Get the number of seconds before the next retriable task is ready.
This number is specifically intended to be used as a timeout, where
`undef` means never time out.
Passwords that are sha1 will be transparently upgraded to argon2,
and future comparisons will use Argon2
Co-authored-by: Graham Christensen <graham@grahamc.com>
The default password comparison logic does not use
constant time validation. Switching to constant time
offers a meager improvement by removing a timing
oracle.
A prepatory step in moving to Argon2id password storage, since we'll need this change anyway after
for validating existing passwords.
Co-authored-by: Graham Christensen <graham@grahamc.com>
