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ASN.1 Editor

, 30 Jun 2008
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An editor to view, analyse and modify ASN.1 DER encoded data
ASN.1 Editor Main Screen

Introduction

Abstract Syntax Notation One (ASN.1) Distinguished Encoding Rule (DER) encoded data is widely used in digital security protocols (i.e. X509 digital certificate). The encoded data is not readable by regular text editors. The Asn1Processor Library is designed to parse and modify ASN.1 DER encoded data. The ASN.1 Editor is a sample project that uses the Asn1Processor library to view and to edit DER encoded data. The Asn1Processor Library source code and reference documentation (Asn1EditorLib.chm) are also included in the downloadable source code zip file.

The ASN.1 Editor doesn't do any schema checking. The user needs to make sure the edited data conforms to certain constrains (i.e. OCSP request or Key Info structure).

Main Features

1. Dump Text Format Data

You can view the selected node branch text dump by right-clicking the designated node and selecting "View Node Text". View Node Text

2. Atomically Parse “Encapsulates” Data

OCTET and BITSTRING may encapsulate ASN.1 DER encoded data, for example:

Encapsulate Parse Sample

The ASN.1 Editor can automatically parse the data structure.

3. Hex Data Viewer

Click "View->Hex Viewer" and you can view the binary data structure.

Hex Viewer

4. Extensible OID Table

OID.txt file is installed in the same directory as Asn1Editor.EXE.

Here are the sample records:

0.9.2342.19200300.100.1.25, domainComponent
1.2.36.68980861.1.1.10, Signet pilot
1.2.36.68980861.1.1.11, Signet intraNet
1.2.36.68980861.1.1.2, Signet personal
1.2.36.68980861.1.1.20, Signet securityPolicy

The OID and the description are comma separated. It can be extended in order to add in additional OIDs.

5. Change Node Content

Double click the selected node and you can see the "Node Content Editor".

Node Content Editor

6. Save Selected Node Data into Another File

You can save the designated node data into a file by right-clicking the node and selecting "Save selected node as...".

7. Copy Selected Node Data into Clipboard

Right-click the node and select "Copy".

8. Paste Node Data from Clipboard

Right-click the insertion point node and select "Paste as last child node", "Paste before current node", or "Paste after current node" to perform the insert operation.

9. Binary/Hex/Base64 Data Converter

Convert the data format between Hex, Base64, and PEM using the "Data Converter".

Data Converter

History

  • 3rd September, 2003: Initial post
  • 29th June, 2008: Updated source code and installer
    The changes are mainly for bug fixing, Visual Studio 2005, and Vista support.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Liping Dai
Software Developer (Senior)
United States United States
Liping Dai has worked in IT industry more than 17 years. He moved to Canada in 1996. After worked in Toronto for 4 years, he relocated to Silicon Valley. He has strong passion in the area of Multi-core/Multi thread programming, Parallel Computing, Image Reorganization, Secure Communication, and Mobile Device development.

