGF1ParameterSpec.SHA512, 512 / 8, 1))),
+
+    /** RSASSA-PKCS1-v1_5 with SHA2-256 digest, content digested using SHA2-256 in 1 MB chunks. */
+    RSA_PKCS1_V1_5_WITH_SHA256(
+            0x0103,
+            ContentDigestAlgorithm.CHUNKED_SHA256,
+            "RSA",
+            Pair.of("SHA256withRSA", null)),
+
+    /** RSASSA-PKCS1-v1_5 with SHA2-512 digest, content digested using SHA2-512 in 1 MB chunks. */
+    RSA_PKCS1_V1_5_WITH_SHA512(
+            0x0104,
+            ContentDigestAlgorithm.CHUNKED_SHA512,
+            "RSA",
+            Pair.of("SHA512withRSA", null)),
+
+    /** ECDSA with SHA2-256 digest, content digested using SHA2-256 in 1 MB chunks. */
+    ECDSA_WITH_SHA256(
+            0x0201,
+            ContentDigestAlgorithm.CHUNKED_SHA256,
+            "EC",
+            Pair.of("SHA256withECDSA", null)),
+
+    /** ECDSA with SHA2-512 digest, content digested using SHA2-512 in 1 MB chunks. */
+    ECDSA_WITH_SHA512(
+            0x0202,
+            ContentDigestAlgorithm.CHUNKED_SHA512,
+            "EC",
+            Pair.of("SHA512withECDSA", null)),
+
+    /** DSA with SHA2-256 digest, content digested using SHA2-256 in 1 MB chunks. */
+    DSA_WITH_SHA256(
+            0x0301,
+            ContentDigestAlgorithm.CHUNKED_SHA256,
+            "DSA",
+            Pair.of("SHA256withDSA", null));
+
+    private final int mId;
+    private final String mJcaKeyAlgorithm;
+    private final ContentDigestAlgorithm mContentDigestAlgorithm;
+    private final Pair<String, ? extends AlgorithmParameterSpec> mJcaSignatureAlgAndParams;
+
+    private SignatureAlgorithm(int id,
+            ContentDigestAlgorithm contentDigestAlgorithm,
+            String jcaKeyAlgorithm,
+            Pair<String, ? extends AlgorithmParameterSpec> jcaSignatureAlgAndParams) {
+        mId = id;
+        mContentDigestAlgorithm = contentDigestAlgorithm;
+        mJcaKeyAlgorithm = jcaKeyAlgorithm;
+        mJcaSignatureAlgAndParams = jcaSignatureAlgAndParams;
+    }
+
+    /**
+     * Returns the ID of this signature algorithm as used in APK Signature Scheme v2 wire format.
+     */
+    int getId() {
+        return mId;
+    }
+
+    /**
+     * Returns the content digest algorithm associated with this signature algorithm.
+     */
+    ContentDigestAlgorithm getContentDigestAlgorithm() {
+        return mContentDigestAlgorithm;
+    }
+
+    /**
+     * Returns the JCA {@link java.security.Key} algorithm used by this signature scheme.
+     */
+    String getJcaKeyAlgorithm() {
+        return mJcaKeyAlgorithm;
+    }
+
+    /**
+     * Returns the {@link java.security.Signature} algorithm and the {@link AlgorithmParameterSpec}
+     * (or null if not needed) to parameterize the {@code Signature}.
+     */
+    Pair<String, ? extends AlgorithmParameterSpec> getJcaSignatureAlgorithmAndParams() {
+        return mJcaSignatureAlgAndParams;
+    }
+
+    static SignatureAlgorithm findById(int id) {
+        for (SignatureAlgorithm alg : SignatureAlgorithm.values()) {
+            if (alg.getId() == id) {
+                return alg;
+            }
+        }
+
+        return null;
+    }
+}
diff --git a/tools/apksigner/core/src/com/android/apksigner/core/internal/apk/v2/V2SchemeSigner.java b/tools/apksigner/core/src/com/android/apksigner/core/internal/apk/v2/V2SchemeSigner.java
new file mode 100644
index 0000000..e185346
--- /dev/null
+++ b/tools/apksigner/core/src/com/android/apksigner/core/internal/apk/v2/V2SchemeSigner.java
@@ -0,0 +1,614 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.apksigner.core.internal.apk.v2;
+
+import com.android.apksigner.core.internal.util.ByteBufferSink;
+import com.android.apksigner.core.internal.util.Pair;
+import com.android.apksigner.core.internal.zip.ZipUtils;
+import com.android.apksigner.core.util.DataSource;
+import com.android.apksigner.core.util.DataSources;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.security.DigestException;
+import java.security.InvalidAlgorithmParameterException;
+import java.security.InvalidKeyException;
+import java.security.KeyFactory;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.security.PrivateKey;
+import java.security.PublicKey;
+import java.security.Signature;
+import java.security.SignatureException;
+import java.security.cert.CertificateEncodingException;
+import java.security.cert.X509Certificate;
+import java.security.interfaces.ECKey;
+import java.security.interfaces.RSAKey;
+import java.security.spec.AlgorithmParameterSpec;
+import java.security.spec.InvalidKeySpecException;
+import java.security.spec.X509EncodedKeySpec;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * APK Signature Scheme v2 signer.
+ *
+ * <p>APK Signature Scheme v2 is a whole-file signature scheme which aims to protect every single
+ * bit of the APK, as opposed to the JAR Signature Scheme which protects only the names and
+ * uncompressed contents of ZIP entries.
+ *
+ * <p>TODO: Link to APK Signature Scheme v2 documentation once it's available.
+ */
+public abstract class V2SchemeSigner {
+    /*
+     * The two main goals of APK Signature Scheme v2 are:
+     * 1. Detect any unauthorized modifications to the APK. This is achieved by making the signature
+     *    cover every byte of the APK being signed.
+     * 2. Enable much faster signature and integrity verification. This is achieved by requiring
+     *    only a minimal amount of APK parsing before the signature is verified, thus completely
+     *    bypassing ZIP entry decompression and by making integrity verification parallelizable by
+     *    employing a hash tree.
+     *
+     * The generated signature block is wrapped into an APK Signing Block and inserted into the
+     * original APK immediately before the start of ZIP Central Directory. This is to ensure that
+     * JAR and ZIP parsers continue to work on the signed APK. The APK Signing Block is designed for
+     * extensibility. For example, a future signature scheme could insert its signatures there as
+     * well. The contract of the APK Signing Block is that all contents outside of the block must be
+     * protected by signatures inside the block.
+     */
+
+    private static final int CONTENT_DIGESTED_CHUNK_MAX_SIZE_BYTES = 1024 * 1024;
+
+    private static final byte[] APK_SIGNING_BLOCK_MAGIC =
+          new byte[] {
+              0x41, 0x50, 0x4b, 0x20, 0x53, 0x69, 0x67, 0x20,
+              0x42, 0x6c, 0x6f, 0x63, 0x6b, 0x20, 0x34, 0x32,
+          };
+    private static final int APK_SIGNATURE_SCHEME_V2_BLOCK_ID = 0x7109871a;
+
+    /**
+     * Signer configuration.
+     */
+    public static class SignerConfig {
+        /** Private key. */
+        public PrivateKey privateKey;
+
+        /**
+         * Certificates, with the first certificate containing the public key corresponding to
+         * {@link #privateKey}.
+         */
+        public List<X509Certificate> certificates;
+
+        /**
+         * List of signature algorithms with which to sign.
+         */
+        public List<SignatureAlgorithm> signatureAlgorithms;
+    }
+
+    /** Hidden constructor to prevent instantiation. */
+    private V2SchemeSigner() {}
+
+    /**
+     * Gets the APK Signature Scheme v2 signature algorithms to be used for signing an APK using the
+     * provided key.
+     *
+     * @param minSdkVersion minimum API Level of the platform on which the APK may be installed (see
+     *        AndroidManifest.xml minSdkVersion attribute).
+     *
+     * @throws InvalidKeyException if the provided key is not suitable for signing APKs using
+     *         APK Signature Scheme v2
+     */
+    public static List<SignatureAlgorithm> getSuggestedSignatureAlgorithms(
+            PublicKey signingKey, int minSdkVersion) throws InvalidKeyException {
+        String keyAlgorithm = signingKey.getAlgorithm();
+        if ("RSA".equalsIgnoreCase(keyAlgorithm)) {
+            // Use RSASSA-PKCS1-v1_5 signature scheme instead of RSASSA-PSS to guarantee
+            // deterministic signatures which make life easier for OTA updates (fewer files
+            // changed when deterministic signature schemes are used).
+
+            // Pick a digest which is no weaker than the key.
+            int modulusLengthBits = ((RSAKey) signingKey).getModulus().bitLength();
+            if (modulusLengthBits <= 3072) {
+                // 3072-bit RSA is roughly 128-bit strong, meaning SHA-256 is a good fit.
+                return Collections.singletonList(SignatureAlgorithm.RSA_PKCS1_V1_5_WITH_SHA256);
+            } else {
+                // Keys longer than 3072 bit need to be paired with a stronger digest to avoid the
+                // digest being the weak link. SHA-512 is the next strongest supported digest.
+                return Collections.singletonList(SignatureAlgorithm.RSA_PKCS1_V1_5_WITH_SHA512);
+            }
+        } else if ("DSA".equalsIgnoreCase(keyAlgorithm)) {
+            // DSA is supported only with SHA-256.
+            return Collections.singletonList(SignatureAlgorithm.DSA_WITH_SHA256);
+        } else if ("EC".equalsIgnoreCase(keyAlgorithm)) {
+            // Pick a digest which is no weaker than the key.
+            int keySizeBits = ((ECKey) signingKey).getParams().getOrder().bitLength();
+            if (keySizeBits <= 256) {
+                // 256-bit Elliptic Curve is roughly 128-bit strong, meaning SHA-256 is a good fit.
