menu "mbedTLS" choice MBEDTLS_MEM_ALLOC_MODE prompt "Memory allocation strategy" default MBEDTLS_INTERNAL_MEM_ALLOC help Allocation strategy for mbedTLS, essentially provides ability to allocate all required dynamic allocations from, - Internal DRAM memory only - External SPIRAM memory only - Either internal or external memory based on default malloc() behavior in ESP-IDF - Custom allocation mode, by overwriting calloc()/free() using mbedtls_platform_set_calloc_free() function - Internal IRAM memory wherever applicable else internal DRAM Recommended mode here is always internal (*), since that is most preferred from security perspective. But if application requirement does not allow sufficient free internal memory then alternate mode can be selected. (*) In case of ESP32-S2/ESP32-S3, hardware allows encryption of external SPIRAM contents provided hardware flash encryption feature is enabled. In that case, using external SPIRAM allocation strategy is also safe choice from security perspective. config MBEDTLS_INTERNAL_MEM_ALLOC bool "Internal memory" config MBEDTLS_EXTERNAL_MEM_ALLOC bool "External SPIRAM" depends on SPIRAM_USE_CAPS_ALLOC || SPIRAM_USE_MALLOC config MBEDTLS_DEFAULT_MEM_ALLOC bool "Default alloc mode" config MBEDTLS_CUSTOM_MEM_ALLOC bool "Custom alloc mode" config MBEDTLS_IRAM_8BIT_MEM_ALLOC bool "Internal IRAM" depends on ESP32_IRAM_AS_8BIT_ACCESSIBLE_MEMORY help Allows to use IRAM memory region as 8bit accessible region. TLS input and output buffers will be allocated in IRAM section which is 32bit aligned memory. Every unaligned (8bit or 16bit) access will result in an exception and incur penalty of certain clock cycles per unaligned read/write. endchoice #MBEDTLS_MEM_ALLOC_MODE config MBEDTLS_SSL_MAX_CONTENT_LEN int "TLS maximum message content length" default 16384 range 512 16384 depends on !MBEDTLS_ASYMMETRIC_CONTENT_LEN help Maximum TLS message length (in bytes) supported by mbedTLS. 16384 is the default and this value is required to comply fully with TLS standards. However you can set a lower value in order to save RAM. This is safe if the other end of the connection supports Maximum Fragment Length Negotiation Extension (max_fragment_length, see RFC6066) or you know for certain that it will never send a message longer than a certain number of bytes. If the value is set too low, symptoms are a failed TLS handshake or a return value of MBEDTLS_ERR_SSL_INVALID_RECORD (-0x7200). config MBEDTLS_ASYMMETRIC_CONTENT_LEN bool "Asymmetric in/out fragment length" default y help If enabled, this option allows customizing TLS in/out fragment length in asymmetric way. Please note that enabling this with default values saves 12KB of dynamic memory per TLS connection. config MBEDTLS_SSL_IN_CONTENT_LEN int "TLS maximum incoming fragment length" default 16384 range 512 16384 depends on MBEDTLS_ASYMMETRIC_CONTENT_LEN help This defines maximum incoming fragment length, overriding default maximum content length (MBEDTLS_SSL_MAX_CONTENT_LEN). config MBEDTLS_SSL_OUT_CONTENT_LEN int "TLS maximum outgoing fragment length" default 4096 range 512 16384 depends on MBEDTLS_ASYMMETRIC_CONTENT_LEN help This defines maximum outgoing fragment length, overriding default maximum content length (MBEDTLS_SSL_MAX_CONTENT_LEN). config MBEDTLS_DYNAMIC_BUFFER bool "Using dynamic TX/RX buffer" default n select MBEDTLS_ASYMMETRIC_CONTENT_LEN # Dynamic buffer feature is not supported with DTLS depends on !IDF_TARGET_LINUX && !MBEDTLS_SSL_PROTO_DTLS && !MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH help Using dynamic TX/RX buffer. After enabling this option, mbedTLS will allocate TX buffer when need to send data and then free it if all data is sent, allocate RX buffer when need to receive data and then free it when all data is used or read by upper layer. By default, when SSL is initialized, mbedTLS also allocate TX and RX buffer with the default value of "MBEDTLS_SSL_OUT_CONTENT_LEN" or "MBEDTLS_SSL_IN_CONTENT_LEN", so to save more heap, users can set the options to be an appropriate value. config MBEDTLS_DYNAMIC_FREE_CONFIG_DATA bool "Free private key and DHM data after its usage" default n depends on MBEDTLS_DYNAMIC_BUFFER help Free private key and DHM data after its usage in handshake process. The option will decrease heap cost when handshake, but also lead to problem: Because all certificate, private key and DHM data are freed so users should register