.\" $OpenBSD: ASN1_time_parse.3,v 1.5 2017/05/06 18:07:46 jmc Exp $
.\"
.\" Copyright (c) 2016 Bob Beck <beck@openbsd.org>
.\"
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.Dd $Mdocdate: May 6 2017 $
.Dt ASN1_TIME_PARSE 3
.Os
.Sh NAME
.Nm ASN1_time_parse ,
.Nm ASN1_time_tm_cmp ,
.Nm ASN1_TIME_set_tm
.Nd LibreSSL utilities for ASN.1 time types
.Sh SYNOPSIS
.In openssl/asn1.h
.Ft int
.Fn ASN1_time_parse "const char *bytes" "size_t len" "struct tm *tm" "int mode"
.Ft int
.Fn ASN1_time_tm_cmp "struct tm *tm1" "struct tm *tm2"
.Ft ASN1_TIME *
.Fn ASN1_TIME_set_tm "ASN1_TIME *s" "struct tm *tm"
.Sh DESCRIPTION
The
.Fn ASN1_time_parse
function parses an ASN.1 time string of
.Ar len
bytes starting at
.Ar bytes .
The resulting time is stored in
.Ar tm
if
.Ar tm
is not
.Dv NULL .
.Pp
The
.Ar mode
parameter must be one of
.Bl -bullet -offset four
.It
0 to parse a time as specified in RFC 5280 for an X509 object,
which may be either a UTC time or a Generalized time.
.It
.Dv V_ASN1_UTCTIME
to parse an RFC 5280 format UTC time.
.It
.Dv V_ASN1_GENERALIZEDTIME
to parse an RFC 5280 format Generalized time.
.El
.Pp
The
.Fn ASN1_time_tm_cmp
function compares two times in
.Ar tm1
and
.Ar tm2 .
.Pp
The function
.Fn ASN1_TIME_set_tm
sets the
.Vt ASN1_TIME
structure
.Fa s
to the time represented by the
.Vt strict tm
value pointed to by
.Fa tm .
If
.Fa s
is
.Dv NULL ,
a new
.Vt ASN1_TIME
structure is allocated and returned.
.Sh RETURN VALUES
.Fn ASN1_parse_time
returns
.Bl -bullet -offset four
.It
-1 if the string was invalid for the
.Ar mode
specified.
.It
.Dv V_ASN1_UTCTIME
if the string parsed as a valid UTC time.
.It
.Dv V_ASN1_GENERALIZEDTIME
if the string parsed as a valid Generalized time.
.El
.Pp
.Fn ASN1_time_tm_cmp
returns
.Bl -bullet -offset four
.It
-1 if
.Ar tm1
is less than
.Ar tm2 .
.It
1 if
.Ar tm1
is greater than
.Ar tm2 .
.It
0 if
.Ar tm1
is the same as
.Ar tm2 .
.El
.Pp
.Fn ASN1_TIME_set_tm
returns a pointer to an
.Vt ASN1_TIME
structure or
.Dv NULL
if an error occurred.