mirror of https://github.com/openssl/openssl.git
287 lines
12 KiB
Plaintext
287 lines
12 KiB
Plaintext
=pod
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=head1 NAME
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ASN1_TIME_set, ASN1_UTCTIME_set, ASN1_GENERALIZEDTIME_set,
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ASN1_TIME_adj, ASN1_UTCTIME_adj, ASN1_GENERALIZEDTIME_adj,
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ASN1_TIME_check, ASN1_UTCTIME_check, ASN1_GENERALIZEDTIME_check,
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ASN1_TIME_set_string, ASN1_UTCTIME_set_string, ASN1_GENERALIZEDTIME_set_string,
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ASN1_TIME_set_string_X509,
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ASN1_TIME_normalize,
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ASN1_TIME_to_tm,
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ASN1_TIME_print, ASN1_TIME_print_ex, ASN1_UTCTIME_print, ASN1_GENERALIZEDTIME_print,
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ASN1_TIME_diff,
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ASN1_TIME_cmp_time_t, ASN1_UTCTIME_cmp_time_t,
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ASN1_TIME_compare,
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ASN1_TIME_to_generalizedtime,
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ASN1_TIME_dup, ASN1_UTCTIME_dup, ASN1_GENERALIZEDTIME_dup - ASN.1 Time functions
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=head1 SYNOPSIS
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ASN1_TIME *ASN1_TIME_set(ASN1_TIME *s, time_t t);
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ASN1_UTCTIME *ASN1_UTCTIME_set(ASN1_UTCTIME *s, time_t t);
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ASN1_GENERALIZEDTIME *ASN1_GENERALIZEDTIME_set(ASN1_GENERALIZEDTIME *s,
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time_t t);
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ASN1_TIME *ASN1_TIME_adj(ASN1_TIME *s, time_t t, int offset_day,
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long offset_sec);
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ASN1_UTCTIME *ASN1_UTCTIME_adj(ASN1_UTCTIME *s, time_t t,
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int offset_day, long offset_sec);
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ASN1_GENERALIZEDTIME *ASN1_GENERALIZEDTIME_adj(ASN1_GENERALIZEDTIME *s,
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time_t t, int offset_day,
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long offset_sec);
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int ASN1_TIME_set_string(ASN1_TIME *s, const char *str);
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int ASN1_TIME_set_string_X509(ASN1_TIME *s, const char *str);
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int ASN1_UTCTIME_set_string(ASN1_UTCTIME *s, const char *str);
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int ASN1_GENERALIZEDTIME_set_string(ASN1_GENERALIZEDTIME *s,
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const char *str);
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int ASN1_TIME_normalize(ASN1_TIME *s);
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int ASN1_TIME_check(const ASN1_TIME *t);
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int ASN1_UTCTIME_check(const ASN1_UTCTIME *t);
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int ASN1_GENERALIZEDTIME_check(const ASN1_GENERALIZEDTIME *t);
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int ASN1_TIME_print(BIO *b, const ASN1_TIME *s);
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int ASN1_TIME_print_ex(BIO *bp, const ASN1_TIME *tm, unsigned long flags);
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int ASN1_UTCTIME_print(BIO *b, const ASN1_UTCTIME *s);
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int ASN1_GENERALIZEDTIME_print(BIO *b, const ASN1_GENERALIZEDTIME *s);
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int ASN1_TIME_to_tm(const ASN1_TIME *s, struct tm *tm);
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int ASN1_TIME_diff(int *pday, int *psec, const ASN1_TIME *from,
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const ASN1_TIME *to);
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int ASN1_TIME_cmp_time_t(const ASN1_TIME *s, time_t t);
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int ASN1_UTCTIME_cmp_time_t(const ASN1_UTCTIME *s, time_t t);
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int ASN1_TIME_compare(const ASN1_TIME *a, const ASN1_TIME *b);
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ASN1_GENERALIZEDTIME *ASN1_TIME_to_generalizedtime(ASN1_TIME *t,
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ASN1_GENERALIZEDTIME **out);
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ASN1_TIME *ASN1_TIME_dup(const ASN1_TIME *t);
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ASN1_UTCTIME *ASN1_UTCTIME_dup(const ASN1_UTCTIME *t);
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ASN1_GENERALIZEDTIME *ASN1_GENERALIZEDTIME_dup(const ASN1_GENERALIZEDTIME *t);
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=head1 DESCRIPTION
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The ASN1_TIME_set(), ASN1_UTCTIME_set() and ASN1_GENERALIZEDTIME_set()
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functions set the structure I<s> to the time represented by the time_t
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value I<t>. If I<s> is NULL a new time structure is allocated and returned.
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The ASN1_TIME_adj(), ASN1_UTCTIME_adj() and ASN1_GENERALIZEDTIME_adj()
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functions set the time structure I<s> to the time represented
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by the time I<offset_day> and I<offset_sec> after the time_t value I<t>.
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The values of I<offset_day> or I<offset_sec> can be negative to set a
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time before I<t>. The I<offset_sec> value can also exceed the number of
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seconds in a day. If I<s> is NULL a new structure is allocated
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and returned.
