Make gmtime() configurable at compile-time
diff --git a/include/mbedtls/platform_util.h b/include/mbedtls/platform_util.h
index 84f0732..5f26fb8 100644
--- a/include/mbedtls/platform_util.h
+++ b/include/mbedtls/platform_util.h
@@ -25,7 +25,18 @@
#ifndef MBEDTLS_PLATFORM_UTIL_H
#define MBEDTLS_PLATFORM_UTIL_H
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#include "mbedtls/platform_time.h"
+
#include <stddef.h>
+#if defined(MBEDTLS_HAVE_TIME_DATE)
+#include <time.h>
+#endif /* MBEDTLS_HAVE_TIME_DATE */
#ifdef __cplusplus
extern "C" {
@@ -55,6 +66,38 @@
*/
void mbedtls_platform_zeroize( void *buf, size_t len );
+#if defined(MBEDTLS_HAVE_TIME_DATE)
+/**
+ * \brief Thread safe implementation of gmtime()
+ *
+ * The function is an abstraction that when called behaves similar
+ * to the gmtime() function from the C standard, but is thread
+ * safe.
+ *
+ * Mbed TLS will try to identify the underlying platform and
+ * configure an appropriate underlying implementation (e.g.
+ * gmtime_r() for POSIX and gmtime_s() for Windows). If this is
+ * not possible, then gmtime() will be used. In this case, calls
+ * from the library to gmtime() will be guarded by the mutex
+ * mbedtls_threading_gmtime_mutex if MBEDTLS_THREADING_C is
+ * enabled. It is recommended that calls from outside the library
+ * are also guarded by this mutex.
+ *
+ * If MBEDTLS_PLATFORM_GMTIME_ALT is defined, then Mbed TLS will
+ * unconditionally use the alternative implementation for
+ * mbedtls_platform_gmtime() supplied by the user at compile time
+ *
+ * \param tt Pointer to an object containing time (in seconds) since the
+ * Epoc to be converted
+ * \param tm Pointer to an object where the results will be stored
+ *
+ * \return Pointer to an object of type struct tm on success, otherwise
+ * NULL
+ */
+struct tm *mbedtls_platform_gmtime( const mbedtls_time_t *tt,
+ struct tm *tm_buf );
+#endif /* MBEDTLS_HAVE_TIME_DATE */
+
#ifdef __cplusplus
}
#endif