using System.Collections.Generic; using System.IO; using System.Xml; using Packt.Shared; using static System.Console; using static System.IO.Path; using static System.Environment; namespace Exercise02 {   class Program   {     static void Main(string[] args)     {       WriteLine("You must enter a password to encrypt the sensitive data in the document.");       WriteLine("You must enter the same passord to decrypt the document later.");       Write("Password: ");       string password = ReadLine();       // define two example customers and       // note they have the same password       var customers = new List       {         new Customer         {           Name = "Bob Smith",           CreditCard = "1234-5678-9012-3456",           Password = "Pa$$w0rd",         },         new Customer         {           Name = "Leslie Knope",           CreditCard = "8002-5265-3400-2511",           Password = "Pa$$w0rd",         }       };       // define an XML file to write to       string xmlFile = Combine(CurrentDirectory,         "..", "protected-customers.xml");       var xmlWriter = XmlWriter.Create(xmlFile,         new XmlWriterSettings { Indent = true });       xmlWriter.WriteStartDocument();       xmlWriter.WriteStartElement("customers");       foreach (var customer in customers)       {         xmlWriter.WriteStartElement("customer");         xmlWriter.WriteElementString("name", customer.Name);         // to protect the credit card number we must encrypt it         xmlWriter.WriteElementString("creditcard",           Protector.Encrypt(customer.CreditCard, password));                  // to protect the password we must salt and hash it         // and we must store the random salt used         var user = Protector.Register(customer.Name, customer.Password);         xmlWriter.WriteElementString("password", user.SaltedHashedPassword);         xmlWriter.WriteElementString("salt", user.Salt);         xmlWriter.WriteEndElement();       }       xmlWriter.WriteEndElement();       xmlWriter.WriteEndDocument();       xmlWriter.Close();       WriteLine();       WriteLine("Contents of the protected file:");       WriteLine();       WriteLine(File.ReadAllText(xmlFile));     }   } }

using System.Collections.Generic;

using System.IO;

using System.Xml;

using Packt.Shared;

using static System.Console;

using static System.IO.Path;

using static System.Environment;

namespace Exercise02

{

  class Program

  {

    static void Main(string[] args)

    {

      WriteLine("You must enter a password to encrypt the sensitive data in the document.");

      WriteLine("You must enter the same passord to decrypt the document later.");

      Write("Password: ");

      string password = ReadLine();

      // define two example customers and

      // note they have the same password

      var customers = new List<Customer>

      {

        new Customer

        {

          Name = "Bob Smith",

          CreditCard = "1234-5678-9012-3456",

          Password = "Pa$$w0rd",

        },

        new Customer

        {

          Name = "Leslie Knope",

          CreditCard = "8002-5265-3400-2511",

          Password = "Pa$$w0rd",

        }

      };

      // define an XML file to write to

      string xmlFile = Combine(CurrentDirectory,

        "..", "protected-customers.xml");

      var xmlWriter = XmlWriter.Create(xmlFile,

        new XmlWriterSettings { Indent = true });

      xmlWriter.WriteStartDocument();

      xmlWriter.WriteStartElement("customers");

      foreach (var customer in customers)

      {

        xmlWriter.WriteStartElement("customer");

        xmlWriter.WriteElementString("name", customer.Name);

        // to protect the credit card number we must encrypt it

        xmlWriter.WriteElementString("creditcard",

          Protector.Encrypt(customer.CreditCard, password));

        // to protect the password we must salt and hash it

        // and we must store the random salt used

        var user = Protector.Register(customer.Name, customer.Password);

        xmlWriter.WriteElementString("password", user.SaltedHashedPassword);

        xmlWriter.WriteElementString("salt", user.Salt);

        xmlWriter.WriteEndElement();

      }

      xmlWriter.WriteEndElement();

      xmlWriter.WriteEndDocument();

      xmlWriter.Close();

      WriteLine();

      WriteLine("Contents of the protected file:");

      WriteLine();

      WriteLine(File.ReadAllText(xmlFile));

    }

  }

}