+                return Collections.singletonList(SignatureAlgorithm.ECDSA_WITH_SHA256);
+            } else {
+                // Keys longer than 256 bit need to be paired with a stronger digest to avoid the
+                // digest being the weak link. SHA-512 is the next strongest supported digest.
+                return Collections.singletonList(SignatureAlgorithm.ECDSA_WITH_SHA512);
+            }
+        } else {
+            throw new InvalidKeyException("Unsupported key algorithm: " + keyAlgorithm);
+        }
+    }
+
+    /**
+     * Signs the provided APK using APK Signature Scheme v2 and returns the APK Signing Block
+     * containing the signature.
+     *
+     * @param signerConfigs signer configurations, one for each signer At least one signer config
+     *        must be provided.
+     *
+     * @throws IOException if an I/O error occurs
+     * @throws InvalidKeyException if a signing key is not suitable for this signature scheme or
+     *         cannot be used in general
+     * @throws SignatureException if an error occurs when computing digests of generating
+     *         signatures
+     */
+    public static byte[] generateApkSigningBlock(
+            DataSource beforeCentralDir,
+            DataSource centralDir,
+            DataSource eocd,
+            List<SignerConfig> signerConfigs)
+                        throws IOException, InvalidKeyException, SignatureException {
+        if (signerConfigs.isEmpty()) {
+            throw new IllegalArgumentException(
+                    "No signer configs provided. At least one is required");
+        }
+
+        // Figure out which digest(s) to use for APK contents.
+        Set<ContentDigestAlgorithm> contentDigestAlgorithms = new HashSet<>(1);
+        for (SignerConfig signerConfig : signerConfigs) {
+            for (SignatureAlgorithm signatureAlgorithm : signerConfig.signatureAlgorithms) {
+                contentDigestAlgorithms.add(signatureAlgorithm.getContentDigestAlgorithm());
+            }
+        }
+
+        // Ensure that, when digesting, ZIP End of Central Directory record's Central Directory
+        // offset field is treated as pointing to the offset at which the APK Signing Block will
+        // start.
+        long centralDirOffsetForDigesting = beforeCentralDir.size();
+        ByteBuffer eocdBuf = copyToByteBuffer(eocd);
+        eocdBuf.order(ByteOrder.LITTLE_ENDIAN);
+        ZipUtils.setZipEocdCentralDirectoryOffset(eocdBuf, centralDirOffsetForDigesting);
+
+        // Compute digests of APK contents.
+        Map<ContentDigestAlgorithm, byte[]> contentDigests; // digest algorithm ID -> digest
+        try {
+            contentDigests =
+                    computeContentDigests(
+                            contentDigestAlgorithms,
+                            new DataSource[] {
+                                    beforeCentralDir,
+                                    centralDir,
+                                    DataSources.asDataSource(eocdBuf)});
+        } catch (IOException e) {
+            throw new IOException("Failed to read APK being signed", e);
+        } catch (DigestException e) {
+            throw new SignatureException("Failed to compute digests of APK", e);
+        }
+
+        // Sign the digests and wrap the signatures and signer info into an APK Signing Block.
+        return generateApkSigningBlock(signerConfigs, contentDigests);
+    }
+
+    private static Map<ContentDigestAlgorithm, byte[]> computeContentDigests(
+            Set<ContentDigestAlgorithm> digestAlgorithms,
+            DataSource[] contents) throws IOException, DigestException {
+        // For each digest algorithm the result is computed as follows:
+        // 1. Each segment of contents is split into consecutive chunks of 1 MB in size.
+        //    The final chunk will be shorter iff the length of segment is not a multiple of 1 MB.
+        //    No chunks are produced for empty (zero length) segments.
+        // 2. The digest of each chunk is computed over the concatenation of byte 0xa5, the chunk's
+        //    length in bytes (uint32 little-endian) and the chunk's contents.
+        // 3. The output digest is computed over the concatenation of the byte 0x5a, the number of
+        //    chunks (uint32 little-endian) and the concatenation of digests of chunks of all
+        //    segments in-order.
+
+        long chunkCountLong = 0;
+        for (DataSource input : contents) {
+            chunkCountLong +=
+                    getChunkCount(input.size(), CONTENT_DIGESTED_CHUNK_MAX_SIZE_BYTES);
+        }
+        if (chunkCountLong > Integer.MAX_VALUE) {
+            throw new DigestException("Input too long: " + chunkCountLong + " chunks");
+        }
+        int chunkCount = (int) chunkCountLong;
+
+        ContentDigestAlgorithm[] digestAlgorithmsArray =
+                digestAlgorithms.toArray(new ContentDigestAlgorithm[digestAlgorithms.size()]);
+        MessageDigest[] mds = new MessageDigest[digestAlgorithmsArray.length];
+        byte[][] digestsOfChunks = new byte[digestAlgorithmsArray.length][];
+        int[] digestOutputSizes = new int[digestAlgorithmsArray.length];
+        for (int i = 0; i < digestAlgorithmsArray.length; i++) {
+            ContentDigestAlgorithm digestAlgorithm = digestAlgorithmsArray[i];
+            int digestOutputSizeBytes = digestAlgorithm.getChunkDigestOutputSizeBytes();
+            digestOutputSizes[i] = digestOutputSizeBytes;
+            byte[] concatenationOfChunkCountAndChunkDigests =
+                    new byte[5 + chunkCount * digestOutputSizeBytes];
+            concatenationOfChunkCountAndChunkDigests[0] = 0x5a;
+            setUnsignedInt32LittleEndian(
+                    chunkCount, concatenationOfChunkCountAndChunkDigests, 1);
+            digestsOfChunks[i] = concatenationOfChunkCountAndChunkDigests;
+            String jcaAlgorithm = digestAlgorithm.getJcaMessageDigestAlgorithm();
+            try {
+                mds[i] = MessageDigest.getInstance(jcaAlgorithm);
+            } catch (NoSuchAlgorithmException e) {
+                throw new RuntimeException(jcaAlgorithm + " MessageDigest not supported", e);
+            }
+        }
+
+        MessageDigestSink mdSink = new MessageDigestSink(mds);
+        byte[] chunkContentPrefix = new byte[5];
+        chunkContentPrefix[0] = (byte) 0xa5;
+        int chunkIndex = 0;
+        // Optimization opportunity: digests of chunks can be computed in parallel. However,
+        // determining the number of computations to be performed in parallel is non-trivial. This
+        // depends on a wide range of factors, such as data source type (e.g., in-memory or fetched
+        // from file), CPU/memory/disk cache bandwidth and latency, interconnect architecture of CPU
+        // cores, load on the system from other threads of execution and other processes, size of
+        // input.
+        // For now, we compute these digests sequentially and thus have the luxury of improving
+        // performance by writing the digest of each chunk into a pre-allocated buffer at exactly
+        // the right position. This avoids unnecessary allocations, copying, and enables the final
+        // digest to be more efficient because it's presented with all of its input in one go.
+        for (DataSource input : contents) {
+            long inputOffset = 0;
+            long inputRemaining = input.size();
+            while (inputRemaining > 0) {
+                int chunkSize =
+                        (int) Math.min(inputRemaining, CONTENT_DIGESTED_CHUNK_MAX_SIZE_BYTES);
+                setUnsignedInt32LittleEndian(chunkSize, chunkContentPrefix, 1);
+                for (int i = 0; i < mds.length; i++) {
+                    mds[i].update(chunkContentPrefix);
+                }
+                try {
+                    input.feed(inputOffset, chunkSize, mdSink);
+                } catch (IOException e) {
+                    throw new IOException("Failed to read chunk #" + chunkIndex, e);
+                }
+                for (int i = 0; i < digestAlgorithmsArray.length; i++) {
+                    MessageDigest md = mds[i];
+                    byte[] concatenationOfChunkCountAndChunkDigests = digestsOfChunks[i];
+                    int expectedDigestSizeBytes = digestOutputSizes[i];
+                    int actualDigestSizeBytes =
+                            md.digest(
+                                    concatenationOfChunkCountAndChunkDigests,
+                                    5 + chunkIndex * expectedDigestSizeBytes,
+                                    expectedDigestSizeBytes);
+                    if (actualDigestSizeBytes != expectedDigestSizeBytes) {
+                        throw new RuntimeException(
+                                "Unexpected output size of " + md.getAlgorithm()
+                                        + " digest: " + actualDigestSizeBytes);
+                    }
+                }
+                inputOffset += chunkSize;
+                inputRemaining -= chunkSize;
+                chunkIndex++;
+            }
+        }
+
+        Map<ContentDigestAlgorithm, byte[]> result = new HashMap<>(digestAlgorithmsArray.length);
+        for (int i = 0; i < digestAlgorithmsArray.length; i++) {
+            ContentDigestAlgorithm digestAlgorithm = digestAlgorithmsArray[i];
+            byte[] concatenationOfChunkCountAndChunkDigests = digestsOfChunks[i];
+            MessageDigest md = mds[i];
+            byte[] digest = md.digest(concatenationOfChunkCountAndChunkDigests);
+            result.put(digestAlgorithm, digest);
+        }
+        return result;
+    }
+
+    private static final long getChunkCount(long inputSize, int chunkSize) {
+        return (inputSize + chunkSize - 1) / chunkSize;
+    }
+
+    private static void setUnsignedInt32LittleEndian(int value, byte[] result, int offset) {
+        result[offset] = (byte) (value & 0xff);
+        result[offset + 1] = (byte) ((value >> 8) & 0xff);
+        result[offset + 2] = (byte) ((value >> 16) & 0xff);
+        result[offset + 3] = (byte) ((value >> 24) & 0xff);
+    }
+
+    private static byte[] generateApkSigningBlock(
+            List<SignerConfig> signerConfigs,
+            Map<ContentDigestAlgorithm, byte[]> contentDigests)
+                    throws InvalidKeyException, SignatureException {
+        byte[] apkSignatureSchemeV2Block =
+                generateApkSignatureSchemeV2Block(signerConfigs, contentDigests);
+        return generateApkSigningBlock(apkSignatureSchemeV2Block);
+    }
+
+    private static byte[] generateApkSigningBlock(byte[] apkSignatureSchemeV2Block) {
+        // FORMAT:
+        // uint64:  size (excluding this field)
+        // repeated ID-value pairs:
+        //     uint64:           size (excluding this field)
+        //     uint32:           ID
+        //     (size - 4) bytes: value
+        // uint64:  size (same as the one above)
+        // uint128: magic
+
+        int resultSize =
+                8 // size
+                + 8 + 4 + apkSignatureSchemeV2Block.length // v2Block as ID-value pair
+                + 8 // size
+                + 16 // magic
+                ;
+        ByteBuffer result = ByteBuffer.allocate(resultSize);
+        result.order(ByteOrder.LITTLE_ENDIAN);
+        long blockSizeFieldValue = resultSize - 8;
+        result.putLong(blockSizeFieldValue);
+
+        long pairSizeFieldValue = 4 + apkSignatureSchemeV2Block.length;
+        result.putLong(pairSizeFieldValue);
+        result.putInt(APK_SIGNATURE_SCHEME_V2_BLOCK_ID);
+        result.put(apkSignatureSchemeV2Block);
+
+        result.putLong(blockSizeFieldValue);
+        result.put(APK_SIGNING_BLOCK_MAGIC);
+
+        return result.array();
+    }
+
+    private static byte[] generateApkSignatureSchemeV2Block(
+            List<SignerConfig> signerConfigs,
+            Map<ContentDigestAlgorithm, byte[]> contentDigests)
+                    throws InvalidKeyException, SignatureException {
+        // FORMAT:
+        // * length-prefixed sequence of length-prefixed signer blocks.
