.\"	$OpenBSD: X509_EXTENSION_set_object.3,v 1.1 2016/12/04 20:51:47 schwarze Exp $
.\"	OpenSSL bb9ad09e Jun 6 00:43:05 2016 -0400
.\"
.\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
.\" Copyright (c) 2015 The OpenSSL Project.  All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\"
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\"
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in
.\"    the documentation and/or other materials provided with the
.\"    distribution.
.\"
.\" 3. All advertising materials mentioning features or use of this
.\"    software must display the following acknowledgment:
.\"    "This product includes software developed by the OpenSSL Project
.\"    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
.\"
.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
.\"    endorse or promote products derived from this software without
.\"    prior written permission. For written permission, please contact
.\"    openssl-core@openssl.org.
.\"
.\" 5. Products derived from this software may not be called "OpenSSL"
.\"    nor may "OpenSSL" appear in their names without prior written
.\"    permission of the OpenSSL Project.
.\"
.\" 6. Redistributions of any form whatsoever must retain the following
.\"    acknowledgment:
.\"    "This product includes software developed by the OpenSSL Project
.\"    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
.\" OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd $Mdocdate: December 4 2016 $
.Dt X509_EXTENSION_SET_OBJECT 3
.Os
.Sh NAME
.Nm X509_EXTENSION_set_object ,
.Nm X509_EXTENSION_set_critical ,
.Nm X509_EXTENSION_set_data ,
.Nm X509_EXTENSION_create_by_NID ,
.Nm X509_EXTENSION_create_by_OBJ ,
.Nm X509_EXTENSION_get_object ,
.Nm X509_EXTENSION_get_critical ,
.Nm X509_EXTENSION_get_data
.Nd extension utility functions
.Sh SYNOPSIS
.Ft int
.Fo X509_EXTENSION_set_object
.Fa "X509_EXTENSION *ex"
.Fa "ASN1_OBJECT *obj"
.Fc
.Ft int
.Fo X509_EXTENSION_set_critical
.Fa "X509_EXTENSION *ex"
.Fa "int crit"
.Fc
.Ft int
.Fo X509_EXTENSION_set_data
.Fa "X509_EXTENSION *ex"
.Fa "ASN1_OCTET_STRING *data"
.Fc
.Ft X509_EXTENSION *
.Fo X509_EXTENSION_create_by_NID
.Fa "X509_EXTENSION **ex"
.Fa "int nid"
.Fa "int crit"
.Fa "ASN1_OCTET_STRING *data"
.Fc
.Ft X509_EXTENSION *
.Fo X509_EXTENSION_create_by_OBJ
.Fa "X509_EXTENSION **ex"
.Fa "ASN1_OBJECT *obj"
.Fa "int crit"
.Fa "ASN1_OCTET_STRING *data"
.Fc
.Ft ASN1_OBJECT *
.Fo X509_EXTENSION_get_object
.Fa "X509_EXTENSION *ex"
.Fc
.Ft int
.Fo X509_EXTENSION_get_critical
.Fa "X509_EXTENSION *ex"
.Fc
.Ft ASN1_OCTET_STRING *
.Fo X509_EXTENSION_get_data
.Fa "X509_EXTENSION *ne"
.Fc
.Sh DESCRIPTION
.Fn X509_EXTENSION_set_object
sets the extension type of
.Fa ex
to
.Fa obj .
The
.Fa obj
pointer is duplicated internally so
.Fa obj
should be freed up after use.
.Pp
.Fn X509_EXTENSION_set_critical
sets the criticality of
.Fa ex
to
.Fa crit .
If
.Fa crit
is zero, the extension in non-critical, otherwise it is critical.
.Pp
.Fn X509_EXTENSION_set_data
sets the data in extension
.Fa ex
to
.Fa data .
The
.Fa data
pointer is duplicated internally.
.Pp
.Fn X509_EXTENSION_create_by_NID
creates an extension of type
.Fa nid ,
criticality
.Fa crit
using data
.Fa data .
The created extension is returned and written to
.Pf * Fa ex
reusing or allocating a new extension if necessary, so
.Pf * Fa ex
should either be
.Dv NULL
or a valid
.Vt X509_EXTENSION
structure.
It must not be an uninitialised pointer.
.Pp
.Fn X509_EXTENSION_create_by_OBJ
is identical to
.Fn X509_EXTENSION_create_by_NID
except that it creates an extension using
.Fa obj
instead of a NID.
.Pp
.Fn X509_EXTENSION_get_object
returns the extension type of
.Fa ex
as an
.Vt ASN1_OBJECT
pointer.
The returned pointer is an internal value which must not be freed up.
.Pp
.Fn X509_EXTENSION_get_critical
returns the criticality of extension
.Fa ex
it returns 1 for critical and 0 for non-critical.
.Pp
.Fn X509_EXTENSION_get_data
returns the data of extension
.Fa ex .
The returned pointer is an internal value which must not be freed up.
.Pp
These functions manipulate the contents of an extension directly.
Most applications will want to parse or encode and add an extension:
they should use the extension encode and decode functions instead
such as
.Xr X509_add1_ext_i2d 3
and
.Xr X509_get_ext_d2i 3 .
.Pp
The
.Fa data
associated with an extension is the extension encoding in an
.Vt ASN1_OCTET_STRING
structure.
.Sh RETURN VALUES
.Fn X509_EXTENSION_set_object ,
.Fn X509_EXTENSION_set_critical ,
and
.Fn X509_EXTENSION_set_data
return 1 for success or 0 for failure.
.Pp
.Fn X509_EXTENSION_create_by_NID
and
.Fn X509_EXTENSION_create_by_OBJ
return an
.Vt X509_EXTENSION
pointer or
.Dv NULL
if an error occurs.
.Pp
.Fn X509_EXTENSION_get_object
returns an
.Vt ASN1_OBJECT
pointer.
.Pp
.Fn X509_EXTENSION_get_critical
returns 0 for non-critical or 1 for critical.
.Pp
.Fn X509_EXTENSION_get_data
returns an
.Vt ASN1_OCTET_STRING
pointer.
.Sh SEE ALSO
.Xr X509V3_get_d2i 3