certificate and private key to ssl config object again. config MBEDTLS_DYNAMIC_FREE_CA_CERT bool "Free SSL CA certificate after its usage" default y depends on MBEDTLS_DYNAMIC_FREE_CONFIG_DATA help Free CA certificate after its usage in the handshake process. This option will decrease the heap footprint for the TLS handshake, but may lead to a problem: If the respective ssl object needs to perform the TLS handshake again, the CA certificate should once again be registered to the ssl object. config MBEDTLS_DEBUG bool "Enable mbedTLS debugging" default n help Enable mbedTLS debugging functions at compile time. If this option is enabled, you can include "mbedtls/esp_debug.h" and call mbedtls_esp_enable_debug_log() at runtime in order to enable mbedTLS debug output via the ESP log mechanism. choice MBEDTLS_DEBUG_LEVEL bool "Set mbedTLS debugging level" depends on MBEDTLS_DEBUG default MBEDTLS_DEBUG_LEVEL_VERBOSE help Set mbedTLS debugging level config MBEDTLS_DEBUG_LEVEL_WARN bool "Warning" config MBEDTLS_DEBUG_LEVEL_INFO bool "Info" config MBEDTLS_DEBUG_LEVEL_DEBUG bool "Debug" config MBEDTLS_DEBUG_LEVEL_VERBOSE bool "Verbose" endchoice config MBEDTLS_DEBUG_LEVEL int default 1 if MBEDTLS_DEBUG_LEVEL_WARN default 2 if MBEDTLS_DEBUG_LEVEL_INFO default 3 if MBEDTLS_DEBUG_LEVEL_DEBUG default 4 if MBEDTLS_DEBUG_LEVEL_VERBOSE menu "mbedTLS v3.x related" # NOTE: MBEDTLS_DYNAMIC_BUFFER feature is not supported with TLS 1.3 yet. Ref: IDF-4762 config MBEDTLS_SSL_PROTO_TLS1_3 bool "Support TLS 1.3 protocol" depends on MBEDTLS_TLS_ENABLED && MBEDTLS_SSL_KEEP_PEER_CERTIFICATE && !MBEDTLS_DYNAMIC_BUFFER select MBEDTLS_HKDF_C default n menu "TLS 1.3 related configurations" depends on MBEDTLS_SSL_PROTO_TLS1_3 config MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE bool "TLS 1.3 middlebox compatibility mode" default y config MBEDTLS_SSL_TLS1_3_KEXM_PSK bool "TLS 1.3 PSK key exchange mode" default y config MBEDTLS_SSL_TLS1_3_KEXM_EPHEMERAL bool "TLS 1.3 ephemeral key exchange mode" default y config MBEDTLS_SSL_TLS1_3_KEXM_PSK_EPHEMERAL bool "TLS 1.3 PSK ephemeral key exchange mode" default y endmenu config MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH bool "Variable SSL buffer length" default n help This enables the SSL buffer to be resized automatically based on the negotiated maximum fragment length in each direction. config MBEDTLS_ECDH_LEGACY_CONTEXT bool "Use a backward compatible ECDH context (Experimental)" default n depends on MBEDTLS_ECDH_C && MBEDTLS_ECP_RESTARTABLE help Use the legacy ECDH context format. Define this option only if you enable MBEDTLS_ECP_RESTARTABLE or if you want to access ECDH context fields directly. config MBEDTLS_X509_TRUSTED_CERT_CALLBACK bool "Enable trusted certificate callbacks" default n help Enables users to configure the set of trusted certificates through a callback instead of a linked list. See mbedTLS documentation for required API and more details. config MBEDTLS_SSL_CONTEXT_SERIALIZATION bool "Enable serialization of the TLS context structures" default n depends on MBEDTLS_GCM_C || MBEDTLS_CCM_C || MBEDTLS_CHACHAPOLY_C help Enable serialization of the TLS context structures This is a local optimization in handling a single, potentially long-lived connection. See mbedTLS documentation for required API and more details. Disabling this option will save some code size. config MBEDTLS_SSL_KEEP_PEER_CERTIFICATE bool "Keep peer certificate after handshake completion" default y help Keep the peer's certificate after completion of the handshake. Disabling this option will save about 4kB of heap and some code size. See mbedTLS documentation for required API and more details. config MBEDTLS_PKCS7_C bool "Enable PKCS #7" default y depends on MBEDTLS_X509_CRL_PARSE_C help Enable PKCS #7 core for using PKCS #7-formatted signatures. config MBEDTLS_SSL_CID_PADDING_GRANULARITY int "Record plaintext padding" default 16 range 0 32 depends on MBEDTLS_SSL_PROTO_TLS1_3 || MBEDTLS_SSL_DTLS_CONNECTION_ID help Controls the use of record plaintext padding in TLS 1.3 and when using the Connection ID extension in DTLS 1.2. The padding will always be chosen so that the length of the padded plaintext is a multiple of the value of this option. Notes: A value of 1 means that no padding will be used for outgoing records. On systems lacking division instructions, a power of two should be preferred. menu "DTLS-based configurations" depends