public RSAKeyPairModel(RSAParameters privateKey, RSAParameters publicKey)
        {
            if (privateKey.Equals(default(RSAParameters)) || publicKey.Equals(default(RSAParameters)))
            {
                throw new ArgumentException();
            }

            this._privateKey = RSAParametersModel.ConvertFromRSAParameters(privateKey);
            this._publicKey  = RSAParametersModel.ConvertFromRSAParameters(publicKey);
        }