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- The KW unwrap path (bootloader / bootutil_aes_kw_unwrap) uses mbedtls and assumes allocators are already initialized. - Internal sim images call the KW wrap helper (kw_encrypt_) before the bootloader runs. - That helper calls mbedtls_platform_set_calloc_free(calloc, free), so the allocator is initialized. Skipping the wrap step makes bootutil_aes_kw_unwrap fail.
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Skipping the wrap step makes bootutil_aes_kw_unwrap fail.