+
+        List<byte[]> signerBlocks = new ArrayList<>(signerConfigs.size());
+        int signerNumber = 0;
+        for (SignerConfig signerConfig : signerConfigs) {
+            signerNumber++;
+            byte[] signerBlock;
+            try {
+                signerBlock = generateSignerBlock(signerConfig, contentDigests);
+            } catch (InvalidKeyException e) {
+                throw new InvalidKeyException("Signer #" + signerNumber + " failed", e);
+            } catch (SignatureException e) {
+                throw new SignatureException("Signer #" + signerNumber + " failed", e);
+            }
+            signerBlocks.add(signerBlock);
+        }
+
+        return encodeAsSequenceOfLengthPrefixedElements(
+                new byte[][] {
+                    encodeAsSequenceOfLengthPrefixedElements(signerBlocks),
+                });
+    }
+
+    private static byte[] generateSignerBlock(
+            SignerConfig signerConfig,
+            Map<ContentDigestAlgorithm, byte[]> contentDigests)
+                    throws InvalidKeyException, SignatureException {
+        if (signerConfig.certificates.isEmpty()) {
+            throw new SignatureException("No certificates configured for signer");
+        }
+        PublicKey publicKey = signerConfig.certificates.get(0).getPublicKey();
+
+        byte[] encodedPublicKey = encodePublicKey(publicKey);
+
+        V2SignatureSchemeBlock.SignedData signedData = new V2SignatureSchemeBlock.SignedData();
+        try {
+            signedData.certificates = encodeCertificates(signerConfig.certificates);
+        } catch (CertificateEncodingException e) {
+            throw new SignatureException("Failed to encode certificates", e);
+        }
+
+        List<Pair<Integer, byte[]>> digests =
+                new ArrayList<>(signerConfig.signatureAlgorithms.size());
+        for (SignatureAlgorithm signatureAlgorithm : signerConfig.signatureAlgorithms) {
+            ContentDigestAlgorithm contentDigestAlgorithm =
+                    signatureAlgorithm.getContentDigestAlgorithm();
+            byte[] contentDigest = contentDigests.get(contentDigestAlgorithm);
+            if (contentDigest == null) {
+                throw new RuntimeException(
+                        contentDigestAlgorithm + " content digest for " + signatureAlgorithm
+                                + " not computed");
+            }
+            digests.add(Pair.of(signatureAlgorithm.getId(), contentDigest));
+        }
+        signedData.digests = digests;
+
+        V2SignatureSchemeBlock.Signer signer = new V2SignatureSchemeBlock.Signer();
+        // FORMAT:
+        // * length-prefixed sequence of length-prefixed digests:
+        //   * uint32: signature algorithm ID
+        //   * length-prefixed bytes: digest of contents
+        // * length-prefixed sequence of certificates:
+        //   * length-prefixed bytes: X.509 certificate (ASN.1 DER encoded).
+        // * length-prefixed sequence of length-prefixed additional attributes:
+        //   * uint32: ID
+        //   * (length - 4) bytes: value
+        signer.signedData = encodeAsSequenceOfLengthPrefixedElements(new byte[][] {
+            encodeAsSequenceOfLengthPrefixedPairsOfIntAndLengthPrefixedBytes(signedData.digests),
+            encodeAsSequenceOfLengthPrefixedElements(signedData.certificates),
+            // additional attributes
+            new byte[0],
+        });
+        signer.publicKey = encodedPublicKey;
+        signer.signatures = new ArrayList<>(signerConfig.signatureAlgorithms.size());
+        for (SignatureAlgorithm signatureAlgorithm : signerConfig.signatureAlgorithms) {
+            Pair<String, ? extends AlgorithmParameterSpec> sigAlgAndParams =
+                    signatureAlgorithm.getJcaSignatureAlgorithmAndParams();
+            String jcaSignatureAlgorithm = sigAlgAndParams.getFirst();
+            AlgorithmParameterSpec jcaSignatureAlgorithmParams = sigAlgAndParams.getSecond();
+            byte[] signatureBytes;
+            try {
+                Signature signature = Signature.getInstance(jcaSignatureAlgorithm);
+                signature.initSign(signerConfig.privateKey);
+                if (jcaSignatureAlgorithmParams != null) {
+                    signature.setParameter(jcaSignatureAlgorithmParams);
+                }
+                signature.update(signer.signedData);
+                signatureBytes = signature.sign();
+            } catch (InvalidKeyException e) {
+                throw new InvalidKeyException("Failed sign using " + jcaSignatureAlgorithm, e);
+            } catch (NoSuchAlgorithmException | InvalidAlgorithmParameterException
+                    | SignatureException e) {
+                throw new SignatureException("Failed sign using " + jcaSignatureAlgorithm, e);
+            }
+
+            try {
+                Signature signature = Signature.getInstance(jcaSignatureAlgorithm);
+                signature.initVerify(publicKey);
+                if (jcaSignatureAlgorithmParams != null) {
+                    signature.setParameter(jcaSignatureAlgorithmParams);
+                }
+                signature.update(signer.signedData);
+                if (!signature.verify(signatureBytes)) {
+                    throw new SignatureException("Signature did not verify");
+                }
+            } catch (InvalidKeyException e) {
+                throw new InvalidKeyException("Failed to verify generated " + jcaSignatureAlgorithm
+                        + " signature using public key from certificate", e);
+            } catch (NoSuchAlgorithmException | InvalidAlgorithmParameterException
+                    | SignatureException e) {
+                throw new SignatureException("Failed to verify generated " + jcaSignatureAlgorithm
+                        + " signature using public key from certificate", e);
+            }
+
+            signer.signatures.add(Pair.of(signatureAlgorithm.getId(), signatureBytes));
+        }
+
+        // FORMAT:
+        // * length-prefixed signed data
+        // * length-prefixed sequence of length-prefixed signatures:
+        //   * uint32: signature algorithm ID
+        //   * length-prefixed bytes: signature of signed data
+        // * length-prefixed bytes: public key (X.509 SubjectPublicKeyInfo, ASN.1 DER encoded)
+        return encodeAsSequenceOfLengthPrefixedElements(
+                new byte[][] {
+                    signer.signedData,
+                    encodeAsSequenceOfLengthPrefixedPairsOfIntAndLengthPrefixedBytes(
+                            signer.signatures),
+                    signer.publicKey,
+                });
+    }
+
+    private static final class V2SignatureSchemeBlock {
+        private static final class Signer {
+            public byte[] signedData;
+            public List<Pair<Integer, byte[]>> signatures;
+            public byte[] publicKey;
+        }
+
+        private static final class SignedData {
+            public List<Pair<Integer, byte[]>> digests;
+            public List<byte[]> certificates;
+        }
+    }
+
+    private static byte[] encodePublicKey(PublicKey publicKey) throws InvalidKeyException {
+        byte[] encodedPublicKey = null;
+        if ("X.509".equals(publicKey.getFormat())) {
+            encodedPublicKey = publicKey.getEncoded();
+        }
+        if (encodedPublicKey == null) {
+            try {
+                encodedPublicKey =
+                        KeyFactory.getInstance(publicKey.getAlgorithm())
+                                .getKeySpec(publicKey, X509EncodedKeySpec.class)
+                                .getEncoded();
+            } catch (NoSuchAlgorithmException e) {
+                throw new InvalidKeyException(
+                        "Failed to obtain X.509 encoded form of public key " + publicKey
+                                + " of class " + publicKey.getClass().getName(),
+                        e);
+            } catch (InvalidKeySpecException e) {
+                throw new InvalidKeyException(
+                        "Failed to obtain X.509 encoded form of public key " + publicKey
+                                + " of class " + publicKey.getClass().getName(),
+                        e);
+            }
+        }
+        if ((encodedPublicKey == null) || (encodedPublicKey.length == 0)) {
+            throw new InvalidKeyException(
+                    "Failed to obtain X.509 encoded form of public key " + publicKey
+                            + " of class " + publicKey.getClass().getName());
+        }
+        return encodedPublicKey;
+    }
+
+    private static List<byte[]> encodeCertificates(List<X509Certificate> certificates)
+            throws CertificateEncodingException {
+        List<byte[]> result = new ArrayList<>(certificates.size());
+        for (X509Certificate certificate : certificates) {
+            result.add(certificate.getEncoded());
+        }
+        return result;
+    }
+
+    private static byte[] encodeAsSequenceOfLengthPrefixedElements(List<byte[]> sequence) {
+        return encodeAsSequenceOfLengthPrefixedElements(
