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Save an encrypted person class

This commit is contained in:
Tim Young 2017-08-09 16:20:05 -05:00
parent e4edd9bf5a
commit 66657507ed
1 changed files with 49 additions and 19 deletions
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68
EduNetworkBuilder/PersonClass.cs
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@ -7,6 +7,8 @@ using System.Xml;
using System.IO;
using System.Windows.Forms;
using System.Drawing;
using System.Security.Cryptography;
using System.Security.Cryptography.Xml;
namespace EduNetworkBuilder
{
@ -30,7 +32,7 @@ namespace EduNetworkBuilder
/// </summary>
public string FullName = "";
List<string> Passwords = new List<string>();
string Password = "";
string PasswordHint = "";
/// <summary>
@ -79,22 +81,9 @@ namespace EduNetworkBuilder
}
public string Password(int index = 0)
{
if (Passwords.Count == 0) return "";
if (index < 0) return "";
if (index >= Passwords.Count) return "";
return Passwords[index];
}
public void ChangePassword(string NewPassword)
{
Passwords.Insert(0, NewPassword);
int maxPWs = 1;
if (isAdmin)
maxPWs = 10; //Admins store the last 10 passwords. If the admin changed his PW, we still need to decrypt the student's files
for (int a = Passwords.Count - 1; a >= maxPWs; a--)
Passwords.RemoveAt(a); //Remove all but the one password
Password = NewPassword;
}
#region Load and Save
@ -149,7 +138,7 @@ namespace EduNetworkBuilder
ChangePassAtFirstLogin = changepw;
break;
case "password":
Passwords.Add(Individual.InnerText);
Password = Individual.InnerText;
break;
case "settings":
UserSettings = NB.Deserialize<NBSettings>(Individual.InnerText);
@ -198,7 +187,12 @@ namespace EduNetworkBuilder
writer.WriteEndElement();
writer.WriteEndDocument();
}
doc.Save(filename);
if(TryToEncrypt(doc) != null)
doc.Save(filename);
else
{
//We should blow up gracefully. Not sure why we failed.
}
}
@ -222,8 +216,7 @@ namespace EduNetworkBuilder
string settingsstring = NB.SerializeObject<NBSettings>(UserSettings);
writer.WriteElementString("Settings", settingsstring);
foreach(string One in Passwords)
writer.WriteElementString("Password", One);
writer.WriteElementString("Password", Password);
foreach (PersonClass PC in Students)
PC.Save(writer, true); //Save as a student entry
//Save all the devices
@ -233,6 +226,43 @@ namespace EduNetworkBuilder
}
writer.WriteEndElement();
}
private XmlDocument TryToEncrypt(XmlDocument What)
{
string UserPassword = UserName + Password;
if (UserPassword == "") return null; //This should never happen
string salt = TrippleDESDocumentEncryption.GenSalt(NB.GetRandom());
TripleDES tDESkey = TrippleDESDocumentEncryption.GenKey(UserPassword, salt);
TrippleDESDocumentEncryption xmlTDES = new TrippleDESDocumentEncryption(What, tDESkey);
try
{
// Encrypt the "user" element.
xmlTDES.Encrypt("User");
//make the entries for the key
XmlNode tNode = xmlTDES.Doc.CreateElement("EncryptedKey");
tNode.InnerText = UserPassword;
XmlElement inputElement = xmlTDES.Doc.GetElementsByTagName("EncryptedData")[0] as XmlElement;
xmlTDES.Doc.DocumentElement.InsertAfter(tNode, inputElement);
//add the salt
tNode = xmlTDES.Doc.CreateElement("Salt");
tNode.InnerText = salt;
xmlTDES.Doc.DocumentElement.InsertAfter(tNode, inputElement);
//encrypt the user key with the admin key
xmlTDES.SetKey(AltPassword, salt);
xmlTDES.Encrypt("EncryptedKey");
}
catch (Exception e)
{
Console.WriteLine(e.Message);
return null;
}
return xmlTDES.Doc;
}
#endregion
public bool AddHomework(SchoolworkClass ToAdd)