Twofish Javascript
In Spring 2000, I ported C implementations of Twofish and SHA-1 over to Javascript as a way of password-protecting the contents of static web pages (this was before I had done any server-side web programming). I never did implement the general password mechanism I was initially planning on, but I did get the encryption code working, and wrote a flexible test interface that can encrypt and decrypt messages in twofish.html.