def fe_step_unstep

bend-osdev-legacy-ciphers@0.1.0.0 · PROOF.bend:1427

import Base
import bend-osdev-legacy-ciphers@0.1.0.0/legacy_ciphers.bend as L

1427def fe_step_unstep(~RK: Data, ~f: RK -> U32 -> U32, +k: RK, b: L.LcBlock64) -> {b == L.lc.fe.step(~RK, ~f, k, L.lc.fe.unstep(~RK, ~f, k, b)) : L.LcBlock64}:
1428  match b:
1429    case L.LcBlock64{+l, r}:
1430      %u32_xx(r, f(k, l)) : {L.LcBlock64{l, r} == L.LcBlock64{l, _} : L.LcBlock64}
1431      {==}