Comments and Discussions

 
GeneralMy vote of 1 [modified] PinmemberMYS7717-Sep-14 6:11 
GeneralMy vote of 5 PinmemberMember 1089613019-Jun-14 21:40 
Questioncan you decouple the asn1 node class from System.Windows.Forms.TreeNode class? Pinmemberfoundationsoft3-Oct-13 16:18 
AnswerRe: can you decouple the asn1 node class from System.Windows.Forms.TreeNode class? PinmemberLiping Dai3-Oct-13 17:11 
GeneralNice tool, but can't handle 'indefinite' length PinmemberQistoph17-Mar-11 11:39 
GeneralRe: Nice tool, but can't handle 'indefinite' length [modified] Pinmemberdheijl17-Nov-11 3:40 
GeneralRe: Nice tool, but can't handle 'indefinite' length PinmemberQistoph17-Nov-11 21:28 
GeneralRe: Nice tool, but can't handle 'indefinite' length Pinmemberdheijl17-Nov-11 21:39 
GeneralRe: Nice tool, but can't handle 'indefinite' length PinmemberQistoph17-Nov-11 21:46 
GeneralExcellent tool, + problem PinmemberCodyBatt14-Dec-10 11:39 
GeneralMy vote of 5 PinmemberAlastair Taylor7-Oct-10 2:50 
GeneralAssigning ASN.1 BER file for decoding Pinmemberkkonline55522-Mar-10 5:55 
GeneralASN1 Visualizer PinmemberKinslayerUY17-Sep-09 6:01 
General[Message Removed] PinmemberKatekortez25-Oct-08 9:30 
GeneralConverting signed data (with PKCS7) to ASN1Node PinmemberAsaf Levy22-Apr-08 19:12 
GeneralRe: Converting signed data (with PKCS7) to ASN1Node PinmemberKinslayerUY17-Sep-09 5:53 
QuestionWriting ASN.1 specification for an audio file (.WAV) PinmemberASN1keith24-Feb-08 11:45 
GeneralI want to convert Base 64 certificate to DER format Pinmemberyetty200028-Jun-07 21:08 
GeneralFile DER PinmemberSara9781-Jun-05 5:44 
GeneralRe: File DER PinmemberLiping Dai1-Jun-05 19:52 
GeneralFile in title bar/file name on command line PinmemberTony Morris12-May-05 18:20 
GeneralRe: File in title bar/file name on command line PinmemberLiping Dai16-May-05 3:24 
GeneralRe: File in title bar/file name on command line PinmemberTony Morris16-May-05 12:26 
My apologies - I downloaded the 2003 version from codeproject.com.
 
Tony Morris
GeneralINTEGER value 0 encoding error PinmemberJoe Hartford6-Apr-05 12:27 
GeneralRe: INTEGER value 0 encoding error PinmemberLiping Dai25-Apr-05 20:44 
QuestionIs this project still moving? PinmemberTony Morris3-Apr-05 14:10 
AnswerRe: Is this project still moving? PinmemberLiping Dai3-Apr-05 16:43 
GeneralRe: Is this project still moving? Pinsuss[Tony Morris]3-Apr-05 18:41 
GeneralRe: Is this project still moving? PinmemberLiping Dai3-Apr-05 19:21 
GeneralRe: Is this project still moving? PinmemberTony Morris4-Apr-05 18:09 
GeneralRe: Is this project still moving? PinmemberLiping Dai4-Apr-05 20:10 
GeneralOID Encoding Error Pinmemberjfrazier00426-Mar-05 9:08 
GeneralRe: OID Encoding Error PinmemberLiping Dai27-Mar-05 12:46 
General.ber and . der PinmemberBigAzam23-Feb-05 15:02 
GeneralRe: .ber and . der PinsussAnonymous23-Feb-05 19:15 
GeneralRe: .ber and . der PinmemberBigAzam7-Apr-05 6:20 
QuestionHow to detect if the node has one or multiple tags? Pinsussgreatx16-Feb-05 16:17 
AnswerRe: How to detect if the node has one or multiple tags? PinmemberLiping Dai16-Feb-05 19:28 
GeneralOpening X509 signed files. Pinmembersillypuppy23-Jan-05 22:41 
GeneralRe: Opening X509 signed files. PinmemberLiping Dai24-Jan-05 19:10 
GeneralRe: Opening X509 signed files. Pinmembersillypuppy24-Jan-05 23:48 
GeneralFantastic tool. Pinmembersillypuppy22-Jan-05 5:48 
GeneralRe: Fantastic tool. PinmemberLiping Dai22-Jan-05 7:15 
GeneralRe: Fantastic tool. Pinmembersillypuppy23-Jan-05 1:33 
GeneralRe: Fantastic tool. PinmemberLiping Dai23-Jan-05 8:15 
GeneralRe: Fantastic tool. Pinmembersillypuppy23-Jan-05 22:16 
GeneralGreat Stuff and Thanks for your generousness Pinmemberyianfang24-May-04 8:55 
GeneralRe: Great Stuff and Thanks for your generousness PinmemberLiping Dai27-May-04 22:16 
GeneralI got it PinmemberCS_Sniper28-Dec-03 18:48 
GeneralThanks PinmemberLiping Dai4-Sep-03 1:44 

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