law sha1_hash_streaming

bend-osdev-crypto@0.1.0.0 · LAWS.bend:1308

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 HS1

1308# SHA-1 (hashes): update over a ++ b is update over a, then b, for every state
1309law sha1_hash_streaming:
1310  for s: Hs.HsMdState<Hs.HsW5>
1311  for +a: B.Octets
1312  for +b: B.Octets
1313  {HS1.HsSha1.update(s, B.Octets.append(a, b)) == HS1.HsSha1.update(HS1.HsSha1.update(s, a), b) : Hs.HsMdState<Hs.HsW5>}