def fe_unstep_step

bend-osdev-legacy-ciphers@0.1.0.0 · PROOF.bend:1421

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

1421def fe_unstep_step(~RK: Data, ~f: RK -> U32 -> U32, +k: RK, b: L.LcBlock64) -> {b == L.lc.fe.unstep(~RK, ~f, k, L.lc.fe.step(~RK, ~f, k, b)) : L.LcBlock64}:
1422  match b:
1423    case L.LcBlock64{l, +r}:
1424      %u32_xx(l, f(k, r)) : {L.LcBlock64{l, r} == L.LcBlock64{_, r} : L.LcBlock64}
1425      {==}