on MBEDTLS_SSL_PROTO_DTLS config MBEDTLS_SSL_DTLS_CONNECTION_ID bool "Support for the DTLS Connection ID extension" default n help Enable support for the DTLS Connection ID extension which allows to identify DTLS connections across changes in the underlying transport. config MBEDTLS_SSL_CID_IN_LEN_MAX int "Maximum length of CIDs used for incoming DTLS messages" default 32 range 0 32 depends on MBEDTLS_SSL_DTLS_CONNECTION_ID help Maximum length of CIDs used for incoming DTLS messages config MBEDTLS_SSL_CID_OUT_LEN_MAX int "Maximum length of CIDs used for outgoing DTLS messages" default 32 range 0 32 depends on MBEDTLS_SSL_DTLS_CONNECTION_ID help Maximum length of CIDs used for outgoing DTLS messages config MBEDTLS_SSL_DTLS_SRTP bool "Enable support for negotiation of DTLS-SRTP (RFC 5764)" default n help Enable support for negotiation of DTLS-SRTP (RFC 5764) through the use_srtp extension. See mbedTLS documentation for required API and more details. Disabling this option will save some code size. endmenu endmenu menu "Certificate Bundle" config MBEDTLS_CERTIFICATE_BUNDLE bool "Enable trusted root certificate bundle" default y help Enable support for large number of default root certificates When enabled this option allows user to store default as well as customer specific root certificates in compressed format rather than storing full certificate. For the root certificates the public key and the subject name will be stored. choice MBEDTLS_DEFAULT_CERTIFICATE_BUNDLE bool "Default certificate bundle options" depends on MBEDTLS_CERTIFICATE_BUNDLE default MBEDTLS_CERTIFICATE_BUNDLE_DEFAULT_FULL config MBEDTLS_CERTIFICATE_BUNDLE_DEFAULT_FULL bool "Use the full default certificate bundle" config MBEDTLS_CERTIFICATE_BUNDLE_DEFAULT_CMN bool "Use only the most common certificates from the default bundles" help Use only the most common certificates from the default bundles, reducing the size with 50%, while still having around 99% coverage. config MBEDTLS_CERTIFICATE_BUNDLE_DEFAULT_NONE bool "Do not use the default certificate bundle" endchoice config MBEDTLS_CUSTOM_CERTIFICATE_BUNDLE depends on MBEDTLS_CERTIFICATE_BUNDLE default n bool "Add custom certificates to the default bundle" config MBEDTLS_CUSTOM_CERTIFICATE_BUNDLE_PATH depends on MBEDTLS_CUSTOM_CERTIFICATE_BUNDLE string "Custom certificate bundle path" help Name of the custom certificate directory or file. This path is evaluated relative to the project root directory. config MBEDTLS_CERTIFICATE_BUNDLE_MAX_CERTS int "Maximum no of certificates allowed in certificate bundle" default 200 depends on MBEDTLS_CERTIFICATE_BUNDLE endmenu config MBEDTLS_ECP_RESTARTABLE bool "Enable mbedTLS ecp restartable" select MBEDTLS_ECDH_LEGACY_CONTEXT depends on MBEDTLS_ECP_C default n help Enable "non-blocking" ECC operations that can return early and be resumed. config MBEDTLS_CMAC_C bool "Enable CMAC mode for block ciphers" default n depends on MBEDTLS_AES_C || MBEDTLS_DES_C help Enable the CMAC (Cipher-based Message Authentication Code) mode for block ciphers. config MBEDTLS_HARDWARE_AES bool "Enable hardware AES acceleration" default y depends on !SPIRAM_CACHE_WORKAROUND_STRATEGY_DUPLDST && SOC_AES_SUPPORTED help Enable hardware accelerated AES encryption & decryption. Note that if the ESP32 CPU is running at 240MHz, hardware AES does not offer any speed boost over software AES. config MBEDTLS_AES_USE_INTERRUPT bool "Use interrupt for long AES operations" depends on !IDF_TARGET_ESP32 && MBEDTLS_HARDWARE_AES default y help Use an interrupt to coordinate long AES operations. This allows other code to run on the CPU while an AES operation is pending. Otherwise the CPU busy-waits. config MBEDTLS_AES_INTERRUPT_LEVEL int "AES hardware interrupt level" default 0 depends on MBEDTLS_AES_USE_INTERRUPT range 0 3 help This config helps to set the interrupt priority level for the AES peripheral. Value 0 (default) means that there is no preference regarding the interrupt priority level and any level from 1 to 3 can be selected (based on the availability). Note: Higher value indicates high interrupt priority. config MBEDTLS_HARDWARE_GCM bool "Enable partially hardware accelerated GCM" depends on SOC_AES_SUPPORT_GCM && MBEDTLS_HARDWARE_AES default y help Enable partially hardware accelerated GCM. GHASH calculation is still done in software. If MBEDTLS_HARDWARE_GCM is disabled and MBEDTLS_HARDWARE_AES is enabled then mbedTLS