PROOF.fe_unstep_step: def of bend-osdev-legacy-ciphers@0.1.0.0
Import: import bend-osdev-legacy-ciphers@0.1.0.0/PROOF.bend as PROOF
Lines 1421-1425 of bend-osdev-legacy-ciphers@0.1.0.0/PROOF.bend: https://jend.leeeet.dev/read.txt?path=bend-osdev-legacy-ciphers@0.1.0.0/PROOF.bend&start_line=1421&end_line=1425

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

def 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}:
  match b:
    case L.LcBlock64{l, +r}:
      %u32_xx(l, f(k, r)) : {L.LcBlock64{l, r} == L.LcBlock64{_, r} : L.LcBlock64}
      {==}

Uses (5):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-legacy-ciphers@0.1.0.0/PROOF.bend&name=u32_xx
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-legacy-ciphers@0.1.0.0/legacy_ciphers.bend&name=LcBlock64
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-legacy-ciphers@0.1.0.0/legacy_ciphers.bend&name=lc.fe.step
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-legacy-ciphers@0.1.0.0/legacy_ciphers.bend&name=lc.fe.unstep