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

# [NAME](#NAME)

asn1\_object\_id\_der - API function

# [SYNOPSIS](#SYNOPSIS)

**#include <libtasn1.h>**

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

# [ARGUMENTS](#ARGUMENTS)

[const char * str](#const)

An object identifier in numeric, dot format.

[unsigned char * der](#unsigned)

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

[int * der\_len](#int)

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

[unsigned flags](#unsigned~2)

must be zero

# [DESCRIPTION](#DESCRIPTION)

Creates the DER encoding of the provided object identifier.

# [RETURNS](#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)

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_object_id_der(3) from libtasn1 4.21.0-r8 (Chainguard OS)
Source: https://gitlab.com/gnutls/libtasn1