A pure JavaScript implementation of large-integer math, capable of performing useful-sized (512-bit, 1024-bit) RSA encryption. Packaged to also be used in a node environment.

This library is a packaging of the original code from Tom Wu. The original files are available in the original/ folder or on his site.

If you are using npm (the node packet manager), installing is as easy as: npm install bignumber

For help on using this in node.js, have a look at the tests. Here is a simple example on how to generate a new key and use it to encrypt/decrypt a message.

var rsa = require("bigint");
var key = new rsa.Key();

var message = "All your bases are belong to us.";
console.log("Message:\n"+message+"\n");

// Generate a key
key.generate(1024, "10001");
console.log("Key:\n");
console.log("n:" + key.n.toString(16));
console.log("e:" + key.e.toString(16));
console.log("d:" + key.d.toString(16));
console.log("\n");

// Encrypt
var encrypted = key.encrypt(message);
console.log("Encrypted:\n" + rsa.linebrk(encrypted, 64) + "\n" );

// Decrypt
var decrypted = key.decrypt(encrypted);
console.log("Decrypted:" + rsa.linebrk(decrypted, 64) + "\n");

The original documentation is available at http://www-cs-students.stanford.edu/~tjw/jsbn/.

Copyright (c) 2003-2005 Tom Wu All Rights Reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

IN NO EVENT SHALL TOM WU BE LIABLE FOR ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

In addition, the following condition applies:

All redistributions must retain an intact copy of this copyright notice and disclaimer.