law fcrypt_block_round_trip_dual

bend-osdev-crypto@0.1.0.0 · LAWS.bend:1119

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/fcrypt.bend as Fc

1119# FCrypt (legacy-ciphers): encryption undoes decryption (a permutation of the blocks)
1120law fcrypt_block_round_trip_dual:
1121  for k: Fc.LcFcryptKey
1122  for +b: L.LcBlock64
1123  {Fc.LcFcrypt.encrypt(k, Fc.LcFcrypt.decrypt(k, b)) == b : L.LcBlock64}