PasswordDigest authentication in WCF

WS-Security UsernameToken Profile describes how a client can authenticate to a web service using a "username" and a password. Two variations of the password are defined as part of the specification which includes "PasswordText" and "PasswordDigest". Neither WCF nor WIF out of box support "PasswordDigest" however there are some interop scenarios which might require "PasswordDigest". For example,