TOTP SHA256/512 possible?

[hvisage]

Busy working with Kanidm https://kanidm.com/ and it uses (as I've started to notice elsewhere too) SHA256... and I've seen references to SHA512 TOTPs too. Elsewhere I've noticed 8 digits option too.

Is there enough code space for SHA256? and 512?
What would be required to implement?

Example Config string from Kanidm credential settings page

otpauth://totp/Envisage%20Cloud%20Solutions:hv?secret=YBO5RLEX4O5PTWIOKTHNGZDDNK7R7WPYIXMAUC324YUX4OYK3G4Q&issuer=Envisage%20Cloud%20Solutions&algorithm=SHA256&digits=6&period=30

TOTP details

• Secret: YBO5RLEX4O5PTWIOKTHNGZDDNK7R7WPYIXMAUC324YUX4OYK3G4Q
• Algorithm: SHA256
• Time Steps: 30 sec
• Code size: 6 digits

[hvisage]

Okay, just now realized I haven't searched for closed tickets, and see #101

I do know that there aren't known issues with 6digit SHA1, but the "issues" with SHA1 is making people insist on SHA256/512... and to prevent brute force, 8digits is also being "requested" elsewhere for custom websites. I don't expect the "big" websites to change soon, but I've been noticing these subtle SHA256 and 8digit on internal applications that is important/daily use for me (at least) and why I'd like Onlykey to support it please..