hashing understanding data

i need dive names logins users uat database have. (because information word act)

however, there catch.

the testers still need means login controlling hashed login names

so user login "jesse.j.james" following crush should something like

ypois.x.qasdf

i.e. approximately same length, dots same place

so md5, sha1 etc suitable emanate unequivocally enlarged strings also supplement possess special characters such + = certified validation regex.

so i'm looking suggestions grasp this

i speculation i need rollmy possess hashing algorith

anyone finished anything similar?

i am controlling c# nonetheless i speculation vicious algorithm

thanks alot

added -

thanks answers. i cruise i am grateful difficulty controlling "hash" indispensable done