I got this register form where i get the user email and password and hash the password using SHA512
public Boolean IsRegistered(String email, String pass)
{
SHA512 shaM = new SHA512Managed();
if (pass.Length > 0 && email.Length > 0)
{
byte[] data = Encoding.UTF8.GetBytes(pass);
String encryptedpass = Encoding.UTF8.GetString(shaM.ComputeHash(data));
using (ModelContainer db = new ModelContainer())
{
//User usr = db.UserSet.Where(u => u.PasswordDigest == encryptedpass && u.Email == email).First();
int matches = (from u in bd.UserSet
where u.PasswordDigest == encryptedpass&& u.Email == email
select new
{
Id = u.Id
}
).Count();
if (matches > 0)
{
return true;
}
}
}
return false;
}
I use this method each time the user logs in and it works like a charm (i guess), thing is when i prompt the user to change his/her password i cannot seem to be able to validate the old one here is what i try
I do the following to retrive the user data on the MyAccount form's constructor
User user;.
public MyAccount()
{
InitializeComponent();
try
{
using (ModelContainer db = new ModelContainer())
{
user = (from u in db.UserSet where u.Id == 2 select u).First();
txtName.Text = user.Name;
txtEmail.Text = user.Email;
}
}
catch (Exception x)
{
ErrorAlert error = new ErrorAlert("Error: " + x.Message);
error.Owner = getParentWindow();
error.ShowDialog();
}
}
then I validate it on the forms button_click
using (ModelContainer db = new ModelContainer())
{
SHA512 shaM = new SHA512Managed();
string oldpass = Encoding.UTF8.GetString(shaM.ComputeHash(Encoding.UTF8.GetBytes(ptxtOldPassword.Password)));
shaM.Dispose();
db.UserSet.Attach(user);
Regex rgx = new Regex(@"\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z");
if (rgx.IsMatch(txtEmail.Text))
{
if (oldpass == user.PasswordDigest)
{
if (ptxtNewPassword.Password.Equals(ptxtNewPassword2.Password))
{
string newpass = Encoding.UTF8.GetString(shaM.ComputeHash(Encoding.UTF8.GetBytes(ptxtNewPassword.Password)));
user.Name = txtName.Text;
user.Email = txtEmail.Text;
user.PasswordDigest = newpass;
db.SaveChanges();
}
else
{
ErrorAlert error = new ErrorAlert("Passwords do not match");
error.Owner = getParentWindow();
error.ShowDialog();
}
When I comapare the old password in the database with the one the user enter they do not match since they are strings I've tried using equals with no luck I thought == would work but I was wrong, i looked into other answers and found this Sha512 not returning equal in c# hash validation sadly it didn't work for me, I need to understand why my first validation work and the second doesnt
so any help is apreciated Have a nice day
