jsrsasign

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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, CRL, OCSP, CMS SignedData, TimeStamp, CAdES JSON Web Signature/Token/Key in pure JavaScript.

Public page is https://kjur.github.io/jsrsasign .

Your bugfix and pull request contribution are always welcomed :)

ADVANCE NOTICE OF END-OF-SUPPORT (2026-APR-10)

The "jsrsasign" will reach end-of-support in a few months. Some unfixed vulnerabilities have been reported for now. Hopefully most of them are fixed until the end of support. GitHub Support for this project will also be closed in a few week. Thank you for your long-standing support of this project.

We will announce the end-of-support date here as soon as it is determined.

NOTICE FOR 11.0.0 RELEASE

The "jsrsasign" library is a long lived JavaScript library from 2010 developed with old JavaScript style and backword compatibility. From coming release 11.0.0, following changes have been applied:

• Stop to support Internet Explorer.
• Stop to support bower.
• Modern ECMA functions will be introduced such as Promise, let, Array methods or class.
• API document generator will be changed from Jsdoc Toolkit to JSDoc3.
• Module bandler will be used such as browserify or webpack.
• Not to use YUI compressor.
• Unit test framework will be changed from QUnit and mocha to jest.
• W3C Web Crypto API support.
• split into some modules besides jsrsasign have been all in package before 11.0.0.

NEWS

• 2024-Jan-16: Security advisory and update for Marvin attack vulnerability published. Due to this vulnerability, RSA PKCS#1.5 and RSAOAEP encryption/decryption no longer be supported.
• 2023-Mar-12: 10.7.0 Release. Now supports custom X.509 extension and custom OIDs by new "Add-on" architecture. (See here in detail)
• 2021-Nov-21: 10.5.0 Release. Now supports secp521r1(P-521) ECDSA.
• 2021-Apr-14: Security advisory and update for CVE-2021-30246 RSA signature validation vulnerability published
• 2020-Oct-05: jsrsasign won Google Open Source Peer Bonus Award. Thank you Google.
• 2020-Sep-23: 10.0.0 released for CMS SignedData related class including timestamp and CAdES architecture update
• 2020-Aug-24: 9.1.0 released to new CRL APIs align with certificate
• 2020-Aug-19: 9.0.0 released for major update of certificate and CSR generation and parsing without backward compatibility. Please see migration guide in detail.
• 2020-Aug-02: twitter account @jsrsasign started for announcement. please follow.

HIGHLIGHTS

• Swiss Army Knife style all in one package crypto and PKI library
• available on Node.js and browsers
• Long live open source software from 2010
• very easy API to use
• powerful various format key loader and ASN.1 API
• rich document and samples
• no dependency to other library
• no dependency to W3C Web Cryptography API nor OpenSSL
• no dependency on newer ECMAScirpt function. So old browsers also supported.
• very popular crypto library with 1M+ npm downloads/month
• supports "Add-on" architecture

INSTALL

Node NPM

> npm install jsrsasign jsrsasign-util

Bower

> bower install jsrsasign

Or include in HTML from many CDN sites

> <script src="https://cdnjs.cloudflare.com/ajax/libs/jsrsasign/8.0.20/jsrsasign-all-min.js"></script>

USAGE

Loading encrypted PKCS#5 private key:

> var rs = require('jsrsasign');
> var rsu = require('jsrsasign-util');
> var pem = rsu.readFile('z1.prv.p5e.pem');
> var prvKey = rs.KEYUTIL.getKey(pem, 'passwd');

Sign string 'aaa' with the loaded private key:

> var sig = new a.Signature({alg: 'SHA1withRSA'});
> sig.init(prvKey);
> sig.updateString('aaa');
> var sigVal = sig.sign();
> sigVal
'd764dcacb...'

MORE TUTORIALS AND SAMPLES

• Tutorials in GitHub Wiki
• Sample Node Scripts

RECENT SECURITY ADVISORY

Here is full published security advisory list.