will still use the hardware accelerated AES block operation, but on a single block at a time. config MBEDTLS_GCM_SUPPORT_NON_AES_CIPHER bool "Enable support for non-AES ciphers in GCM operation" depends on MBEDTLS_HARDWARE_AES default n help Enable this config to support fallback to software definitions for a non-AES cipher GCM operation as we support hardware acceleration only for AES cipher. Some of the non-AES ciphers used in a GCM operation are DES, ARIA, CAMELLIA, CHACHA20, BLOWFISH. If this config is disabled, performing a non-AES cipher GCM operation with the config MBEDTLS_HARDWARE_AES enabled will result in calculation of an AES-GCM operation instead for the given input values and thus could lead to failure in certificate validation which would ultimately lead to a SSL handshake failure. This config being by-default enabled leads to an increase in binary size footprint of ~2.5KB. In case you are sure that your use case (for example, client and server configurations in case of a TLS handshake) would not involve any GCM operations using a non-AES cipher, you can safely disable this config, leading to reduction in binary size footprint. config MBEDTLS_HARDWARE_MPI bool "Enable hardware MPI (bignum) acceleration" default y depends on !SPIRAM_CACHE_WORKAROUND_STRATEGY_DUPLDST && SOC_MPI_SUPPORTED help Enable hardware accelerated multiple precision integer operations. Hardware accelerated multiplication, modulo multiplication, and modular exponentiation for up to SOC_RSA_MAX_BIT_LEN bit results. These operations are used by RSA. config MBEDTLS_LARGE_KEY_SOFTWARE_MPI bool "Fallback to software implementation for larger MPI values" depends on MBEDTLS_HARDWARE_MPI default y if SOC_RSA_MAX_BIT_LEN <= 3072 # HW max 3072 bits default n help Fallback to software implementation for RSA key lengths larger than SOC_RSA_MAX_BIT_LEN. If this is not active then the ESP will be unable to process keys greater than SOC_RSA_MAX_BIT_LEN. config MBEDTLS_MPI_USE_INTERRUPT bool "Use interrupt for MPI exp-mod operations" depends on !IDF_TARGET_ESP32 && MBEDTLS_HARDWARE_MPI default y help Use an interrupt to coordinate long MPI operations. This allows other code to run on the CPU while an MPI operation is pending. Otherwise the CPU busy-waits. config MBEDTLS_MPI_INTERRUPT_LEVEL int "MPI hardware interrupt level" default 0 depends on MBEDTLS_MPI_USE_INTERRUPT range 0 3 help This config helps to set the interrupt priority level for the MPI peripheral. Value 0 (default) means that there is no preference regarding the interrupt priority level and any level from 1 to 3 can be selected (based on the availability). Note: Higher value indicates high interrupt priority. config MBEDTLS_HARDWARE_SHA bool "Enable hardware SHA acceleration" default y depends on !SPIRAM_CACHE_WORKAROUND_STRATEGY_DUPLDST && SOC_SHA_SUPPORTED help Enable hardware accelerated SHA1, SHA256, SHA384 & SHA512 in mbedTLS. Due to a hardware limitation, on the ESP32 hardware acceleration is only guaranteed if SHA digests are calculated one at a time. If more than one SHA digest is calculated at the same time, one will be calculated fully in hardware and the rest will be calculated (at least partially calculated) in software. This happens automatically. SHA hardware acceleration is faster than software in some situations but slower in others. You should benchmark to find the best setting for you. config MBEDTLS_HARDWARE_ECC bool "Enable hardware ECC acceleration" default y depends on SOC_ECC_SUPPORTED help Enable hardware accelerated ECC point multiplication and point verification for points on curve SECP192R1 and SECP256R1 in mbedTLS config MBEDTLS_ECC_OTHER_CURVES_SOFT_FALLBACK bool "Fallback to software implementation for curves not supported in hardware" depends on MBEDTLS_HARDWARE_ECC default y help Fallback to software implementation of ECC point multiplication and point verification for curves not supported in hardware. config MBEDTLS_ROM_MD5 bool "Use MD5 implementation in ROM" default y help Use ROM MD5 in mbedTLS. config MBEDTLS_HARDWARE_ECDSA_SIGN bool "Enable ECDSA signing using on-chip ECDSA peripheral" default n depends on SOC_ECDSA_SUPPORTED help Enable hardware accelerated ECDSA peripheral to sign data on curve SECP192R1 and SECP256R1 in mbedTLS. Note that for signing, the private key has to be burnt in an efuse key block with key purpose set to ECDSA_KEY. If no key is burnt, it will report