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Tool Factory

Keys, Certificates & Tokens

ASN.1 hex string Parser

Read ASN.1 hex string input and show its structured details. Enter the key material, choose the required format, then review the result.

Tool workspace

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Add the required input to continue.

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Options

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Read ASN.1 hex string input and show its structured details. Enter the key material, choose the required format, then review the result.

This tool runs open-source code from CyberChef by GCHQ (Apache License 2.0). See open-source credits.

ASN.1 hex string Parser performs ASN.1 hexadecimal tree inspection for the supplied key or certificate data. It displays the nested ASN.1 structure; the fixture contains a sequence with integer 1.

It displays the nested ASN.1 structure; the fixture contains a sequence with integer 1. This result runs in the browser for this catalog category. Processing runs in the browser.

Conversion and parsing preserve or display key data; they do not create trust, authorization, or certificate validation.

Instructions

  1. Provide text or data for this tool.
  2. Use hexadecimal bytes, not PEM armor. This applies to ASN.1 hex string Parser.
  3. Increase the truncation setting when a long octet value needs inspection. This applies to ASN.1 hex string Parser.

Example

Input: Use DER hex "3003020101", Starting index 0, and octet-string truncation 32.

Settings: ASN.1 hex string Parser: Starting index selects the position in the hexadecimal representation. Truncate octet strings longer than limits the displayed octet content.

Result: It displays the nested ASN.1 structure; the fixture contains a sequence with integer 1.

Limits

  • ASN.1 hex string Parser: A structure dump is not application-specific certificate validation.
  • ASN.1 hex string Parser: Truncated display content is not proof that the underlying bytes are absent.

Questions

What input does ASN.1 hex string Parser accept?

ASN.1 hex string Parser accepts text. Abstract Syntax Notation One (ASN.1) is a standard and notation that describes rules and structures for representing, encoding, transmitting, and decoding data in telecommunications and computer networking. This operation parses arbitrary ASN.1 data (encoded as an hex string: use the 'To Hex' operation if necessary) and presents the resulting tree.

Which settings does ASN.1 hex string Parser provide?

ASN.1 hex string Parser provides controls for Starting index, Truncate octet strings longer than.

What does ASN.1 hex string Parser return?

ASN.1 hex string Parser returns text. Abstract Syntax Notation One (ASN.1) is a standard and notation that describes rules and structures for representing, encoding, transmitting, and decoding data in telecommunications and computer networking. This operation parses arbitrary ASN.1 data (encoded as an hex string: use the 'To Hex' operation if necessary) and presents the resulting tree.