def block_body
import bend-collections@1.0.0.0/src/crypto/chacha/chacha20.bend as Chacha20import Base
91def block_body(+r: Nat, key_bytes: List<&2, U32>, counter: U32, nonce_bytes: List<&2, U32>) -> List<&2, U32>:
92 keystream(r, key(key_bytes), counter, nonce(nonce_bytes))