Installing the OSS ASN.1 Tools for C#

Applies to: ASN.1/C# v5.1-

System Requirements

  • Operating system: Windows 8.1 or later
  • CPU:
    • For 64-bit version: x86-64 (or compatible)
    • For 32-bit version: x86/x86-64 (or compatible)
  • Build tools: Microsoft .NET Framework 3.0 or later, Microsoft Visual Studio 2015 or later (recommended but not required)

Install Instructions

The License Key: A valid ossinfo license authorization file (or ossinfocstrial for trial tools) is required to successfully install and run the OSS ASN.1 Tools compiler. This file is provided by email at the time of purchase or trial and contains specific information about your license and the system on which you are authorized to run the program. If you need help locating your ossinfo file, contact

  1. You must have administrator privileges on the system where the OSS ASN.1 Tools for C# will be installed.

    Download and run the installation executable for your license and platform. Follow the on-screen instructions. The install program prompts you for the location of the ossinfo file. Specify the folder location using the Browse button or allow the program to search for the file. Once the license key is found, it is validated and copied to the \Program Files\OSS Nokalva folder. When installation is complete, launch the program from the OSS ASN.1 Tools for C# program menu.

    By default, the installation folder is
    \Program Files\OSS Nokalva\asn1csharp\<platform name>\<version number>
    However, the installation program gives you the option to select a different folder, if you wish.

    ASN.1 Studio, a powerful IDE, is packaged with the OSS ASN.1 Tools for C#. The default installation folder for ASN.1 Studio is
    \Program Files\OSS Nokalva\asn1studio\<platform name>

    NOTE: If a Windows 32-bit (x86) version of the Tools is installed on a Windows 64-bit (x64) system, the default installation folder will be
    \Program Files (x86)\OSS Nokalva\...
    NOTE: If you are installing a 30-day trial version of the OSS ASN.1 Tools for C#, the following exceptions apply:
    • The license authorization filename is ossinfocstrial.
    • The default installation directory for the trial is
      C:\Program Files\OSS Nokalva\asn1csharp\<platform name>.trial\<version number>.
    • Use the OSSINFOTRIAL environment variable to point to a non-default location of the ossinfocstrial file.
  2. Select Introduction from the program menu to read about what's new in this release, how to access samples, runtime choices, and more.

    Access documentation and information on getting started with ASN.1 Studio from Help on the ASN.1 Studio main menu.

Our Product Knowledge Center provides answers to frequently asked questions, programming and protocol examples, and sample programs that demonstrate support for various industry standards using ASN.1.

For assistance with software installation send email to

For technical support send email to and include the following information in your message:

  • Your license number
  • Your name
  • Your company name
  • A brief description of the problem

This documentation applies to the OSS® ASN.1 Tools for C# release 5.1 and later.

Copyright © 2022 OSS Nokalva, Inc. All rights reserved.
No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means electronic, mechanical, photocopying, recording or otherwise, without the prior permission of OSS Nokalva, Inc.
Every distributed copy of the OSS® ASN.1 Tools for C# is associated with a specific license and related unique license number. That license determines, among other things, what functions of the OSS ASN.1 Tools for C# are available to you.