1.\" $OpenBSD: d2i_ASN1_OBJECT.3,v 1.9 2018/04/25 15:17:52 schwarze Exp $ 2.\" OpenSSL 05ea606a May 20 20:52:46 2016 -0400 3.\" 4.\" Copyright (c) 2017 Ingo Schwarze <schwarze@openbsd.org> 5.\" 6.\" Permission to use, copy, modify, and distribute this software for any 7.\" purpose with or without fee is hereby granted, provided that the above 8.\" copyright notice and this permission notice appear in all copies. 9.\" 10.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17.\" 18.Dd $Mdocdate: April 25 2018 $ 19.Dt D2I_ASN1_OBJECT 3 20.Os 21.Sh NAME 22.Nm d2i_ASN1_OBJECT , 23.Nm i2d_ASN1_OBJECT 24.Nd decode and encode ASN.1 object identifiers 25.Sh SYNOPSIS 26.In openssl/asn1.h 27.Ft ASN1_OBJECT * 28.Fo d2i_ASN1_OBJECT 29.Fa "ASN1_OBJECT **val_out" 30.Fa "unsigned char **der_in" 31.Fa "long length" 32.Fc 33.Ft int 34.Fo i2d_ASN1_OBJECT 35.Fa "const ASN1_OBJECT *val_in" 36.Fa "unsigned char **der_out" 37.Fc 38.Sh DESCRIPTION 39These functions decode and encode ASN.1 object identifiers. 40For details about the semantics, examples, caveats, and bugs, see 41.Xr ASN1_item_d2i 3 . 42.Pp 43The objects returned from 44.Fn d2i_ASN1_OBJECT 45and the data contained in them are always marked as dynamically 46allocated, so when they are no longer needed, 47.Xr ASN1_OBJECT_free 3 48can be called on them. 49.Pp 50If reusing an existing object is attempted but the 51.Pf * Fa val_out 52passed in points to an object that is not marked as dynamically 53allocated, then the existing object is left untouched and 54.Fn d2i_ASN1_OBJECT 55behaves as if 56.Pf * Fa val_out 57would have been 58.Dv NULL : 59A new object is allocated and a pointer to it is both stored in 60.Pf * Fa val_out 61and returned. 62.Sh RETURN VALUES 63.Fn d2i_ASN1_OBJECT 64returns an 65.Vt ASN1_OBJECT 66object or 67.Dv NULL 68if an error occurs. 69.Pp 70.Fn i2d_ASN1_OBJECT 71returns the number of bytes successfully encoded 72or a value <= 0 if an error occurs. 73.Sh SEE ALSO 74.Xr ASN1_item_d2i 3 , 75.Xr ASN1_OBJECT_new 3 , 76.Xr OBJ_nid2obj 3 77.Sh HISTORY 78.Fn d2i_ASN1_OBJECT 79and 80.Fn i2d_ASN1_OBJECT 81first appeared in SSLeay 0.5.1 and have been available since 82.Ox 2.4 . 83.Sh CAVEATS 84.Fn d2i_ASN1_OBJECT 85never sets the long and short names of the object, not even if the 86object identifier matches one that is built into the library. 87To find the names of an object identifier parsed from DER or BER 88input, call 89.Xr OBJ_obj2nid 3 90on the returned object, and then 91.Xr OBJ_nid2sn 3 92and 93.Xr OBJ_nid2ln 3 94on the result. 95.Sh BUGS 96When reusing a dynamically allocated object that contains dynamically 97allocated names, the old names are not freed and the memory containing 98them is leaked. 99