law cast6_cbc_round_trip

bend-osdev-crypto@0.1.0.0 · LAWS.bend:947

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/cast6.bend as C6
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

947# CAST-256 (legacy-ciphers) in CBC (modes.bend): decryption undoes encryption, for every key, IV and list of blocks
948law cast6_cbc_round_trip:
949  for +k: C6.LcCast6Key
950  for +iv: M.CmBlock
951  for +bs: List<&2, M.CmBlock>
952  {Md.CrCbc.decrypt_blocks(~C6.LcCast6Key, ~M.CmBlock, ~C6.LcCast6.decrypt, ~CM.CrBlk128.xor, k, iv, Md.CrCbc.encrypt_blocks(~C6.LcCast6Key, ~M.CmBlock, ~C6.LcCast6.encrypt, ~CM.CrBlk128.xor, k, iv, bs)) == bs : List<&2, M.CmBlock>}