fix(cmake/signing): do not clean up the CONFIG_SECURE_BOOT_VERIFICATI… (IDFGH-13799)

[Andste82]

…ON_KEY file provided separately

Description

with secure boot V1 remote signing, the private key is not part of the project, as the binaries are signed in a separate process. however, the derived verification key must be available at compile time.

if “Sign binaries during build” is deactivated according to the documentation and the generated verification key file is defined via CONFIG_SECURE_BOOT_VERIFICATION_KEY, then this verification key is currently deleted in a project clean!

this patch no longer deletes the file specified by the user.

Related

https://docs.espressif.com/projects/esp-idf/en/stable/esp32/security/secure-boot-v1.html#remote-signing-of-images

Testing

sdkconfig:

#
# Security features
#
CONFIG_SECURE_SIGNED_ON_UPDATE=y
CONFIG_SECURE_SIGNED_APPS=y
CONFIG_SECURE_BOOT_V2_RSA_SUPPORTED=y
CONFIG_SECURE_BOOT_V1_SUPPORTED=y
CONFIG_SECURE_BOOT_V2_PREFERRED=y
CONFIG_SECURE_SIGNED_APPS_NO_SECURE_BOOT=y
CONFIG_SECURE_SIGNED_APPS_ECDSA_SCHEME=y
# CONFIG_SECURE_SIGNED_APPS_RSA_SCHEME is not set
# CONFIG_SECURE_SIGNED_ON_BOOT_NO_SECURE_BOOT is not set
CONFIG_SECURE_SIGNED_ON_UPDATE_NO_SECURE_BOOT=y
# CONFIG_SECURE_BOOT is not set
# CONFIG_SECURE_BOOT_BUILD_SIGNED_BINARIES is not set
CONFIG_SECURE_BOOT_VERIFICATION_KEY="signature_verification_key.bin"
# CONFIG_SECURE_FLASH_ENC_ENABLED is not set

[github-actions]

Warnings

⚠️

Some issues found for the commit messages in this PR: the commit message "fix(cmake/signing): do not clean up the CONFIG_SECURE_BOOT_VERIFICATION_KEY file provided separately": summary appears to be too long Please fix these commit messages - here are some basic tips: follow Conventional Commits style correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test sufficiently descriptive message summary should be between 20 to 72 characters and start with upper case letter avoid Jira references in commit messages (unavailable/irrelevant for our customers) TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).

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