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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 1.15 2014/06/12 15:49:27 deraadt 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);
75
76int
77OPENSSL_gmtime_adj(struct tm *tm, int off_day, long offset_sec)
78{
79 int offset_hms, offset_day;
80 long time_jd;
81 int time_year, time_month, time_day;
82 /* split offset into days and day seconds */
83 offset_day = offset_sec / SECS_PER_DAY;
84 /* Avoid sign issues with % operator */
85 offset_hms = offset_sec - (offset_day * SECS_PER_DAY);
86 offset_day += off_day;
87 /* Add current time seconds to offset */
88 offset_hms += tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec;
89 /* Adjust day seconds if overflow */
90 if (offset_hms >= SECS_PER_DAY) {
91 offset_day++;
92 offset_hms -= SECS_PER_DAY;
93 } else if (offset_hms < 0) {
94 offset_day--;
95 offset_hms += SECS_PER_DAY;
96 }
97
98 /* Convert date of time structure into a Julian day number.
99 */
100
101 time_year = tm->tm_year + 1900;
102 time_month = tm->tm_mon + 1;
103 time_day = tm->tm_mday;
104
105 time_jd = date_to_julian(time_year, time_month, time_day);
106
107 /* Work out Julian day of new date */
108 time_jd += offset_day;
109
110 if (time_jd < 0)
111 return 0;
112
113 /* Convert Julian day back to date */
114
115 julian_to_date(time_jd, &time_year, &time_month, &time_day);
116
117 if (time_year < 1900 || time_year > 9999)
118 return 0;
119
120 /* Update tm structure */
121
122 tm->tm_year = time_year - 1900;
123 tm->tm_mon = time_month - 1;
124 tm->tm_mday = time_day;
125
126 tm->tm_hour = offset_hms / 3600;
127 tm->tm_min = (offset_hms / 60) % 60;
128 tm->tm_sec = offset_hms % 60;
129
130 return 1;
131
132}
133
134/* Convert date to and from julian day
135 * Uses Fliegel & Van Flandern algorithm
136 */
137static long
138date_to_julian(int y, int m, int d)
139{
140 return (1461 * (y + 4800 + (m - 14) / 12)) / 4 +
141 (367 * (m - 2 - 12 * ((m - 14) / 12))) / 12 -
142 (3 * ((y + 4900 + (m - 14) / 12) / 100)) / 4 +
143 d - 32075;
144}
145
146static void
147julian_to_date(long jd, int *y, int *m, int *d)
148{
149 long L = jd + 68569;
150 long n = (4 * L) / 146097;
151 long i, j;
152
153 L = L - (146097 * n + 3) / 4;
154 i = (4000 * (L + 1)) / 1461001;
155 L = L - (1461 * i) / 4 + 31;
156 j = (80 * L) / 2447;
157 *d = L - (2447 * j) / 80;
158 L = j / 11;
159 *m = j + 2 - (12 * L);
160 *y = 100 * (n - 49) + i + L;
161}
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