1 files changed, 200 insertions, 0 deletions
diff --git a/src/crypto/time_support.c b/src/crypto/time_support.c
new file mode 100644
index 0000000..bbfe303
--- /dev/null
+++ b/src/crypto/time_support.c
@@ -0,0 +1,200 @@
+/* Written by Richard Levitte (richard@levitte.org) for the OpenSSL
+ * project 2001.
+ * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+ * project 2008.
+ */
+/* ====================================================================
+ * Copyright (c) 2001 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com). */
+
+#if !defined(_POSIX_C_SOURCE)
+#define _POSIX_C_SOURCE 201410L  /* for gmtime_r */
+#endif
+
+#include <openssl/time_support.h>
+
+#define SECS_PER_DAY (24 * 60 * 60)
+
+struct tm *OPENSSL_gmtime(const time_t *time, struct tm *result) {
+#if defined(OPENSSL_WINDOWS)
+  if (gmtime_s(result, time)) {
+    return NULL;
+  }
+  return result;
+#else
+  return gmtime_r(time, result);
+#endif
+}
+
+/* Convert date to and from julian day Uses Fliegel & Van Flandern algorithm */
+static long date_to_julian(int y, int m, int d) {
+  return (1461 * (y + 4800 + (m - 14) / 12)) / 4 +
+         (367 * (m - 2 - 12 * ((m - 14) / 12))) / 12 -
+         (3 * ((y + 4900 + (m - 14) / 12) / 100)) / 4 + d - 32075;
+}
+
+static void julian_to_date(long jd, int *y, int *m, int *d) {
+  long L = jd + 68569;
+  long n = (4 * L) / 146097;
+  long i, j;
+
+  L = L - (146097 * n + 3) / 4;
+  i = (4000 * (L + 1)) / 1461001;
+  L = L - (1461 * i) / 4 + 31;
+  j = (80 * L) / 2447;
+  *d = L - (2447 * j) / 80;
+  L = j / 11;
+  *m = j + 2 - (12 * L);
+  *y = 100 * (n - 49) + i + L;
+}
+
+/* Convert tm structure and offset into julian day and seconds */
+static int julian_adj(const struct tm *tm, int off_day, long offset_sec,
+                      long *pday, int *psec) {
+  int offset_hms, offset_day;
+  long time_jd;
+  int time_year, time_month, time_day;
+  /* split offset into days and day seconds */
+  offset_day = offset_sec / SECS_PER_DAY;
+  /* Avoid sign issues with % operator */
+  offset_hms = offset_sec - (offset_day * SECS_PER_DAY);
+  offset_day += off_day;
+  /* Add current time seconds to offset */
+  offset_hms += tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec;
+  /* Adjust day seconds if overflow */
+  if (offset_hms >= SECS_PER_DAY) {
+    offset_day++;
+    offset_hms -= SECS_PER_DAY;
+  } else if (offset_hms < 0) {
+    offset_day--;
+    offset_hms += SECS_PER_DAY;
+  }
+
+  /* Convert date of time structure into a Julian day number. */
+
+  time_year = tm->tm_year + 1900;
+  time_month = tm->tm_mon + 1;
+  time_day = tm->tm_mday;
+
+  time_jd = date_to_julian(time_year, time_month, time_day);
+
+  /* Work out Julian day of new date */
+  time_jd += offset_day;
+
+  if (time_jd < 0)
+    return 0;
+
+  *pday = time_jd;
+  *psec = offset_hms;
+  return 1;
+}
+
+int OPENSSL_gmtime_adj(struct tm *tm, int off_day, long offset_sec) {
+  int time_sec, time_year, time_month, time_day;
+  long time_jd;
+
+  /* Convert time and offset into julian day and seconds */
+  if (!julian_adj(tm, off_day, offset_sec, &time_jd, &time_sec))
+    return 0;
+
+  /* Convert Julian day back to date */
+
+  julian_to_date(time_jd, &time_year, &time_month, &time_day);
+
+  if (time_year < 1900 || time_year > 9999)
+    return 0;
+
+  /* Update tm structure */
+
+  tm->tm_year = time_year - 1900;
+  tm->tm_mon = time_month - 1;
+  tm->tm_mday = time_day;
+
+  tm->tm_hour = time_sec / 3600;
+  tm->tm_min = (time_sec / 60) % 60;
+  tm->tm_sec = time_sec % 60;
+
+  return 1;
+}
+
+int OPENSSL_gmtime_diff(int *pday, int *psec, const struct tm *from,
+                        const struct tm *to) {
+  int from_sec, to_sec, diff_sec;
+  long from_jd, to_jd, diff_day;
+
+  if (!julian_adj(from, 0, 0, &from_jd, &from_sec)) {
+    return 0;
+  }
+  if (!julian_adj(to, 0, 0, &to_jd, &to_sec)) {
+    return 0;
+  }
+
+  diff_day = to_jd - from_jd;
+  diff_sec = to_sec - from_sec;
+  /* Adjust differences so both positive or both negative */
+  if (diff_day > 0 && diff_sec < 0) {
+    diff_day--;
+    diff_sec += SECS_PER_DAY;
+  }
+  if (diff_day < 0 && diff_sec > 0) {
+    diff_day++;
+    diff_sec -= SECS_PER_DAY;
+  }
+
+  if (pday) {
+    *pday = (int)diff_day;
+  }
+  if (psec) {
+    *psec = diff_sec;
+  }
+
+  return 1;
+}