Merge branch 'optimize/add_alternative_exponentiation' into 'release/v3.4'

feat: Perform an exponentiation by the algorithm of mbedtls V2 which is faster

See merge request sdk/ESP8266_RTOS_SDK!1715

components/mbedtls/mbedtls_v3/CMakeLists.txt

@@ -196,6 +196,10 @@ target_sources(mbedcrypto PRIVATE "${current_dir}/port/esp_mem.c"
                             "${current_dir}/port/esp_timing.c"
                             "${current_dir}/port/esp_hardware.c")
 
+if(CONFIG_MBEDTLS_MPI_EXP_MOD_ALT)
+    target_sources(mbedcrypto PRIVATE "${current_dir}/port/esp_bignum.c")
+endif()
+
 if(CONFIG_SOC_AES_SUPPORTED)
     target_sources(mbedcrypto PRIVATE "${current_dir}/port/aes/esp_aes_xts.c"
                                   "${current_dir}/port/aes/esp_aes_common.c"

components/mbedtls/mbedtls_v3/Kconfig

@@ -639,6 +639,13 @@ config MBEDTLS_SHA3_C
         Enabling this configuration option increases the flash footprint
         by almost 4KB.
 
+config MBEDTLS_MPI_EXP_MOD_ALT
+    bool "Enable the alternative exponentiation"
+    default y
+    help
+        Perform an exponentiation by the algorithm of mbedtls V2,
+        which is faster when calling "mbedtls_mpi_exp_mod()".
+
 choice MBEDTLS_TLS_MODE
     bool "TLS Protocol Role"
     default MBEDTLS_TLS_SERVER_AND_CLIENT

components/mbedtls/mbedtls_v3/component.mk

@@ -10,7 +10,7 @@ COMPONENT_SRCDIRS := $(CURRENT_DIR)/mbedtls/library $(CURRENT_DIR)/port
 
 COMPONENT_OBJEXCLUDE := $(CURRENT_DIR)/mbedtls/library/net_sockets.o
 
-ifndef CONFIG_MBEDTLS_HARDWARE_MPI
+ifndef CONFIG_MBEDTLS_MPI_EXP_MOD_ALT
 COMPONENT_OBJEXCLUDE += $(CURRENT_DIR)/port/esp_bignum.o
 endif
 

components/mbedtls/mbedtls_v3/port/include/mbedtls/esp_config.h

@@ -206,9 +206,15 @@
 #define MBEDTLS_MPI_MUL_MPI_ALT
 #else
 #undef MBEDTLS_MPI_EXP_MOD_ALT_FALLBACK
-#undef MBEDTLS_MPI_EXP_MOD_ALT
 #undef MBEDTLS_MPI_MUL_MPI_ALT
+#if defined(CONFIG_MBEDTLS_MPI_EXP_MOD_ALT)
+#define MBEDTLS_MPI_EXP_MOD_ALT
+#else
+#undef MBEDTLS_MPI_EXP_MOD_ALT
 #endif
+#endif
+
+#define MBEDTLS_MPI_WINDOW_SIZE             6
 
 #ifdef CONFIG_MBEDTLS_ATCA_HW_ECDSA_SIGN
 #define MBEDTLS_ECDSA_SIGN_ALT