SHA-256 is the recommended stronger alternative to SHA-1. See FIPS PUB 180-4 for implementation details.

Either by using a dedicated library or implementing the algorithm in your language, show that the SHA-256 digest of the string "Rosetta code" is: 764faf5c61ac315f1497f9dfa542713965b785e5cc2f707d6468d7d1124cdfcf

import Data.Char (ord)
import Crypto.Hash.SHA256 (hash)
import Data.ByteString (unpack, pack)
import Text.Printf (printf)
 
main = putStrLn $                     -- output to terminal
       concatMap (printf "%02x") $    -- to hex string
       unpack $                       -- to array of Word8
       hash $                         -- SHA-256 hash to ByteString
       pack $                         -- to ByteString
       map (fromIntegral.ord)         -- to array of Word8
       "Rosetta code"
 