mirror of
https://github.com/openssl/openssl.git
synced 2024-12-21 06:09:35 +08:00
d47eaaf41f
Reviewed-by: Tim Hudson <tjh@openssl.org> Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/5569)
259 lines
11 KiB
Plaintext
259 lines
11 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
ASN1_TIME_set, ASN1_UTCTIME_set, ASN1_GENERALIZEDTIME_set,
|
|
ASN1_TIME_adj, ASN1_UTCTIME_adj, ASN1_GENERALIZEDTIME_adj,
|
|
ASN1_TIME_check, ASN1_UTCTIME_check, ASN1_GENERALIZEDTIME_check,
|
|
ASN1_TIME_set_string, ASN1_UTCTIME_set_string, ASN1_GENERALIZEDTIME_set_string,
|
|
ASN1_TIME_set_string_X509,
|
|
ASN1_TIME_normalize,
|
|
ASN1_TIME_to_tm,
|
|
ASN1_TIME_print, ASN1_UTCTIME_print, ASN1_GENERALIZEDTIME_print,
|
|
ASN1_TIME_diff,
|
|
ASN1_TIME_cmp_time_t, ASN1_UTCTIME_cmp_time_t,
|
|
ASN1_TIME_compare,
|
|
ASN1_TIME_to_generalizedtime - ASN.1 Time functions
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
ASN1_TIME *ASN1_TIME_set(ASN1_TIME *s, time_t t);
|
|
ASN1_UTCTIME *ASN1_UTCTIME_set(ASN1_UTCTIME *s, time_t t);
|
|
ASN1_GENERALIZEDTIME *ASN1_GENERALIZEDTIME_set(ASN1_GENERALIZEDTIME *s,
|
|
time_t t);
|
|
|
|
ASN1_TIME *ASN1_TIME_adj(ASN1_TIME *s, time_t t, int offset_day,
|
|
long offset_sec);
|
|
ASN1_UTCTIME *ASN1_UTCTIME_adj(ASN1_UTCTIME *s, time_t t,
|
|
int offset_day, long offset_sec);
|
|
ASN1_GENERALIZEDTIME *ASN1_GENERALIZEDTIME_adj(ASN1_GENERALIZEDTIME *s,
|
|
time_t t, int offset_day,
|
|
long offset_sec);
|
|
|
|
int ASN1_TIME_set_string(ASN1_TIME *s, const char *str);
|
|
int ASN1_TIME_set_string_X509(ASN1_TIME *s, const char *str);
|
|
int ASN1_UTCTIME_set_string(ASN1_UTCTIME *s, const char *str);
|
|
int ASN1_GENERALIZEDTIME_set_string(ASN1_GENERALIZEDTIME *s,
|
|
const char *str);
|
|
|
|
int ASN1_TIME_normalize(ASN1_TIME *s);
|
|
|
|
int ASN1_TIME_check(const ASN1_TIME *t);
|
|
int ASN1_UTCTIME_check(const ASN1_UTCTIME *t);
|
|
int ASN1_GENERALIZEDTIME_check(const ASN1_GENERALIZEDTIME *t);
|
|
|
|
int ASN1_TIME_print(BIO *b, const ASN1_TIME *s);
|
|
int ASN1_UTCTIME_print(BIO *b, const ASN1_UTCTIME *s);
|
|
int ASN1_GENERALIZEDTIME_print(BIO *b, const ASN1_GENERALIZEDTIME *s);
|
|
|
|
int ASN1_TIME_to_tm(const ASN1_TIME *s, struct tm *tm);
|
|
int ASN1_TIME_diff(int *pday, int *psec, const ASN1_TIME *from,
|
|
const ASN1_TIME *to);
|
|
|
|
int ASN1_TIME_cmp_time_t(const ASN1_TIME *s, time_t t);
|
|
int ASN1_UTCTIME_cmp_time_t(const ASN1_UTCTIME *s, time_t t);
|
|
|
|
int ASN1_TIME_compare(const ASN1_TIME *a, const ASN1_TIME *b);
|
|
|
|
ASN1_GENERALIZEDTIME *ASN1_TIME_to_generalizedtime(ASN1_TIME *t,
|
|
ASN1_GENERALIZEDTIME **out);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
The ASN1_TIME_set(), ASN1_UTCTIME_set() and ASN1_GENERALIZEDTIME_set()
|
|
functions set the structure B<s> to the time represented by the time_t
|
|
value B<t>. If B<s> is NULL a new time structure is allocated and returned.
|
|
|
|
The ASN1_TIME_adj(), ASN1_UTCTIME_adj() and ASN1_GENERALIZEDTIME_adj()
|
|
functions set the time structure B<s> to the time represented
|
|
by the time B<offset_day> and B<offset_sec> after the time_t value B<t>.
|
|
The values of B<offset_day> or B<offset_sec> can be negative to set a
|
|
time before B<t>. The B<offset_sec> value can also exceed the number of
|
|
seconds in a day. If B<s> is NULL a new structure is allocated
|
|
and returned.
