Function openpgp_card_sequoia::sq_util::decryption_helper

pub fn decryption_helper<D>(
    d: D, 
    msg: Vec<u8>, 
    p: &dyn Policy
) -> Result<Vec<u8>> where
    D: VerificationHelper + DecryptionHelper, 

Produce decrypted plaintext from a VerificationHelper+DecryptionHelper d and the ciphertext msg.