def expand_key

bend-collections-laws-crypto@1.0.0.0 · src/crypto/aes/aes.bend:170

import Base

170# A 16-, 24- or 32-byte key (AES-128, AES-192, AES-256); None otherwise.
171def expand_key(+key: List<&2, U32>) -> Maybe<&2, Schedule>:
172  +n = List.length(&2, U32, key)
173  schedule_if(valid_length(n), Nat.div(n, 4n), key)