|
|
|
|
The ASN1_TIME_set_string(), ASN1_UTCTIME_set_string() and
|
|
ASN1_GENERALIZEDTIME_set_string() functions set the time structure B<s>
|
|
to the time represented by string B<str> which must be in appropriate ASN.1
|
|
time format (for example YYMMDDHHMMSSZ or YYYYMMDDHHMMSSZ). If B<s> is NULL
|
|
this function performs a format check on B<str> only. The string B<str>
|
|
is copied into B<s>.
|
|
|
|
ASN1_TIME_set_string_X509() sets ASN1_TIME structure B<s> to the time
|
|
represented by string B<str> which must be in appropriate time format
|
|
that RFC 5280 requires, which means it only allows YYMMDDHHMMSSZ and
|
|
YYYYMMDDHHMMSSZ (leap second is rejected), all other ASN.1 time format
|
|
are not allowed. If B<s> is NULL this function performs a format check
|
|
on B<str> only.
|
|
|
|
The ASN1_TIME_normalize() function converts an ASN1_GENERALIZEDTIME or
|
|
ASN1_UTCTIME into a time value that can be used in a certificate. It
|
|
should be used after the ASN1_TIME_set_string() functions and before
|
|
ASN1_TIME_print() functions to get consistent (i.e. GMT) results.
|
|
|
|
The ASN1_TIME_check(), ASN1_UTCTIME_check() and ASN1_GENERALIZEDTIME_check()
|
|
functions check the syntax of the time structure B<s>.
|
|
|
|
The ASN1_TIME_print(), ASN1_UTCTIME_print() and ASN1_GENERALIZEDTIME_print()
|
|
functions print the time structure B<s> to BIO B<b> in human readable
|
|
format. It will be of the format MMM DD HH:MM:SS YYYY [GMT], for example
|
|
"Feb 3 00:55:52 2015 GMT" it does not include a newline. If the time
|
|
structure has invalid format it prints out "Bad time value" and returns
|
|
an error. The output for generalized time may include a fractional part
|
|
following the second.
|
|
|
|
ASN1_TIME_to_tm() converts the time B<s> to the standard B<tm> structure.
|
|
If B<s> is NULL, then the current time is converted. The output time is GMT.
|
|
The B<tm_sec>, B<tm_min>, B<tm_hour>, B<tm_mday>, B<tm_wday>, B<tm_yday>,
|
|
B<tm_mon> and B<tm_year> fields of B<tm> structure are set to proper values,
|
|
whereas all other fields are set to 0. If B<tm> is NULL this function performs
|
|
a format check on B<s> only. If B<s> is in Generalized format with fractional
|
|
seconds, e.g. YYYYMMDDHHMMSS.SSSZ, the fractional seconds will be lost while
|
|
converting B<s> to B<tm> structure.
|
|
|
|
ASN1_TIME_diff() sets B<*pday> and B<*psec> to the time difference between
|
|
B<from> and B<to>. If B<to> represents a time later than B<from> then
|
|
one or both (depending on the time difference) of B<*pday> and B<*psec>
|
|
will be positive. If B<to> represents a time earlier than B<from> then
|
|
one or both of B<*pday> and B<*psec> will be negative. If B<to> and B<from>
|
|
represent the same time then B<*pday> and B<*psec> will both be zero.
|
|
If both B<*pday> and B<*psec> are non-zero they will always have the same
|
|
sign. The value of B<*psec> will always be less than the number of seconds
|
|
in a day. If B<from> or B<to> is NULL the current time is used.
|
|
|
|
The ASN1_TIME_cmp_time_t() and ASN1_UTCTIME_cmp_time_t() functions compare
|
|
the two times represented by the time structure B<s> and the time_t B<t>.
|
|
|
|
The ASN1_TIME_compare() function compares the two times represented by the
|
|
time structures B<a> and B<b>.
|
|
|
|
The ASN1_TIME_to_generalizedtime() function converts an ASN1_TIME to an
|
|
ASN1_GENERALIZEDTIME, regardless of year. If either B<out> or
|
|
B<*out> are NULL, then a new object is allocated and must be freed after use.
|
|
|
|
=head1 NOTES
|
|
|
|
The ASN1_TIME structure corresponds to the ASN.1 structure B<Time>
|
|
defined in RFC5280 et al. The time setting functions obey the rules outlined
|
|
in RFC5280: if the date can be represented by UTCTime it is used, else
|
|
GeneralizedTime is used.
|
|
|
|
The ASN1_TIME, ASN1_UTCTIME and ASN1_GENERALIZEDTIME structures are represented
|
|
as an ASN1_STRING internally and can be freed up using ASN1_STRING_free().
|
|
|
|
The ASN1_TIME structure can represent years from 0000 to 9999 but no attempt
|
|
is made to correct ancient calendar changes (for example from Julian to
|
|
Gregorian calendars).
|
|
|
|
ASN1_UTCTIME is limited to a year range of 1950 through 2049.
|
|
|
|
Some applications add offset times directly to a time_t value and pass the
|
|
results to ASN1_TIME_set() (or equivalent). This can cause problems as the
|
|
time_t value can overflow on some systems resulting in unexpected results.
|
|
New applications should use ASN1_TIME_adj() instead and pass the offset value
|
|
in the B<offset_sec> and B<offset_day> parameters instead of directly
|
|
manipulating a time_t value.
