def olen
import bend-collections-laws-crypto@1.0.0.0/proofs/crypto/aead/chacha20poly1305.bend as Chacha20poly1305import Base
import bend-collections-laws-crypto@1.0.0.0/spec/crypto/chacha20poly1305.bend as R
243def olen(+key: List<&2, U32>, +nonce: List<&2, U32>, +aad: List<&2, U32>, +d: List<&2, U32>, short: Bool) -> Maybe<&2, List<&2, U32>>:
244 R.open_len(short, key, nonce, aad, d)