For the last 3 years, I have been working on a tool to help me debug ASN1-encoded data (keys, certificates, Kerberos/CredSSP/SPNEGO/etc data structures, and more) and cryptographic operations.

A few days ago, I shipped a significant feature: ASN1 tree editor. Now it can parse and edit the ASN1 tree directly on the page. I found it very useful and may be helpful for others.

Follow the link and try it. Short manual:

* hold `ctrl` and click on the tree node title to edit;

* hold `ctrl` and move the mouse between nodes to add a new node;

* hold `ctrl` and move the mouse to the start of the node title to remove the node.

A complete user guide with images can be found in my blog post: https://tbt.qkation.com/posts/announcing-crypto-helper-0-16/.

Overall, this tool can also perform many crypto-algorithms and has a JWT debugger. But that's another story :)

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