---
name: "asn1_get_object_id_der"
section: "3"
platform: "linux"
package: "libtasn1"
version: "4.21.0-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/asn1_get_object_id_der"
---

# asn1\_get\_object\_id\_der(3)

API function

## NAME

asn1\_get\_object\_id\_der - API function

## SYNOPSIS

**#include \<libtasn1.h\>**

**int asn1\_get\_object\_id\_der(const unsigned char \*** *der***, int** *der\_len***, int \*** *ret\_len***, char \*** *str***, int** *str\_size***);**

## ARGUMENTS

- const unsigned char \* der

  DER data to decode containing the OBJECT IDENTIFIER

- int der\_len

  Length of DER data to decode.

- int \* ret\_len

  Output variable containing the length of the DER data.

- char \* str

  Pre-allocated output buffer to put the textual object id in.

- int str\_size

  Length of pre-allocated output buffer.

## DESCRIPTION

Converts a DER encoded object identifier to its textual form. This function expects the DER object identifier without the tag.

## RETURNS

**ASN1\_SUCCESS** on success, or an error.

## COPYRIGHT

Copyright © 2006-2025 Free Software Foundation, Inc..\
 Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.

## SEE ALSO

The full documentation for **libtasn1** is maintained as a Texinfo manual.  If the **info** and **libtasn1** programs are properly installed at your site, the command

-

  **info libtasn1**

should give you access to the complete manual. As an alternative you may obtain the manual from:

-

  **https://www.gnu.org/software/libtasn1/manual/**