private void DCGenerateCertificateButton_Click(object sender, RoutedEventArgs e)
        {
            //Create a RSAWrapper object using the dropdown box selection.
            RSAWrapper envelopeRsaAlgorithm = new RSAWrapper(DCEnvelopeRsaDropdown.SelectedItem.ToString());
            //Create a CipherMode object using the dropdown box selection.
            CipherMode cipherMode = HelperExtensions.StringToCipherMode(DCEnvelopeCipherDropdown.SelectedItem.ToString());
            //Create a SymmetricAlgorithmWrapper object using the dropdown box selection and the CipherMode object.
            SymmetricAlgorithmWrapper symmetricAlgorithmType = HelperExtensions.StringToSymAlg(DCEnvelopeSymDropdown.SelectedItem.ToString(), cipherMode, DCEnvelopeCipherDropdown.SelectedItem.ToString());

            //Create a DigitalEnvelope object using the dropdown box selection, the SymmetricAlgorithmWrapper object and the RSAWrapper object.
            DigitalEnvelope digitalEnvelope = new DigitalEnvelope(symmetricAlgorithmType, envelopeRsaAlgorithm, DCInputTextBox.Text);
            //Decrypt the envelope.
            DigitalEnvelopeEncrypted result = digitalEnvelope.CreateEnvelope();

            //Create a HashAlgorithmName object using the dropdown box selection.
            HashAlgorithmName hashAlgorithmName = HelperExtensions.StringToHashAlgorithm(DCSignatureHashDropdown.SelectedItem.ToString());
            //Create a RSAWrapper object using the dropdown box selection and the HashAlgorithmName object.
            RSAWrapper rsaAlgorithm = new RSAWrapper(DCSignatureRsaDropdown.SelectedItem.ToString(), hashAlgorithmName);
            //Create a DigitalSignature object using the RSAWrapper object and the encrypted envelope data.
            DigitalSignature digitalSignature = new DigitalSignature(rsaAlgorithm, result.EncryptedDataKeyPair());

            //Create a signature for the encrypted envelope data.
            digitalSignature.CreateSignature();
            DCInputTextBlock.Text = "Certificate generated successfully!";
        }
        //Generate a digital envelope.
        private void DEGenerateButton_Click(object sender, RoutedEventArgs e)
        {
            //Create a CipherMode object using the dropdown box selection.
            CipherMode cipherMode = HelperExtensions.StringToCipherMode(DESymTypeDropdown.SelectedItem.ToString());
            //Create a SymmetricAlgorithmWrapper object using the dropdown box selections and the CipherMode object.
            SymmetricAlgorithmWrapper symmetricAlgorithmType = HelperExtensions.StringToSymAlg(DESymDropdown.SelectedItem.ToString(), cipherMode, DESymTypeDropdown.SelectedItem.ToString());
            //Create a RSAWrapper object using the dropdown box selection.
            RSAWrapper rsaAlgorithm = new RSAWrapper(DERsaDropdown.SelectedItem.ToString());

            DigitalEnvelope digitalEnvelope = new DigitalEnvelope(symmetricAlgorithmType, rsaAlgorithm, DEInputTextBox.Text);

            digitalEnvelope.CreateEnvelope();
            DEInputTextBlock.Text = "Envelope generated successfully!";
        }