[Django]-Django Override password encryption

In Django, the way user is authenticated is not done in the User model itself. Django uses other modules to do just that. In your case you can create your custom module for checking the password and add it in your settings.py (docs).

One cool thing about Django is that you can supply multiple of these hashers to do that auth. Lets say your current hash method is not as secure as some of the methods Django uses. Then if you add your custom hasher to the bottom of PASSWORD_HASHERS, the following can happen. If the user’s password who is trying to login is stored using your custom method, then Django will try the first hasher and it will fail. Then it will try the rest of the hashes and they all will fail except your custom hasher. However since the user is successfully authenticated and since the successful hasher is not the first hasher then Django will automatically rehash the password using the first defined hasher. This way you can gracefully upgrade to a more secure hash algorithm for the passwords as users keep logging in.

Also if you are migrating your current database and the users table does not match the Django user model, keep in mind that starting with Django 1.5, you can define your custom User model instead of Django’s.