Merge branch 'feature/support_mbedtls_ecp_fixed_point_configurable_v5.0' into 'release/v5.0'

feat(mbedtls): support ecp fixed-point multiplication configurable (backport v5.0)

See merge request espressif/esp-idf!25287

components/mbedtls/Kconfig

@@ -959,6 +959,16 @@ menu "mbedTLS"
 
             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

components/mbedtls/port/include/mbedtls/esp_config.h

@@ -487,6 +487,19 @@
 #undef MBEDTLS_ECP_NIST_OPTIM
 #endif
 
+/**
+ * \def MBEDTLS_ECP_FIXED_POINT_OPTIM
+ *
+ * Enable speed up fixed-point multiplication.
+ *
+ * Comment this macro to disable FIXED POINT curves optimisation.
+ */
+#ifdef CONFIG_MBEDTLS_ECP_FIXED_POINT_OPTIM
+#define MBEDTLS_ECP_FIXED_POINT_OPTIM 1
+#else
+#define MBEDTLS_ECP_FIXED_POINT_OPTIM 0
+#endif
+
 /**
  * \def MBEDTLS_ECDSA_DETERMINISTIC
  *

docs/en/api-guides/performance/size.rst

@@ -391,6 +391,8 @@ These include:
 - :ref:`CONFIG_MBEDTLS_CCM_C`
 - :ref:`CONFIG_MBEDTLS_GCM_C`
 - :ref:`CONFIG_MBEDTLS_ECP_C` (Alternatively: Leave this option enabled but disable some of the elliptic curves listed in the sub-menu.)
+- :ref:`CONFIG_MBEDTLS_ECP_NIST_OPTIM`
+- :ref:`CONFIG_MBEDTLS_ECP_FIXED_POINT_OPTIM`
 - Change :ref:`CONFIG_MBEDTLS_TLS_MODE` if both server & client functionalities are not needed
 - Consider disabling some ciphersuites listed in the "TLS Key Exchange Methods" sub-menu (i.e. :ref:`CONFIG_MBEDTLS_KEY_EXCHANGE_RSA`)