using System;

using System.Security.Cryptography;

using System.Text;

public class Program

{

    public static string Encrypt(string publicKeyXML, string input, int keySize , bool fOAEP)

        {

            using (var rsa = new RSACryptoServiceProvider(keySize))

            {

                rsa.FromXmlString(publicKeyXML);

                var inputBytes = Encoding.UTF8.GetBytes(input);

                var encrypted = rsa.Encrypt(inputBytes, fOAEP);

                return Convert.ToBase64String(encrypted);

            }

        }

    public static void Main()

    {

        //KS_PARAMETER tablosunda PARAMETER_CODE degeri "FOX_SERVICE_USERNAME" olan kayıt.

        var userName = "BOSS_FOX_TST";

        //KS_PARAMETER tablosunda PARAMETER_CODE degeri "FOX_SERVICE_PASSWORD" olan kayıt.

        var password = "123Qwe.,";

        //KS_PARAMETER tablosunda PARAMETER_CODE degeri "FOX_SERVICE_KEY" olan kayıt.

        var puclicKey = "<RSAKeyValue><Modulus>uPhkjYB1hmZm+TKeW+JXJjvVGU2pcrPHFrnEX2+ejQthAQHXExjedXNt3e9NCQAzlBunksVBmzQU04qB8XyfwYu+S6asZxGDetd7p7fH6eK/fwu9+YHAcKXH3e0jyKuHKPKuc9EWMV2p3yOnkc5lBlBCn6/U+C0h3YTOYiF7IzJSzEVH7SK/BAArUIikKobJ346ekz1xXfN1srmSNPC6bJrXj8DkWQi8kh36JY0OsKNNxEOtVIVfUBkPn959TQG27HPCumdq1UTtYRLA0asG/Z8uouWITpSo9I3h0z/W4cq/rN/rSXgrPYF0TePhm7IRHY10P19kV+EHaBrRSRvByw==</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";

        //Password degerini yukarıdaki Encrypt fonksinu ile şifrelememiz gerekmekte.

        Console.WriteLine("UserName : "+userName +"\nPassWord : "+ Encrypt(puclicKey, password, 2048, true));

    }

}