---
name: "asn1_der_decoding_element"
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_der_decoding_element"
---

# asn1\_der\_decoding\_element(3)

API function

## NAME

asn1\_der\_decoding\_element - API function

## SYNOPSIS

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

**int asn1\_der\_decoding\_element(asn1\_node \*** *structure***, const char \*** *elementName***, const void \*** *ider***, int** *len***, char \*** *errorDescription***);**

## ARGUMENTS

- asn1\_node \* structure

  pointer to an ASN1 structure

- const char \* elementName

  name of the element to fill

- const void \* ider

  vector that contains the DER encoding of the whole structure.

- int len

  number of bytes of \*der: der\[0\]..der\[len-1\]

- char \* errorDescription

  null-terminated string contains details when an error occurred.

## DESCRIPTION

Fill the element named  *ELEMENTNAME* with values of a DER encoding string.  The structure must just be created with function **asn1\_create\_element()**.  The DER vector must contain the encoding string of the whole  *STRUCTURE* .  If an error occurs during the decoding procedure, the \* *STRUCTURE* is deleted and set equal to **NULL**.

This function is deprecated and may just be an alias to asn1\_der\_decoding in future versions. Use **asn1\_der\_decoding()** instead.

## RETURNS

**ASN1\_SUCCESS** if DER encoding OK, **ASN1\_ELEMENT\_NOT\_FOUND** if ELEMENT is **NULL** or  *elementName* == NULL, and **ASN1\_TAG\_ERROR** or **ASN1\_DER\_ERROR** if the der encoding doesn't match the structure  *structure* (\*ELEMENT deleted).

## 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/**