---
name: "dumpasn1"
section: "1"
platform: "linux"
package: "dumpasn1"
version: "20210212-3"
release: "Debian 12 (Bookworm)"
platforms: ["linux"]
url: "https://new.carta.tech/dumpasn1"
---

# dumpasn1(1)

ASN.1 object dump/syntax check program

## NAME

dumpasn1 - ASN.1 object dump/syntax check program

## SYNOPSIS

**dumpasn1** \[*-acdefghilmoprstuvwxz*\] *\<file\>*

## DESCRIPTION

An ASN.1 object dump program which will dump data encoded using any of the ASN.1 encoding rules in a variety of user-specified formats.

DumpASN1 - ASN.1 object dump/syntax check program. Copyright Peter Gutmann 1997 - 2021.  Last updated 12 February 2021.

-

  Input options:

-

  \- = Take input from stdin (some options may not work properly) -\<number\> = Start \<number\> bytes into the file **--** = End of arg list **-c**\<file\> = Read Object Identifier info from alternate config file

-

  (values will override equivalents in global config file)

-

  Output options:

**-f**\<file\> = Dump object at offset -\<number\> to file (allows data to be

-

  extracted from encapsulating objects)

**-w**\<number\> = Set width of output, default = 80 columns

-

  Display options:

**-a** = Print all data in long data blocks, not just the first 128 bytes

**-d** = Print dots to show column alignment

**-g** = Display ASN.1 structure outline only (no primitive objects)

**-h** = Hex dump object header (tag+length) before the decoded output

**-hh** = Same as **-h** but display more of the object as hex data

**-i** = Use shallow indenting, for deeply-nested objects

**-l** = Long format, display extra info about Object Identifiers

- **-m**\<number\>

  \= Maximum nesting level for which to display content

**-p** = Pure ASN.1 output without encoding information

**-t** = Display text values next to hex dump of data

**-v** = Verbose mode, equivalent to **-ahlt**

-

  Format options:

**-e** = Don't print encapsulated data inside OCTET/BIT STRINGs

**-r** = Print bits in BIT STRING as encoded in reverse order

**-u** = Don't format UTCTime/GeneralizedTime string data

**-x** = Display size and offset in hex not decimal

-

  Checking options:

**-o** = Don't check validity of character strings hidden in octet strings

**-s** = Syntax check only, don't dump ASN.1 structures

**-z** = Allow zero-length items

Warnings generated by deprecated OIDs require the use of '-l' to be displayed. Program return code is the number of errors found or EXIT\_SUCCESS.

## COMMENT

This manual page was written by Mathieu Malaterre \<malat@debian.org\> for the Debian GNU/Linux system, but may be used by others.

## FILES

$HOME/.dumpasn1.cfg, /etc/dumpasn1/dumpasn1.cfg:

This is the configuration file, it will be searched in this order. It contains OIDs commonly used.

## AUTHOR

quote from Peter Gutmann:

ASN.1 object dumping code, copyright Peter Gutmann \<pgut001@cs.auckland.ac.nz\>, based on ASN.1 dump program by David Kemp \<dpkemp@missi.ncsc.mil\>, with contributions from various people including Matthew Hamrick \<hamrick@rsa.com\>, Bruno Couillard \<bcouillard@chrysalis-its.com\>, Hallvard Furuseth \<h.b.furuseth@usit.uio.no\>, Geoff Thorpe \<geoff@raas.co.nz\>, David Boyce \<d.boyce@isode.com\>, John Hughes \<john.hughes@entegrity.com\>, Life is hard, and then you die \<ronald@trustpoint.com\>, Hans-Olof Hermansson \<hans-olof.hermansson@postnet.se\>, Tor Rustad \<Tor.Rustad@bbs.no\>, Kjetil Barvik \<kjetil.barvik@bbs.no\>, James Sweeny \<jsweeny@us.ibm.com\>, and several other people whose names I've misplaced.

dumpasn1 is available at https://www.cs.auckland.ac.nz/~pgut001/

## COPYRIGHT

Copyright Peter Gutmann 1997 - 2016. Last updated 22 October 2019.