message: expose the errors too
diff: @@ -13,7 +13,7 @@ mod kes;
  mod key;
  mod sign;
  -pub use key::{AsymmetricKey, PublicKey, SecretKey};
  +pub use key::{AsymmetricKey, PublicKey, PublicKeyError, SecretKey, SecretKeyError};
  pub use sign::Signature;
  pub use algorithms::*;
  