modules: mbedtls: Add a mbedtls_ms_time implementation

MbedTLS 3.5.0 requires a implementation of mbedtls_ms_time giving a
time in ms for TLS 1.3
Therefor adding an alternative implementation using zephyrs
k_uptime_get

Signed-off-by: Markus Swarowsky <markus.swarowsky@nordicsemi.no>

modules/mbedtls/CMakeLists.txt

@@ -180,6 +180,7 @@ zephyr_interface_library_named(mbedTLS)
       ${ZEPHYR_CURRENT_MODULE_DIR}/library/ssl_tls13_keys.c
       ${ZEPHYR_CURRENT_MODULE_DIR}/library/ssl_tls13_server.c
       ${ZEPHYR_CURRENT_MODULE_DIR}/library/ssl_tls.c
+      zephyr_time.c
     )
 
     zephyr_library_sources(${mbedtls_source})

modules/mbedtls/configs/config-tls-generic.h

@@ -37,6 +37,7 @@
 #if defined(CONFIG_MBEDTLS_HAVE_TIME_DATE)
 #define MBEDTLS_HAVE_TIME
 #define MBEDTLS_HAVE_TIME_DATE
+#define MBEDTLS_PLATFORM_MS_TIME_ALT
 #endif
 
 #if defined(CONFIG_MBEDTLS_TEST)

modules/mbedtls/zephyr_time.c

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2023 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <mbedtls/platform_time.h>
+#include <zephyr/kernel.h>
+
+mbedtls_ms_time_t mbedtls_ms_time(void)
+{
+	return (mbedtls_ms_time_t)k_uptime_get();
+}