399 lines
17 KiB
Groff
Executable File
399 lines
17 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "ASN1_TIME_SET 3"
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.TH ASN1_TIME_SET 3 "2020-03-02" "3.0.0-dev" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "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_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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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 4
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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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\&
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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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\&
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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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\&
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\& int ASN1_TIME_normalize(ASN1_TIME *s);
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\&
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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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\&
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\& int ASN1_TIME_print(BIO *b, const ASN1_TIME *s);
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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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\&
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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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\&
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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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\&
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\& int ASN1_TIME_compare(const ASN1_TIME *a, const ASN1_TIME *b);
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\&
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\& ASN1_GENERALIZEDTIME *ASN1_TIME_to_generalizedtime(ASN1_TIME *t,
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\& ASN1_GENERALIZEDTIME **out);
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\&
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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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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \fIASN1_TIME_set()\fR, \fIASN1_UTCTIME_set()\fR and \fIASN1_GENERALIZEDTIME_set()\fR
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functions set the structure \fIs\fR to the time represented by the time_t
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value \fIt\fR. If \fIs\fR is \s-1NULL\s0 a new time structure is allocated and returned.
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.PP
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The \fIASN1_TIME_adj()\fR, \fIASN1_UTCTIME_adj()\fR and \fIASN1_GENERALIZEDTIME_adj()\fR
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functions set the time structure \fIs\fR to the time represented
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by the time \fIoffset_day\fR and \fIoffset_sec\fR after the time_t value \fIt\fR.
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The values of \fIoffset_day\fR or \fIoffset_sec\fR can be negative to set a
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time before \fIt\fR. The \fIoffset_sec\fR value can also exceed the number of
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seconds in a day. If \fIs\fR is \s-1NULL\s0 a new structure is allocated
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and returned.
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.PP
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The \fIASN1_TIME_set_string()\fR, \fIASN1_UTCTIME_set_string()\fR and
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\&\fIASN1_GENERALIZEDTIME_set_string()\fR functions set the time structure \fIs\fR
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to the time represented by string \fIstr\fR which must be in appropriate \s-1ASN\s0.1
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time format (for example \s-1YYMMDDHHMMSSZ\s0 or \s-1YYYYMMDDHHMMSSZ\s0). If \fIs\fR is \s-1NULL\s0
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this function performs a format check on \fIstr\fR only. The string \fIstr\fR
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is copied into \fIs\fR.
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.PP
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\&\fIASN1_TIME_set_string_X509()\fR sets \fB\s-1ASN1_TIME\s0\fR structure \fIs\fR to the time
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represented by string \fIstr\fR which must be in appropriate time format
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that \s-1RFC\s0 5280 requires, which means it only allows \s-1YYMMDDHHMMSSZ\s0 and
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\&\s-1YYYYMMDDHHMMSSZ\s0 (leap second is rejected), all other \s-1ASN\s0.1 time format
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are not allowed. If \fIs\fR is \s-1NULL\s0 this function performs a format check
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on \fIstr\fR only.
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.PP
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The \fIASN1_TIME_normalize()\fR function converts an \fB\s-1ASN1_GENERALIZEDTIME\s0\fR or
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\&\fB\s-1ASN1_UTCTIME\s0\fR into a time value that can be used in a certificate. It
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should be used after the \fIASN1_TIME_set_string()\fR functions and before
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\&\fIASN1_TIME_print()\fR functions to get consistent (i.e. \s-1GMT\s0) results.
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.PP
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The \fIASN1_TIME_check()\fR, \fIASN1_UTCTIME_check()\fR and \fIASN1_GENERALIZEDTIME_check()\fR
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functions check the syntax of the time structure \fIs\fR.
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.PP
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The \fIASN1_TIME_print()\fR, \fIASN1_UTCTIME_print()\fR and \fIASN1_GENERALIZEDTIME_print()\fR
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functions print the time structure \fIs\fR to \s-1BIO\s0 \fIb\fR in human readable
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format. It will be of the format \s-1MMM\s0 \s-1DD\s0 \s-1HH:MM:SS\s0 \s-1YYYY\s0 [\s-1GMT\s0], for example
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\&\*(L"Feb 3 00:55:52 2015 \s-1GMT\s0\*(R" it does not include a newline. If the time
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structure has invalid format it prints out \*(L"Bad time value\*(R" and returns
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an error. The output for generalized time may include a fractional part
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following the second.
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.PP
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\&\fIASN1_TIME_to_tm()\fR converts the time \fIs\fR to the standard \fItm\fR structure.
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If \fIs\fR is \s-1NULL\s0, then the current time is converted. The output time is \s-1GMT\s0.
