XML - Encrypting / Decrypting ( RijndaelManaged )

I really have liked to use XML to manage data, but when you use this type of file in a standalone project where the data is exposed to users, it can be a big problem. So, I'll show you how to make the texts unreadable for the user using encryption. In this case ( RijndaelManaged algorithm ).

I,m using the same system of the older post : XML - Loading data from a xml file. with some modifications.

Here is my Xml file pre created:

  
    Level 1 (xml)
    Try comes close to all four people. (xml)
    
    
    
    
    Very Good! (xml)
  
  
    Level 2 (xml)
    Try comes close to all four people, again! (xml)
    
    
    
    
    Very Good! (xml)
  

I put the functions below in the script to encrypt / decrypt the xml file.

public static string Encrypt (string toEncrypt)
{
 byte[] keyArray = UTF8Encoding.UTF8.GetBytes ("12345678901234567890123456789012");
 // 256-AES key
 byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes (toEncrypt);
 RijndaelManaged rDel = new RijndaelManaged ();
 rDel.Key = keyArray;
 rDel.Mode = CipherMode.ECB;
 // http://msdn.microsoft.com/en-us/library/system.security.cryptography.ciphermode.aspx
 rDel.Padding = PaddingMode.PKCS7;
 // better lang support
 ICryptoTransform cTransform = rDel.CreateEncryptor ();
 byte[] resultArray = cTransform.TransformFinalBlock (toEncryptArray, 0, toEncryptArray.Length);
 return Convert.ToBase64String (resultArray, 0, resultArray.Length);
}

public static string Decrypt (string toDecrypt)
{
 byte[] keyArray = UTF8Encoding.UTF8.GetBytes ("12345678901234567890123456789012");
 // AES-256 key
 byte[] toEncryptArray = Convert.FromBase64String (toDecrypt);
 RijndaelManaged rDel = new RijndaelManaged ();
 rDel.Key = keyArray;
 rDel.Mode = CipherMode.ECB;
 // http://msdn.microsoft.com/en-us/library/system.security.cryptography.ciphermode.aspx
 rDel.Padding = PaddingMode.PKCS7;
 // better lang support
 ICryptoTransform cTransform = rDel.CreateDecryptor ();
 byte[] resultArray = cTransform.TransformFinalBlock (toEncryptArray, 0, toEncryptArray.Length);
 return UTF8Encoding.UTF8.GetString (resultArray);
}

And now the encrypted xml file looks like this:

Mwpbrm94CDw0Q5UXhTkzdF09fl6ZGAjWpmh3bL6eJXx7QFvSxXYZMrrUPnuHreGhrT5lzLV5gYsBQykOYBepn2PWpu0
fmlBRdl+65iAS3+B9dM96M1EkbJUsJ+JZKZehaTq5mjgsxxZIw0ytnvh+PSYBRgIliVreSdvGWptk2xQTZTaqUyW8sy0b1V6m
jWJ3TlGOvpmbYRgdBVnIbtbeB+NM6quFb+ecgyLqpYL3QsSdiAJOZz6geozoBTRWc6nsbivK9buj5F4RfBTLM/d0NArTT8ybB
x9TvcRy0uBtpKAX4rxvjVVLH/GCCe8pD0wGVUn94RSr4G1C6eAEcedZqNjQwqL6PQeDS5J5WAylNIqQM5g+Rntp3LhHDjWXUA
6IZEDFzlfliSrNlQhu0pGZLyWJ+Eqd1alseNzn2kxwbow3+AaJjFxkhpQhGEDPvth040hpQP+D23D2/QGdS24COb3AgSoGrXH
oMTQsfVxhMFt8ZeZgF8dXKPFzFRz/d4L75cFDpOCcxp8E0pmXXvyuw3XBF8o9Ug7EJYi0SJoDxNbLiKjZat+1vdkZL5qwHhtrX
l8sWwIrBxE4OsoONI5bw1+2/7WURghAIvdf3FvsvYVTQMeFhobZGnZe8vpq+dFCUHArxc34kOxJvDJRrVL3iI66k84baTrT0U
1bVukWEtoeHWx7f92ndrjSppPjrv3objIq9hsntOZiw3bMQsM6UG2qyi2N4c0H+33R9okBwQL/r8soJ52N6xaDFTfHuvAI25e
Ok4CEwnpabA6SAqMkiLeoUoGCNhL/YuPuGqLhQbY5BvHSfRSDB8/hVAKLobraEhhv4WFQaXNJU7ICfKG5cFyUeC7P4voQTiuZ
Gc2lzKpriWOjK/i+skE/XBxNpqiloyqXNETseUCIynRg4fzx6SR5n/iI1D0CwV2UKmci+ykPB4NFOgla2qayGyqTGACiexw9A
qh7xqJtuBuMvE+I5JC2j9lTO/66qtvAtKIcGbN43PsPGG6B19TEsEoTJZ8XEhhv4WFQaXNJU7ICfKG5cKf3/Z63J+J8uapK1c
vrTKuPxV6LufAmBC/60kGJd3QaoVYfBQ0sP+RECiGDfy5pbupce5JY6f7+ye37YunYUAs=

Here you can download the fully functioning project. There are many possibilities. I suggest this method only for small or moderate xml files, it can be demanding for processing. I hope you enjoyed it, give your comments!

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