I don't see why you'd want to do this. You want to keep the username in plain text for many reasons, and hash the password for security reasons. If you put them

I don't see why you'd want to do this. You want to keep the username in plain text for many reasons, and hash the password for security reasons. If you put them together you either keep it in plain text and lose security, or hash it properly and lose the ability to display usernames in your site.