def sp.eta

bend-osdev-cipher-modes@0.1.0.0 · PROOF.bend:134

import Base
import bend-osdev-cipher-modes@0.1.0.0/cipher_modes.bend as M

134def sp.eta(s: M.CmSplit) -> {M.CmSplit{M.cm.split.blocks(s), M.cm.split.tail(s)} == s : M.CmSplit}:
135  match s:
136    case M.CmSplit{bs, t}:
137      {==}