def ad.es.e
import bend-osdev-aead@0.1.0.0/essiv.bend as Essivimport Base
import bend-osdev-bytes@0.1.0.0/bytes.bend as B
25def ad.es.e(~KS: Data, ~Blk: Data, ~enc: KS -> Blk -> Blk, ~blk_to: Blk -> B.Octets, +ks: KS, x: Maybe<&2, Blk>, +iv: B.Octets) -> B.Octets:
26 match x:
27 case None{}:
28 iv
29 case Some{b}:
30 blk_to(enc(ks, b))