Is there an SHA224 implementation for .Net?

Question

Does .Net have a built-in implementation of SHA224 available for use or a way to get one of the existing .Net SHA implementations to do 224?

I found this blog post which seems to suggest there isn't and won't be a Microsoft implementation of SHA224 so does anyone know of a good 3rd party implementation?

Any solution that relies on P/Invoke is not acceptable as needs to be fully managed code as I need to support multiple platforms (.Net, Silverlight, Windows Phone and Mono)

Answer 1

Check out this project on codeplex: http://hashlib.codeplex.com/SourceControl/changeset/view/60118#514361