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The \fItm_sec\fR, \fItm_min\fR, \fItm_hour\fR, \fItm_mday\fR, \fItm_wday\fR, \fItm_yday\fR,
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\&\fItm_mon\fR and \fItm_year\fR fields of \fItm\fR structure are set to proper values,
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whereas all other fields are set to 0. If \fItm\fR is \s-1NULL\s0 this function performs
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a format check on \fIs\fR only. If \fIs\fR is in Generalized format with fractional
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seconds, e.g. \s-1YYYYMMDDHHMMSS\s0.SSSZ, the fractional seconds will be lost while
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converting \fIs\fR to \fItm\fR structure.
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.PP
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\&\fIASN1_TIME_diff()\fR sets \fI*pday\fR and \fI*psec\fR to the time difference between
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\&\fIfrom\fR and \fIto\fR. If \fIto\fR represents a time later than \fIfrom\fR then
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one or both (depending on the time difference) of \fI*pday\fR and \fI*psec\fR
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will be positive. If \fIto\fR represents a time earlier than \fIfrom\fR then
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one or both of \fI*pday\fR and \fI*psec\fR will be negative. If \fIto\fR and \fIfrom\fR
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represent the same time then \fI*pday\fR and \fI*psec\fR will both be zero.
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If both \fI*pday\fR and \fI*psec\fR are nonzero they will always have the same
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sign. The value of \fI*psec\fR will always be less than the number of seconds
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in a day. If \fIfrom\fR or \fIto\fR is \s-1NULL\s0 the current time is used.
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.PP
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The \fIASN1_TIME_cmp_time_t()\fR and \fIASN1_UTCTIME_cmp_time_t()\fR functions compare
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the two times represented by the time structure \fIs\fR and the time_t \fIt\fR.
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.PP
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The \fIASN1_TIME_compare()\fR function compares the two times represented by the
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time structures \fIa\fR and \fIb\fR.
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.PP
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The \fIASN1_TIME_to_generalizedtime()\fR function converts an \fB\s-1ASN1_TIME\s0\fR to an
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\&\fB\s-1ASN1_GENERALIZEDTIME\s0\fR, regardless of year. If either \fIout\fR or
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\&\fI*out\fR are \s-1NULL\s0, then a new object is allocated and must be freed after use.
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.PP
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The \fIASN1_TIME_dup()\fR, \fIASN1_UTCTIME_dup()\fR and \fIASN1_GENERALIZEDTIME_dup()\fR functions
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duplicate the time structure \fIt\fR and return the duplicated result
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correspondingly.
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.SH "NOTES"
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.IX Header "NOTES"
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The \fB\s-1ASN1_TIME\s0\fR structure corresponds to the \s-1ASN\s0.1 structure \fBTime\fR
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defined in \s-1RFC5280\s0 et al. The time setting functions obey the rules outlined
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in \s-1RFC5280:\s0 if the date can be represented by UTCTime it is used, else
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GeneralizedTime is used.
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.PP
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The \fB\s-1ASN1_TIME\s0\fR, \fB\s-1ASN1_UTCTIME\s0\fR and \fB\s-1ASN1_GENERALIZEDTIME\s0\fR structures are
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represented as an \fB\s-1ASN1_STRING\s0\fR internally and can be freed up using
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\&\fIASN1_STRING_free()\fR.
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.PP
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The \fB\s-1ASN1_TIME\s0\fR 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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.PP
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\&\fB\s-1ASN1_UTCTIME\s0\fR is limited to a year range of 1950 through 2049.
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.PP
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Some applications add offset times directly to a time_t value and pass the
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results to \fIASN1_TIME_set()\fR (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 \fIASN1_TIME_adj()\fR instead and pass the offset value
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in the \fIoffset_sec\fR and \fIoffset_day\fR parameters instead of directly
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manipulating a time_t value.
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.PP
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\&\fIASN1_TIME_adj()\fR may change the type from \fB\s-1ASN1_GENERALIZEDTIME\s0\fR to
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\&\fB\s-1ASN1_UTCTIME\s0\fR, or vice versa, based on the resulting year.
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\&\fIASN1_GENERALIZEDTIME_adj()\fR and \fIASN1_UTCTIME_adj()\fR will not modify the type
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of the return structure.
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.PP
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It is recommended that functions starting with \fB\s-1ASN1_TIME\s0\fR be used instead of
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those starting with \fB\s-1ASN1_UTCTIME\s0\fR or \fB\s-1ASN1_GENERALIZEDTIME\s0\fR. The functions
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starting with \fB\s-1ASN1_UTCTIME\s0\fR and \fB\s-1ASN1_GENERALIZEDTIME\s0\fR act only on that
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specific time format. The functions starting with \fB\s-1ASN1_TIME\s0\fR will operate on
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either format.
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.SH "BUGS"
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.IX Header "BUGS"
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\&\fIASN1_TIME_print()\fR, \fIASN1_UTCTIME_print()\fR and \fIASN1_GENERALIZEDTIME_print()\fR
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do not print out the timezone: it either prints out \*(L"\s-1GMT\s0\*(R" or nothing. But all
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certificates complying with \s-1RFC5280\s0 et al use \s-1GMT\s0 anyway.
