PROOF.des_step_unstep: 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 177-181 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=177&end_line=181

import Base
import bend-osdev-legacy-ciphers@0.1.0.0/des.bend as D

def des_step_unstep(+k: D.LcDesRk, h: D.LcDesHalves) -> {h == D.des.step(k, D.des.unstep(k, h)) : D.LcDesHalves}:
  match h:
    case D.LcDesHalves{+a, b}:
      %u32_xx(b, D.des.f(k, a)) : {D.LcDesHalves{a, b} == D.LcDesHalves{a, _} : D.LcDesHalves}
      {==}

Uses (6):
  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/des.bend&name=LcDesHalves
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-legacy-ciphers@0.1.0.0/des.bend&name=LcDesRk
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-legacy-ciphers@0.1.0.0/des.bend&name=des.f
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-legacy-ciphers@0.1.0.0/des.bend&name=des.step
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-legacy-ciphers@0.1.0.0/des.bend&name=des.unstep