Hello guys,

Do you know any SHA-256 binary hash calculator, like this online one:

https://cryptii.com/hash-function

The goal is to create my own seed from 256 bits generate with a dice, then to the binary sha-256 hash in order to find the last 8 bits (checksum) for my seed.

For obvious security reasons, I want to use a old, offline computer using tails live-cd.

Thanks,