Can't crack salted hash generated by ruby AuthlogicSha512 library

[Dzam]

there is actual no mode (i think) in hashcat supporting this style of hash

Actually, I found some examples here.
This one for instance.

Code:

7400 sha256crypt $5$, SHA256 (Unix) 2 $5$rounds=5000$GX7BopJZJxPc/KEK$le16UF8I2Anb.rOrn22AUPWvzUETDGefUmAV8AZkGcD

And I tried it like this:

Code:

$6$rounds=20$salt$hash

But I had an error "Token length exception"
I already cloned the source code and I'll try to figure it out or maybe add a new method that let me crack such hashes.

EDIT: btw i think you mean nul or null not nil right?

No, I mean exactly nil. This is Ruby.

Code:

[2] pry(main)> 1 == nil
=> false
[3] pry(main)> nil.nil?
=> true
[4] pry(main)> nil.present?
=> false