law sm4_cbc_round_trip

bend-osdev-crypto@0.1.0.0 · LAWS.bend:727

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/sm4.bend as S
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

727# SM4 (legacy-ciphers) in CBC (modes.bend): decryption undoes encryption, for every key, IV and list of blocks
728law sm4_cbc_round_trip:
729  for +k: S.LcSm4Key
730  for +iv: M.CmBlock
731  for +bs: List<&2, M.CmBlock>
732  {Md.CrCbc.decrypt_blocks(~S.LcSm4Key, ~M.CmBlock, ~S.LcSm4.decrypt, ~CM.CrBlk128.xor, k, iv, Md.CrCbc.encrypt_blocks(~S.LcSm4Key, ~M.CmBlock, ~S.LcSm4.encrypt, ~CM.CrBlk128.xor, k, iv, bs)) == bs : List<&2, M.CmBlock>}