Chiffrer des éléments d'un fichier xml
Bonjour,
Après pas mal d'absence je reprends le développement.
J'ai un exemple de fichier xml comme suis:
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| <?xml version="1.0" encoding="utf-8" ?>
<root>
<creditcard>
<number>19834209</number>
<expiry>02/02/2002</expiry>
</creditcard>
</root> |
J'essaie de chiffrer donc la partie Voilà le code que j'ai trouvé:
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| using System;
using System.Windows.Forms;
using System.Xml;
using System.Security.Cryptography;
using System.Security.Cryptography.Xml;
namespace TestCryptage
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
Aes key = null;
try
{
// Create a new AES key.
key = Aes.Create();
// Load an XML document.
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.PreserveWhitespace = true;
xmlDoc.Load("Test.xml");
// Encrypt the "creditcard" element.
Encrypt(xmlDoc, "creditcard", key);
//Decrypt(xmlDoc, key);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
finally
{
// Clear the key.
if (key != null)
{
key.Clear();
}
}
} |
La méthode Encrypt:
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| public static void Encrypt(XmlDocument Doc, string ElementName, SymmetricAlgorithm Key) {
// Check the arguments.
if (Doc == null)
throw new ArgumentNullException("Doc");
if (ElementName == null)
throw new ArgumentNullException("ElementToEncrypt");
if (Key == null)
throw new ArgumentNullException("Alg");
////////////////////////////////////////////////
// Find the specified element in the XmlDocument
// object and create a new XmlElement object.
////////////////////////////////////////////////
XmlElement elementToEncrypt = Doc.GetElementsByTagName(ElementName)[0] as XmlElement;
// Throw an XmlException if the element was not found.
if (elementToEncrypt == null)
{
throw new XmlException("The specified element was not found");
}
//////////////////////////////////////////////////
// Create a new instance of the EncryptedXml class
// and use it to encrypt the XmlElement with the
// symmetric key.
//////////////////////////////////////////////////
EncryptedXml eXml = new EncryptedXml();
byte[] encryptedElement = eXml.EncryptData(elementToEncrypt, Key, false);
////////////////////////////////////////////////
// Construct an EncryptedData object and populate
// it with the desired encryption information.
////////////////////////////////////////////////
EncryptedData edElement = new EncryptedData();
edElement.Type = EncryptedXml.XmlEncElementUrl;
// Create an EncryptionMethod element so that the
// receiver knows which algorithm to use for decryption.
// Determine what kind of algorithm is being used and
// supply the appropriate URL to the EncryptionMethod element.
string encryptionMethod = null;
if (Key is Aes)
{
encryptionMethod = EncryptedXml.XmlEncAES256Url;
}
else
{
// Throw an exception if the transform is not AES
throw new CryptographicException("The specified algorithm is not supported or not recommended for XML Encryption.");
}
edElement.EncryptionMethod = new EncryptionMethod(encryptionMethod);
// Add the encrypted element data to the
// EncryptedData object.
edElement.CipherData.CipherValue = encryptedElement;
////////////////////////////////////////////////////
// Replace the element from the original XmlDocument
// object with the EncryptedData element.
////////////////////////////////////////////////////
EncryptedXml.ReplaceElement(elementToEncrypt, edElement, false);
} |
Quand je test le code aucun problème mais quand j'ouvre l'Xml, rien n'est chiffré !
Quelqu'un aurait une piste, ça fait 2 jours que je parcours des blogs, des tutos, etc...
J'ai chopé le code ici (Doc microsoft)...
Merci d'avances,
Cordialement,
Chtulus
