Check.toy.rot: def of bend-osdev-cbc@0.1.0.0
Import: import bend-osdev-cbc@0.1.0.0/check.bend as Check
Lines 65-73 of bend-osdev-cbc@0.1.0.0/check.bend: https://jend.leeeet.dev/read.txt?path=bend-osdev-cbc@0.1.0.0/check.bend&start_line=65&end_line=73

import Base
import bend-osdev-mode-core@0.1.0.0/mode_core.bend as M

# A toy permutation of blocks, NOT a cipher: the words rotated, then XOR
# with the key block. Enough to run the mode's code paths (encryption and
# decryption differ, so mixing them up shows); the mode is tested against
# its specification over AES in bend-osdev-aes-modes (the specifications'
# vectors) and in ref/ (against Python's cryptography).
def toy.rot(b: M.CmBlock) -> M.CmBlock:
  match b:
    case M.CmBlock{w0, w1, w2, w3}:
      M.CmBlock{w1, w2, w3, w0}

Uses (1):
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-mode-core@0.1.0.0/mode_core.bend&name=CmBlock