private void addUserButton_Click(object sender, RoutedEventArgs e)
        {
            CryptoApiRandomGenerator randomGenerator = new CryptoApiRandomGenerator();
            SecureRandom secureRandom = new SecureRandom(randomGenerator);
            var keyGenerationParameters = new KeyGenerationParameters(secureRandom, RsaKeySize);

            var keyPairGenerator = new RsaKeyPairGenerator();
            keyPairGenerator.Init(keyGenerationParameters);
            AsymmetricCipherKeyPair keyPair = keyPairGenerator.GenerateKeyPair();
            var password = Encoding.ASCII.GetBytes(pass.Password);
            var userName = user.Text;

            Stream out1 = File.Create(@".\prywatne\" + userName);
            Stream out2 = File.Create(@".\publiczne\" + userName);

            ExportKeyPair(out1, out2, keyPair.Public, keyPair.Private, userName, password, true);

            out1.Close();
            out2.Close();

            user.Text = "";
            pass.Password = "";
            this.Close();
        }
        private static void ExportKeyPair(
            Stream secretOut,
            Stream publicOut,
            AsymmetricKeyParameter publicKey,
            AsymmetricKeyParameter privateKey,
            string identity,
            byte[] passPhrase,
            bool armor)
        {

            SHA256 hashMachine = SHA256Managed.Create();
            byte[] passHash = hashMachine.ComputeHash(passPhrase);
            PgpSecretKey secretKey = new PgpSecretKey(
                PgpSignature.DefaultCertification,
                PublicKeyAlgorithmTag.RsaGeneral,
                publicKey,
                privateKey,
                DateTime.UtcNow,
                identity,
                SymmetricKeyAlgorithmTag.Blowfish,
                Encoding.ASCII.GetChars(passHash),
                null,
                null,
                new SecureRandom()
                );

            secretKey.Encode(secretOut);

            if (armor)
            {
                secretOut.Close();
                publicOut = new ArmoredOutputStream(publicOut);
            }

            PgpPublicKey key = secretKey.PublicKey;

            key.Encode(publicOut);

            if (armor)
            {
                publicOut.Close();
            }
        }