Available as part of Hashing extension.
let data: Data
let hex = data.hex.encode()
let hash64FromData: Data = try data.hashing.xx64()
let hash64FromHex: Data = try hex.hashing.xx64()
// hash64FromData == hash64FromHex
let hash128FromData: Data = try data.hashing.xx128()
let hash128FromHex: Data = try hex.hashing.xx128()
// hash128FromData == hash128FromHex
let hash256FromData: Data = try data.hashing.xx256()
let hash256FromHex: Data = try hex.hashing.xx256()
// hash256FromData == hash256FromHex