an error The key should be burnt in little endian format. espefuse.py utility handles it internally but care needs to be taken while burning using esp_efuse APIs config MBEDTLS_HARDWARE_ECDSA_VERIFY bool "Enable ECDSA signature verification using on-chip ECDSA peripheral" default y depends on SOC_ECDSA_SUPPORTED help Enable hardware accelerated ECDSA peripheral to verify signature on curve SECP192R1 and SECP256R1 in mbedTLS. config MBEDTLS_ATCA_HW_ECDSA_SIGN bool "Enable hardware ECDSA sign acceleration when using ATECC608A" default n help This option enables hardware acceleration for ECDSA sign function, only when using ATECC608A cryptoauth chip (integrated with ESP32-WROOM-32SE) config MBEDTLS_ATCA_HW_ECDSA_VERIFY bool "Enable hardware ECDSA verify acceleration when using ATECC608A" default n help This option enables hardware acceleration for ECDSA sign function, only when using ATECC608A cryptoauth chip (integrated with ESP32-WROOM-32SE) config MBEDTLS_HAVE_TIME bool "Enable mbedtls time support" depends on !ESP_TIME_FUNCS_USE_NONE default y help Enable use of time.h functions (time() and gmtime()) by mbedTLS. This option doesn't require the system time to be correct, but enables functionality that requires relative timekeeping - for example periodic expiry of TLS session tickets or session cache entries. Disabling this option will save some firmware size, particularly if the rest of the firmware doesn't call any standard timekeeeping functions. config MBEDTLS_PLATFORM_TIME_ALT bool "Enable mbedtls time support: platform-specific" depends on MBEDTLS_HAVE_TIME default n help Enabling this config will provide users with a function "mbedtls_platform_set_time()" that allows to set an alternative time function pointer. config MBEDTLS_HAVE_TIME_DATE bool "Enable mbedtls certificate expiry check" depends on MBEDTLS_HAVE_TIME default n help Enables X.509 certificate expiry checks in mbedTLS. If this option is disabled (default) then X.509 certificate "valid from" and "valid to" timestamp fields are ignored. If this option is enabled, these fields are compared with the current system date and time. The time is retrieved using the standard time() and gmtime() functions. If the certificate is not valid for the current system time then verification will fail with code MBEDTLS_X509_BADCERT_FUTURE or MBEDTLS_X509_BADCERT_EXPIRED. Enabling this option requires adding functionality in the firmware to set the system clock to a valid timestamp before using TLS. The recommended way to do this is via ESP-IDF's SNTP functionality, but any method can be used. In the case where only a small number of certificates are trusted by the device, please carefully consider the tradeoffs of enabling this option. There may be undesired consequences, for example if all trusted certificates expire while the device is offline and a TLS connection is required to update. Or if an issue with the SNTP server means that the system time is invalid for an extended period after a reset. config MBEDTLS_ECDSA_DETERMINISTIC bool "Enable deterministic ECDSA" default y help Standard ECDSA is "fragile" in the sense that lack of entropy when signing may result in a compromise of the long-term signing key. config MBEDTLS_SHA512_C bool "Enable the SHA-384 and SHA-512 cryptographic hash algorithms" default y help Enable MBEDTLS_SHA512_C adds support for SHA-384 and SHA-512. choice MBEDTLS_TLS_MODE bool "TLS Protocol Role" default MBEDTLS_TLS_SERVER_AND_CLIENT help mbedTLS can be compiled with protocol support for the TLS server, TLS client, or both server and client. Reducing the number of TLS roles supported saves code size. config MBEDTLS_TLS_SERVER_AND_CLIENT bool "Server & Client" select MBEDTLS_TLS_SERVER select MBEDTLS_TLS_CLIENT config MBEDTLS_TLS_SERVER_ONLY bool "Server" select MBEDTLS_TLS_SERVER config MBEDTLS_TLS_CLIENT_ONLY bool "Client" select MBEDTLS_TLS_CLIENT config MBEDTLS_TLS_DISABLED bool "None" endchoice config MBEDTLS_TLS_SERVER bool select MBEDTLS_TLS_ENABLED config MBEDTLS_TLS_CLIENT bool select MBEDTLS_TLS_ENABLED config MBEDTLS_TLS_ENABLED bool menu "TLS Key Exchange Methods" depends on MBEDTLS_TLS_ENABLED config MBEDTLS_PSK_MODES bool "Enable pre-shared-key ciphersuites" default n help Enable to show configuration for different types of pre-shared-key TLS authentatication methods. Leaving this options disabled will save code size if they are not used. config