static fun forKey(key: Key!): AES256GCM! (source)
Pre-compute the expansion for the key.
Note that the returned instance of AES256GCM should be closed using #close() (or try-with-resources) to ensure timely release of the expanded key, which is held in native memory.
key - Key!: The key to precompute an expansion for.
UnsupportedOperationException - If AES256-GSM support is not available.