[keycloak-user] Custom actions on a password, when an user change passwords?

Hello, I'm searching for a way to execute a custom action when an user defines or changes its password. The goal is to save the password in another format (the ultimate goal is being able to do scram/sha1 on the id of the users), while maintaining the normal operation of keycloak (we don't want to change the way keycloak stores its passwords, we just want a sort of copy). Does it ring a bell for someone in there? Do you know of a way to do that? Thanks, Rémy