def hash
import bend-collections@1.0.0.0/spec/crypto/secp256k1/ecdsa.bend as Ecdsaimport Base
import bend-collections@1.0.0.0/spec/crypto/keccak/main.bend as KS
277def hash(+h: Hash, a: Array<U32>, length: Nat) -> Maybe<&1, Array<U32>>:
278 match h:
279 case Keccak256{}: KS.keccak256_rounds(24n, a, length)