law twofish_lrw_round_trip

bend-osdev-crypto@0.1.0.0 · LAWS.bend:873

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/twofish.bend as Tf
import bend-osdev-crypto@0.1.0.0/lrw.bend as Lw
import bend-osdev-gf@0.1.0.0/gf128.bend as G
import bend-osdev-crypto@0.1.0.0/inst_cm.bend as CM

873# Twofish (legacy-ciphers) in LRW (lrw.bend): decryption undoes encryption, for every key, tweak key, index and list of blocks
874law twofish_lrw_round_trip:
875  for +k: Tf.LcTwofishKey
876  for +k2: G.Gf128
877  for +i: G.Gf128
878  for +bs: List<&2, M.CmBlock>
879  {Lw.CrLrw.decrypt_blocks(~Tf.LcTwofishKey, ~M.CmBlock, ~Tf.LcTwofish.decrypt, ~CM.CrBlk128.xor, ~CM.CrBlk128.of_octets, k, k2, i, Lw.CrLrw.encrypt_blocks(~Tf.LcTwofishKey, ~M.CmBlock, ~Tf.LcTwofish.encrypt, ~CM.CrBlk128.xor, ~CM.CrBlk128.of_octets, k, k2, i, bs)) == bs : List<&2, M.CmBlock>}