law bytes_length
import bend-collections-laws-crypto@1.0.0.0/proofs/crypto/chacha/stream.bend as Streamimport Base
import bend-collections-laws-crypto@1.0.0.0/src/crypto/chacha/core.bend as C
151# 64 keystream bytes.
152law bytes_length:
153 for +s: C.State
154 {List.length(&2, U32, C.bytes(s)) == 64n : Nat}