jsrsasign

opensource free pure JavaScript cryptographic library supports RSA/RSAPSS/ECDSA/DSA signing/validation, ASN.1, PKCS#1/5/8 private/public key, X.509 certificate, CRL, CMS SignedData, TimeStamp, CAdES and JSON Web Signature(JWS)/Token(JWT)/Key(JWK)

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FEATURES

The 'jsrsasign' library provides following features in pure JavaScript.

Signature - RSA/RSAPSS/ECDSA/DSA digital signature class wrapper of Java JCE style
MessageDigest - cryptographic hash calculation class wrapper of Java JCE style
MAC - message authentication code hash calculation class wrapper of Java JCE style
ASN.1 encoder/generator
ASN.1 structure for X.509 ceritificate, CRL and CSR(PKCS#10) generation
ASN.1 structure for CMS SignedData generation
ASN.1 structure for RFC 3161 TimeStamp generation
ASN.1 structure for RFC 5126 CAdES Long Term Signature generation
simple ASN.1 data parser
simple X.509 certificate parser/reader
KEYUTIL - loading RSA/EC/DSA private/public key from PEM formatted PKCS#1/5/8 and X.509 certificate
JSON Web Siguature(JWS), JSON Web Token(JWT) and JSON Web Key(JWK)
Supported formats and algorithms are listed here.

NEWS

2016-Feb-28:: Release 5.0.6 is now available. Now jsrsasign can be used in strict mode (--use_strict) of Node.JS.
2015-Nov-23:: Release 5.0.4 is now available. There is no library and npm update but sample Node scirpts are added. Especially I hope jwtverify tool is very useful for JOSE guys :).
2015-Nov-11:: Release 5.0.2 is now available. RFC 7638 JWK thumbprint supported. Some file read/save functions added for Node.js in nodeutil.js.
2015-Oct-14:: Release 5.0.0 is now available. Mac class some issue fix and extra features for Mac passwords. It is also affects to JWS class. KEYUTIL.getKey supports RSA JWK without P/Q/DP/DQ/COEFF.
NOTICE: Release 4.10.0 was declined because of semver violation.
2015-Sep-15:: Keypair and CSR generator demonstration page is available.
2015-Sep-13:: Release 4.9.0 is now available. Certificate signing request (CSR/PKCS#10) support is added.

Old news is here.

ONLINE TOOL & DEMO

DOWNLOAD

Use git to clonse the official jsrsasign repository
git clone git://github.com/kjur/jsrsasign.git
otherwise bower install jsrsasign
Alternatively, you can download a zip file for the latest development version or a previous releases.

See 'ChangeLog.txt' in detail.

API DOCUMENT

The 'jsrsasign'(RSA-Sign JavaScript Library) JavaScript API document is available here.

LICENSE

The 'jsrsasign'(RSA-Sign JavaScript Library) is licensed under the terms of the MIT license reproduced which is simple and easy to understand and places almost no restrictions.

LICENSE.txt - RSA-Sign JavaScript Library LICENSE

PROGRAMMING TUTORIALS

You can see the list of QUnit unit tests here and I hope they help you understand 'jsrsasign' library and APIs.

PROJECTS THAT USE JSRSASIGN

jwcrypto: JavaScript implementation of JWS, JWT and JWC. The jycrypto is also used by Mozilla BrowserID/Persona. (used here)
jwt-js: JSON Web Tokens implemented in pure JavaScript. (used here)
npm node-bignumber: A pure javascript implementation of BigIntegers and RSA crypto for Node.js (used here)
npm bignumber-jt: A pure javascript implementation of BigIntegers and RSA crypto. (used here)
NDN.JS: a JavaScript client library for Named Data Networking of Univ. of Memphis. (used here)
cryptio: An easy-to-use encryption system utilizing RSA and AES for javascript. (used here)
jspackcrx: Package Chrome extension files using pure JavaScript. (used here)
xml-signer: xmldsig signatures in a browser (used here)

DEPENDENCY

Tom Wu's jsbn library - BigInteger, RSA and ECC
BitcoinJS library - ECDSA signature algorithm
CryptoJS - symmetric key encryption algorithms, message digest, message authentication codes and PBKDF
OpenPGP.js - DSA signature algorithm
Yahoo YUI library - for class inheritance