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The ASN1_TIME_set_string(), ASN1_UTCTIME_set_string() and
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ASN1_GENERALIZEDTIME_set_string() functions set the time structure I<s>
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to the time represented by string I<str> which must be in appropriate ASN.1
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time format (for example YYMMDDHHMMSSZ or YYYYMMDDHHMMSSZ). If I<s> is NULL
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this function performs a format check on I<str> only. The string I<str>
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is copied into I<s>.
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ASN1_TIME_set_string_X509() sets B<ASN1_TIME> structure I<s> to the time
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represented by string I<str> which must be in appropriate time format
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that RFC 5280 requires, which means it only allows YYMMDDHHMMSSZ and
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YYYYMMDDHHMMSSZ (leap second is rejected), all other ASN.1 time format
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are not allowed. If I<s> is NULL this function performs a format check
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on I<str> only.
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The ASN1_TIME_normalize() function converts an B<ASN1_GENERALIZEDTIME> or
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B<ASN1_UTCTIME> into a time value that can be used in a certificate. It
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should be used after the ASN1_TIME_set_string() functions and before
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ASN1_TIME_print() functions to get consistent (i.e. GMT) results.
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The ASN1_TIME_check(), ASN1_UTCTIME_check() and ASN1_GENERALIZEDTIME_check()
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functions check the syntax of the time structure I<s>.
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The ASN1_TIME_print(), ASN1_UTCTIME_print() and ASN1_GENERALIZEDTIME_print()
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functions print the time structure I<s> to BIO I<b> in human readable
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format. It will be of the format MMM DD HH:MM:SS[.s*] YYYY GMT, for example
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"Feb E<32>3 00:55:52 2015 GMT", which does not include a newline.
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If the time structure has invalid format it prints out "Bad time value" and
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returns an error. The output for generalized time may include a fractional part
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following the second.
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ASN1_TIME_print_ex() provides I<flags> to specify the output format of the
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datetime. This can be either B<ASN1_DTFLGS_RFC822> or B<ASN1_DTFLGS_ISO8601>.
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ASN1_TIME_to_tm() converts the time I<s> to the standard I<tm> structure.
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If I<s> is NULL, then the current time is converted. The output time is GMT.
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The I<tm_sec>, I<tm_min>, I<tm_hour>, I<tm_mday>, I<tm_wday>, I<tm_yday>,
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I<tm_mon> and I<tm_year> fields of I<tm> structure are set to proper values,
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whereas all other fields are set to 0. If I<tm> is NULL this function performs
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a format check on I<s> only. If I<s> is in Generalized format with fractional
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seconds, e.g. YYYYMMDDHHMMSS.SSSZ, the fractional seconds will be lost while
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converting I<s> to I<tm> structure.
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ASN1_TIME_diff() sets I<*pday> and I<*psec> to the time difference between
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I<from> and I<to>. If I<to> represents a time later than I<from> then
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one or both (depending on the time difference) of I<*pday> and I<*psec>
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will be positive. If I<to> represents a time earlier than I<from> then
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one or both of I<*pday> and I<*psec> will be negative. If I<to> and I<from>
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represent the same time then I<*pday> and I<*psec> will both be zero.
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If both I<*pday> and I<*psec> are nonzero they will always have the same
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sign. The value of I<*psec> will always be less than the number of seconds
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in a day. If I<from> or I<to> is NULL the current time is used.
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The ASN1_TIME_cmp_time_t() and ASN1_UTCTIME_cmp_time_t() functions compare
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the two times represented by the time structure I<s> and the time_t I<t>.
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The ASN1_TIME_compare() function compares the two times represented by the
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time structures I<a> and I<b>.
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The ASN1_TIME_to_generalizedtime() function converts an B<ASN1_TIME> to an
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B<ASN1_GENERALIZEDTIME>, regardless of year. If either I<out> or
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I<*out> are NULL, then a new object is allocated and must be freed after use.
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The ASN1_TIME_dup(), ASN1_UTCTIME_dup() and ASN1_GENERALIZEDTIME_dup() functions
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duplicate the time structure I<t> and return the duplicated result
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correspondingly.
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=head1 NOTES
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The B<ASN1_TIME> structure corresponds to the ASN.1 structure B<Time>
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defined in RFC5280 et al. The time setting functions obey the rules outlined
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in RFC5280: if the date can be represented by UTCTime it is used, else
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GeneralizedTime is used.
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The B<ASN1_TIME>, B<ASN1_UTCTIME> and B<ASN1_GENERALIZEDTIME> structures are
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represented as an B<ASN1_STRING> internally and can be freed up using
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ASN1_STRING_free().
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The B<ASN1_TIME> structure can represent years from 0000 to 9999 but no attempt
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is made to correct ancient calendar changes (for example from Julian to
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Gregorian calendars).
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B<ASN1_UTCTIME> is limited to a year range of 1950 through 2049.
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Some applications add offset times directly to a time_t value and pass the
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results to ASN1_TIME_set() (or equivalent). This can cause problems as the
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time_t value can overflow on some systems resulting in unexpected results.
