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ASN.1 Editor

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There are versions of this package awaiting moderation . See the Version History section below.

This package was approved by moderator gep13 on 5/8/2019.

The code consist of two parts:

  1. ASN.1 parser library. This library I wrote, is very fast and memory efficient.
  2. Graphical User Interface provided by Windows Presentation Framework (WPF) with MVVM (Model-View-ViewModel) pattern.

Old tool has unacceptable slow performance. For example, it took about 7 minutes to open a 90kb certificate revocation list file. While, for my tool it is a matter of 2-3 seconds on the same hardware. Feel the difference.

Same look new quality

The new tool resembles WinForms tool visual behavior, so existing editor users will not have difficulties with new tool:


and comparing with previous tool:


Very similar, so existing editor users will not face problems while using my own (if they wish to use new editor).

Main Features

Main features in most are the same.

Dump Text Format data

You can view the selected node branch text dump by right-clicking the designated node and selecting “View Node Text”:


This window provides TreeView textual visualization. It defines four columns:

  • Offset – specifies the start offset of the specified structure;
  • Len – specifies the structure’s payload length in bytes;
  • LenByte – specifies how many bytes are required to store length bytes (including transitional length byte). I’m not sure whether it is necessary, maybe we need more interesting data?
    Tree View text visualizer with decoded primitive type value.
    You can save this information to a file and print, if necessary.

Hex data viewer


in previous tool, hex data viewer was a separate window. I decided to combine them in the same window. By default, hex viewer is collapsed and can be opened by toggling the button in the toolbar. Hex viewer panel contains two toggle buttons. They are used to hide hex address and ASCII data panes:


When you select node in the Tree View panel, corresponding bytes are highlighted in the hex viewer as follows:

  • Red – this color indicates tag byte
  • Green – this color indicates length bytes. This includes transitional byte (if any).
  • Black – this color indicates the payload bytes.

Node data editor

By double-clicking on a node (or selecting from tree node context menu), a node data editor is opened:


You can edit data for any primitive non-constructed type (except, NULL tag). Explicit value presentation depends on data type. For many types, textual value is displayed and allowed for input. However, not for all types there is encoder and decoder, so for certain types you will see raw hex view (and raw hex text should be inserted):


As already said, NULL and constructed types are not editable:


Note: Node content editor applies restrictions for certain data types. For example, if you are editing numeric strict, the code verifies whether all characters in the text are valid for numeric string.

To install ASN.1 Editor, run the following command from the command line or from PowerShell:

C:\> choco install asn1editor

To upgrade ASN.1 Editor, run the following command from the command line or from PowerShell:

