law des_cbc_round_trip

bend-osdev-crypto@0.1.0.0 · LAWS.bend:655

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/modes.bend as Md
import bend-osdev-crypto@0.1.0.0/inst_lc.bend as LC

655# DES (legacy-ciphers) in CBC (modes.bend): decryption undoes encryption, for every key, IV and list of blocks
656law des_cbc_round_trip:
657  for +k: D.LcDesKey
658  for +iv: L.LcBlock64
659  for +bs: List<&2, L.LcBlock64>
660  {Md.CrCbc.decrypt_blocks(~D.LcDesKey, ~L.LcBlock64, ~D.LcDes.decrypt, ~LC.CrBlk64.xor, k, iv, Md.CrCbc.encrypt_blocks(~D.LcDesKey, ~L.LcBlock64, ~D.LcDes.encrypt, ~LC.CrBlk64.xor, k, iv, bs)) == bs : List<&2, L.LcBlock64>}