Essiv.ad.es.e: def of bend-osdev-aead@0.1.0.0
Import: import bend-osdev-aead@0.1.0.0/essiv.bend as Essiv
Lines 25-30 of bend-osdev-aead@0.1.0.0/essiv.bend: https://jend.leeeet.dev/read.txt?path=bend-osdev-aead@0.1.0.0/essiv.bend&start_line=25&end_line=30

import Base
import bend-osdev-bytes@0.1.0.0/bytes.bend as B

def 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:
  match x:
    case None{}:
      iv
    case Some{b}:
      blk_to(enc(ks, b))

Uses (2):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.0/bytes.bend&name=Octets