bitcoinjs-lib
A library containing Bitcoin client-side functionality in JavaScript, most notably ECDSA signing and verification.
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Status
This is currently pretty raw code. We're planning to clean it up, convert everything into CommonJS modules and put a flexible build system in place.
Prototype software, use at your own peril.
License
This library is free and open-source software released under the MIT license.
Copyright
BitcoinJS (c) 2011-2012 Stefan Thomas
Released under MIT license
http://bitcoinjs.org/
JSBN (c) 2003-2005 Tom Wu
Released under BSD license
http://www-cs-students.stanford.edu/~tjw/jsbn/
CryptoJS (c) 2009–2012 by Jeff Mott
Released under New BSD license
http://code.google.com/p/crypto-js/