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Kenji Urushima

Tokyo, Japan

Hello, I'm Kenji Urushima and the developer of the 'jsrsasign' pure JavaScript PKI, cryptography and security library. More funding is allowing more time to work on major architecture design updates, urgent security fixes, new features, documents, samples and user support. Please consider sponsoring if you want to be a part of the project.

Future Plan for jsrsasign

  • modern JavaScript coding
  • modular design: Some people complains this library is so huge to download. Someone may want to use just for JWT. So this library shall be separated in modules.
  • more cryptographic algorithm support: add missing algorithms such as AES-GCS, EdDSA or more EC curves.
  • simple and/or full RFC 5280 certification path validation
  • more X.509 v3 extensions
  • CAdES-A support
  • encrypted JWT and JWE support
  • simple OCSP responder server
  • simple Timestamp server
  • ASN.1 BER support
  • yet another ASN.1 dumper like asn1js decoder
  • online tool pages for mobile

Another Project: SSL Pulse Trends

This project shows trend data of Qualys SSL Pulse site from 2012. Analyzed data will be updated every month. This also needs your support.

One time donation by cryptocurrency

You can donate cryptocurrency to jsrsasign using the following addresses:


Twitter @jsrsasign started. Please follow it for announcements. Gold, Silver and Bronze supports can contact by DM.

Current sponsors 5

Private Sponsor

Past sponsors 15

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Featured work

  1. kjur/jsrsasign

    The 'jsrsasign' (RSA-Sign JavaScript Library) is an opensource free cryptography library supporting RSA/RSAPSS/ECDSA/DSA signing/validation, ASN.1, PKCS#1/5/8 private/public key, X.509 certificate,…

    HTML 3,207
  2. kjur/www

    Public pages for blogs or sandbox. This concludes "SSL Pulse Trends" which shows trend data of "Qualys SSL Pulse" from Apr 2012 and W3C Web Cryptography API samples.

    JavaScript 2

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☀️ Supporter
Thank you for your support!

$5 a month


Coffee Supporter
A cup of coffee may accelerates my development.

$10 a month


🍴 Lunch supporter
Good lunch produces good development.

$30 a month


🍣 🍶 Sushi Dinner Supporter
I love sushi very much. It helps to imagine new feature.

$100 a month


🏆 Bronze Sponsor

  • Your name or small logo will be added to README and public presentation

$250 a month


🏆 🏆 Silver Sponsor

  • Your name or medium logo will be added to README and public presentation
  • priority support in github issues 🚀

$500 a month


🏆 🏆 🏆 Gold Sponsor

  • Your name or big logo will be added to README and public presentation
  • priority support in github issues 🚀 🚀
  • priority feature request