LAWS.feistel_unrun_run: law of bend-osdev-cipher-core@0.1.0.0
Import: import bend-osdev-cipher-core@0.1.0.0/LAWS.bend as LAWS
Lines 63-70 of bend-osdev-cipher-core@0.1.0.0/LAWS.bend: https://jend.leeeet.dev/read.txt?path=bend-osdev-cipher-core@0.1.0.0/LAWS.bend&start_line=63&end_line=70

import Base
import bend-osdev-cipher-core@0.1.0.0/cipher_core.bend as L

# Feistel rounds over any round function f and any round keys: the rounds
# undone last to first undo the rounds, and the other way round
law feistel_unrun_run:
  for ~RK: Data
  for ~f: RK -> U32 -> U32
  for ks: List<&2, RK>
  for +b: L.LcBlock64
  {b == L.lc.fe.unrun(~RK, ~f, ks, L.lc.fe.run(~RK, ~f, ks, b)) : L.LcBlock64}

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-cipher-core@0.1.0.0/PROOF.bend&name=fe_unrun_run
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-cipher-core@0.1.0.0/cipher_core.bend&name=LcBlock64
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-cipher-core@0.1.0.0/cipher_core.bend&name=lc.fe.run
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-cipher-core@0.1.0.0/cipher_core.bend&name=lc.fe.unrun