using System;

using System.Security.Cryptography;

using System.Text;

public class Program

{

    public static void Main()

    {

        Random random = new Random();

        string PEMPub = "-----BEGIN RSA PUBLIC KEY-----MIIBCgKCAQEAwVNI1yXWaRUTlUuKsTQq0vnLCuoaSExlBx7djRMCkya0UNjhFGFOopMwJz7dHwR0YnHuteZqZbNn4/hkOoF1ggI0Kc9Ps9ZM2veAyDcnLt7mAa+xWPucUMQoW++W0MRxKu1jc37wGNoQaxx839zbkeCu8Wks4avPexyh5/eF3XdmWOspylTa2Z3RrU0fKXxa/mH9XfTqeH5b5MIlYF7R1jMW2n+w99GI/yhoMRDqy0O8Enaqq+D8yfP3yoh6bgvlTaovWdDBYIYk0weTaguLCEYF/4Q5HnwHgbtR6ckjiP2Oesye/E11wioQGvByZ9Na6W4wSm65ZIPd9z2+B5dZAQIDAQAB-----END RSA PUBLIC KEY-----";

​

        //added .AddHours(1) to compensate time zone difference

        var token = "4b07fce9-6015-4d20-a5ab-b9076d005d55" + "+" + DateTime.Now.AddHours(1).AddMinutes(2).ToString("yyyy-MM-dd HH:mm") + "+" + random.Next(100000000, 999999999);

        var encryptedData =  EncryptionHelper.encryptData(token, PEMPub);

​

        Console.WriteLine("encryptedData: " + encryptedData);

​

    }

}

​

 public class EncryptionHelper

    {

        private const int DW_KEY_SIZE = 2048;

​

        public static string decryptData(string encryptedData, string privateKey)

        {

            RSACryptoServiceProvider csp = new RSACryptoServiceProvider(DW_KEY_SIZE);

            csp.ImportFromPem(privateKey);

            var dataBytes = Convert.FromBase64String(encryptedData);

            return Encoding.UTF8.GetString(csp.Decrypt(dataBytes, false));

        }

​

        public static string encryptData(string data, string publicKey)

        {

            RSACryptoServiceProvider csp = new RSACryptoServiceProvider(DW_KEY_SIZE);

            csp.ImportFromPem(publicKey);

            var dataBytes = Encoding.UTF8.GetBytes(data);

            return Convert.ToBase64String(csp.Encrypt(dataBytes, false));

        }

    }