asn1\_get\_object\_id\_der(3) libtasn1 asn1\_get\_object\_id\_der(3)

# [NAME](#NAME)

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

# [SYNOPSIS](#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](#ARGUMENTS)

[const unsigned char * der](#const)

DER data to decode containing the OBJECT IDENTIFIER

[int der\_len](#int)

Length of DER data to decode.

[int * ret\_len](#int~2)

Output variable containing the length of the DER data.

[char * str](#char)

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

[int str\_size](#int~3)

Length of pre-allocated output buffer.

# [DESCRIPTION](#DESCRIPTION)

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

# [RETURNS](#RETURNS)

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

# [COPYRIGHT](#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](#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/**

4.21.0 libtasn1

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Document: asn1_get_object_id_der(3) from libtasn1 4.21.0-r9 (Chainguard OS)
Source: https://gitlab.com/gnutls/libtasn1