samd/mbedtls: Add time and date functions for mbedtls.

robert-hh · robert-hh · commit ca5eac2c5ef9 · 2023-12-06T08:46:26.000+01:00
Signed-off-by: robert-hh &lt;robert@hammelrath.com&gt;
diff --git a/ports/samd/mbedtls/mbedtls_config.h b/ports/samd/mbedtls/mbedtls_config.h
@@ -26,6 +26,10 @@
 #ifndef MICROPY_INCLUDED_MBEDTLS_CONFIG_H
 #define MICROPY_INCLUDED_MBEDTLS_CONFIG_H
 
+// Time hook.
+#include <time.h>
+extern time_t samd_rtctime_seconds(time_t *timer);
+#define MBEDTLS_PLATFORM_TIME_MACRO samd_rtctime_seconds
 // Set MicroPython-specific options.
 #define MICROPY_MBEDTLS_CONFIG_BARE_METAL (1)
 
diff --git a/ports/samd/mbedtls/mbedtls_port.c b/ports/samd/mbedtls/mbedtls_port.c
@@ -28,7 +28,13 @@
 
 #include "mbedtls_config.h"
 #include <stdint.h>
-uint32_t trng_random_u32();
+uint32_t trng_random_u32(void);
+#if defined(MBEDTLS_HAVE_TIME) || defined(MBEDTLS_HAVE_TIME_DATE)
+#include <stdbool.h>
+#include "py/runtime.h"
+#include "shared/timeutils/timeutils.h"
+extern void rtc_gettime(timeutils_struct_time_t *tm);
+#endif
 
 int mbedtls_hardware_poll(void *data, unsigned char *output, size_t len, size_t *olen) {
 
@@ -40,3 +46,31 @@ int mbedtls_hardware_poll(void *data, unsigned char *output, size_t len, size_t
 }
 
 #endif
+
+#if defined(MBEDTLS_HAVE_TIME)
+time_t samd_rtctime_seconds(time_t *timer) {
+    timeutils_struct_time_t tm;
+    rtc_gettime(&tm);
+    return timeutils_seconds_since_epoch(tm.tm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec);
+}
+#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
