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1 /* Written by Richard Levitte (richard@levitte.org) for the OpenSSL
2  * project 2001.
3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
4  * project 2008.
5  */
6 /* ====================================================================
7  * Copyright (c) 2001 The OpenSSL Project.  All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  *
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in
18  *    the documentation and/or other materials provided with the
19  *    distribution.
20  *
21  * 3. All advertising materials mentioning features or use of this
22  *    software must display the following acknowledgment:
23  *    "This product includes software developed by the OpenSSL Project
24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25  *
26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27  *    endorse or promote products derived from this software without
28  *    prior written permission. For written permission, please contact
29  *    licensing@OpenSSL.org.
30  *
31  * 5. Products derived from this software may not be called "OpenSSL"
32  *    nor may "OpenSSL" appear in their names without prior written
33  *    permission of the OpenSSL Project.
34  *
35  * 6. Redistributions of any form whatsoever must retain the following
36  *    acknowledgment:
37  *    "This product includes software developed by the OpenSSL Project
38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39  *
40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51  * OF THE POSSIBILITY OF SUCH DAMAGE.
52  * ====================================================================
53  *
54  * This product includes cryptographic software written by Eric Young
55  * (eay@cryptsoft.com).  This product includes software written by Tim
56  * Hudson (tjh@cryptsoft.com). */
57 
58 #if !defined(_POSIX_C_SOURCE)
59 #define _POSIX_C_SOURCE 201410L  /* for gmtime_r */
60 #endif
61 
62 #include "asn1_locl.h"
63 
64 #include <time.h>
65 
66 
67 #define SECS_PER_DAY (24 * 60 * 60)
68 
OPENSSL_gmtime(const time_t * time,struct tm * result)69 struct tm *OPENSSL_gmtime(const time_t *time, struct tm *result) {
70 #if defined(OPENSSL_WINDOWS)
71   if (gmtime_s(result, time)) {
72     return NULL;
73   }
74   return result;
75 #else
76   return gmtime_r(time, result);
77 #endif
78 }
79 
80 /* Convert date to and from julian day Uses Fliegel & Van Flandern algorithm */
date_to_julian(int y,int m,int d)81 static long date_to_julian(int y, int m, int d) {
82   return (1461 * (y + 4800 + (m - 14) / 12)) / 4 +
83          (367 * (m - 2 - 12 * ((m - 14) / 12))) / 12 -
84          (3 * ((y + 4900 + (m - 14) / 12) / 100)) / 4 + d - 32075;
85 }
86 
julian_to_date(long jd,int * y,int * m,int * d)87 static void julian_to_date(long jd, int *y, int *m, int *d) {
88   long L = jd + 68569;
89   long n = (4 * L) / 146097;
90   long i, j;
91 
92   L = L - (146097 * n + 3) / 4;
93   i = (4000 * (L + 1)) / 1461001;
94   L = L - (1461 * i) / 4 + 31;
95   j = (80 * L) / 2447;
96   *d = L - (2447 * j) / 80;
97   L = j / 11;
98   *m = j + 2 - (12 * L);
99   *y = 100 * (n - 49) + i + L;
100 }
101 
102 /* Convert tm structure and offset into julian day and seconds */
julian_adj(const struct tm * tm,int off_day,long offset_sec,long * pday,int * psec)103 static int julian_adj(const struct tm *tm, int off_day, long offset_sec,
104                       long *pday, int *psec) {
105   int offset_hms, offset_day;
106   long time_jd;
107   int time_year, time_month, time_day;
108   /* split offset into days and day seconds */
109   offset_day = offset_sec / SECS_PER_DAY;
110   /* Avoid sign issues with % operator */
111   offset_hms = offset_sec - (offset_day * SECS_PER_DAY);
112   offset_day += off_day;
113   /* Add current time seconds to offset */
114   offset_hms += tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec;
115   /* Adjust day seconds if overflow */
116   if (offset_hms >= SECS_PER_DAY) {
117     offset_day++;
118     offset_hms -= SECS_PER_DAY;
119   } else if (offset_hms < 0) {
120     offset_day--;
121     offset_hms += SECS_PER_DAY;
122   }
123 
124   /* Convert date of time structure into a Julian day number. */
125 
126   time_year = tm->tm_year + 1900;
127   time_month = tm->tm_mon + 1;
128   time_day = tm->tm_mday;
129 
130   time_jd = date_to_julian(time_year, time_month, time_day);
131 
132   /* Work out Julian day of new date */
133   time_jd += offset_day;
134 
135   if (time_jd < 0) {
136     return 0;
137   }
138 
139   *pday = time_jd;
140   *psec = offset_hms;
141   return 1;
142 }
143 
OPENSSL_gmtime_adj(struct tm * tm,int off_day,long offset_sec)144 int OPENSSL_gmtime_adj(struct tm *tm, int off_day, long offset_sec) {
145   int time_sec, time_year, time_month, time_day;
146   long time_jd;
147 
148   /* Convert time and offset into julian day and seconds */
149   if (!julian_adj(tm, off_day, offset_sec, &time_jd, &time_sec)) {
150     return 0;
151   }
152 
153   /* Convert Julian day back to date */
154 
155   julian_to_date(time_jd, &time_year, &time_month, &time_day);
156 
157   if (time_year < 1900 || time_year > 9999) {
158     return 0;
159   }
160 
161   /* Update tm structure */
162 
163   tm->tm_year = time_year - 1900;
164   tm->tm_mon = time_month - 1;
165   tm->tm_mday = time_day;
166 
167   tm->tm_hour = time_sec / 3600;
168   tm->tm_min = (time_sec / 60) % 60;
169   tm->tm_sec = time_sec % 60;
170 
171   return 1;
172 }
173 
OPENSSL_gmtime_diff(int * out_days,int * out_secs,const struct tm * from,const struct tm * to)174 int OPENSSL_gmtime_diff(int *out_days, int *out_secs, const struct tm *from,
175                         const struct tm *to) {
176   int from_sec, to_sec, diff_sec;
177   long from_jd, to_jd, diff_day;
178 
179   if (!julian_adj(from, 0, 0, &from_jd, &from_sec)) {
180     return 0;
181   }
182   if (!julian_adj(to, 0, 0, &to_jd, &to_sec)) {
183     return 0;
184   }
185 
186   diff_day = to_jd - from_jd;
187   diff_sec = to_sec - from_sec;
188   /* Adjust differences so both positive or both negative */
189   if (diff_day > 0 && diff_sec < 0) {
190     diff_day--;
191     diff_sec += SECS_PER_DAY;
192   }
193   if (diff_day < 0 && diff_sec > 0) {
194     diff_day++;
195     diff_sec -= SECS_PER_DAY;
196   }
197 
198   if (out_days) {
199     *out_days = (int)diff_day;
200   }
201   if (out_secs) {
202     *out_secs = diff_sec;
203   }
204 
205   return 1;
206 }
207