MBEDTLS_KEY_EXCHANGE_PSK bool "Enable PSK based ciphersuite modes" depends on MBEDTLS_PSK_MODES default n help Enable to support symmetric key PSK (pre-shared-key) TLS key exchange modes. config MBEDTLS_KEY_EXCHANGE_DHE_PSK bool "Enable DHE-PSK based ciphersuite modes" depends on MBEDTLS_PSK_MODES && MBEDTLS_DHM_C default y help Enable to support Diffie-Hellman PSK (pre-shared-key) TLS authentication modes. config MBEDTLS_KEY_EXCHANGE_ECDHE_PSK bool "Enable ECDHE-PSK based ciphersuite modes" depends on MBEDTLS_PSK_MODES && MBEDTLS_ECDH_C default y help Enable to support Elliptic-Curve-Diffie-Hellman PSK (pre-shared-key) TLS authentication modes. config MBEDTLS_KEY_EXCHANGE_RSA_PSK bool "Enable RSA-PSK based ciphersuite modes" depends on MBEDTLS_PSK_MODES default y help Enable to support RSA PSK (pre-shared-key) TLS authentication modes. config MBEDTLS_KEY_EXCHANGE_RSA bool "Enable RSA-only based ciphersuite modes" default y help Enable to support ciphersuites with prefix TLS-RSA-WITH- config MBEDTLS_KEY_EXCHANGE_DHE_RSA bool "Enable DHE-RSA based ciphersuite modes" default y depends on MBEDTLS_DHM_C help Enable to support ciphersuites with prefix TLS-DHE-RSA-WITH- config MBEDTLS_KEY_EXCHANGE_ELLIPTIC_CURVE bool "Support Elliptic Curve based ciphersuites" depends on MBEDTLS_ECP_C default y help Enable to show Elliptic Curve based ciphersuite mode options. Disabling all Elliptic Curve ciphersuites saves code size and can give slightly faster TLS handshakes, provided the server supports RSA-only ciphersuite modes. config MBEDTLS_KEY_EXCHANGE_ECDHE_RSA bool "Enable ECDHE-RSA based ciphersuite modes" depends on MBEDTLS_KEY_EXCHANGE_ELLIPTIC_CURVE && MBEDTLS_ECDH_C default y help Enable to support ciphersuites with prefix TLS-ECDHE-RSA-WITH- config MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA bool "Enable ECDHE-ECDSA based ciphersuite modes" depends on MBEDTLS_KEY_EXCHANGE_ELLIPTIC_CURVE && MBEDTLS_ECDH_C && MBEDTLS_ECDSA_C default y help Enable to support ciphersuites with prefix TLS-ECDHE-RSA-WITH- config MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA bool "Enable ECDH-ECDSA based ciphersuite modes" depends on MBEDTLS_KEY_EXCHANGE_ELLIPTIC_CURVE && MBEDTLS_ECDH_C && MBEDTLS_ECDSA_C default y help Enable to support ciphersuites with prefix TLS-ECDHE-RSA-WITH- config MBEDTLS_KEY_EXCHANGE_ECDH_RSA bool "Enable ECDH-RSA based ciphersuite modes" depends on MBEDTLS_KEY_EXCHANGE_ELLIPTIC_CURVE && MBEDTLS_ECDH_C default y help Enable to support ciphersuites with prefix TLS-ECDHE-RSA-WITH- config MBEDTLS_KEY_EXCHANGE_ECJPAKE bool "Enable ECJPAKE based ciphersuite modes" depends on MBEDTLS_ECJPAKE_C && MBEDTLS_ECP_DP_SECP256R1_ENABLED default n help Enable to support ciphersuites with prefix TLS-ECJPAKE-WITH- endmenu # TLS key exchange modes config MBEDTLS_SSL_RENEGOTIATION bool "Support TLS renegotiation" depends on MBEDTLS_TLS_ENABLED default y help The two main uses of renegotiation are (1) refresh keys on long-lived connections and (2) client authentication after the initial handshake. If you don't need renegotiation, disabling it will save code size and reduce the possibility of abuse/vulnerability. config MBEDTLS_SSL_PROTO_TLS1_2 bool "Support TLS 1.2 protocol" depends on MBEDTLS_TLS_ENABLED default y config MBEDTLS_SSL_PROTO_GMTSSL1_1 bool "Support GM/T SSL 1.1 protocol" depends on MBEDTLS_TLS_ENABLED default n help Provisions for GM/T SSL 1.1 support config MBEDTLS_SSL_PROTO_DTLS bool "Support DTLS protocol (all versions)" default n depends on MBEDTLS_SSL_PROTO_TLS1_2 help Requires TLS 1.2 to be enabled for DTLS 1.2 config MBEDTLS_SSL_ALPN bool "Support ALPN (Application Layer Protocol Negotiation)" depends on MBEDTLS_TLS_ENABLED default y help Disabling this option will save some code size if it is not needed. config MBEDTLS_CLIENT_SSL_SESSION_TICKETS bool "TLS: Client Support for RFC 5077 SSL session tickets" default y depends on MBEDTLS_TLS_ENABLED help Client support for RFC 5077 session tickets. See mbedTLS documentation for more details. Disabling this option will save some code size. config MBEDTLS_SERVER_SSL_SESSION_TICKETS bool "TLS: Server Support for RFC 5077 SSL session tickets" default y depends on MBEDTLS_TLS_ENABLED && (MBEDTLS_GCM_C || MBEDTLS_CCM_C || MBEDTLS_CHACHAPOLY_C) help Server support for RFC 5077 session tickets. See mbedTLS documentation for more details. Disabling this option will save some code size. menu "Symmetric Ciphers" config MBEDTLS_AES_C bool "AES block cipher" default y config MBEDTLS_CAMELLIA_C bool "Camellia block cipher" default n config MBEDTLS_DES_C bool "DES block cipher (legacy, insecure)" default n help Enables the DES block cipher to support 3DES-based TLS ciphersuites. 