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fix(security): Fixed the host-based security workflows

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Aditya Patwardhan 2023-08-04 10:01:18 +05:30
parent 7f85830a3b
commit 388a61c7b7
1 changed files with 4 additions and 2 deletions
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6
docs/en/security/host-based-security-workflows.rst
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@ -52,7 +52,9 @@ When enabling the Flash Encryption and Secure Boot V2 externally we need to enab
#. Enable Flash Encryption feature by following the steps listed in :ref:`enable-flash-encryption-externally`.
#. Enable Secure Boot V2 feature by following the steps listed in :ref:`enable-secure-boot-v2-externally`.
The reason for this order is that when Secure Boot V2 is enabled, we write protect the eFuse ``WR_DIS``. Once that eFuse is write protected, we can no longer enable Flash Encryption.
The reason for this order is as follows:
To enable the Secure Boot (SB) V2, it is necessary to keep the SB V2 key readable. To protect the key's readability, the write-protection for RD_DIS (ESP_EFUSE_WR_DIS_RD_DIS) is applied. However, this action poses a challenge when attempting to enable Flash Encryption, as the Flash Encryption (FE) key needs to remain unreadable. This conflict arises because the RD_DIS is already write-protected, making it impossible to read protect the FE key.
.. _enable-flash-encryption-externally:
@ -133,7 +135,7 @@ In this case all the eFuses related to flash encryption are written with help of
espefuse.py --port PORT burn_key BLOCK my_flash_encryption_key.bin KEYPURPOSE
where ``BLOCK`` is a free keyblock between ``BLOCK_KEY0`` and ``BLOCK_KEY5``. And ``KEYPURPOSE`` is either ``AES_256_KEY_1``, ``XTS_AES_256_KEY_2``, ``XTS_AES_128_KEY``. See `{IDF_TARGET_NAME} Technical Reference Manual <{IDF_TARGET_TRM_EN_URL}>`_ for a description of the key purposes.
where ``BLOCK`` is a free keyblock between ``BLOCK_KEY0`` and ``BLOCK_KEY5``. And ``KEYPURPOSE`` is either ``XTS_AES_256_KEY_1``, ``XTS_AES_256_KEY_2``, ``XTS_AES_128_KEY``. See `{IDF_TARGET_NAME} Technical Reference Manual <{IDF_TARGET_TRM_EN_URL}>`_ for a description of the key purposes.
For AES-128 (256-bit key) - ``XTS_AES_128_KEY``: