path: root/lib/libcrypto/man/OBJ_create.3

.\" $OpenBSD: OBJ_create.3,v 1.10 2024/01/31 08:02:53 tb Exp $
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.Dd $Mdocdate: January 31 2024 $
.Dt OBJ_CREATE 3
.Os
.Sh NAME
.Nm OBJ_new_nid ,
.Nm OBJ_add_object ,
.Nm OBJ_create ,
.\" OBJ_create_and_add_object is a deprecated, unused alias for OBJ_create(3).
.Nm OBJ_create_objects ,
.Nm OBJ_cleanup
.Nd modify the table of ASN.1 object identifiers
.Sh SYNOPSIS
.In openssl/objects.h
.Ft int
.Fn OBJ_new_nid "int increment"
.Ft int
.Fn OBJ_add_object "const ASN1_OBJECT *object"
.Ft int
.Fo OBJ_create
.Fa "const char *oid"
.Fa "const char *sn"
.Fa "const char *ln"
.Fc
.Ft int
.Fn OBJ_create_objects "BIO *in_bio"
.Ft void
.Fn OBJ_cleanup void
.Sh DESCRIPTION
.Fn OBJ_new_nid
returns the smallest currently unassigned ASN.1 numeric
object identifier (NID) and reserves
.Fa increment
consecutive NIDs starting with it.
Passing an argument of 1 is usually recommended.
The return value can be assigned to a new object by passing it as the
.Fa nid
argument to
.Xr ASN1_OBJECT_create 3
and by passing the resulting object to
.Fn OBJ_add_object .
.Pp
.Fn OBJ_add_object
adds a copy of the
.Fa object
to the internal table of ASN.1 object identifiers for use by
.Xr OBJ_nid2obj 3
and related functions.
.Pp
.Fn OBJ_create
provides a simpler way to add a new object to the internal table.
.Fa oid
is the numerical form of the object,
.Fa sn
the short name and
.Fa ln
the long name.
A new NID is automatically assigned using
.Fn OBJ_new_nid .
.Pp
.Fn OBJ_create_objects
reads text lines of the form
.Pp
.D1 Fa oid sn ln
.Pp
from
.Fa in_bio
and calls
.Fn OBJ_create oid sn ln
for every line read.
The three fields of the input lines
are separated by one or more whitespace characters.
.Pp
For all three functions, the objects added to the internal table and
all the data contained in them is marked as not dynamically allocated.
Consequently, retrieving them with
.Xr OBJ_nid2obj 3
or a similar function and then calling
.Xr ASN1_OBJECT_free 3
on the returned pointer will have no effect.
.Pp
.Fn OBJ_cleanup
resets the internal object table to its default state,
removing and freeing all objects that were added with
.Fn OBJ_add_object ,
.Fn OBJ_create ,
or
.Fn OBJ_create_objects .
.Sh RETURN VALUES
.Fn OBJ_new_nid
returns the new NID.
.Pp
.Fn OBJ_add_object
returns the NID of the added
.Fa object
or
.Dv NID_undef
if no object was added because the
.Fa object
argument was
.Dv NULL ,
did not contain an NID, or memory allocation failed.
.Pp
.Fn OBJ_create
returns the new NID or
.Dv NID_undef
if
.Fa oid
is not a valid representation of an object identifier
or if memory allocation fails.
.Pp
.Fn OBJ_create_objects
returns the number of objects added.
.Pp
In some cases of failure of
.Fn OBJ_add_object ,
.Fn OBJ_create ,
and
.Fn OBJ_create_objects ,
the reason can be determined with
.Xr ERR_get_error 3 .
.Sh EXAMPLES
Create a new NID and initialize an object from it:
.Bd -literal -offset indent
int new_nid;
ASN1_OBJECT *obj;

new_nid = OBJ_create("1.2.3.4", "NewOID", "New Object Identifier");
obj = OBJ_nid2obj(new_nid);
.Ed
.Sh SEE ALSO
.Xr ASN1_OBJECT_new 3 ,
.Xr OBJ_nid2obj 3
.Sh HISTORY
.Fn OBJ_new_nid ,
.Fn OBJ_add_object ,
and
.Fn OBJ_cleanup
first appeared in SSLeay 0.8.0 and
.Fn OBJ_create
in SSLeay 0.9.0.
These functions have been available since
.Ox 2.4 .
.Sh CAVEATS
.Fn OBJ_add_object
indicates success even after adding an incomplete object that was created with
.Xr ASN1_OBJECT_create 3
but lacks a short name, a long name, or an OID.
.Pp
Even
.Fn OBJ_create
tolerates
.Dv NULL
pointers being passed for the
.Fa sn
and/or
.Fa ln
arguments, in which case
.Xr OBJ_nid2sn 3
and
.Xr OBJ_sn2nid 3
or
.Xr OBJ_nid2ln 3
and
.Xr OBJ_ln2nid 3
will not work on the added object, respectively.
.Sh BUGS
.Fn OBJ_new_nid
does not reserve any return value to indicate an error.
Consequently, to avoid conflicting NID assignments and integer overflows,
care must be taken to not pass negative, zero, or large arguments to
.Fn OBJ_new_nid .
.Pp
.Fn OBJ_create_objects
does not distinguish between end of file, I/O errors, temporary
unavailability of data on a non-blocking BIO, invalid input syntax,
and memory allocation failure.
In all these cases, reading is aborted and the number of objects
that were already added is returned.