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>

crypto/asn1/a_time.c

diff --git a/crypto/asn1/a_time.c b/crypto/asn1/a_time.c
index 5082969..39b54a6 100644
--- a/crypto/asn1/a_time.c
+++ b/crypto/asn1/a_time.c
@@ -55,6 +55,7 @@
  * [including the GNU Public Licence.] */
 
 #include <openssl/asn1.h>
+#include <openssl/time.h>
 
 #include <string.h>
 #include <time.h>

crypto/asn1/asn1_test.cc

diff --git a/crypto/asn1/asn1_test.cc b/crypto/asn1/asn1_test.cc
index fc489f7..3182a85 100644
--- a/crypto/asn1/asn1_test.cc
+++ b/crypto/asn1/asn1_test.cc
@@ -29,6 +29,7 @@
 #include <openssl/mem.h>
 #include <openssl/obj.h>
 #include <openssl/span.h>
+#include <openssl/time.h>
 #include <openssl/x509v3.h>
 
 #include "../test/test_util.h"

crypto/asn1/internal.h

diff --git a/crypto/asn1/internal.h b/crypto/asn1/internal.h
index a934bfb..21619c9 100644
--- a/crypto/asn1/internal.h
+++ b/crypto/asn1/internal.h
@@ -71,16 +71,6 @@
 
 // Wrapper functions for time functions.
 
-// OPENSSL_posix_to_tm converts a int64_t POSIX time value in |time| whuch 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 the tm contains out of range values.
-OPENSSL_EXPORT int OPENSSL_tm_to_posix(const struct tm *tm, int64_t *out);
-
 // OPENSSL_gmtime converts a time_t value in |time| which must be in the range
 // of year 0000 to 9999 to a broken out time value in |tm|. On success |tm| is
 // returned. On failure NULL is returned.

crypto/asn1/posix_time.c

diff --git a/crypto/asn1/posix_time.c b/crypto/asn1/posix_time.c
index 7dd9e5b..31d184c 100644
--- a/crypto/asn1/posix_time.c
+++ b/crypto/asn1/posix_time.c
@@ -15,6 +15,8 @@
 // Time conversion to/from POSIX time_t and struct tm, with no support
 // for time zones other than UTC
 
+#include <openssl/time.h>
+
 #include <assert.h>
 #include <inttypes.h>
 #include <limits.h>

include/openssl/time.h

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

util/doc.config

diff --git a/util/doc.config b/util/doc.config
index 8de5f1d..dc05a2b 100644
--- a/util/doc.config
+++ b/util/doc.config
@@ -54,7 +54,8 @@
   },{
     "Name": "Legacy ASN.1 and X.509 implementation (documentation in progress)",
     "Headers": [
-      "include/openssl/asn1.h"
+      "include/openssl/asn1.h",
+      "include/openssl/time.h"
     ]
   },{
     "Name": "SSL implementation",