public void setUp()
{
recipient256 = new Recipient();
recipient256.AddAttribute(HeaderKeys.Algorithm, AlgorithmValues.Direct, Attributes.UNPROTECTED);
CBORObject key256 = CBORObject.NewMap();
key256.Add(CoseKeyKeys.KeyType, GeneralValues.KeyType_Octet);
key256.Add(CoseKeyParameterKeys.Octet_k, CBORObject.FromObject(rgbKey256));
cnKey256 = new OneKey(key256);
recipient256.SetKey(cnKey256);
}