+                sequence.toArray(new byte[sequence.size()][]));
+    }
+
+    private static byte[] encodeAsSequenceOfLengthPrefixedElements(byte[][] sequence) {
+        int payloadSize = 0;
+        for (byte[] element : sequence) {
+            payloadSize += 4 + element.length;
+        }
+        ByteBuffer result = ByteBuffer.allocate(payloadSize);
+        result.order(ByteOrder.LITTLE_ENDIAN);
+        for (byte[] element : sequence) {
+            result.putInt(element.length);
+            result.put(element);
+        }
+        return result.array();
+      }
+
+    private static byte[] encodeAsSequenceOfLengthPrefixedPairsOfIntAndLengthPrefixedBytes(
+            List<Pair<Integer, byte[]>> sequence) {
+        int resultSize = 0;
+        for (Pair<Integer, byte[]> element : sequence) {
+            resultSize += 12 + element.getSecond().length;
+        }
+        ByteBuffer result = ByteBuffer.allocate(resultSize);
+        result.order(ByteOrder.LITTLE_ENDIAN);
+        for (Pair<Integer, byte[]> element : sequence) {
+            byte[] second = element.getSecond();
+            result.putInt(8 + second.length);
+            result.putInt(element.getFirst());
+            result.putInt(second.length);
+            result.put(second);
+        }
+        return result.array();
+    }
+
+    private static ByteBuffer copyToByteBuffer(DataSource dataSource) throws IOException {
+        long dataSourceSize = dataSource.size();
+        if (dataSourceSize > Integer.MAX_VALUE) {
+            throw new IllegalArgumentException("Data source too large: " + dataSourceSize);
+        }
+        ByteBuffer result = ByteBuffer.allocate((int) dataSourceSize);
+        dataSource.feed(0, result.remaining(), new ByteBufferSink(result));
+        result.position(0);
+        return result;
+    }
+}
diff --git a/tools/apksigner/core/src/com/android/apksigner/core/internal/jar/ManifestWriter.java b/tools/apksigner/core/src/com/android/apksigner/core/internal/jar/ManifestWriter.java
new file mode 100644
index 0000000..449953a
--- /dev/null
+++ b/tools/apksigner/core/src/com/android/apksigner/core/internal/jar/ManifestWriter.java
@@ -0,0 +1,124 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.apksigner.core.internal.jar;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.util.Map;
+import java.util.Set;
+import java.util.SortedMap;
+import java.util.TreeMap;
+import java.util.jar.Attributes;
+
+/**
+ * Producer of {@code META-INF/MANIFEST.MF} file.
+ */
+public abstract class ManifestWriter {
+
+    private static final byte[] CRLF = new byte[] {'\r', '\n'};
+    private static final int MAX_LINE_LENGTH = 70;
+
+    private ManifestWriter() {}
+
+    public static void writeMainSection(OutputStream out, Attributes attributes)
+            throws IOException {
+
+        // Main section must start with the Manifest-Version attribute.
+        // See https://docs.oracle.com/javase/8/docs/technotes/guides/jar/jar.html#Signed_JAR_File.
+        String manifestVersion = attributes.getValue(Attributes.Name.MANIFEST_VERSION);
+        if (manifestVersion == null) {
+            throw new IllegalArgumentException(
+                    "Mandatory " + Attributes.Name.MANIFEST_VERSION + " attribute missing");
+        }
+        writeAttribute(out, Attributes.Name.MANIFEST_VERSION, manifestVersion);
+
+        if (attributes.size() > 1) {
+            SortedMap<String, String> namedAttributes = getAttributesSortedByName(attributes);
+            namedAttributes.remove(Attributes.Name.MANIFEST_VERSION.toString());
+            writeAttributes(out, namedAttributes);
+        }
+        writeSectionDelimiter(out);
+    }
+
+    public static void writeIndividualSection(OutputStream out, String name, Attributes attributes)
+            throws IOException {
+        writeAttribute(out, "Name", name);
+
+        if (!attributes.isEmpty()) {
+            writeAttributes(out, getAttributesSortedByName(attributes));
+        }
+        writeSectionDelimiter(out);
+    }
+
+    static void writeSectionDelimiter(OutputStream out) throws IOException {
+        out.write(CRLF);
+    }
+
+    static void writeAttribute(OutputStream  out, Attributes.Name name, String value)
+            throws IOException {
+        writeAttribute(out, name.toString(), value);
+    }
+
+    private static void writeAttribute(OutputStream  out, String name, String value)
+            throws IOException {
+        writeLine(out, name + ": " + value);
+    }
+
+    private static void writeLine(OutputStream  out, String line) throws IOException {
+        byte[] lineBytes = line.getBytes("UTF-8");
+        int offset = 0;
+        int remaining = lineBytes.length;
+        boolean firstLine = true;
+        while (remaining > 0) {
+            int chunkLength;
+            if (firstLine) {
+                // First line
+                chunkLength = Math.min(remaining, MAX_LINE_LENGTH);
+            } else {
+                // Continuation line
+                out.write(CRLF);
+                out.write(' ');
+                chunkLength = Math.min(remaining, MAX_LINE_LENGTH - 1);
+            }
+            out.write(lineBytes, offset, chunkLength);
+            offset += chunkLength;
+            remaining -= chunkLength;
+            firstLine = false;
+        }
+        out.write(CRLF);
+    }
+
+    static SortedMap<String, String> getAttributesSortedByName(Attributes attributes) {
+        Set<Map.Entry<Object, Object>> attributesEntries = attributes.entrySet();
+        SortedMap<String, String> namedAttributes = new TreeMap<String, String>();
+        for (Map.Entry<Object, Object> attribute : attributesEntries) {
+            String attrName = attribute.getKey().toString();
+            String attrValue = attribute.getValue().toString();
+            namedAttributes.put(attrName, attrValue);
+        }
+        return namedAttributes;
+    }
+
+    static void writeAttributes(
+            OutputStream out, SortedMap<String, String> attributesSortedByName) throws IOException {
+        for (Map.Entry<String, String> attribute : attributesSortedByName.entrySet()) {
+            String attrName = attribute.getKey();
+            String attrValue = attribute.getValue();
+            writeAttribute(out, attrName, attrValue);
+        }
+    }
+}
diff --git a/tools/apksigner/core/src/com/android/apksigner/core/internal/jar/SignatureFileWriter.java b/tools/apksigner/core/src/com/android/apksigner/core/internal/jar/SignatureFileWriter.java
new file mode 100644
index 0000000..9cd25f3
--- /dev/null
+++ b/tools/apksigner/core/src/com/android/apksigner/core/internal/jar/SignatureFileWriter.java
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.apksigner.core.internal.jar;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.util.SortedMap;
+import java.util.jar.Attributes;
+
+/**
+ * Producer of JAR signature file ({@code *.SF}).
+ */
+public abstract class SignatureFileWriter {
+    private SignatureFileWriter() {}
+
+    public static void writeMainSection(OutputStream out, Attributes attributes)
+            throws IOException {
+
+        // Main section must start with the Signature-Version attribute.
+        // See https://docs.oracle.com/javase/8/docs/technotes/guides/jar/jar.html#Signed_JAR_File.
+        String signatureVersion = attributes.getValue(Attributes.Name.SIGNATURE_VERSION);
+        if (signatureVersion == null) {
+            throw new IllegalArgumentException(
+                    "Mandatory " + Attributes.Name.SIGNATURE_VERSION + " attribute missing");
+        }
+        ManifestWriter.writeAttribute(out, Attributes.Name.SIGNATURE_VERSION, signatureVersion);
+
+        if (attributes.size() > 1) {
+            SortedMap<String, String> namedAttributes =
+                    ManifestWriter.getAttributesSortedByName(attributes);
+            namedAttributes.remove(Attributes.Name.SIGNATURE_VERSION.toString());
+            ManifestWriter.writeAttributes(out, namedAttributes);
+        }
+        writeSectionDelimiter(out);
+    }
+
+    public static void writeIndividualSection(OutputStream out, String name, Attributes attributes)
+            throws IOException {
+        ManifestWriter.writeIndividualSection(out, name, attributes);
+    }
+
+    public static void writeSectionDelimiter(OutputStream out) throws IOException {
+        ManifestWriter.writeSectionDelimiter(out);
+    }
+}
diff --git a/tools/apksigner/core/src/com/android/apksigner/core/internal/util/ByteArrayOutputStreamSink.java b/tools/apksigner/core/src/com/android/apksigner/core/internal/util/ByteArrayOutputStreamSink.java
new file mode 100644
index 0000000..ca79df7
--- /dev/null
+++ b/tools/apksigner/core/src/com/android/apksigner/core/internal/util/ByteArrayOutputStreamSink.java
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.apksigner.core.internal.util;
+
+import com.android.apksigner.core.util.DataSink;
+
+import java.io.ByteArrayOutputStream;
+import java.nio.ByteBuffer;
+
+/**
+ * Data sink which stores all input data into an internal {@link ByteArrayOutputStream}, thus
+ * accepting an arbitrary amount of data.
