Check out crypto-toolkit!
Posted on 28th November 2015
Recently I was working on a JavaScript cryptography toolkit as a side-project. The result is crypto-toolkit. Obviously, don't use it in serious operations because it is probably full of flaws that a hobbyist "cryptographer" like me wouldn't notice. But it is a fun tool nevertheless. The source code is licensed under the MIT license and you can imediately use the tool online right now.