.\" $OpenBSD: OBJ_create.3,v 1.8 2023/09/06 12:26:59 schwarze Exp $ .\" full merge up to: .\" OpenSSL OBJ_nid2obj.pod 9b86974e Aug 17 15:21:33 2015 -0400 .\" selective merge up to: .\" OpenSSL OBJ_nid2obj.pod 0c5bc96f Mar 15 13:57:22 2022 +0000 .\" .\" This file is a derived work. .\" The changes are covered by the following Copyright and license: .\" .\" Copyright (c) 2017, 2021, 2023 Ingo Schwarze .\" .\" 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. 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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: September 6 2023 $ .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_defer , .Nm OBJ_cleanup , .Nm check_defer .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" .Vt extern int obj_cleanup_defer ; .Ft void .Fn OBJ_cleanup void .Ft void .Fn check_defer "int nid" .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 The global variable .Va obj_cleanup_defer controls the behaviour of .Fn OBJ_cleanup and .Xr EVP_cleanup 3 . .Pp If .Va obj_cleanup_defer has the default value of 0, .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 . Otherwise, .Fn OBJ_cleanup only sets .Va obj_cleanup_defer to 2, which defers the cleanup of the internal object table to the next call of .Xr EVP_cleanup 3 . .Pp By default, .Xr EVP_cleanup 3 has no effect on the internal object table. Only if .Va obj_cleanup_defer is 2, it resets .Va obj_cleanup_defer to 0 and calls .Fn OBJ_cleanup , which then resets the table to its default state. .Pp The function .Fn check_defer sets .Va obj_cleanup_defer to 1 unless .Fa nid is a built-in numeric identifier, but it has no effect if .Va obj_cleanup_defer already differs from 0. This function is called internally by various functions in the EVP library, in particular by subroutines of .Xr OpenSSL_add_all_ciphers 3 and .Xr OpenSSL_add_all_digests 3 . .Pp To reliably reset the internal object table no matter what the current state may be, an application program needs to call both .Fn OBJ_cleanup and .Xr EVP_cleanup 3 , in this order. The opposite order will usually not work. .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 EVP_cleanup 3 , .Xr OBJ_NAME_add 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 . .Pp .Va obj_cleanup_defer and .Fn check_defer first appeared in OpenSSL 1.0.0 and have been available since .Ox 4.9 . .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.