Sorry for asking the same question a few years later!! I have the same issue here and I didn't want to open a new thread for it.
Just to be sure here, I didn't understand if you are saying that the migration of the encrypted passwords is NOT possible in mysql databases, or if I can copy the encrypted password of a user to the password field in my database and then the user can login with his/her unencrypted password after authentication??
I'm sorry if my question is trivial, I just have to study so I don't mess up my clients' accounts!