Derive a key from another key.
This call may block for an indefinite period.
| this |
The session to use. |
| mechanism |
The mechanism to use for derivation. |
| attrs |
Additional attributes for the derived key. |
| cancellable |
Optional cancellation object, or null. |
| base |
The key to derive from. |
|
the new derived key or null if the operation failed |