+ */
+public class ByteArrayOutputStreamSink implements DataSink {
+
+    private final ByteArrayOutputStream mBuf = new ByteArrayOutputStream();
+
+    @Override
+    public void consume(byte[] buf, int offset, int length) {
+        mBuf.write(buf, offset, length);
+    }
+
+    @Override
+    public void consume(ByteBuffer buf) {
+        if (!buf.hasRemaining()) {
+            return;
+        }
+
+        if (buf.hasArray()) {
+            mBuf.write(
+                    buf.array(),
+                    buf.arrayOffset() + buf.position(),
+                    buf.remaining());
+            buf.position(buf.limit());
+        } else {
+            byte[] tmp = new byte[buf.remaining()];
+            buf.get(tmp);
+            mBuf.write(tmp, 0, tmp.length);
+        }
+    }
+
+    /**
+     * Returns the data received so far.
+     */
+    public byte[] getData() {
+        return mBuf.toByteArray();
+    }
+}
diff --git a/tools/apksigner/core/src/com/android/apksigner/core/internal/util/ByteBufferDataSource.java b/tools/apksigner/core/src/com/android/apksigner/core/internal/util/ByteBufferDataSource.java
new file mode 100644
index 0000000..76f4fda
--- /dev/null
+++ b/tools/apksigner/core/src/com/android/apksigner/core/internal/util/ByteBufferDataSource.java
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.apksigner.core.internal.util;
+
+import com.android.apksigner.core.util.DataSink;
+import com.android.apksigner.core.util.DataSource;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+/**
+ * {@link DataSource} backed by a {@link ByteBuffer}.
+ */
+public class ByteBufferDataSource implements DataSource {
+
+    private final ByteBuffer mBuffer;
+    private final long mSize;
+
+    /**
+     * Constructs a new {@code ByteBufferDigestSource} based on the data contained in the provided
+     * buffer between the buffer's position and limit.
+     */
+    public ByteBufferDataSource(ByteBuffer buffer) {
+        mBuffer = buffer.slice();
+        mSize = buffer.remaining();
+    }
+
+    @Override
+    public long size() {
+        return mSize;
+    }
+
+    @Override
+    public void feed(long offset, int size, DataSink sink) throws IOException {
+        if (offset < 0) {
+            throw new IllegalArgumentException("offset: " + offset);
+        }
+        if (size < 0) {
+            throw new IllegalArgumentException("size: " + size);
+        }
+        if (offset > mSize) {
+            throw new IllegalArgumentException(
+                    "offset (" + offset + ") > source size (" + mSize + ")");
+        }
+        long endOffset = offset + size;
+        if (endOffset < offset) {
+            throw new IllegalArgumentException(
+                    "offset (" + offset + ") + size (" + size + ") overflow");
+        }
+        if (endOffset > mSize) {
+            throw new IllegalArgumentException(
+                    "offset (" + offset + ") + size (" + size + ") > source size (" + mSize  +")");
+        }
+
+        int chunkPosition = (int) offset; // safe to downcast because mSize <= Integer.MAX_VALUE
+        int chunkLimit = (int) endOffset; // safe to downcast because mSize <= Integer.MAX_VALUE
+        ByteBuffer chunk;
+        // Creating a slice of ByteBuffer modifies the state of the source ByteBuffer (position
+        // and limit fields, to be more specific). We thus use synchronization around these
+        // state-changing operations to make instances of this class thread-safe.
+        synchronized (mBuffer) {
+            // ByteBuffer.limit(int) and .position(int) check that that the position >= limit
+            // invariant is not broken. Thus, the only way to safely change position and limit
+            // without caring about their current values is to first set position to 0 or set the
+            // limit to capacity.
+            mBuffer.position(0);
+
+            mBuffer.limit(chunkLimit);
+            mBuffer.position(chunkPosition);
+            chunk = mBuffer.slice();
+        }
+
+        sink.consume(chunk);
+    }
+}
diff --git a/tools/apksigner/core/src/com/android/apksigner/core/internal/util/ByteBufferSink.java b/tools/apksigner/core/src/com/android/apksigner/core/internal/util/ByteBufferSink.java
new file mode 100644
index 0000000..8c57905
--- /dev/null
+++ b/tools/apksigner/core/src/com/android/apksigner/core/internal/util/ByteBufferSink.java
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.apksigner.core.internal.util;
+
+import com.android.apksigner.core.util.DataSink;
+
+import java.io.IOException;
+import java.nio.BufferOverflowException;
+import java.nio.ByteBuffer;
+
+/**
+ * Data sink which stores all received data into the associated {@link ByteBuffer}.
+ */
+public class ByteBufferSink implements DataSink {
+
+    private final ByteBuffer mBuffer;
+
+    public ByteBufferSink(ByteBuffer buffer) {
+        mBuffer = buffer;
+    }
+
+    @Override
+    public void consume(byte[] buf, int offset, int length) throws IOException {
+        try {
+            mBuffer.put(buf, offset, length);
+        } catch (BufferOverflowException e) {
+            throw new IOException(
+                    "Insufficient space in output buffer for " + length + " bytes", e);
+        }
+    }
+
+    @Override
+    public void consume(ByteBuffer buf) throws IOException {
+        int length = buf.remaining();
+        try {
+            mBuffer.put(buf);
+        } catch (BufferOverflowException e) {
+            throw new IOException(
+                    "Insufficient space in output buffer for " + length + " bytes", e);
+        }
+    }
+}
diff --git a/tools/apksigner/core/src/com/android/apksigner/core/internal/util/Pair.java b/tools/apksigner/core/src/com/android/apksigner/core/internal/util/Pair.java
new file mode 100644
index 0000000..d59af41
--- /dev/null
+++ b/tools/apksigner/core/src/com/android/apksigner/core/internal/util/Pair.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.apksigner.core.internal.util;
+
+/**
+ * Pair of two elements.
+ */
+public final class Pair<A, B> {
+    private final A mFirst;
+    private final B mSecond;
+
+    private Pair(A first, B second) {
+        mFirst = first;
+        mSecond = second;
+    }
+
+    public static <A, B> Pair<A, B> of(A first, B second) {
+        return new Pair<A, B>(first, second);
+    }
+
+    public A getFirst() {
+        return mFirst;
+    }
+
+    public B getSecond() {
+        return mSecond;
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((mFirst == null) ? 0 : mFirst.hashCode());
+        result = prime * result + ((mSecond == null) ? 0 : mSecond.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        @SuppressWarnings("rawtypes")
+        Pair other = (Pair) obj;
+        if (mFirst == null) {
+            if (other.mFirst != null) {
+                return false;
+            }
+        } else if (!mFirst.equals(other.mFirst)) {
+            return false;
+        }
+        if (mSecond == null) {
+            if (other.mSecond != null) {
+                return false;
+            }
+        } else if (!mSecond.equals(other.mSecond)) {
+            return false;
+        }
+        return true;
+    }
+}
diff --git a/tools/apksigner/core/src/com/android/apksigner/core/internal/zip/ZipUtils.java b/tools/apksigner/core/src/com/android/apksigner/core/internal/zip/ZipUtils.java
new file mode 100644
index 0000000..7b47e50
--- /dev/null
+++ b/tools/apksigner/core/src/com/android/apksigner/core/internal/zip/ZipUtils.java
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.apksigner.core.internal.zip;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+
+/**
+ * Assorted ZIP format helpers.
+ *
+ * <p>NOTE: Most helper methods operating on {@code ByteBuffer} instances expect that the byte
+ * order of these buffers is little-endian.
+ */
+public abstract class ZipUtils {
+    private ZipUtils() {}
+
+    private static final int ZIP_EOCD_CENTRAL_DIR_OFFSET_FIELD_OFFSET = 16;
+
+    /**
+     * Sets the offset of the start of the ZIP Central Directory in the archive.
+     *
+     * <p>NOTE: Byte order of {@code zipEndOfCentralDirectory} must be little-endian.
+     */
+    public static void setZipEocdCentralDirectoryOffset(
+            ByteBuffer zipEndOfCentralDirectory, long offset) {
+        assertByteOrderLittleEndian(zipEndOfCentralDirectory);
+        setUnsignedInt32(
+                zipEndOfCentralDirectory,
+                zipEndOfCentralDirectory.position() + ZIP_EOCD_CENTRAL_DIR_OFFSET_FIELD_OFFSET,
+                offset);
+    }
+
+    private static void assertByteOrderLittleEndian(ByteBuffer buffer) {
+        if (buffer.order() != ByteOrder.LITTLE_ENDIAN) {
+            throw new IllegalArgumentException("ByteBuffer byte order must be little endian");
+        }
+    }
+
+    private static void setUnsignedInt32(ByteBuffer buffer, int offset, long value) {
+        if ((value < 0) || (value > 0xffffffffL)) {
+            throw new IllegalArgumentException("uint32 value of out range: " + value);
+        }
+        buffer.putInt(buffer.position() + offset, (int) value);
+    }
+}
\ No newline at end of file
diff --git a/tools/apksigner/core/src/com/android/apksigner/core/util/DataSink.java b/tools/apksigner/core/src/com/android/apksigner/core/util/DataSink.java
new file mode 100644
index 0000000..35a61fc
--- /dev/null
+++ b/tools/apksigner/core/src/com/android/apksigner/core/util/DataSink.java
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.apksigner.core.util;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+/**
+ * Consumer of input data which may be provided in one go or in chunks.
+ */
+public interface DataSink {
+
+    /**
+     * Consumes the provided chunk of data.
+     *
+     * <p>This data sink guarantees to not hold references to the provided buffer after this method
+     * terminates.
+     */
+    void consume(byte[] buf, int offset, int length) throws IOException;
+
+    /**
+     * Consumes all remaining data in the provided buffer and advances the buffer's position
+     * to the buffer's limit.
+     *
+     * <p>This data sink guarantees to not hold references to the provided buffer after this method
+     * terminates.
