law serpent_cbc_round_trip

bend-osdev-crypto@0.1.0.0 · LAWS.bend:815

import Base
import bend-osdev-cipher-modes@0.1.0.0/cipher_modes.bend as M
import bend-osdev-legacy-ciphers@0.1.0.0/serpent.bend as Sp
import bend-osdev-crypto@0.1.0.0/modes.bend as Md
import bend-osdev-crypto@0.1.0.0/inst_cm.bend as CM

815# Serpent (legacy-ciphers) in CBC (modes.bend): decryption undoes encryption, for every key, IV and list of blocks
816law serpent_cbc_round_trip:
817  for +k: Sp.LcSerpentKey
818  for +iv: M.CmBlock
819  for +bs: List<&2, M.CmBlock>
820  {Md.CrCbc.decrypt_blocks(~Sp.LcSerpentKey, ~M.CmBlock, ~Sp.LcSerpent.decrypt, ~CM.CrBlk128.xor, k, iv, Md.CrCbc.encrypt_blocks(~Sp.LcSerpentKey, ~M.CmBlock, ~Sp.LcSerpent.encrypt, ~CM.CrBlk128.xor, k, iv, bs)) == bs : List<&2, M.CmBlock>}