Make OPENSSL_tm_to_posix and OPENSSL_posix_to_tm public API
I have a use for these in the chrome verifier conversions, we
could choose to make them hidden again after a future move to
boringssl..
Change-Id: If059debbdf482d64577ad04c1ec4f9c82724de1e
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/55305
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Bob Beck <bbe@google.com>
diff --git a/include/openssl/time.h b/include/openssl/time.h
new file mode 100644
index 0000000..723ce10
--- /dev/null
+++ b/include/openssl/time.h
@@ -0,0 +1,41 @@
+/* Copyright (c) 2022, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+#ifndef OPENSSL_HEADER_TIME_H
+#define OPENSSL_HEADER_TIME_H
+
+#include <openssl/base.h>
+
+#include <time.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+// OPENSSL_posix_to_tm converts a int64_t POSIX time value in |time|, which must
+// be in the range of year 0000 to 9999, to a broken out time value in |tm|. It
+// returns one on success and zero on error.
+OPENSSL_EXPORT int OPENSSL_posix_to_tm(int64_t time, struct tm *out_tm);
+
+// OPENSSL_tm_to_posix converts a time value between the years 0 and 9999 in
+// |tm| to a POSIX time value in |out|. One is returned on success, zero is
+// returned on failure. It is a failure if |tm| contains out of range values.
+OPENSSL_EXPORT int OPENSSL_tm_to_posix(const struct tm *tm, int64_t *out);
+
+
+#if defined(__cplusplus)
+} // extern C
+#endif
+
+#endif // OPENSSL_HEADER_TIME_H
