law des_pcbc_round_trip

bend-osdev-crypto@0.1.0.0 · LAWS.bend:662

import Base
import bend-osdev-legacy-ciphers@0.1.0.0/legacy_ciphers.bend as L
import bend-osdev-legacy-ciphers@0.1.0.0/des.bend as D
import bend-osdev-crypto@0.1.0.0/pcbc.bend as Pc
import bend-osdev-crypto@0.1.0.0/inst_lc.bend as LC

662# DES (legacy-ciphers) in PCBC (pcbc.bend): decryption undoes encryption, for every key, IV and list of blocks
663law des_pcbc_round_trip:
664  for +k: D.LcDesKey
665  for +iv: L.LcBlock64
666  for +bs: List<&2, L.LcBlock64>
667  {Pc.CrPcbc.decrypt_blocks(~D.LcDesKey, ~L.LcBlock64, ~D.LcDes.decrypt, ~LC.CrBlk64.xor, k, iv, Pc.CrPcbc.encrypt_blocks(~D.LcDesKey, ~L.LcBlock64, ~D.LcDes.encrypt, ~LC.CrBlk64.xor, k, iv, bs)) == bs : List<&2, L.LcBlock64>}