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b069b31a2c
Allows OTA updates to be secured via signature checks, without requiring the overhead or complexity of a full secure boot implementation. Uses same signing mechanisms (build system and/or espsecure.py as Secure Boot). Requires: * [ ] More testing * [ ] Documentation
46 lines
1.5 KiB
Makefile
46 lines
1.5 KiB
Makefile
COMPONENT_ADD_INCLUDEDIRS := include
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COMPONENT_PRIV_INCLUDEDIRS := include_priv
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ifdef IS_BOOTLOADER_BUILD
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# share "private" headers with the bootloader component
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# eventual goal: all functionality that needs this lives in bootloader_support
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COMPONENT_ADD_INCLUDEDIRS += include_priv
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endif
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COMPONENT_SRCDIRS := src
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#
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# Secure boot signing key support
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#
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ifdef CONFIG_SECURE_SIGNED_APPS
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# this path is created relative to the component build directory
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SECURE_BOOT_VERIFICATION_KEY := $(abspath signature_verification_key.bin)
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ifdef CONFIG_SECURE_BOOT_BUILD_SIGNED_BINARIES
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# verification key derived from signing key.
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$(SECURE_BOOT_VERIFICATION_KEY): $(SECURE_BOOT_SIGNING_KEY) $(SDKCONFIG_MAKEFILE)
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$(ESPSECUREPY) extract_public_key --keyfile $< $@
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else
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# find the configured public key file
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ORIG_SECURE_BOOT_VERIFICATION_KEY := $(call resolvepath,$(call dequote,$(CONFIG_SECURE_BOOT_VERIFICATION_KEY)),$(PROJECT_PATH))
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$(ORIG_SECURE_BOOT_VERIFICATION_KEY):
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@echo "Secure boot verification public key '$@' missing."
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@echo "This can be extracted from the private signing key, see"
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@echo "docs/security/secure-boot.rst for details."
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exit 1
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# copy it into the build dir, so the secure boot verification key has
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# a predictable file name
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$(SECURE_BOOT_VERIFICATION_KEY): $(ORIG_SECURE_BOOT_VERIFICATION_KEY) $(SDKCONFIG_MAKEFILE)
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$(summary) CP $< $@
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cp $< $@
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endif
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COMPONENT_EXTRA_CLEAN += $(SECURE_BOOT_VERIFICATION_KEY)
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COMPONENT_EMBED_FILES := $(SECURE_BOOT_VERIFICATION_KEY)
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endif
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