Callback (GNU cryptographic primitives and tools)
Keywords: javax.security.auth.callback.Callback,Callback interface

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## javax.security.auth.callback
Interface Callback

All Known Implementing Classes:
  AuthorizeCallback, ChoiceCallback, ConfirmationCallback, LanguageCallback, NameCallback, PasswordCallback, TextInputCallback, TextOutputCallback

public interface Callback

Implementations of this interface are passed to a `CallbackHandler`, allowing underlying security services the ability to interact with a calling application to retrieve specific authentication data such as usernames and passwords, or to display certain information, such as error and warning messages.

`Callback` implementations do not retrieve or display the information requested by underlying security services. `Callback` implementations simply provide the means to pass such requests to applications, and for applications, if appropriate, to return requested information back to the underlying security services.

See Also:
  `CallbackHandler`, `ChoiceCallback`, `ConfirmationCallback`, `LanguageCallback`, `NameCallback`, `PasswordCallback`, `TextInputCallback`, `TextOutputCallback`

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