Espressif ESP32-S2 Programming Manual page 1195

Chapter 2. API Reference
• CONFIG_MBEDTLS_HARDWARE_AES
• CONFIG_MBEDTLS_ATCA_HW_ECDSA_SIGN
• CONFIG_MBEDTLS_ATCA_HW_ECDSA_VERIFY
• CONFIG_MBEDTLS_HARDWARE_MPI
• CONFIG_MBEDTLS_HARDWARE_SHA
• CONFIG_MBEDTLS_DEBUG
• CONFIG_MBEDTLS_ECP_RESTARTABLE
• CONFIG_MBEDTLS_HAVE_TIME
• CONFIG_MBEDTLS_RIPEMD160_C
• CONFIG_MBEDTLS_SHA512_C
• CONFIG_MBEDTLS_THREADING_C
• CONFIG_MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE
• CONFIG_MBEDTLS_X509_CHECK_KEY_USAGE
• CONFIG_MBEDTLS_LARGE_KEY_SOFTWARE_MPI
• CONFIG_MBEDTLS_HKDF_C
• CONFIG_MBEDTLS_SSL_PROTO_SSL3
• CONFIG_MBEDTLS_MEM_ALLOC_MODE
• CONFIG_MBEDTLS_POLY1305_C
• CONFIG_MBEDTLS_SECURITY_RISKS
• CONFIG_MBEDTLS_SSL_ALPN
• CONFIG_MBEDTLS_SSL_PROTO_DTLS
• CONFIG_MBEDTLS_SSL_PROTO_GMTSSL1_1
• CONFIG_MBEDTLS_SSL_PROTO_TLS1
• CONFIG_MBEDTLS_SSL_PROTO_TLS1_1
• CONFIG_MBEDTLS_SSL_PROTO_TLS1_2
• CONFIG_MBEDTLS_SSL_RENEGOTIATION
• Symmetric Ciphers
• TLS Key Exchange Methods
• CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN
• CONFIG_MBEDTLS_TLS_MODE
• CONFIG_MBEDTLS_CLIENT_SSL_SESSION_TICKETS
• CONFIG_MBEDTLS_SERVER_SSL_SESSION_TICKETS
• CONFIG_MBEDTLS_ROM_MD5
• CONFIG_MBEDTLS_DYNAMIC_BUFFER
CONFIG_MBEDTLS_MEM_ALLOC_MODE
Memory allocation strategy
Found in: Component config
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.
Available options:
• Internal memory (MBEDTLS_INTERNAL_MEM_ALLOC)
Espressif Systems
> mbedTLS
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