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docs: update app image format description for secure boot v2 signature

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Mahavir Jain
2022-08-23 16:37:58 +05:30
parent e40d733d5a
commit 64a88e995b
1 changed files with 3 additions and 1 deletions
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docs/en/api-reference/system/app_image_format.rst
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@@ -68,11 +68,13 @@ You can also see the information on segments in the ESP-IDF logs while your appl
3. The image has a single checksum byte after the last segment. This byte is written on a sixteen byte padded boundary, so the application image might need padding.
4. If the ``hash_appended`` field from :cpp:type:`esp_image_header_t` is set then a SHA256 checksum will be appended. The value of SHA256 is calculated on the range from the first byte and up to this field. The length of this field is 32 bytes.
5. If the options :ref:`CONFIG_SECURE_SIGNED_APPS_SCHEME` is set to ECDSA then the application image will have additional 68 bytes for an ECDSA signature, which includes:
5. If the option :ref:`CONFIG_SECURE_SIGNED_APPS_SCHEME` is set to ECDSA then the application image will have an additional 68 bytes for an ECDSA signature, which includes:
* version word (4 bytes),
* signature data (64 bytes).
6. If the option :ref:`CONFIG_SECURE_SIGNED_APPS_SCHEME` is set to RSA or ECDSA (V2) then the application image will have an additional signature sector of 4K size. For more details on the format of this signature sector, please refer to :ref:`signature-block-format`.
.. _app_image_format_application_description:
Application Description