Signer that uses a given KeyStore.PrivateKeyEntry to sign documents.
Create the memory signer. Required parameters are the
displayName and the
KeyStore.PrivateKeyEntry used by this signer. Subclasses have to override this and have to make sure to call the provided
PrivateKeySigner.OnPrivateKeyLoadedCallback whenever private key is ready. The method might be called with a LoadingFeedbackListener which should be
used by the implementation to notify of important events (e.g. password required, key loading complete, etc.).
||An optional password that should be used to load the private key.
||A LoadingFeedbackListener to be notified of important loading events, or
||An OnPrivateKeyLoadedCallback that should be called once the private key has been loaded.