+     */
+    void consume(ByteBuffer buf) throws IOException;
+}
diff --git a/tools/apksigner/core/src/com/android/apksigner/core/util/DataSource.java b/tools/apksigner/core/src/com/android/apksigner/core/util/DataSource.java
new file mode 100644
index 0000000..04560cb
--- /dev/null
+++ b/tools/apksigner/core/src/com/android/apksigner/core/util/DataSource.java
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.apksigner.core.util;
+
+import java.io.IOException;
+
+/**
+ * Abstract representation of a source of data.
+ *
+ * <p>This abstraction serves three purposes:
+ * <ul>
+ * <li>Transparent handling of different types of sources, such as {@code byte[]},
+ *     {@link java.nio.ByteBuffer}, {@link java.io.RandomAccessFile}, memory-mapped file.</li>
+ * <li>Support sources larger than 2 GB. If all sources were smaller than 2 GB, {@code ByteBuffer}
+ *     may have worked as the unifying abstraction.</li>
+ * <li>Support sources which do not fit into logical memory as a contiguous region.</li>
+ * </ul>
+ */
+public interface DataSource {
+
+    /**
+     * Returns the amount of data (in bytes) contained in this data source.
+     */
+    long size();
+
+    /**
+     * Feeds the specified chunk from this data source into the provided sink.
+     *
+     * @param offset index (in bytes) at which the chunk starts inside data source
+     * @param size size (in bytes) of the chunk
+     */
+    void feed(long offset, int size, DataSink sink) throws IOException;
+}
diff --git a/tools/apksigner/core/src/com/android/apksigner/core/util/DataSources.java b/tools/apksigner/core/src/com/android/apksigner/core/util/DataSources.java
new file mode 100644
index 0000000..978afae
--- /dev/null
+++ b/tools/apksigner/core/src/com/android/apksigner/core/util/DataSources.java
@@ -0,0 +1,23 @@
+package com.android.apksigner.core.util;
+
+import com.android.apksigner.core.internal.util.ByteBufferDataSource;
+
+import java.nio.ByteBuffer;
+
+/**
+ * Utility methods for working with {@link DataSource} abstraction.
+ */
+public abstract class DataSources {
+    private DataSources() {}
+
+    /**
+     * Returns a {@link DataSource} backed by the provided {@link ByteBuffer}. The data source
+     * represents the data contained between the position and limit of the buffer.
+     */
+    public static DataSource asDataSource(ByteBuffer buffer) {
+        if (buffer == null) {
+            throw new NullPointerException();
+        }
+        return new ByteBufferDataSource(buffer);
+    }
+}
diff --git a/tools/releasetools/add_img_to_target_files.py b/tools/releasetools/add_img_to_target_files.py
index f98a281..9e44263 100755
--- a/tools/releasetools/add_img_to_target_files.py
+++ b/tools/releasetools/add_img_to_target_files.py
@@ -395,8 +395,9 @@
     banner("partition-table")
     AddPartitionTable(output_zip)
 
-  # For devices using A/B update, copy over images from RADIO/ to IMAGES/ and
-  # make sure we have all the needed images ready under IMAGES/.
+  # For devices using A/B update, copy over images from RADIO/ and/or
+  # VENDOR_IMAGES/ to IMAGES/ and make sure we have all the needed
+  # images ready under IMAGES/. All images should have '.img' as extension.
   ab_partitions = os.path.join(OPTIONS.input_tmp, "META", "ab_partitions.txt")
   if os.path.exists(ab_partitions):
     with open(ab_partitions, 'r') as f:
@@ -404,9 +405,17 @@
     for line in lines:
       img_name = line.strip() + ".img"
       img_radio_path = os.path.join(OPTIONS.input_tmp, "RADIO", img_name)
+      img_vendor_dir = os.path.join(
+        OPTIONS.input_tmp, "VENDOR_IMAGES")
       if os.path.exists(img_radio_path):
         common.ZipWrite(output_zip, img_radio_path,
                         os.path.join("IMAGES", img_name))
+      else:
+        for root, _, files in os.walk(img_vendor_dir):
+          if img_name in files:
+            common.ZipWrite(output_zip, os.path.join(root, img_name),
+              os.path.join("IMAGES", img_name))
+            break
 
       # Zip spec says: All slashes MUST be forward slashes.
       img_path = 'IMAGES/' + img_name
diff --git a/tools/releasetools/build_image.py b/tools/releasetools/build_image.py
index 4ff8c43..abb23d1 100755
--- a/tools/releasetools/build_image.py
+++ b/tools/releasetools/build_image.py
@@ -378,6 +378,8 @@
     build_command.extend(["-m", prop_dict["mount_point"]])
     if target_out:
       build_command.extend(["-d", target_out])
+    if fs_config:
+      build_command.extend(["-C", fs_config])
     if "selinux_fc" in prop_dict:
       build_command.extend(["-c", prop_dict["selinux_fc"]])
     if "squashfs_compressor" in prop_dict:
diff --git a/tools/rgb2565/to565.c b/tools/rgb2565/to565.c
index abf9cdb..94d62ef 100644
--- a/tools/rgb2565/to565.c
+++ b/tools/rgb2565/to565.c
@@ -65,11 +65,11 @@
         out = to565(rb, gb, bb);
         write(1, &out, 2);
 
-#define apply_error(ch) {                                               \
-            next_error[(i-1)*3+ch] += e * 3 / 16;                       \
-            next_error[(i)*3+ch] += e * 5 / 16;                         \
-            next_error[(i+1)*3+ch] += e * 1 / 16;                       \
-            error[(i+1)*3+ch] += e - ((e*1/16) + (e*3/16) + (e*5/16));  \
+#define apply_error(ch) {                                                \
+            next_error[(i-1)*3+(ch)] += e * 3 / 16;                      \
+            next_error[(i)*3+(ch)] += e * 5 / 16;                        \
+            next_error[(i+1)*3+(ch)] += e * 1 / 16;                      \
+            error[(i+1)*3+(ch)] += e - ((e*1/16) + (e*3/16) + (e*5/16)); \
         }
 
         e = r - from565_r(out);
diff --git a/tools/warn.py b/tools/warn.py
index 14b3f48..a4a9e16 100755
--- a/tools/warn.py
+++ b/tools/warn.py
@@ -1,12 +1,20 @@
 #!/usr/bin/env python
 # This file uses the following encoding: utf-8
 
+import argparse
 import sys
 import re
 
-if len(sys.argv) == 1:
-    print 'usage: ' + sys.argv[0] + ' <build.log>'
-    sys.exit()
+parser = argparse.ArgumentParser(description='Convert a build log into HTML')
+parser.add_argument('--url',
+                    help='Root URL of an Android source code tree prefixed '
+                    'before files in warnings')
+parser.add_argument('--separator',
+                    help='Separator between the end of a URL and the line '
+                    'number argument. e.g. #')
+parser.add_argument(dest='buildlog', metavar='build.log',
+                    help='Path to build.log file')
+args = parser.parse_args()
 
 # if you add another level, don't forget to give it a color below
 class severity:
@@ -303,6 +311,1003 @@
     { 'category':'java',    'severity':severity.MEDIUM,   'members':[], 'option':'',
         'description':'Java: Unchecked conversion',
         'patterns':[r".*: warning: \[unchecked\] unchecked conversion"] },
+
+    # Warnings from Error Prone.
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description': 'Java: Use of deprecated member',
+     'patterns': [r'.*: warning: \[deprecation\] .+']},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description': 'Java: Unchecked conversion',
+     'patterns': [r'.*: warning: \[unchecked\] .+']},
+
+    # Warnings from Error Prone (auto generated list).
