Development has continued at https://github.com/kevzlou7979/Srp4Gwt.
Implementation of the Secure Remote Password protocol for GWT.
It is necessary to always use SSL together with SRP since a man-in-the-middle could otherwise inject custom javascript that gets the password directly from the user.
Do not use trust this code without carefully verifying that the implementation is in fact correct.
See com.github.legioth.srp4gwt.demo for an example of how to use the module.
You need to download version 2.3.0 of https://code.google.com/p/gwt-crypto/ and include it on you classpath.