We should support [phc password storage](https://github.com/P-H-C/phc-string-format/blob/master/phc-sf-spec.md) as described in [OWASP Password Storage Cheat Sheet](https://cheatsheetseries.owasp.org/cheatsheets/Password_Storage_Cheat_Sheet.html#upgrading-legacy-hashes).
