USE TURBO (shift-click the green flag) https://turbowarp.org/1377213596?fps=250&turbo (up to 25x faster) There are quite a lot of SHA256 Hash Generators on scratch, but my generator is built to handle multi-block infinite(computation time may vary) length messages that are case-sensitive. The hash of a million digits of pi sourced from https://www.piday.org/million/ is dd382ef6a0c1e8d920fb72f482d74826251ab97709520bc24f913cd8eb5fc839 (46.554s on turbowarp; 1235.548s on scratch)
Made this using the wikipedia article on sha-2 psuedocode from section: Hash Standard.