law sha1_streaming

bend-osdev-hashes@0.1.0.0 · LAWS.bend:153

import Base
import bend-osdev-bytes@0.1.0.0/bytes.bend as B
import bend-osdev-hashes@0.1.0.0/hashes.bend as Hs
import bend-osdev-hashes@0.1.0.0/sha1.bend as S1

153# SHA-1 (FIPS 180-4): update over a ++ b is update over a, then b, from every state
154law sha1_streaming:
155  for s: Hs.HsMdState<Hs.HsW5>
156  for +a: B.Octets
157  for +b: B.Octets
158  {S1.HsSha1.update(s, B.Octets.append(a, b)) == S1.HsSha1.update(S1.HsSha1.update(s, a), b) : Hs.HsMdState<Hs.HsW5>}