Lists the keys in the currently-selected key ring.
The 'callback' parameter specifies a function which will be called when the operation completes (or an error is encountered). If the 'callback' parameter is not specified, then the method will block and will not return until the operation completes (or an error is encountered).
The callback for this method is defined as:
'err' is the error that occurred. If there was no error, then 'err' is 'null'.
'err' has 2 properties which hold detailed information:
This method lists the keys in the currently-selected KeyRing.
Calling this method will fire the KeyList event once for each key, and will also populate the Key* properties.
If there are still more keys available to list when this method returns, the KeyMarker property will be populated. Continue to call this method until KeyMarker is empty to accumulate all pages of results in the Key* properties.
The MaxKeys configuration setting can be used to control the maximum number of results to return at once.