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1.\" $OpenBSD: X509_cmp_time.3,v 1.12 2024/03/05 18:30:40 tb Exp $
2.\" full merge up to: OpenSSL 83cf7abf May 29 13:07:08 2018 +0100
3.\"
4.\" This file is a derived work.
5.\" The changes are covered by the following Copyright and license:
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7.\" Copyright (c) 2017, 2021 Ingo Schwarze <schwarze@openbsd.org>
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20.\"
21.\" The original file was written by Emilia Kasper <emilia@openssl.org>
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68.Dd $Mdocdate: March 5 2024 $
69.Dt X509_CMP_TIME 3
70.Os
71.Sh NAME
72.Nm X509_cmp_time ,
73.Nm X509_cmp_current_time ,
74.Nm X509_time_adj_ex ,
75.Nm X509_time_adj ,
76.Nm X509_gmtime_adj
77.Nd ASN.1 Time utilities
78.Sh SYNOPSIS
79.In openssl/x509.h
80.Ft int
81.Fo X509_cmp_time
82.Fa "const ASN1_TIME *asn1_time"
83.Fa "time_t *cmp_time"
84.Fc
85.Ft int
86.Fo X509_cmp_current_time
87.Fa "const ASN1_TIME *asn1_time"
88.Fc
89.Ft ASN1_TIME *
90.Fo X509_time_adj_ex
91.Fa "ASN1_TIME *out_time"
92.Fa "int offset_day"
93.Fa "long offset_sec"
94.Fa "time_t *in_time"
95.Fc
96.Ft ASN1_TIME *
97.Fo X509_time_adj
98.Fa "ASN1_TIME *out_time"
99.Fa "long offset_sec"
100.Fa "time_t *in_time"
101.Fc
102.Ft ASN1_TIME *
103.Fo X509_gmtime_adj
104.Fa "ASN1_TIME *out_time"
105.Fa "long offset_sec"
106.Fc
107.Sh DESCRIPTION
108.Fn X509_cmp_time
109parses
110.Fa asn1_time
111and compares it to
112.Fa cmp_time ,
113or to the current time if
114.Fa cmp_time
115is
116.Dv NULL .
117.Fn X509_cmp_current_time
118compares it to the current time.
119.Pp
120.Fn X509_time_adj_ex
121sets
122.Fa out_time
123to a time
124.Fa offset_day
125and
126.Fa offset_sec
127later than
128.Fa in_time .
129The values of
130.Fa offset_day
131and
132.Fa offset_sec
133can be negative to set a time before
134.Fa in_time .
135The
136.Fa offset_sec
137value can also exceed the number of seconds in a day.
138If
139.Fa in_time
140is
141.Dv NULL ,
142the current time is used instead.
143If
144.Fa out_time
145is
146.Dv NULL ,
147a new
148.Vt ASN1_TIME
149structure is allocated and returned.
150.Pp
151.Fn X509_time_adj
152does the same with a 0 day offset.
153.Pp
154.Fn X509_gmtime_adj
155does the same using the current time instead of
156.Fa in_time ,
157that is, it sets
158.Fa out_time
159to a time
160.Fa offset_sec
161seconds later than the current time.
162.Sh RETURN VALUES
163.Fn X509_cmp_time
164and
165.Fn X509_cmp_current_time
166return -1 if
167.Fa asn1_time
168is earlier than or equal to
169.Fa cmp_time ,
1701 if it is later, or 0 on error.
171.Pp
172.Fn X509_time_adj_ex ,
173.Fn X509_time_adj ,
174and
175.Fn X509_gmtime_adj
176return a pointer to the updated or newly allocated
177.Vt ASN1_TIME
178structure or
179.Dv NULL
180on error.
181.Sh SEE ALSO
182.Xr ASN1_TIME_new 3 ,
183.Xr ASN1_TIME_set 3 ,
184.Xr time 3
185.Sh HISTORY
186.Fn X509_cmp_current_time
187and
188.Fn X509_gmtime_adj
189first appeared in SSLeay 0.6.0 and have been available since
190.Ox 2.4 .
191.Pp
192.Fn X509_cmp_time
193and
194.Fn X509_time_adj
195first appeared in OpenSSL 0.9.6 and have been available since
196.Ox 2.9 .
197.Pp
198.Fn X509_time_adj_ex
199first appeared in OpenSSL 1.0.0 and has been available since
200.Ox 4.9 .
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