license-generator/Commands/KeygenCommand.cs

using System;
using System.IO;
using System.Security.Cryptography;

namespace LicenseGenerator.Commands
{
    internal static class KeygenCommand
    {
        internal static void Execute()
        {
            using (var rsa = new RSACryptoServiceProvider(2048))
            {
                string privateXml = rsa.ToXmlString(true);
                string publicXml  = rsa.ToXmlString(false);
                File.WriteAllText("private.key.xml", privateXml);
                Console.WriteLine("=== PUBLIC KEY XML -- paste into LicenseValidator.cs ===");
                Console.WriteLine(publicXml);
                Console.WriteLine("========================================================");
                Console.WriteLine("Private key saved: private.key.xml");
                Console.WriteLine("KEEP private.key.xml SECRET -- never distribute it.");
            }
        }
    }
}