asn1\_der\_decoding(3) libtasn1 asn1\_der\_decoding(3)

# [NAME](#NAME)

asn1\_der\_decoding - API function

# [SYNOPSIS](#SYNOPSIS)

**#include <libtasn1.h>**

**int asn1\_der\_decoding(asn1\_node * element, const void * ider, int ider\_len, char * errorDescription);**

# [ARGUMENTS](#ARGUMENTS)

[asn1\_node * element](#asn1_node)

pointer to an ASN1 structure.

[const void * ider](#const)

vector that contains the DER encoding.

[int ider\_len](#int)

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

[char * errorDescription](#char)

null-terminated string contains details when an error occurred.

# [DESCRIPTION](#DESCRIPTION)

Fill the structure * *element* with values of a DER encoding string. The structure must just be created with function **asn1\_create\_element()**.

Note that the * *element* variable is provided as a pointer for historical reasons.

# [RETURNS](#RETURNS)

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

# [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_der_decoding(3) from libtasn1 4.21.0-r9 (Chainguard OS)
Source: https://gitlab.com/gnutls/libtasn1