A {@code Hash} implementation that allows any {@link java.security.MessageDigest MessageDigest} algorithm name to be used. This class is a less type-safe variant than the other {@code AbstractHash} subclasses (e.g. {@link Sha512Hash}, etc), but it does allow for any algorithm name to be specified in case the other subclass implementations do not represent an algorithm that you may want to use. <p/> As of Shiro 1.1, this class effectively replaces the (now-deprecated) {@link AbstractHash} class. It subclasses {@code AbstractHash} only to retain backwards-compatibility.