asn1\_expand\_octet\_string(3) libtasn1 asn1\_expand\_octet\_string(3)

# [NAME](#NAME)

asn1\_expand\_octet\_string - API function

# [SYNOPSIS](#SYNOPSIS)

**#include <libtasn1.h>**

**int asn1\_expand\_octet\_string(asn1\_node\_const definitions, asn1\_node * element, const char * octetName, const char * objectName);**

# [ARGUMENTS](#ARGUMENTS)

[asn1\_node\_const definitions](#asn1_node_const)

ASN1 definitions

[asn1\_node * element](#asn1_node)

pointer to an ASN1 structure

[const char * octetName](#const)

name of the OCTET STRING field to expand.

[const char * objectName](#const~2)

name of the OBJECT IDENTIFIER field to use to define the type for expansion.

# [DESCRIPTION](#DESCRIPTION)

Expands an "OCTET STRING" element of a structure created from a DER decoding process (the **asn1\_der\_decoding()** function). The type used for expansion is the first one following the definition of the actual value of the OBJECT IDENTIFIER indicated by OBJECTNAME.

# [RETURNS](#RETURNS)

**ASN1\_SUCCESS** if substitution OK, **ASN1\_ELEMENT\_NOT\_FOUND** if *objectName* or *octetName* are not correct, **ASN1\_VALUE\_NOT\_VALID** if it wasn't possible to find the type to use for expansion, or other errors depending on DER decoding.

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