rp2/mbedtls: Enable certificate validity time validation.

ports/rp2/mbedtls/mbedtls_config.h

@@ -93,6 +93,8 @@
 #define MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_KEY_EXCHANGE
 #define MBEDTLS_X509_CRT_PARSE_C
 #define MBEDTLS_X509_USE_C
+#define MBEDTLS_HAVE_TIME
+#define MBEDTLS_HAVE_TIME_DATE
 
 // Memory allocation hooks
 #include <stdlib.h>
@@ -103,6 +105,10 @@ void m_tracked_free(void *ptr);
 #define MBEDTLS_PLATFORM_STD_FREE m_tracked_free
 #define MBEDTLS_PLATFORM_SNPRINTF_MACRO snprintf
 
+// Time hook
+time_t rp2_rtctime_seconds(time_t *timer);
+#define MBEDTLS_PLATFORM_TIME_MACRO rp2_rtctime_seconds
+
 #include "mbedtls/check_config.h"
 
 #endif /* MICROPY_INCLUDED_MBEDTLS_CONFIG_H */

ports/rp2/mbedtls/mbedtls_port.c

@@ -29,6 +29,9 @@
 
 #include "mbedtls_config.h"
 
+#include "hardware/rtc.h"
+#include "shared/timeutils/timeutils.h"
+
 extern uint8_t rosc_random_u8(size_t cycles);
 
 int mbedtls_hardware_poll(void *data, unsigned char *output, size_t len, size_t *olen) {
@@ -39,4 +42,10 @@ int mbedtls_hardware_poll(void *data, unsigned char *output, size_t len, size_t
     return 0;
 }
 
+time_t rp2_rtctime_seconds(time_t *timer) {
+    datetime_t t;
+    rtc_get_datetime(&t);
+    return timeutils_seconds_since_epoch(t.year, t.month, t.day, t.hour, t.min, t.sec);
+}
+
 #endif