substr(md5(md5($pass)))

Hi all,

Would it be possible to have added an algorithm that does substr(md5(md5($pass))) ?

It's basically for StuffIt 5 hashes, that are stored as a 40-bit cut from the 160-bit result of double-hashing the password with MD5.

I've seen the feature request from several years ago and even tried to add it myself basing on md5(md5($pass)) code, but I don't get where the code should be added to :p

Thanks in advance.