law cast5_pcbc_round_trip

bend-osdev-crypto@0.1.0.0 · LAWS.bend:1034

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/cast5.bend as C5
import bend-osdev-crypto@0.1.0.0/pcbc.bend as Pc
import bend-osdev-crypto@0.1.0.0/inst_lc.bend as LC

1034# CAST-128 (legacy-ciphers) in PCBC (pcbc.bend): decryption undoes encryption, for every key, IV and list of blocks
1035law cast5_pcbc_round_trip:
1036  for +k: C5.LcCast5Key
1037  for +iv: L.LcBlock64
1038  for +bs: List<&2, L.LcBlock64>
1039  {Pc.CrPcbc.decrypt_blocks(~C5.LcCast5Key, ~L.LcBlock64, ~C5.LcCast5.decrypt, ~LC.CrBlk64.xor, k, iv, Pc.CrPcbc.encrypt_blocks(~C5.LcCast5Key, ~L.LcBlock64, ~C5.LcCast5.encrypt, ~LC.CrBlk64.xor, k, iv, bs)) == bs : List<&2, L.LcBlock64>}