law tdes_cbc_round_trip

bend-osdev-crypto@0.1.0.0 · LAWS.bend:691

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/tdes.bend as T
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

691# Triple DES (legacy-ciphers) in CBC (modes.bend): decryption undoes encryption, for every key, IV and list of blocks
692law tdes_cbc_round_trip:
693  for +k: T.LcTdesKey
694  for +iv: L.LcBlock64
695  for +bs: List<&2, L.LcBlock64>
696  {Md.CrCbc.decrypt_blocks(~T.LcTdesKey, ~L.LcBlock64, ~T.LcTdes.decrypt, ~LC.CrBlk64.xor, k, iv, Md.CrCbc.encrypt_blocks(~T.LcTdesKey, ~L.LcBlock64, ~T.LcTdes.encrypt, ~LC.CrBlk64.xor, k, iv, bs)) == bs : List<&2, L.LcBlock64>}