mimxrt/mbedtls: Enable certificate validity time validation.

Signed-off-by: iabdalkader <i.abdalkader@gmail.com>

ports/mimxrt/mbedtls/mbedtls_config.h

@@ -26,6 +26,15 @@
 #ifndef MICROPY_INCLUDED_MBEDTLS_CONFIG_H
 #define MICROPY_INCLUDED_MBEDTLS_CONFIG_H
 
+// Enable mbedtls modules.
+#define MBEDTLS_HAVE_TIME
+#define MBEDTLS_HAVE_TIME_DATE
+
+// Time hook.
+#include <time.h>
+extern time_t mimxrt_rtctime_seconds(time_t *timer);
+#define MBEDTLS_PLATFORM_TIME_MACRO mimxrt_rtctime_seconds
+
 // Set MicroPython-specific options.
 #define MICROPY_MBEDTLS_CONFIG_BARE_METAL (1)
 

ports/mimxrt/mbedtls/mbedtls_port.c

@@ -24,9 +24,16 @@
  * THE SOFTWARE.
  */
 
+#include "py/runtime.h"
+
 #ifdef MICROPY_SSL_MBEDTLS
 
 #include "mbedtls_config.h"
+#if defined(MBEDTLS_HAVE_TIME) || defined(MBEDTLS_HAVE_TIME_DATE)
+#include "fsl_snvs_lp.h"
+#include "shared/timeutils/timeutils.h"
+#endif
+
 void trng_random_data(unsigned char *output, size_t len);
 
 int mbedtls_hardware_poll(void *data, unsigned char *output, size_t len, size_t *olen) {
@@ -38,4 +45,33 @@ int mbedtls_hardware_poll(void *data, unsigned char *output, size_t len, size_t
     return 0;
 }
 
+#if defined(MBEDTLS_HAVE_TIME)
+time_t mimxrt_rtctime_seconds(time_t *timer) {
+    // Get date and date in CPython order.
+    snvs_lp_srtc_datetime_t date;
+    SNVS_LP_SRTC_GetDatetime(SNVS, &date);
+    return timeutils_seconds_since_epoch(date.year, date.month, date.day, date.hour, date.minute, date.second);
+}
+#endif
+
+#if defined(MBEDTLS_HAVE_TIME_DATE)
+struct tm *gmtime(const time_t *timep) {
+    static struct tm tm;
+    timeutils_struct_time_t tm_buf = {0};
+    timeutils_seconds_since_epoch_to_struct_time(*timep, &tm_buf);
+
+    tm.tm_sec = tm_buf.tm_sec;
+    tm.tm_min = tm_buf.tm_min;
+    tm.tm_hour = tm_buf.tm_hour;
+    tm.tm_mday = tm_buf.tm_mday;
+    tm.tm_mon = tm_buf.tm_mon - 1;
+    tm.tm_year = tm_buf.tm_year - 1900;
+    tm.tm_wday = tm_buf.tm_wday;
+    tm.tm_yday = tm_buf.tm_yday;
+    tm.tm_isdst = -1;
+
+    return &tm;
+}
+#endif
+
 #endif