On a related note, I've once had to reproducibly generate a random sequence of N-bytes, and one of the more elegant ways I discovered and ended up using was to 'encrypt' a known sequence of bytes with the required length (so that the sequence will be long enough) with some known 'password', and truncating it.

`( yes '00' | head -n 100000 | tr -d $'\n') | xxd -r -p | aespipe -e AES256 -P <(echo 'your-seed')`