3DES is vulnerable to the Sweet32 attack and should only be enabled if absolutely necessary. config MBEDTLS_BLOWFISH_C bool "Blowfish block cipher (read help)" default n help Enables the Blowfish block cipher (not used for TLS sessions.) The Blowfish cipher is not used for mbedTLS TLS sessions but can be used for other purposes. Read up on the limitations of Blowfish (including Sweet32) before enabling. config MBEDTLS_XTEA_C bool "XTEA block cipher" default n help Enables the XTEA block cipher. config MBEDTLS_CCM_C bool "CCM (Counter with CBC-MAC) block cipher modes" default y depends on MBEDTLS_AES_C || MBEDTLS_CAMELLIA_C help Enable Counter with CBC-MAC (CCM) modes for AES and/or Camellia ciphers. Disabling this option saves some code size. config MBEDTLS_GCM_C bool "GCM (Galois/Counter) block cipher modes" default y depends on MBEDTLS_AES_C || MBEDTLS_CAMELLIA_C help Enable Galois/Counter Mode for AES and/or Camellia ciphers. This option is generally faster than CCM. config MBEDTLS_NIST_KW_C bool "NIST key wrapping (KW) and KW padding (KWP)" default n depends on MBEDTLS_AES_C help Enable NIST key wrapping and key wrapping padding. endmenu # Symmetric Ciphers config MBEDTLS_RIPEMD160_C bool "Enable RIPEMD-160 hash algorithm" default n help Enable the RIPEMD-160 hash algorithm. menu "Certificates" config MBEDTLS_PEM_PARSE_C bool "Read & Parse PEM formatted certificates" default y help Enable decoding/parsing of PEM formatted certificates. If your certificates are all in the simpler DER format, disabling this option will save some code size. config MBEDTLS_PEM_WRITE_C bool "Write PEM formatted certificates" default y help Enable writing of PEM formatted certificates. If writing certificate data only in DER format, disabling this option will save some code size. config MBEDTLS_X509_CRL_PARSE_C bool "X.509 CRL parsing" default y help Support for parsing X.509 Certificate Revocation Lists. config MBEDTLS_X509_CSR_PARSE_C bool "X.509 CSR parsing" default y help Support for parsing X.509 Certificate Signing Requests endmenu # Certificates menuconfig MBEDTLS_ECP_C bool "Elliptic Curve Ciphers" default y config MBEDTLS_DHM_C bool "Diffie-Hellman-Merkle key exchange (DHM)" default n help Enable DHM. Needed to use DHE-xxx TLS ciphersuites. Note that the security of Diffie-Hellman key exchanges depends on a suitable prime being used for the exchange. Please see detailed warning text about this in file `mbedtls/dhm.h` file. config MBEDTLS_ECDH_C bool "Elliptic Curve Diffie-Hellman (ECDH)" depends on MBEDTLS_ECP_C default y help Enable ECDH. Needed to use ECDHE-xxx TLS ciphersuites. config MBEDTLS_ECDSA_C bool "Elliptic Curve DSA" depends on MBEDTLS_ECDH_C default y help Enable ECDSA. Needed to use ECDSA-xxx TLS ciphersuites. config MBEDTLS_ECJPAKE_C bool "Elliptic curve J-PAKE" depends on MBEDTLS_ECP_C default n help Enable ECJPAKE. Needed to use ECJPAKE-xxx TLS ciphersuites. config MBEDTLS_ECP_DP_SECP192R1_ENABLED bool "Enable SECP192R1 curve" depends on MBEDTLS_ECP_C default y if !(MBEDTLS_ATCA_HW_ECDSA_SIGN || MBEDTLS_ATCA_HW_ECDSA_VERIFY) help Enable support for SECP192R1 Elliptic Curve. config MBEDTLS_ECP_DP_SECP224R1_ENABLED bool "Enable SECP224R1 curve" depends on MBEDTLS_ECP_C default y if !(MBEDTLS_ATCA_HW_ECDSA_SIGN || MBEDTLS_ATCA_HW_ECDSA_VERIFY) help Enable support for SECP224R1 Elliptic Curve. config MBEDTLS_ECP_DP_SECP256R1_ENABLED bool "Enable SECP256R1 curve" depends on MBEDTLS_ECP_C default y help Enable support for SECP256R1 Elliptic Curve. config MBEDTLS_ECP_DP_SECP384R1_ENABLED bool "Enable SECP384R1 curve" depends on MBEDTLS_ECP_C default y if !(MBEDTLS_ATCA_HW_ECDSA_SIGN || MBEDTLS_ATCA_HW_ECDSA_VERIFY) help Enable support for SECP384R1 Elliptic Curve. config MBEDTLS_ECP_DP_SECP521R1_ENABLED bool "Enable SECP521R1 curve" depends on MBEDTLS_ECP_C default y if !(MBEDTLS_ATCA_HW_ECDSA_SIGN || MBEDTLS_ATCA_HW_ECDSA_VERIFY) help Enable support for SECP521R1 Elliptic Curve. config MBEDTLS_ECP_DP_SECP192K1_ENABLED bool "Enable SECP192K1 curve" depends on MBEDTLS_ECP_C default y if !