---
name: "asn1_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_object_id_der"
---

# asn1\_object\_id\_der(3)

API function

## NAME

asn1\_object\_id\_der - API function

## SYNOPSIS

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

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

## ARGUMENTS

- const char \* str

  An object identifier in numeric, dot format.

- unsigned char \* der

  buffer to hold the returned encoding (may be **NULL**).

- int \* der\_len

  initially the size of  *der* ; will hold the final size.

- unsigned flags

  must be zero

## DESCRIPTION

Creates the DER encoding of the provided object identifier.

## RETURNS

**ASN1\_SUCCESS** if DER encoding was OK, **ASN1\_VALUE\_NOT\_VALID** if  *str* is not a valid OID, **ASN1\_MEM\_ERROR** if the  *der* vector isn't big enough and in this case  *der\_len* will contain the length needed.

## 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/**