1.\" $OpenBSD: a2d_ASN1_OBJECT.3,v 1.3 2023/08/09 17:34:39 schwarze Exp $ 2.\" 3.\" Copyright (c) 2021 Ingo Schwarze <schwarze@openbsd.org> 4.\" 5.\" Permission to use, copy, modify, and distribute this software for any 6.\" purpose with or without fee is hereby granted, provided that the above 7.\" copyright notice and this permission notice appear in all copies. 8.\" 9.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16.\" 17.Dd $Mdocdate: August 9 2023 $ 18.Dt A2D_ASN1_OBJECT 3 19.Os 20.Sh NAME 21.Nm a2d_ASN1_OBJECT 22.Nd DER content octets of an ASN.1 object identifier 23.Sh SYNOPSIS 24.In openssl/asn1.h 25.Ft int 26.Fo a2d_ASN1_OBJECT 27.Fa "unsigned char *der_out" 28.Fa "int olen" 29.Fa "const char *val_in" 30.Fa "int ilen" 31.Fc 32.Sh DESCRIPTION 33.Fn a2d_ASN1_OBJECT 34accepts an ASCII string 35.Fa val_in 36of 37.Fa ilen 38bytes and interprets it as the numerical form of an ASN.1 object identifier. 39It writes the content octets of the DER encoding of the object identifier 40to the buffer 41.Fa der_out 42which is 43.Fa olen 44bytes long. 45The identifier and length octets of the DER encoding are not written. 46.Pp 47If 48.Fa ilen 49is \-1, the 50.Xr strlen 3 51of 52.Fa val_in 53is used instead. 54.Pp 55If 56.Fa der_out 57is a 58.Dv NULL 59pointer, writing the content octets is skipped 60and only the return value is calculated. 61.Sh RETURN VALUES 62.Fn a2d_ASN1_OBJECT 63returns the number of content octets that were or would be written or 0 if 64.Fa ilen 65is 0, if 66.Fa val_in 67is not a valid representation of an object identifier, 68if memory allocation fails, or if the number of content octets 69would be larger than 70.Fa olen . 71.Sh SEE ALSO 72.Xr ASN1_OBJECT_new 3 , 73.Xr i2d_ASN1_OBJECT 3 , 74.Xr OBJ_create 3 75.Sh STANDARDS 76ITU-T Recommendation X.690, also known as ISO/IEC 8825-1: 77Information technology - ASN.1 encoding rules: 78Specification of Basic Encoding Rules (BER), Canonical Encoding 79Rules (CER) and Distinguished Encoding Rules (DER), 80section 8.19: Encoding of an object identifier value 81.Sh HISTORY 82.Fn a2d_ASN1_OBJECT 83first appeared in SSLeay 0.8.0 and has been available since 84.Ox 2.4 . 85