def checked

bend-collections-laws-crypto@1.0.0.0 · spec/crypto/blake/blake2s.bend:215

import Base

215def checked(+r: Nat, valid: Bool, a: Array<U32>, ll: Nat) -> Maybe<&1,Array<U32>>:
216  match valid:
217    case False{}: None{}
218    case True{}: Some{digest(hash(r, a, ll))}