Unwrap a previously wrapped key.

Parameters:

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

Returns:  the unwrapped key.

Exceptions:

IllegalStateException		if this cipher is in a wrong state (e.g., has not been initialized).
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.