If token is null, generate the initial SASL message to send to the server.
(This will be null if the client doesn't initiate the exchange.) Otherwise, token is a
challenge from the server, and the return value is the response.
Free the returned ByteArray with g_byte_array_free.
| this |
a Sasl |
| token |
a token, or null |
| cancellable |
optional Cancellable object, or null |
|
the SASL response or null. If an error occurred, throws will also be set. |