LAWS.pkcs7_round_trip: law of bend-osdev-pkcs7@0.1.0.0
Import: import bend-osdev-pkcs7@0.1.0.0/LAWS.bend as LAWS
Lines 10-16 of bend-osdev-pkcs7@0.1.0.0/LAWS.bend: https://jend.leeeet.dev/read.txt?path=bend-osdev-pkcs7@0.1.0.0/LAWS.bend&start_line=10&end_line=16

import Base
import bend-osdev-bytes@0.1.1.0/bytes.bend as B
import bend-osdev-mode-core@0.1.0.0/mode_core.bend as M
import bend-osdev-pkcs7@0.1.0.0/pkcs7.bend as P

# Unpadding undoes padding, for every block size bs and message m: when bs
# is one the padding takes (1 to 255), unpad(pad(m)) is m; when it is not,
# both refuse alike (CmBadBlockSize)
law pkcs7_round_trip:
  for +bs: Nat
  for +m: B.Octets
  {Result.bind(&2, &2, M.CmError, B.Octets, B.Octets, P.Pkcs7.pad(bs, m), c => P.Pkcs7.unpad(bs, c)) == Result.map(&2, &2, M.CmError, B.Octets, B.Octets, c => m, P.Pkcs7.pad(bs, m)) : Result<&2, &2, M.CmError, B.Octets>}

Uses (10):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Result
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Result.bind
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Result.map
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-bytes@0.1.1.0/bytes.bend&name=Octets
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-mode-core@0.1.0.0/mode_core.bend&name=CmError
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-pkcs7@0.1.0.0/PROOF.bend&name=pk.rt
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-pkcs7@0.1.0.0/pkcs7.bend&name=Pkcs7.pad
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-pkcs7@0.1.0.0/pkcs7.bend&name=Pkcs7.unpad
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-pkcs7@0.1.0.0/pkcs7.bend&name=pkcs7.size_ok