ASN1DECODING(1) User Commands ASN1DECODING(1)

# [NAME](#NAME)

asn1Decoding - ASN.1 DER decoder

# [SYNOPSIS](#SYNOPSIS)

**asn1Decoding** \[*OPTION*] *DEFINITIONS ENCODED ASN1TYPE*

# [DESCRIPTION](#DESCRIPTION)

Decodes DER data in ENCODED file, for the ASN1TYPE element described in ASN.1 DEFINITIONS file, and print decoded structures.

[**-b**, **--benchmark**](#b)

perform a benchmark on decoding

[**-s**, **--strict**](#s)

use strict DER decoding

[**-t**, **--no-time-strict**](#t)

use strict DER decoding but not in time fields

[**-h**, **--help**](#h)

display this help and exit

[**-v**, **--version**](#v)

output version information and exit

# [AUTHOR](#AUTHOR)

Written by Fabio Fiorina.

# [REPORTING BUGS](#REPORTING_BUGS)

Report bugs to: help-libtasn1@gnu.org  
GNU Libtasn1 home page: <https://www.gnu.org/software/libtasn1/>  
General help using GNU software: <https://www.gnu.org/gethelp/>

# [COPYRIGHT](#COPYRIGHT)

Copyright © 2026 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.  
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.

# [SEE ALSO](#SEE_ALSO)

The full documentation for **asn1Decoding** is maintained as a Texinfo manual. If the **info** and **asn1Decoding** programs are properly installed at your site, the command

**info libtasn1**

should give you access to the complete manual.

January 2026 libtasn1 4.21.0

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Document: asn1Decoding(1) from libtasn1 4.21.0-r6 (Chainguard OS)
Source: https://gitlab.com/gnutls/libtasn1