law hmac_crc32_split

bend-osdev-crypto@0.1.0.0 · LAWS.bend:1185

import Base
import bend-osdev-bytes@0.1.0.0/bytes.bend as B
import bend-osdev-crc@0.1.0.0/crc.bend as C
import bend-osdev-crypto@0.1.0.0/hmac.bend as Hm
import bend-osdev-crypto@0.1.0.0/inst_crc.bend as CR

1185# HMAC over CRC-32 of any parameter set (crc): the tag in pieces is the tag in one call, for every split
1186law hmac_crc32_split:
1187  for ~spec: C.Crc32Spec
1188  for +kk: Hm.CrHmacKey
1189  for +a: B.Octets
1190  for +b: B.Octets
1191  {Hm.CrHmac.finish(~U32, ~CR.CrCrc32.init(~spec), ~CR.CrCrc32.update(~spec), ~CR.CrCrc32.final(~spec), Hm.CrHmac.update(~U32, ~CR.CrCrc32.update(~spec), Hm.CrHmac.update(~U32, ~CR.CrCrc32.update(~spec), Hm.CrHmac.start(~U32, ~CR.CrCrc32.init(~spec), ~CR.CrCrc32.update(~spec), kk), a), b)) == Hm.CrHmac.mac(~CR.CrCrc32.digest(~spec), kk, B.Octets.append(a, b)) : B.Octets}