Change the user's pin on this slot that this session is opened on.
This call will return immediately and completes asynchronously.
| this |
Change the PIN for this session's slot. |
| old_pin |
the user's old PIN, or null for protected authentication path |
| n_old_pin |
the length of the old PIN |
| new_pin |
the user's new PIN, or null for protected authentication path |
| cancellable |
Optional cancellation object, or null. |
| callback |
Called when the operation completes. |
| n_new_pin |
the length of the new PIN |
| user_data |
Data to pass to the callback. |