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

native java.security.MessageDigest
 
def sha256Java( message ) = map( a -> format('%02x', a), list(MessageDigest.getInstance('SHA-256').digest(message.getBytes('UTF-8'))) ).mkString()