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esp-idf/components/mbedtls/Kconfig
Laukik Hase df9f101792 mbedtls: Added option MBEDTLS_SSL_KEEP_PEER_CERTIFICATE 
- Removed code regarding MBEDTLS_DYNAMIC_FREE_PEER_CERT
  (config was kept for backward compatibility)
- Combined mbedTLS v2.28.x related options under a separate Kconfig menu
2022-02-02 11:00:32 +05:30

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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 !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_PEER_CERT
bool "Free SSL peer certificate after its usage"
default n
depends on MBEDTLS_DYNAMIC_BUFFER
help
Free peer certificate after its usage in handshake process.
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:
Becasue 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 v2.28.x related"
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 y
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
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
depends on !MBEDTLS_DYNAMIC_FREE_PEER_CERT
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.
menu "DTLS-based configurations"
visible if MBEDTLS_SSL_PROTO_DTLS
config MBEDTLS_SSL_DTLS_CONNECTION_ID
bool "Support for the DTLS Connection ID extension"
depends on MBEDTLS_SSL_PROTO_DTLS
default n
help
Enable support for the DTLS Connection ID extension which allows to
identify DTLS connections across changes in the underlying transport.
The Connection ID extension is still in draft state.
Refer: version draft-ietf-tls-dtls-connection-id-05
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_CID_PADDING_GRANULARITY
int "Record plaintext padding (for DTLS 1.2)"
default 16
range 0 32
depends on MBEDTLS_SSL_DTLS_CONNECTION_ID
help
Controls the use of record plaintext padding 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.
config MBEDTLS_SSL_DTLS_SRTP
bool "Enable support for negotiation of DTLS-SRTP (RFC 5764)"
depends on MBEDTLS_SSL_PROTO_DTLS
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.
endmenu
config MBEDTLS_ECP_RESTARTABLE
bool "Enable mbedTLS ecp restartable"
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
help
Enable the CMAC (Cipher-based Message Authentication Code) mode for
block ciphers.
config MBEDTLS_HARDWARE_AES
bool "Enable hardware AES acceleration"
default n if IDF_TARGET_ESP32S3
default y
depends on !SPIRAM_CACHE_WORKAROUND_STRATEGY_DUPLDST
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_ESP32S2 && 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_HARDWARE_GCM
bool "Enable partially hardware accelerated GCM"
depends on IDF_TARGET_ESP32S2 && 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_HARDWARE_MPI
bool "Enable hardware MPI (bignum) acceleration"
default n if IDF_TARGET_ESP32S3
default y
depends on !SPIRAM_CACHE_WORKAROUND_STRATEGY_DUPLDST
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_HARDWARE_SHA
bool "Enable hardware SHA acceleration"
default n if IDF_TARGET_ESP32S3
default y
depends on !SPIRAM_CACHE_WORKAROUND_STRATEGY_DUPLDST
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_ROM_MD5
bool "Use MD5 implementation in ROM"
default y
help
Use ROM MD5 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_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
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
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_SSL3
bool "Legacy SSL 3.0 support"
depends on MBEDTLS_TLS_ENABLED
default n
help
Support the legacy SSL 3.0 protocol. Most servers will speak a newer
TLS protocol these days.
config MBEDTLS_SSL_PROTO_TLS1
bool "Support TLS 1.0 protocol"
depends on MBEDTLS_TLS_ENABLED
default y
config MBEDTLS_SSL_PROTO_TLS1_1
bool "Support TLS 1.1 protocol"
depends on MBEDTLS_TLS_ENABLED
default y
config MBEDTLS_SSL_PROTO_TLS1_2
bool "Support TLS 1.2 protocol"
depends on MBEDTLS_TLS_ENABLED
default y
config MBEDTLS_SSL_PROTO_DTLS
bool "Support DTLS protocol (all versions)"
default n
depends on MBEDTLS_SSL_PROTO_TLS1_1 || MBEDTLS_SSL_PROTO_TLS1_2
help
Requires TLS 1.1 to be enabled for DTLS 1.0
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_X509_CHECK_KEY_USAGE
bool "Enable verification of the keyUsage extension"
default y
depends on MBEDTLS_TLS_ENABLED
help
Disabling this avoids problems with mis-issued and/or misused (intermediate) CA and leaf certificates.
Depending on your PKI use, disabling this can be a security risk.
config MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE
bool "Enable verification of the extendedKeyUsage extension"
default y
depends on MBEDTLS_TLS_ENABLED
help
Disabling this avoids problems with mis-issued and/or misused certificates.
Depending on your PKI use, disabling this can be a security risk.
config MBEDTLS_SERVER_SSL_SESSION_TICKETS
bool "TLS: Server Support for RFC 5077 SSL session tickets"
default y
depends on MBEDTLS_TLS_ENABLED
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.
choice MBEDTLS_RC4_MODE
prompt "RC4 Stream Cipher (legacy, insecure)"
default MBEDTLS_RC4_DISABLED
help
ARCFOUR (RC4) stream cipher can be disabled entirely, enabled but not
added to default ciphersuites, or enabled completely.
Please consider the security implications before enabling RC4.
config MBEDTLS_RC4_DISABLED
bool "Disabled"
config MBEDTLS_RC4_ENABLED_NO_DEFAULT
bool "Enabled, not in default ciphersuites"
config MBEDTLS_RC4_ENABLED
bool "Enabled"
endchoice
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 Certifificate Revocation Lists.
config MBEDTLS_X509_CSR_PARSE_C
bool "X.509 CSR parsing"
default y
help
Support for parsing X.509 Certifificate Signing Requests
endmenu # Certificates
menuconfig MBEDTLS_ECP_C
bool "Elliptic Curve Ciphers"
default y
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.
# 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_LARGE_KEY_SOFTWARE_MPI
bool "Fallback to software implementation for larger MPI values"
depends on MBEDTLS_HARDWARE_MPI
default y if IDF_TARGET_ESP32C3 # 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.
menuconfig MBEDTLS_SECURITY_RISKS
bool "Show configurations with potential security risks"
default n
config MBEDTLS_ALLOW_UNSUPPORTED_CRITICAL_EXT
bool "X.509 CRT parsing with unsupported critical extensions"
depends on MBEDTLS_SECURITY_RISKS
default n
help
Allow the X.509 certificate parser to load certificates
with unsupported critical extensions
endmenu # mbedTLS
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