Retrieves the original (encapsulated) object.

The encapsulated object is unsealed (using the given Cipher, assuming that the Cipher is already properly initialized) and de-serialized, before it is returned.

Parameters:

c

the cipher used to unseal the object

Returns:  the original object.

Exceptions:

NullPointerException		if the given cipher is null.
IOException		if an error occurs during de-serialiazation
ClassNotFoundException		if an error occurs during de-serialiazation
IllegalBlockSizeException		if the given cipher is a block cipher, no padding has been requested, and the total input length is not a multiple of the cipher's block size
BadPaddingException		if the given cipher has been initialized for decryption, and padding has been specified, but the input data does not have proper expected padding bytes