|
|
|
|
ASN1_TIME_adj() may change the type from ASN1_GENERALIZEDTIME to ASN1_UTCTIME,
|
|
or vice versa, based on the resulting year. The ASN1_GENERALIZEDTIME_adj() and
|
|
ASN1_UTCTIME_adj() functions will not modify the type of the return structure.
|
|
|
|
It is recommended that functions starting with ASN1_TIME be used instead of
|
|
those starting with ASN1_UTCTIME or ASN1_GENERALIZEDTIME. The functions
|
|
starting with ASN1_UTCTIME and ASN1_GENERALIZEDTIME act only on that specific
|
|
time format. The functions starting with ASN1_TIME will operate on either
|
|
format.
|
|
|
|
=head1 BUGS
|
|
|
|
ASN1_TIME_print(), ASN1_UTCTIME_print() and ASN1_GENERALIZEDTIME_print()
|
|
do not print out the time zone: it either prints out "GMT" or nothing. But all
|
|
certificates complying with RFC5280 et al use GMT anyway.
|
|
|
|
Use the ASN1_TIME_normalize() function to normalize the time value before
|
|
printing to get GMT results.
|
|
|
|
=head1 EXAMPLES
|
|
|
|
Set a time structure to one hour after the current time and print it out:
|
|
|
|
#include <time.h>
|
|
#include <openssl/asn1.h>
|
|
|
|
ASN1_TIME *tm;
|
|
time_t t;
|
|
BIO *b;
|
|
|
|
t = time(NULL);
|
|
tm = ASN1_TIME_adj(NULL, t, 0, 60 * 60);
|
|
b = BIO_new_fp(stdout, BIO_NOCLOSE);
|
|
ASN1_TIME_print(b, tm);
|
|
ASN1_STRING_free(tm);
|
|
BIO_free(b);
|
|
|
|
Determine if one time is later or sooner than the current time:
|
|
|
|
int day, sec;
|
|
|
|
if (!ASN1_TIME_diff(&day, &sec, NULL, to))
|
|
/* Invalid time format */
|
|
|
|
if (day > 0 || sec > 0)
|
|
printf("Later\n");
|
|
else if (day < 0 || sec < 0)
|
|
printf("Sooner\n");
|
|
else
|
|
printf("Same\n");
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
ASN1_TIME_set(), ASN1_UTCTIME_set(), ASN1_GENERALIZEDTIME_set(), ASN1_TIME_adj(),
|
|
ASN1_UTCTIME_adj and ASN1_GENERALIZEDTIME_set return a pointer to a time structure
|
|
or NULL if an error occurred.
|
|
|
|
ASN1_TIME_set_string(), ASN1_UTCTIME_set_string(), ASN1_GENERALIZEDTIME_set_string()
|
|
ASN1_TIME_set_string_X509() return 1 if the time value is successfully set and 0 otherwise.
|
|
|
|
ASN1_TIME_normalize() returns 1 on success, and 0 on error.
|
|
|
|
ASN1_TIME_check(), ASN1_UTCTIME_check and ASN1_GENERALIZEDTIME_check() return 1
|
|
if the structure is syntactically correct and 0 otherwise.
|
|
|
|
ASN1_TIME_print(), ASN1_UTCTIME_print() and ASN1_GENERALIZEDTIME_print() return 1
|
|
if the time is successfully printed out and 0 if an error occurred (I/O error or
|
|
invalid time format).
|
|
|
|
ASN1_TIME_to_tm() returns 1 if the time is successfully parsed and 0 if an
|
|
error occurred (invalid time format).
|
|
|
|
ASN1_TIME_diff() returns 1 for success and 0 for failure. It can fail if the
|
|
passed-in time structure has invalid syntax, for example.
|
|
|
|
ASN1_TIME_cmp_time_t() and ASN1_UTCTIME_cmp_time_t() return -1 if B<s> is
|
|
before B<t>, 0 if B<s> equals B<t>, or 1 if B<s> is after B<t>. -2 is returned
|
|
on error.
|
|
|
|
ASN1_TIME_compare() returns -1 if B<a> is before B<b>, 0 if B<a> equals B<b>, or 1 if B<a> is after B<b>. -2 is returned on error.
|
|
|
|
ASN1_TIME_to_generalizedtime() returns a pointer to
|
|
the appropriate time structure on success or NULL if an error occurred.
|
|
|
|
=head1 HISTORY
|
|
|
|
The ASN1_TIME_to_tm() function was added in OpenSSL 1.1.1.
|
|
The ASN1_TIME_set_string_X509() function was added in OpenSSL 1.1.1.
|
|
The ASN1_TIME_normalize() function was added in OpenSSL 1.1.1.
|
|
The ASN1_TIME_cmp_time_t() function was added in OpenSSL 1.1.1.
|
|
The ASN1_TIME_compare() function was added in OpenSSL 1.1.1.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2015-2017 The OpenSSL Project Authors. All Rights Reserved.
|
|
|
|
Licensed under the OpenSSL license (the "License"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file LICENSE in the source distribution or at
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|