(I am still also asking the SHA-256 hash of the script.)
What's this and how do I do it?
You could have googled to get instant answers but anyway nullius is asking you to encrypt the script file using SHA-256 encryption algo which you can effectively do it online using
https://hash.online-convert.com/sha256-generator if you're not very familiar with a command line tool.After conversion,you can send the HEX/base65 encoded generated hash to nullius.
I recommend
against using the linked tool. If text is pasted into a textarea widget, even one change in line breaks, etc. would change the output hash and make it irreproduceable. The only other option on that form appears to be a URL for a file hosted somewhere online. It appears that this form (?) sends the data to the server to be hashed (not sure).
I posted command-line invocations for both Linux and Windows.
(Nit: SHA-256 is not an encryption algorithm. It is a cryptographic hash. The objective is not to encrypt the script, but to put it through a one-way compression. There is no way to decrypt SHA-256. The process is only one-way.)