Function openpgp_card_sequoia::sq_util::private_subkey_by_fingerprint

pub fn private_subkey_by_fingerprint<'a>(
    cert: &'a Cert, 
    policy: &'a dyn Policy, 
    fingerprint: &str
) -> Result<Option<ValidErasedKeyAmalgamation<'a, SecretParts>>>

Retrieve a private (sub)key from a Cert, by fingerprint.