law serpent_pcbc_round_trip

bend-osdev-crypto@0.1.0.0 · LAWS.bend:822

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/pcbc.bend as Pc
import bend-osdev-crypto@0.1.0.0/inst_cm.bend as CM

822# Serpent (legacy-ciphers) in PCBC (pcbc.bend): decryption undoes encryption, for every key, IV and list of blocks
823law serpent_pcbc_round_trip:
824  for +k: Sp.LcSerpentKey
825  for +iv: M.CmBlock
826  for +bs: List<&2, M.CmBlock>
827  {Pc.CrPcbc.decrypt_blocks(~Sp.LcSerpentKey, ~M.CmBlock, ~Sp.LcSerpent.decrypt, ~CM.CrBlk128.xor, k, iv, Pc.CrPcbc.encrypt_blocks(~Sp.LcSerpentKey, ~M.CmBlock, ~Sp.LcSerpent.encrypt, ~CM.CrBlk128.xor, k, iv, bs)) == bs : List<&2, M.CmBlock>}