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diff --git a/src/lib/libcrypto/o_time.c b/src/lib/libcrypto/o_time.c
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1/* $OpenBSD: o_time.c,v 1.16 2021/10/27 09:50:56 beck Exp $ */
2/* Written by Richard Levitte (richard@levitte.org) for the OpenSSL
3 * project 2001.
4 */
5/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
6 * project 2008.
7 */
8/* ====================================================================
9 * Copyright (c) 2001 The OpenSSL Project. All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 *
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 *
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in
20 * the documentation and/or other materials provided with the
21 * distribution.
22 *
23 * 3. All advertising materials mentioning features or use of this
24 * software must display the following acknowledgment:
25 * "This product includes software developed by the OpenSSL Project
26 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
27 *
28 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
29 * endorse or promote products derived from this software without
30 * prior written permission. For written permission, please contact
31 * licensing@OpenSSL.org.
32 *
33 * 5. Products derived from this software may not be called "OpenSSL"
34 * nor may "OpenSSL" appear in their names without prior written
35 * permission of the OpenSSL Project.
36 *
37 * 6. Redistributions of any form whatsoever must retain the following
38 * acknowledgment:
39 * "This product includes software developed by the OpenSSL Project
40 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
41 *
42 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
43 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
44 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
45 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
46 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
47 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
48 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
49 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
51 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
52 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
53 * OF THE POSSIBILITY OF SUCH DAMAGE.
54 * ====================================================================
55 *
56 * This product includes cryptographic software written by Eric Young
57 * (eay@cryptsoft.com). This product includes software written by Tim
58 * Hudson (tjh@cryptsoft.com).
59 *
60 */
61
62#include <string.h>
63
64#include "o_time.h"
65
66/* Take a tm structure and add an offset to it. This avoids any OS issues
67 * with restricted date types and overflows which cause the year 2038
68 * problem.
69 */
70
71#define SECS_PER_DAY (24 * 60 * 60)
72
73static long date_to_julian(int y, int m, int d);
74static void julian_to_date(long jd, int *y, int *m, int *d);
75static int julian_adj(const struct tm *tm, int off_day, long offset_sec,
76 long *pday, int *psec);
77
78int
79OPENSSL_gmtime_adj(struct tm *tm, int off_day, long offset_sec)
80{
81 int offset_hms, offset_day;
82 long time_jd;
83 int time_year, time_month, time_day;
84 /* split offset into days and day seconds */
85 offset_day = offset_sec / SECS_PER_DAY;
86 /* Avoid sign issues with % operator */
87 offset_hms = offset_sec - (offset_day * SECS_PER_DAY);
88 offset_day += off_day;
89 /* Add current time seconds to offset */
90 offset_hms += tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec;
91 /* Adjust day seconds if overflow */
92 if (offset_hms >= SECS_PER_DAY) {
93 offset_day++;
94 offset_hms -= SECS_PER_DAY;
95 } else if (offset_hms < 0) {
96 offset_day--;
97 offset_hms += SECS_PER_DAY;
98 }
99
100 /* Convert date of time structure into a Julian day number.
101 */
102
103 time_year = tm->tm_year + 1900;
104 time_month = tm->tm_mon + 1;
105 time_day = tm->tm_mday;
106
107 time_jd = date_to_julian(time_year, time_month, time_day);
108
109 /* Work out Julian day of new date */
110 time_jd += offset_day;
111
112 if (time_jd < 0)
113 return 0;
114
115 /* Convert Julian day back to date */
116
117 julian_to_date(time_jd, &time_year, &time_month, &time_day);
118
119 if (time_year < 1900 || time_year > 9999)
120 return 0;
121
122 /* Update tm structure */
123
124 tm->tm_year = time_year - 1900;
125 tm->tm_mon = time_month - 1;
126 tm->tm_mday = time_day;
127
128 tm->tm_hour = offset_hms / 3600;
129 tm->tm_min = (offset_hms / 60) % 60;
130 tm->tm_sec = offset_hms % 60;
131
132 return 1;
133
134}
135
136int
137OPENSSL_gmtime_diff(int *pday, int *psec, const struct tm *from,
138 const struct tm *to)
139{
140 int from_sec, to_sec, diff_sec;
141 long from_jd, to_jd, diff_day;
142
143 if (!julian_adj(from, 0, 0, &from_jd, &from_sec))
144 return 0;
145 if (!julian_adj(to, 0, 0, &to_jd, &to_sec))
146 return 0;
147 diff_day = to_jd - from_jd;
148 diff_sec = to_sec - from_sec;
149 /* Adjust differences so both positive or both negative */
150 if (diff_day > 0 && diff_sec < 0) {
151 diff_day--;
152 diff_sec += SECS_PER_DAY;
153 }
154 if (diff_day < 0 && diff_sec > 0) {
155 diff_day++;
156 diff_sec -= SECS_PER_DAY;
157 }
158
159 if (pday)
160 *pday = (int)diff_day;
161 if (psec)
162 *psec = diff_sec;
163
164 return 1;
165
166}
167
168/* Convert tm structure and offset into julian day and seconds */
169static int
170julian_adj(const struct tm *tm, int off_day, long offset_sec, long *pday,
171 int *psec)
172{
173 int time_year, time_month, time_day;
174 long offset_day, time_jd;
175 int offset_hms;
176
177 /* split offset into days and day seconds */
178 offset_day = offset_sec / SECS_PER_DAY;
179 /* Avoid sign issues with % operator */
180 offset_hms = offset_sec - (offset_day * SECS_PER_DAY);
181 offset_day += off_day;
182 /* Add current time seconds to offset */
183 offset_hms += tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec;
184 /* Adjust day seconds if overflow */
185 if (offset_hms >= SECS_PER_DAY) {
186 offset_day++;
187 offset_hms -= SECS_PER_DAY;
188 } else if (offset_hms < 0) {
189 offset_day--;
190 offset_hms += SECS_PER_DAY;
191 }
192
193 /*
194 * Convert date of time structure into a Julian day number.
195 */
196
197 time_year = tm->tm_year + 1900;
198 time_month = tm->tm_mon + 1;
199 time_day = tm->tm_mday;
200
201 time_jd = date_to_julian(time_year, time_month, time_day);
202
203 /* Work out Julian day of new date */
204 time_jd += offset_day;
205
206 if (time_jd < 0)
207 return 0;
208
209 *pday = time_jd;
210 *psec = offset_hms;
211
212 return 1;
213}
214
215/* Convert date to and from julian day
216 * Uses Fliegel & Van Flandern algorithm
217 */
218static long
219date_to_julian(int y, int m, int d)
220{
221 return (1461 * (y + 4800 + (m - 14) / 12)) / 4 +
222 (367 * (m - 2 - 12 * ((m - 14) / 12))) / 12 -
223 (3 * ((y + 4900 + (m - 14) / 12) / 100)) / 4 +
224 d - 32075;
225}
226
227static void
228julian_to_date(long jd, int *y, int *m, int *d)
229{
230 long L = jd + 68569;
231 long n = (4 * L) / 146097;
232 long i, j;
233
234 L = L - (146097 * n + 3) / 4;
235 i = (4000 * (L + 1)) / 1461001;
236 L = L - (1461 * i) / 4 + 31;
237 j = (80 * L) / 2447;
238 *d = L - (2447 * j) / 80;
239 L = j / 11;
240 *m = j + 2 - (12 * L);
241 *y = 100 * (n - 49) + i + L;
242}
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