+    {'category': 'java',
+     'severity': severity.LOW,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Deprecated item is not annotated with @Deprecated',
+     'patterns': [r".*: warning: \[DepAnn\] .+"]},
+    {'category': 'java',
+     'severity': severity.LOW,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Fallthrough warning suppression has no effect if warning is suppressed',
+     'patterns': [r".*: warning: \[FallthroughSuppression\] .+"]},
+    {'category': 'java',
+     'severity': severity.LOW,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Prefer \'L\' to \'l\' for the suffix to long literals',
+     'patterns': [r".*: warning: \[LongLiteralLowerCaseSuffix\] .+"]},
+    {'category': 'java',
+     'severity': severity.LOW,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: @Binds is a more efficient and declaritive mechanism for delegating a binding.',
+     'patterns': [r".*: warning: \[UseBinds\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Assertions may be disabled at runtime and do not guarantee that execution will halt here; consider throwing an exception instead',
+     'patterns': [r".*: warning: \[AssertFalse\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Classes that implement Annotation must override equals and hashCode. Consider using AutoAnnotation instead of implementing Annotation by hand.',
+     'patterns': [r".*: warning: \[BadAnnotationImplementation\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: BigDecimal(double) and BigDecimal.valueOf(double) may lose precision, prefer BigDecimal(String) or BigDecimal(long)',
+     'patterns': [r".*: warning: \[BigDecimalLiteralDouble\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Mockito cannot mock final classes',
+     'patterns': [r".*: warning: \[CannotMockFinalClass\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: This code, which counts elements using a loop, can be replaced by a simpler library method',
+     'patterns': [r".*: warning: \[ElementsCountedInLoop\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Empty top-level type declaration',
+     'patterns': [r".*: warning: \[EmptyTopLevelDeclaration\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Classes that override equals should also override hashCode.',
+     'patterns': [r".*: warning: \[EqualsHashCode\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: An equality test between objects with incompatible types always returns false',
+     'patterns': [r".*: warning: \[EqualsIncompatibleType\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: If you return or throw from a finally, then values returned or thrown from the try-catch block will be ignored. Consider using try-with-resources instead.',
+     'patterns': [r".*: warning: \[Finally\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: This annotation has incompatible modifiers as specified by its @IncompatibleModifiers annotation',
+     'patterns': [r".*: warning: \[IncompatibleModifiers\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Class should not implement both `Iterable` and `Iterator`',
+     'patterns': [r".*: warning: \[IterableAndIterator\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Floating-point comparison without error tolerance',
+     'patterns': [r".*: warning: \[JUnit3FloatingPointComparisonWithoutDelta\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Test class inherits from JUnit 3\'s TestCase but has JUnit 4 @Test annotations.',
+     'patterns': [r".*: warning: \[JUnitAmbiguousTestClass\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Enum switch statement is missing cases',
+     'patterns': [r".*: warning: \[MissingCasesInEnumSwitch\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Not calling fail() when expecting an exception masks bugs',
+     'patterns': [r".*: warning: \[MissingFail\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: method overrides method in supertype; expected @Override',
+     'patterns': [r".*: warning: \[MissingOverride\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Source files should not contain multiple top-level class declarations',
+     'patterns': [r".*: warning: \[MultipleTopLevelClasses\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: This update of a volatile variable is non-atomic',
+     'patterns': [r".*: warning: \[NonAtomicVolatileUpdate\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Static import of member uses non-canonical name',
+     'patterns': [r".*: warning: \[NonCanonicalStaticMemberImport\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: equals method doesn\'t override Object.equals',
+     'patterns': [r".*: warning: \[NonOverridingEquals\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Constructors should not be annotated with @Nullable since they cannot return null',
+     'patterns': [r".*: warning: \[NullableConstructor\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: @Nullable should not be used for primitive types since they cannot be null',
+     'patterns': [r".*: warning: \[NullablePrimitive\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: void-returning methods should not be annotated with @Nullable, since they cannot return null',
+     'patterns': [r".*: warning: \[NullableVoid\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Package names should match the directory they are declared in',
+     'patterns': [r".*: warning: \[PackageLocation\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Second argument to Preconditions.* is a call to String.format(), which can be unwrapped',
+     'patterns': [r".*: warning: \[PreconditionsErrorMessageEagerEvaluation\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Preconditions only accepts the %s placeholder in error message strings',
+     'patterns': [r".*: warning: \[PreconditionsInvalidPlaceholder\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Passing a primitive array to a varargs method is usually wrong',
+     'patterns': [r".*: warning: \[PrimitiveArrayPassedToVarargsMethod\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Protobuf fields cannot be null, so this check is redundant',
+     'patterns': [r".*: warning: \[ProtoFieldPreconditionsCheckNotNull\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: This annotation is missing required modifiers as specified by its @RequiredModifiers annotation',
+     'patterns': [r".*: warning: \[RequiredModifiers\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: A static variable or method should not be accessed from an object instance',
+     'patterns': [r".*: warning: \[StaticAccessedFromInstance\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: String comparison using reference equality instead of value equality',
+     'patterns': [r".*: warning: \[StringEquality\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Declaring a type parameter that is only used in the return type is a misuse of generics: operations on the type parameter are unchecked, it hides unsafe casts at invocations of the method, and it interacts badly with method overload resolution.',
+     'patterns': [r".*: warning: \[TypeParameterUnusedInFormals\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Using static imports for types is unnecessary',
+     'patterns': [r".*: warning: \[UnnecessaryStaticImport\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Unsynchronized method overrides a synchronized method.',
+     'patterns': [r".*: warning: \[UnsynchronizedOverridesSynchronized\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Non-constant variable missing @Var annotation',
+     'patterns': [r".*: warning: \[Var\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Because of spurious wakeups, Object.wait() and Condition.await() must always be called in a loop',
+     'patterns': [r".*: warning: \[WaitNotInLoop\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Subclasses of Fragment must be instantiable via Class#newInstance(): the class must be public, static and have a public nullary constructor',
+     'patterns': [r".*: warning: \[FragmentNotInstantiable\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Hardcoded reference to /sdcard',
+     'patterns': [r".*: warning: \[HardCodedSdCardPath\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Incompatible type as argument to Object-accepting Java collections method',
+     'patterns': [r".*: warning: \[CollectionIncompatibleType\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: @AssistedInject and @Inject should not be used on different constructors in the same class.',
+     'patterns': [r".*: warning: \[AssistedInjectAndInjectOnConstructors\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Although Guice allows injecting final fields, doing so is not recommended because the injected value may not be visible to other threads.',
+     'patterns': [r".*: warning: \[GuiceInjectOnFinalField\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: This method is not annotated with @Inject, but it overrides a method that is annotated with @com.google.inject.Inject. Guice will inject this method, and it is recommended to annotate it explicitly.',
+     'patterns': [r".*: warning: \[OverridesGuiceInjectableMethod\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Double-checked locking on non-volatile fields is unsafe',
+     'patterns': [r".*: warning: \[DoubleCheckedLocking\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Writes to static fields should not be guarded by instance locks',
+     'patterns': [r".*: warning: \[StaticGuardedByInstance\] .+"]},
+    {'category': 'java',
+     'severity': severity.MEDIUM,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Synchronizing on non-final fields is not safe: if the field is ever updated, different threads may end up locking on different objects.',
+     'patterns': [r".*: warning: \[SynchronizeOnNonFinalField\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Reference equality used to compare arrays',
+     'patterns': [r".*: warning: \[ArrayEquals\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: hashcode method on array does not hash array contents',
+     'patterns': [r".*: warning: \[ArrayHashCode\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Calling toString on an array does not provide useful information',
+     'patterns': [r".*: warning: \[ArrayToString.*\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Arrays.asList does not autobox primitive arrays, as one might expect.',
+     'patterns': [r".*: warning: \[ArraysAsListPrimitiveArray\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: AsyncCallable should not return a null Future, only a Future whose result is null.',
+     'patterns': [r".*: warning: \[AsyncCallableReturnsNull\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: AsyncFunction should not return a null Future, only a Future whose result is null.',
+     'patterns': [r".*: warning: \[AsyncFunctionReturnsNull\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Possible sign flip from narrowing conversion',
+     'patterns': [r".*: warning: \[BadComparable\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Shift by an amount that is out of range',
+     'patterns': [r".*: warning: \[BadShiftAmount\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: valueOf provides better time and space performance',
+     'patterns': [r".*: warning: \[BoxedPrimitiveConstructor\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: The called constructor accepts a parameter with the same name and type as one of its caller\'s parameters, but its caller doesn\'t pass that parameter to it.  It\'s likely that it was intended to.',
+     'patterns': [r".*: warning: \[ChainingConstructorIgnoresParameter\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Ignored return value of method that is annotated with @CheckReturnValue',
+     'patterns': [r".*: warning: \[CheckReturnValue\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Inner class is non-static but does not reference enclosing class',
+     'patterns': [r".*: warning: \[ClassCanBeStatic\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: The source file name should match the name of the top-level class it contains',
+     'patterns': [r".*: warning: \[ClassName\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: This comparison method violates the contract',
+     'patterns': [r".*: warning: \[ComparisonContractViolated\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Comparison to value that is out of range for the compared type',
+     'patterns': [r".*: warning: \[ComparisonOutOfRange\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Non-compile-time constant expression passed to parameter with @CompileTimeConstant type annotation.',
+     'patterns': [r".*: warning: \[CompileTimeConstant\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Exception created but not thrown',
+     'patterns': [r".*: warning: \[DeadException\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Division by integer literal zero',
+     'patterns': [r".*: warning: \[DivZero\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Empty statement after if',
+     'patterns': [r".*: warning: \[EmptyIf\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: == NaN always returns false; use the isNaN methods instead',
+     'patterns': [r".*: warning: \[EqualsNaN\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Method annotated @ForOverride must be protected or package-private and only invoked from declaring class',
+     'patterns': [r".*: warning: \[ForOverride\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Futures.getChecked requires a checked exception type with a standard constructor.',
+     'patterns': [r".*: warning: \[FuturesGetCheckedIllegalExceptionType\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Calling getClass() on an object of type Class returns the Class object for java.lang.Class; you probably meant to operate on the object directly',
+     'patterns': [r".*: warning: \[GetClassOnClass\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: An object is tested for equality to itself using Guava Libraries',
+     'patterns': [r".*: warning: \[GuavaSelfEquals\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: contains() is a legacy method that is equivalent to containsValue()',
