Unwrap a previously wrapped key.

This concrete method has been added to this previously-defined abstract class. (For backwards compatibility, it cannot be abstract.) It may be overridden by a provider to unwrap a previously wrapped key. Such an override is expected to throw an InvalidKeyException if the given wrapped key cannot be unwrapped. If this method is not overridden, it always throws an UnsupportedOperationException.

Parameters:

wrappedKey		the key to be unwrapped.
wrappedKeyAlgorithm		the algorithm associated with the wrapped key.
wrappedKeyType		the type of the wrapped key. This is one of SECRET_KEY, PRIVATE_KEY, or PUBLIC_KEY.

Returns:  the unwrapped key.

Exceptions:

NoSuchAlgorithmException		if no installed providers can create keys of type wrappedKeyType for the wrappedKeyAlgorithm.
InvalidKeyException		if wrappedKey does not represent a wrapped key of type wrappedKeyType for the wrappedKeyAlgorithm.