Gck.Session.derive_key_async

### Method

# Gck Sessionderive_key_async

#### Declaration [src]

    void
    gck_session_derive_key_async (
      GckSession* self,
      GckObject* base,
      GckMechanism* mechanism,
      GckAttributes* attrs,
      GCancellable* cancellable,
      GAsyncReadyCallback callback,
      gpointer user_data
    )

#### Description [src]

Derive a key from another key. This call will return immediately and complete asynchronously.

If the `attrs` `GckAttributes` is floating, it is consumed.

This method completes asynchronously. Use `gck_session_derive_key_finish()` inside the `GAsyncReadyCallback` to obtain the result of the operation.

#### Parameters

`base`

  Type: `GckObject`

  The key to derive from.

  The data is owned by the caller of the method.

`mechanism`

  Type: `GckMechanism`

  The mechanism to use for derivation.

  The data is owned by the caller of the method.

`attrs`

  Type: `GckAttributes`

  Additional attributes for the derived key.

  The data is owned by the caller of the method.

`cancellable`

  Type: `GCancellable`

  Optional cancellation object or `NULL`.

  The argument can be `NULL`.
  The data is owned by the caller of the method.

`callback`

  Type: `GAsyncReadyCallback`

  Called when the operation completes.

  The argument can be `NULL`.

`user_data`

  Type: `gpointer`

  Data to pass to the callback.

  The argument can be `NULL`.
  The data is owned by the caller of the method.