+     'patterns': [r".*: warning: \[HashtableContains\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Cipher.getInstance() is invoked using either the default settings or ECB mode',
+     'patterns': [r".*: warning: \[InsecureCipherMode\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Invalid syntax used for a regular expression',
+     'patterns': [r".*: warning: \[InvalidPatternSyntax\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: The argument to Class#isInstance(Object) should not be a Class',
+     'patterns': [r".*: warning: \[IsInstanceOfClass\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: jMock tests must have a @RunWith(JMock.class) annotation, or the Mockery field must have a @Rule JUnit annotation',
+     'patterns': [r".*: warning: \[JMockTestWithoutRunWithOrRuleAnnotation\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Test method will not be run; please prefix name with "test"',
+     'patterns': [r".*: warning: \[JUnit3TestNotRun\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: setUp() method will not be run; Please add a @Before annotation',
+     'patterns': [r".*: warning: \[JUnit4SetUpNotRun\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: tearDown() method will not be run; Please add an @After annotation',
+     'patterns': [r".*: warning: \[JUnit4TearDownNotRun\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Test method will not be run; please add @Test annotation',
+     'patterns': [r".*: warning: \[JUnit4TestNotRun\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Printf-like format string does not match its arguments',
+     'patterns': [r".*: warning: \[MalformedFormatString\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Use of "YYYY" (week year) in a date pattern without "ww" (week in year). You probably meant to use "yyyy" (year) instead.',
+     'patterns': [r".*: warning: \[MisusedWeekYear\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: A bug in Mockito will cause this test to fail at runtime with a ClassCastException',
+     'patterns': [r".*: warning: \[MockitoCast\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Missing method call for verify(mock) here',
+     'patterns': [r".*: warning: \[MockitoUsage\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Modifying a collection with itself',
+     'patterns': [r".*: warning: \[ModifyingCollectionWithItself\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Compound assignments to bytes, shorts, chars, and floats hide dangerous casts',
+     'patterns': [r".*: warning: \[NarrowingCompoundAssignment\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: @NoAllocation was specified on this method, but something was found that would trigger an allocation',
+     'patterns': [r".*: warning: \[NoAllocation\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Static import of type uses non-canonical name',
+     'patterns': [r".*: warning: \[NonCanonicalStaticImport\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: @CompileTimeConstant parameters should be final',
+     'patterns': [r".*: warning: \[NonFinalCompileTimeConstant\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Calling getAnnotation on an annotation that is not retained at runtime.',
+     'patterns': [r".*: warning: \[NonRuntimeAnnotation\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Numeric comparison using reference equality instead of value equality',
+     'patterns': [r".*: warning: \[NumericEquality\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Comparison using reference equality instead of value equality',
+     'patterns': [r".*: warning: \[OptionalEquality\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Varargs doesn\'t agree for overridden method',
+     'patterns': [r".*: warning: \[Overrides\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Literal passed as first argument to Preconditions.checkNotNull() can never be null',
+     'patterns': [r".*: warning: \[PreconditionsCheckNotNull\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: First argument to `Preconditions.checkNotNull()` is a primitive rather than an object reference',
+     'patterns': [r".*: warning: \[PreconditionsCheckNotNullPrimitive\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Protobuf fields cannot be null',
+     'patterns': [r".*: warning: \[ProtoFieldNullComparison\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Comparing protobuf fields of type String using reference equality',
+     'patterns': [r".*: warning: \[ProtoStringFieldReferenceEquality\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java:  Check for non-whitelisted callers to RestrictedApiChecker.',
+     'patterns': [r".*: warning: \[RestrictedApiChecker\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Return value of this method must be used',
+     'patterns': [r".*: warning: \[ReturnValueIgnored\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Variable assigned to itself',
+     'patterns': [r".*: warning: \[SelfAssignment\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: An object is compared to itself',
+     'patterns': [r".*: warning: \[SelfComparision\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Variable compared to itself',
+     'patterns': [r".*: warning: \[SelfEquality\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: An object is tested for equality to itself',
+     'patterns': [r".*: warning: \[SelfEquals\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Comparison of a size >= 0 is always true, did you intend to check for non-emptiness?',
+     'patterns': [r".*: warning: \[SizeGreaterThanOrEqualsZero\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Calling toString on a Stream does not provide useful information',
+     'patterns': [r".*: warning: \[StreamToString\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: StringBuilder does not have a char constructor; this invokes the int constructor.',
+     'patterns': [r".*: warning: \[StringBuilderInitWithChar\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Suppressing "deprecated" is probably a typo for "deprecation"',
+     'patterns': [r".*: warning: \[SuppressWarningsDeprecated\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: throwIfUnchecked(knownCheckedException) is a no-op.',
+     'patterns': [r".*: warning: \[ThrowIfUncheckedKnownChecked\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Catching Throwable/Error masks failures from fail() or assert*() in the try block',
+     'patterns': [r".*: warning: \[TryFailThrowable\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Type parameter used as type qualifier',
+     'patterns': [r".*: warning: \[TypeParameterQualifier\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Non-generic methods should not be invoked with type arguments',
+     'patterns': [r".*: warning: \[UnnecessaryTypeArgument\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Instance created but never used',
+     'patterns': [r".*: warning: \[UnusedAnonymousClass\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Use of wildcard imports is forbidden',
+     'patterns': [r".*: warning: \[WildcardImport\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Method parameter has wrong package',
+     'patterns': [r".*: warning: \[ParameterPackage\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Certain resources in `android.R.string` have names that do not match their content',
+     'patterns': [r".*: warning: \[MislabeledAndroidString\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Return value of android.graphics.Rect.intersect() must be checked',
+     'patterns': [r".*: warning: \[RectIntersectReturnValueIgnored\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Invalid printf-style format string',
+     'patterns': [r".*: warning: \[FormatString\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: @AssistedInject and @Inject cannot be used on the same constructor.',
+     'patterns': [r".*: warning: \[AssistedInjectAndInjectOnSameConstructor\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Injected constructors cannot be optional nor have binding annotations',
+     'patterns': [r".*: warning: \[InjectedConstructorAnnotations\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: The target of a scoping annotation must be set to METHOD and/or TYPE.',
+     'patterns': [r".*: warning: \[InjectInvalidTargetingOnScopingAnnotation\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Abstract methods are not injectable with javax.inject.Inject.',
+     'patterns': [r".*: warning: \[JavaxInjectOnAbstractMethod\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: @javax.inject.Inject cannot be put on a final field.',
+     'patterns': [r".*: warning: \[JavaxInjectOnFinalField\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: A class may not have more than one injectable constructor.',
+     'patterns': [r".*: warning: \[MoreThanOneInjectableConstructor\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Using more than one qualifier annotation on the same element is not allowed.',
+     'patterns': [r".*: warning: \[InjectMoreThanOneQualifier\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: A class can be annotated with at most one scope annotation',
+     'patterns': [r".*: warning: \[InjectMoreThanOneScopeAnnotationOnClass\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Annotations cannot be both Qualifiers/BindingAnnotations and Scopes',
+     'patterns': [r".*: warning: \[OverlappingQualifierAndScopeAnnotation\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Scope annotation on an interface or abstact class is not allowed',
+     'patterns': [r".*: warning: \[InjectScopeAnnotationOnInterfaceOrAbstractClass\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Scoping and qualifier annotations must have runtime retention.',
+     'patterns': [r".*: warning: \[InjectScopeOrQualifierAnnotationRetention\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Dagger @Provides methods may not return null unless annotated with @Nullable',
+     'patterns': [r".*: warning: \[DaggerProvidesNull\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Scope annotation on implementation class of AssistedInject factory is not allowed',
+     'patterns': [r".*: warning: \[GuiceAssistedInjectScoping\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: A constructor cannot have two @Assisted parameters of the same type unless they are disambiguated with named @Assisted annotations. ',
+     'patterns': [r".*: warning: \[GuiceAssistedParameters\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: This method is not annotated with @Inject, but it overrides a  method that is  annotated with @javax.inject.Inject.',
+     'patterns': [r".*: warning: \[OverridesJavaxInjectableMethod\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Checks for unguarded accesses to fields and methods with @GuardedBy annotations',
+     'patterns': [r".*: warning: \[GuardedByChecker\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Invalid @GuardedBy expression',
+     'patterns': [r".*: warning: \[GuardedByValidator\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: Type declaration annotated with @Immutable is not immutable',
+     'patterns': [r".*: warning: \[Immutable\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: This method does not acquire the locks specified by its @LockMethod annotation',
+     'patterns': [r".*: warning: \[LockMethodChecker\] .+"]},
+    {'category': 'java',
+     'severity': severity.HIGH,
+     'members': [],
+     'option': '',
+     'description':
+         'Java: This method does not acquire the locks specified by its @UnlockMethod annotation',
+     'patterns': [r".*: warning: \[UnlockMethod\] .+"]},
+
+    {'category': 'java',
+     'severity': severity.UNKNOWN,
+     'members': [],
+     'option': '',
+     'description': 'Java: Unclassified/unrecognized warnings',
+     'patterns': [r".*: warning: \[.+\] .+"]},
+
     { 'category':'aapt',    'severity':severity.MEDIUM,   'members':[], 'option':'',
         'description':'aapt: No default translation',
         'patterns':[r".*: warning: string '.+' has no default translation in .*"] },
@@ -698,7 +1703,7 @@
     output('<tr bgcolor="' + row_colors[cur_row_color] + '"><td colspan="2">',)
     cur_row_color = 1 - cur_row_color
     output(text,)
-    output('</td></tr>')
+    output('</td></tr>\n')
 
 def begintable(text, backgroundcolor, extraanchor):
     global anchor
@@ -796,6 +1801,19 @@
     if tablestarted:
         endtable()
 
+def warningwithurl(line):
+    if not args.url:
+        return line
+    m = re.search( r'^([^ :]+):(\d+):(.+)', line, re.M|re.I)
+    if not m:
+        return line
+    filepath = m.group(1)
+    linenumber = m.group(2)
+    warning = m.group(3)
+    if args.separator:
+        return '<a href="' + args.url + '/' + filepath + args.separator + linenumber + '">' + filepath + ':' + linenumber + '</a>:' + warning
+    else:
+        return '<a href="' + args.url + '/' + filepath + '">' + filepath + '</a>:' + linenumber + ':' + warning
 
 # dump a category, provided it is not marked as 'SKIP' and has more than 0 occurrences
 def dumpcategory(cat):
@@ -805,7 +1823,7 @@
             header[1:1] = [' (related option: ' + cat['option'] +')']
         begintable(header, colorforseverity(cat['severity']), cat['anchor'])
         for i in cat['members']:
-            tablerow(i)
+            tablerow(warningwithurl(i))
         endtable()
 
 
@@ -835,7 +1853,7 @@
         for pat in i['patterns']:
             i['compiledpatterns'].append(re.compile(pat))
 
-infile = open(sys.argv[1], 'r')
+infile = open(args.buildlog, 'r')
 warnings = []
 
 platformversion = 'unknown'
@@ -874,6 +1892,9 @@
 # dump the html output to stdout
 dumphtmlprologue('Warnings for ' + platformversion + ' - ' + targetproduct + ' - ' + targetvariant)
 dumpstats()
+# sort table based on number of members once dumpstats has deduplicated the
+# members.
+warnpatterns.sort(reverse=True, key=lambda i: len(i['members']))
 dumptoc()
 dumpseverity(severity.FIXMENOW)
 dumpseverity(severity.HIGH)
@@ -883,4 +1904,3 @@
 dumpseverity(severity.HARMLESS)
 dumpseverity(severity.UNKNOWN)
 dumpfixed()
-