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.PP
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Use the \fIASN1_TIME_normalize()\fR function to normalize the time value before
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printing to get \s-1GMT\s0 results.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIASN1_TIME_set()\fR, \fIASN1_UTCTIME_set()\fR, \fIASN1_GENERALIZEDTIME_set()\fR,
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\&\fIASN1_TIME_adj()\fR, \fIASN1_UTCTIME_adj()\fR and \fIASN1_GENERALIZEDTIME_set()\fR return
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a pointer to a time structure or \s-1NULL\s0 if an error occurred.
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.PP
|
|
\&\fIASN1_TIME_set_string()\fR, \fIASN1_UTCTIME_set_string()\fR,
|
|
\&\fIASN1_GENERALIZEDTIME_set_string()\fR and \fIASN1_TIME_set_string_X509()\fR return
|
|
1 if the time value is successfully set and 0 otherwise.
|
|
.PP
|
|
\&\fIASN1_TIME_normalize()\fR returns 1 on success, and 0 on error.
|
|
.PP
|
|
\&\fIASN1_TIME_check()\fR, ASN1_UTCTIME_check and \fIASN1_GENERALIZEDTIME_check()\fR return 1
|
|
if the structure is syntactically correct and 0 otherwise.
|
|
.PP
|
|
\&\fIASN1_TIME_print()\fR, \fIASN1_UTCTIME_print()\fR and \fIASN1_GENERALIZEDTIME_print()\fR return
|
|
1 if the time is successfully printed out and 0 if an error occurred (I/O error
|
|
or invalid time format).
|
|
.PP
|
|
\&\fIASN1_TIME_to_tm()\fR returns 1 if the time is successfully parsed and 0 if an
|
|
error occurred (invalid time format).
|
|
.PP
|
|
\&\fIASN1_TIME_diff()\fR returns 1 for success and 0 for failure. It can fail if the
|
|
passed-in time structure has invalid syntax, for example.
|
|
.PP
|
|
\&\fIASN1_TIME_cmp_time_t()\fR and \fIASN1_UTCTIME_cmp_time_t()\fR return \-1 if \fIs\fR is
|
|
before \fIt\fR, 0 if \fIs\fR equals \fIt\fR, or 1 if \fIs\fR is after \fIt\fR. \-2 is returned
|
|
on error.
|
|
.PP
|
|
\&\fIASN1_TIME_compare()\fR returns \-1 if \fIa\fR is before \fIb\fR, 0 if \fIa\fR equals \fIb\fR,
|
|
or 1 if \fIa\fR is after \fIb\fR. \-2 is returned on error.
|
|
.PP
|
|
\&\fIASN1_TIME_to_generalizedtime()\fR returns a pointer to the appropriate time
|
|
structure on success or \s-1NULL\s0 if an error occurred.
|
|
.PP
|
|
\&\fIASN1_TIME_dup()\fR, \fIASN1_UTCTIME_dup()\fR and \fIASN1_GENERALIZEDTIME_dup()\fR return a
|
|
pointer to a time structure or \s-1NULL\s0 if an error occurred.
|
|
.SH "EXAMPLES"
|
|
.IX Header "EXAMPLES"
|
|
Set a time structure to one hour after the current time and print it out:
|
|
.PP
|
|
.Vb 2
|
|
\& #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);
|
|
.Ve
|
|
.PP
|
|
Determine if one time is later or sooner than the current time:
|
|
.PP
|
|
.Vb 1
|
|
\& int day, sec;
|
|
\&
|
|
\& if (!ASN1_TIME_diff(&day, &sec, NULL, to))
|
|
\& /* Invalid time format */
|
|
\&
|
|
\& if (day > 0 || sec > 0)
|
|
\& printf("Later\en");
|
|
\& else if (day < 0 || sec < 0)
|
|
\& printf("Sooner\en");
|
|
\& else
|
|
\& printf("Same\en");
|
|
.Ve
|
|
.SH "HISTORY"
|
|
.IX Header "HISTORY"
|
|
The \fIASN1_TIME_to_tm()\fR function was added in OpenSSL 1.1.1.
|
|
The \fIASN1_TIME_set_string_X509()\fR function was added in OpenSSL 1.1.1.
|
|
The \fIASN1_TIME_normalize()\fR function was added in OpenSSL 1.1.1.
|
|
The \fIASN1_TIME_cmp_time_t()\fR function was added in OpenSSL 1.1.1.
|
|
The \fIASN1_TIME_compare()\fR function was added in OpenSSL 1.1.1.
|
|
.SH "COPYRIGHT"
|
|
.IX Header "COPYRIGHT"
|
|
Copyright 2015\-2018 The OpenSSL Project Authors. All Rights Reserved.
|
|
.PP
|
|
Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file \s-1LICENSE\s0 in the source distribution or at
|
|
<https://www.openssl.org/source/license.html>.
|