[keycloak-user] Update passwords with old hash algorithm

[Danny Trunk]

Hello everybody,

I've already implemented a custom Password Hash SPI which encodes and 
verifies encoded passwords with an old hash algorithm.
Now I would like to update those passwords with a new hash algorithm as 
I have access to the raw password in the Password Hash SPI (Keyword: 
self-healing process).

Which possibilities do I have?

Best regards
Danny.