- Do not include MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH to full config as it requires also MBEDTLS_CTR_DRBG_USE_128_BIT_KEY - Update check_config to check availability of flags: MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH MBEDTLS_CTR_DRBG_USE_128_BIT_KEY