Constant torut::onion::TORV3_SECRET_KEY_LENGTH

pub const TORV3_SECRET_KEY_LENGTH: usize = ed25519_dalek::EXPANDED_SECRET_KEY_LENGTH; // 0x0_000_000_000_000_040usize

Standardises usage of Tor V3 secret keys, which is 65 bytes (equal to Ed25519 extended secret key length)