Get the load func in place
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@ -88,14 +88,19 @@ namespace EduNetworkBuilder
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#region Load and Save
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//Load and save functions
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public void Load(string filename)
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public bool Load(string filename, string password = "")
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{
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XmlDocument xmlDoc = new XmlDocument();
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if (File.Exists(filename))
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{
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xmlDoc.Load(filename);
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Load(xmlDoc);
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if (TryToDecrypt(xmlDoc, password) != null)
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{
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Load(xmlDoc);
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return true;
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}
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}
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return false;
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}
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public void Load(XmlNode TheNode)
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@ -263,9 +268,64 @@ namespace EduNetworkBuilder
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}
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return xmlTDES.Doc;
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}
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#endregion
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public bool AddHomework(SchoolworkClass ToAdd)
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private XmlDocument TryToDecrypt(XmlDocument What, string PassToTry)
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{
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bool first_failed = false;
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XmlElement inputElement = What.GetElementsByTagName("Salt")[0] as XmlElement;
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if (inputElement == null) return What; //No salt means it was never encrypted. Load as normal
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string salt = inputElement.InnerText;
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// Create a new TripleDES key.
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TripleDES tDESkey = TrippleDESDocumentEncryption.GenKey(PassToTry, salt);
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TrippleDESDocumentEncryption xmlTDES = new TrippleDESDocumentEncryption(What, tDESkey);
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//First, try to decrypt it using the user password.
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try
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{
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xmlTDES.Decrypt("User");
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}
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catch (LoginException le)
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{
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//we ignore this. Just try it again.
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first_failed = true;
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}
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catch(Exception e) //This is bad. Blow up and exit the function
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{
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MessageBox.Show(e.ToString());
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return null;
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}
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if (first_failed)
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{ //try a second one, decrypting the alt key and then using that. The admin does this.
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// Create a new instance of the TrippleDESDocumentEncryption object
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// defined in this sample.
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try
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{
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xmlTDES.Decrypt("EncryptedKey");
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inputElement = xmlTDES.Doc.GetElementsByTagName("EncryptedKey")[0] as XmlElement;
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string userpw = inputElement.InnerText;
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xmlTDES.SetKey(userpw, salt);
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xmlTDES.Decrypt("User");
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}
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catch (LoginException le)
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{
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//Neither password worked. Exit out so we can prompt for an appropriate password
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return null;
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}
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catch (Exception e) //This is bad. Blow up and exit the function
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{
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MessageBox.Show(e.ToString());
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return null;
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}
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}
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return xmlTDES.Doc;
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}
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#endregion
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public bool AddHomework(SchoolworkClass ToAdd)
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{
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//Check to see if we already exist
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foreach(SchoolworkClass one in Projects)
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