(MBEDTLS_ATCA_HW_ECDSA_SIGN || MBEDTLS_ATCA_HW_ECDSA_VERIFY) help Enable support for SECP192K1 Elliptic Curve. config MBEDTLS_ECP_DP_SECP224K1_ENABLED bool "Enable SECP224K1 curve" depends on MBEDTLS_ECP_C default y if !(MBEDTLS_ATCA_HW_ECDSA_SIGN || MBEDTLS_ATCA_HW_ECDSA_VERIFY) help Enable support for SECP224K1 Elliptic Curve. config MBEDTLS_ECP_DP_SECP256K1_ENABLED bool "Enable SECP256K1 curve" depends on MBEDTLS_ECP_C default y if !(MBEDTLS_ATCA_HW_ECDSA_SIGN || MBEDTLS_ATCA_HW_ECDSA_VERIFY) help Enable support for SECP256K1 Elliptic Curve. config MBEDTLS_ECP_DP_BP256R1_ENABLED bool "Enable BP256R1 curve" depends on MBEDTLS_ECP_C default y if !(MBEDTLS_ATCA_HW_ECDSA_SIGN || MBEDTLS_ATCA_HW_ECDSA_VERIFY) help support for DP Elliptic Curve. config MBEDTLS_ECP_DP_BP384R1_ENABLED bool "Enable BP384R1 curve" depends on MBEDTLS_ECP_C default y if !(MBEDTLS_ATCA_HW_ECDSA_SIGN || MBEDTLS_ATCA_HW_ECDSA_VERIFY) help support for DP Elliptic Curve. config MBEDTLS_ECP_DP_BP512R1_ENABLED bool "Enable BP512R1 curve" depends on MBEDTLS_ECP_C default y if !(MBEDTLS_ATCA_HW_ECDSA_SIGN || MBEDTLS_ATCA_HW_ECDSA_VERIFY) help support for DP Elliptic Curve. config MBEDTLS_ECP_DP_CURVE25519_ENABLED bool "Enable CURVE25519 curve" depends on MBEDTLS_ECP_C default y if !(MBEDTLS_ATCA_HW_ECDSA_SIGN || MBEDTLS_ATCA_HW_ECDSA_VERIFY) help Enable support for CURVE25519 Elliptic Curve. config MBEDTLS_ECP_NIST_OPTIM bool "NIST 'modulo p' optimisations" depends on MBEDTLS_ECP_C default y help NIST 'modulo p' optimisations increase Elliptic Curve operation performance. Disabling this option saves some code size. config MBEDTLS_ECP_FIXED_POINT_OPTIM bool "Enable fixed-point multiplication optimisations" depends on MBEDTLS_ECP_C default y help This configuration option enables optimizations to speedup (about 3 ~ 4 times) the ECP fixed point multiplication using pre-computed tables in the flash memory. Disabling this configuration option saves flash footprint (about 29KB if all Elliptic Curve selected) in the application binary. # end of Elliptic Curve options config MBEDTLS_POLY1305_C bool "Poly1305 MAC algorithm" default n help Enable support for Poly1305 MAC algorithm. config MBEDTLS_CHACHA20_C bool "Chacha20 stream cipher" default n help Enable support for Chacha20 stream cipher. config MBEDTLS_CHACHAPOLY_C bool "ChaCha20-Poly1305 AEAD algorithm" default n depends on MBEDTLS_CHACHA20_C && MBEDTLS_POLY1305_C help Enable support for ChaCha20-Poly1305 AEAD algorithm. config MBEDTLS_HKDF_C bool "HKDF algorithm (RFC 5869)" default n help Enable support for the Hashed Message Authentication Code (HMAC)-based key derivation function (HKDF). config MBEDTLS_THREADING_C bool "Enable the threading abstraction layer" default n help If you do intend to use contexts between threads, you will need to enable this layer to prevent race conditions. config MBEDTLS_THREADING_ALT bool "Enable threading alternate implementation" depends on MBEDTLS_THREADING_C default y help Enable threading alt to allow your own alternate threading implementation. config MBEDTLS_THREADING_PTHREAD bool "Enable threading pthread implementation" depends on MBEDTLS_THREADING_C default n help Enable the pthread wrapper layer for the threading layer. config MBEDTLS_ERROR_STRINGS bool "Enable error code to error string conversion" default y help Enables mbedtls_strerror() for converting error codes to error strings. Disabling this config can save some code/rodata size as the error string conversion implementation is replaced with an empty stub. config MBEDTLS_USE_CRYPTO_ROM_IMPL bool "Use ROM implementation of the crypto algorithm" depends on ESP_ROM_HAS_MBEDTLS_CRYPTO_LIB && IDF_EXPERIMENTAL_FEATURES default "n" select MBEDTLS_SHA512_C select MBEDTLS_AES_C select MBEDTLS_CCM_C select MBEDTLS_ROM_MD5 select MBEDTLS_HARDWARE_SHA help Enable this flag to use mbedtls crypto algorithm from ROM instead of ESP-IDF. This configuration option saves flash footprint in the application binary. Note that the version of mbedtls crypto algorithm library in ROM is v2.16.12. We have done the security analysis of the mbedtls revision in ROM (v2.16.12) and ensured that affected symbols have been patched (removed). If in the future mbedtls revisions there are security issues that also affects the version in ROM (v2.16.12) then we shall patch the relevant symbols. This would increase the flash footprint and hence care must be taken to keep some reserved space for the application binary in flash layout. endmenu # mbedTLS