def secret_if
import bend-collections@1.0.0.0/src/crypto/secp256k1/schnorr.bend as Schnorrimport Base
91# the secret key d', when 1 <= d' < n
92def secret_if(+d: List<&2, Nat>, ok: Bool) -> Maybe<&2, List<&2, Nat>>:
93 match ok:
94 case True{}: Some{d}
95 case False{}: None{}