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-.\" $OpenBSD: ASN1_item_new.3,v 1.11 2022/01/12 17:54:51 tb Exp $
-.\"
-.\" Copyright (c) 2016, 2018 Ingo Schwarze <schwarze@openbsd.org>
-.\"
-.\" Permission to use, copy, modify, and distribute this software for any
-.\" purpose with or without fee is hereby granted, provided that the above
-.\" copyright notice and this permission notice appear in all copies.
-.\"
-.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-.\"
-.Dd $Mdocdate: January 12 2022 $
-.Dt ASN1_ITEM_NEW 3
-.Os
-.Sh NAME
-.Nm ASN1_item_new ,
-.Nm ASN1_item_free
-.Nd generic ASN.1 value constructor and destructor
-.Sh SYNOPSIS
-.In openssl/asn1.h
-.Ft ASN1_VALUE *
-.Fo ASN1_item_new
-.Fa "const ASN1_ITEM *it"
-.Fc
-.Ft void
-.Fo ASN1_item_free
-.Fa "ASN1_VALUE *val_in"
-.Fa "const ASN1_ITEM *it"
-.Fc
-.Sh DESCRIPTION
-.Fn ASN1_item_new
-allocates and initializes an empty ASN.1 value
-of the type described by the global static object
-.Fa it .
-.Pp
-If the item type described by
-.Fa it
-is reference counted,
-.Fn ASN1_item_free
-decrements the reference count of
-.Fa val_in .
-Otherwise, or if the reference count reaches 0,
-.Fn ASN1_item_free
-frees
-.Fa val_in ,
-assuming that it is of the type described by
-.Fa it .
-If the true type of
-.Fa val_in
-fails to match the specified
-.Fa it ,
-buffer overflows and segmentation faults are likely to occur.
-It is not possible to recover the type of an
-.Vt ASN1_VALUE
-object by inspecting it; the type always needs to be remembered
-separately.
-.Pp
-.Vt ASN1_VALUE
-is an incomplete type, and pointers to it always require casting
-to the correct complete type before they can be dereferenced.
-For all practical purposes, a pointer to
-.Vt ASN1_VALUE
-is equivalent to a
-.Vt void
-pointer.
-.Pp
-Depending on
-.Fa it ,
-there are more than 150 different types that
-.Fn ASN1_item_new
-may return.
-Most of them are pointers to structures or pointers to arrays of
-structures, but there are a few exceptions, for example:
-If
-.Fa it
-is
-.Dv ASN1_NULL_it ,
-.Fn ASN1_item_new
-returns a specific invalid pointer representing the unique
-.Vt ASN1_NULL
-object.
-If
-.Fa it
-is
-.Dv LONG_it ,
-.Fn ASN1_item_new
-does not return a pointer at all, but a
-.Vt long
-value cast to
-.Vt ASN1_VALUE * .
-.Sh RETURN VALUES
-The
-.Fn ASN1_item_new
-function returns the new
-.Vt ASN1_VALUE
-object if successful; otherwise
-.Dv NULL
-is returned and an error code can be retrieved with
-.Xr ERR_get_error 3 .
-.Sh SEE ALSO
-.Xr ASN1_get_object 3 ,
-.Xr ASN1_item_d2i 3 ,
-.Xr ASN1_item_digest 3 ,
-.Xr ASN1_item_pack 3 ,
-.Xr ASN1_item_sign 3 ,
-.Xr ASN1_item_verify 3 ,
-.Xr ASN1_NULL_new 3 ,
-.Xr ASN1_TYPE_new 3 ,
-.Xr d2i_ASN1_NULL 3 ,
-.Xr OBJ_nid2obj 3
-.Sh HISTORY
-.Fn ASN1_item_new
-and
-.Fn ASN1_item_free
-first appeared in OpenSSL 0.9.7 and have been available since
-.Ox 3.2 .
-.Sh BUGS
-The
-.Vt ASN1_VALUE
-type compromises type safety and invites programming mistakes that
-will typically have severe consequences.