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storage: flash_map: deprecate legacy Mbed TLS crypto #97605

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Merged
merged 1 commit into from
Oct 20, 2025
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storage: flash_map: deprecate legacy Mbed TLS crypto #97605

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8 changes: 8 additions & 0 deletions doc/releases/migration-guide-4.3.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -302,6 +302,14 @@ Cellular
* :c:enum:`cellular_access_technology` values have been redefined to align with 3GPP TS 27.007.
* :c:enum:`cellular_registration_status` values have been extended to align with 3GPP TS 27.007.

Flash Map
=========

* With the long-term goal of transitioning to PSA Crypto API as the only crypto support in Zephyr,
:kconfig:option:`FLASH_AREA_CHECK_INTEGRITY_MBEDTLS` is deprecated.
:kconfig:option:`FLASH_AREA_CHECK_INTEGRITY_PSA` is now the default choice: if TF-M is not
enabled or not supported by the platform, Mbed TLS will be used as PSA Crypto API provider.

Logging
=======

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7 changes: 4 additions & 3 deletions subsys/storage/flash_map/Kconfig
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Expand Up @@ -46,19 +46,20 @@ if FLASH_AREA_CHECK_INTEGRITY

choice FLASH_AREA_CHECK_INTEGRITY_BACKEND
prompt "Crypto backend for the flash check functions"
default FLASH_AREA_CHECK_INTEGRITY_PSA if BUILD_WITH_TFM
default FLASH_AREA_CHECK_INTEGRITY_MBEDTLS if !BUILD_WITH_TFM
default FLASH_AREA_CHECK_INTEGRITY_PSA

config FLASH_AREA_CHECK_INTEGRITY_PSA
bool "Use PSA"
select PSA_WANT_ALG_SHA_256
select PSA_CRYPTO
help
Use the PSA API to perform the integrity check.

config FLASH_AREA_CHECK_INTEGRITY_MBEDTLS
bool "Use Mbed TLS"
bool "Use Mbed TLS [DEPRECATED]"
select MBEDTLS
select MBEDTLS_SHA256
select DEPRECATED
help
Use the Mbed TLS library to perform the integrity check.

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