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New applications should use ASN1_TIME_adj() instead and pass the offset value
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in the I<offset_sec> and I<offset_day> parameters instead of directly
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manipulating a time_t value.
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ASN1_TIME_adj() may change the type from B<ASN1_GENERALIZEDTIME> to
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B<ASN1_UTCTIME>, or vice versa, based on the resulting year.
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ASN1_GENERALIZEDTIME_adj() and ASN1_UTCTIME_adj() will not modify the type
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of the return structure.
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It is recommended that functions starting with B<ASN1_TIME> be used instead of
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those starting with B<ASN1_UTCTIME> or B<ASN1_GENERALIZEDTIME>. The functions
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starting with B<ASN1_UTCTIME> and B<ASN1_GENERALIZEDTIME> act only on that
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specific time format. The functions starting with B<ASN1_TIME> will operate on
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either format.
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Users familiar with RFC822 should note that when specifying the flag
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B<ASN1_DTFLGS_RFC822> the year will be formatted as documented above,
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i.e., using 4 digits, not 2 as specified in RFC822.
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=head1 BUGS
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ASN1_TIME_print(), ASN1_UTCTIME_print() and ASN1_GENERALIZEDTIME_print() do
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not print out the timezone: it either prints out "GMT" or nothing. But all
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certificates complying with RFC5280 et al use GMT anyway.
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ASN1_TIME_print(), ASN1_TIME_print_ex(), ASN1_UTCTIME_print() and
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ASN1_GENERALIZEDTIME_print() do not distinguish if they fail because
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of an I/O error or invalid time format.
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Use the ASN1_TIME_normalize() function to normalize the time value before
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printing to get GMT results.
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=head1 RETURN VALUES
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ASN1_TIME_set(), ASN1_UTCTIME_set(), ASN1_GENERALIZEDTIME_set(),
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ASN1_TIME_adj(), ASN1_UTCTIME_adj() and ASN1_GENERALIZEDTIME_set() return
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a pointer to a time structure or NULL if an error occurred.
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ASN1_TIME_set_string(), ASN1_UTCTIME_set_string(),
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ASN1_GENERALIZEDTIME_set_string() and ASN1_TIME_set_string_X509() return
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1 if the time value is successfully set and 0 otherwise.
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ASN1_TIME_normalize() returns 1 on success, and 0 on error.
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ASN1_TIME_check(), ASN1_UTCTIME_check and ASN1_GENERALIZEDTIME_check() return 1
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if the structure is syntactically correct and 0 otherwise.
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ASN1_TIME_print(), ASN1_UTCTIME_print() and ASN1_GENERALIZEDTIME_print()
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return 1 if the time is successfully printed out and
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0 if an I/O error occurred an error occurred (I/O error or invalid time format).
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ASN1_TIME_to_tm() returns 1 if the time is successfully parsed and 0 if an
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error occurred (invalid time format).
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ASN1_TIME_diff() returns 1 for success and 0 for failure. It can fail if the
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passed-in time structure has invalid syntax, for example.
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ASN1_TIME_cmp_time_t() and ASN1_UTCTIME_cmp_time_t() return -1 if I<s> is
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before I<t>, 0 if I<s> equals I<t>, or 1 if I<s> is after I<t>. -2 is returned
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on error.
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ASN1_TIME_compare() returns -1 if I<a> is before I<b>, 0 if I<a> equals I<b>,
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or 1 if I<a> is after I<b>. -2 is returned on error.
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ASN1_TIME_to_generalizedtime() returns a pointer to the appropriate time
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structure on success or NULL if an error occurred.
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ASN1_TIME_dup(), ASN1_UTCTIME_dup() and ASN1_GENERALIZEDTIME_dup() return a
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pointer to a time structure or NULL if an error occurred.
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=head1 EXAMPLES
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Set a time structure to one hour after the current time and print it out:
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#include <time.h>
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#include <openssl/asn1.h>
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ASN1_TIME *tm;
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time_t t;
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BIO *b;
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t = time(NULL);
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tm = ASN1_TIME_adj(NULL, t, 0, 60 * 60);
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b = BIO_new_fp(stdout, BIO_NOCLOSE);
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ASN1_TIME_print(b, tm);
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ASN1_STRING_free(tm);
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BIO_free(b);
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Determine if one time is later or sooner than the current time:
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int day, sec;
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if (!ASN1_TIME_diff(&day, &sec, NULL, to))
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/* Invalid time format */
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if (day > 0 || sec > 0)
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printf("Later\n");
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else if (day < 0 || sec < 0)
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printf("Sooner\n");
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else
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printf("Same\n");
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=head1 HISTORY
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The ASN1_TIME_to_tm() function was added in OpenSSL 1.1.1.
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The ASN1_TIME_set_string_X509() function was added in OpenSSL 1.1.1.
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The ASN1_TIME_normalize() function was added in OpenSSL 1.1.1.
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The ASN1_TIME_cmp_time_t() function was added in OpenSSL 1.1.1.
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The ASN1_TIME_compare() function was added in OpenSSL 1.1.1.
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=head1 COPYRIGHT
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Copyright 2015-2025 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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