C:\> choco upgrade asn1editor


  • legal\LICENSE.txt Show
    # Microsoft Public License (Ms-PL)
    Copyright (c) 2019 Vadims Podans
    This license governs use of the accompanying software. If you use the software, you accept this license. If you do not accept the license, do not use the software.
    1. Definitions
    The terms "reproduce," "reproduction," "derivative works," and "distribution" have the same meaning here as under U.S. copyright law.
    A "contribution" is the original software, or any additions or changes to the software.
    A "contributor" is any person that distributes its contribution under this license.
    "Licensed patents" are a contributor's patent claims that read directly on its contribution.
    2. Grant of Rights
    (A) Copyright Grant- Subject to the terms of this license, including the license conditions and limitations in section 3, each contributor grants you a non-exclusive, worldwide, royalty-free copyright license to reproduce its contribution, prepare derivative works of its contribution, and distribute its contribution or any derivative works that you create.
    (B) Patent Grant- Subject to the terms of this license, including the license conditions and limitations in section 3, each contributor grants you a non-exclusive, worldwide, royalty-free license under its licensed patents to make, have made, use, sell, offer for sale, import, and/or otherwise dispose of its contribution in the software or derivative works of the contribution in the software.
    3. Conditions and Limitations
    (A) No Trademark License- This license does not grant you rights to use any contributors' name, logo, or trademarks.
    (B) If you bring a patent claim against any contributor over patents that you claim are infringed by the software, your patent license from such contributor to the software ends automatically.
    (C) If you distribute any portion of the software, you must retain all copyright, patent, trademark, and attribution notices that are present in the software.
    (D) If you distribute any portion of the software in source code form, you may do so only under this license by including a complete copy of this license with your distribution. If you distribute any portion of the software in compiled or object code form, you may only do so under a license that complies with this license.
    (E) The software is licensed "as-is." You bear the risk of using it. The contributors give no express warranties, guarantees or conditions. You may have additional consumer rights under your local laws which this license cannot change. To the extent permitted under your local laws, the contributors exclude the implied warranties of merchantability, fitness for a particular purpose and non-infringement.
  • legal\VERIFICATION.txt Show
    Verification is intended to assist the Chocolatey moderators and community
    in verifying that this package's contents are trustworthy.
    Package can be verified like this:
    1. Download:
    2. You can use one of the following methods to obtain the SHA256 checksum:
       - Use powershell function 'Get-FileHash'
       - Use Chocolatey utility 'checksum.exe'
       checksum type: sha256
       checksum32: F05FBCBA463F617E656C7BB5A6F01C4BFC439F63F2750C1605C894DAF3DC2658
       checksum64: F05FBCBA463F617E656C7BB5A6F01C4BFC439F63F2750C1605C894DAF3DC2658
    File 'LICENSE.txt' is obtained from:
  • tools\ Show
    md5: 91D714A9D8D28241C31A2EF69350C588 | sha1: CF97609CD08F69BEFE5E110D46E207EA5E915853 | sha256: F05FBCBA463F617E656C7BB5A6F01C4BFC439F63F2750C1605C894DAF3DC2658 | sha512: 84903CF1A7D68F54D56484268443EDAA9D7611FAA5DAEC1330E4E7E780C8EE3243E4FC20114DD64732328A75A8C60B7ABC36BA036B2DABBBB0C40C75CED6089D
  • tools\chocolateyinstall.ps1 Show
    $ErrorActionPreference = 'Stop';
    $toolsDir   = "$(Split-Path -parent $MyInvocation.MyCommand.Definition)"
    $packageArgs = @{
      packageName   = $env:ChocolateyPackageName
      destination   = "$toolsDir"
      file          = "$toolsDir\"
    Get-ChocolateyUnzip @packageArgs
    # Install start menu shortcut
    $programs = [environment]::GetFolderPath([environment+specialfolder]::Programs)
    $OSArchitectureWidth = Get-OSArchitectureWidth
    $shortcutFilePath = Join-Path $programs "ASN.1 Editor.lnk"
    $targetPath = Join-Path $toolsDir "Asn1Editor-v1.3.11.3\Asn1Editor-x${OSArchitectureWidth}.exe"
    Install-ChocolateyShortcut -shortcutFilePath $shortcutFilePath -targetPath $targetPath
  • tools\chocolateyuninstall.ps1 Show
    # Remove start menu shortcut
    $programs = [environment]::GetFolderPath([environment+specialfolder]::Programs)
    $shortcutFilePath = Join-Path $programs "ASN.1 Editor.lnk"
    if (Test-Path $shortcutFilePath) { Remove-Item $shortcutFilePath }

Virus Scan Results

In cases where actual malware is found, the packages are subject to removal. Software sometimes has false positives. Moderators do not necessarily validate the safety of the underlying software, only that a package retrieves software from the official distribution point and/or validate embedded software against official distribution point (where distribution rights allow redistribution).

Chocolatey Pro provides runtime protection from possible malware.


This package has no dependencies.

Package Maintainer(s)

Software Author(s)

  • Vadims Podāns


© 2008 - 2019 - Sysadmins LV. All rights reserved


Version History

Version Downloads Last updated Status
ASN.1 Editor 4 Saturday, August 17, 2019 submitted

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