protected void btnLogin_Click(object sender, EventArgs e)
{
//connect
using (DefaultConnection db = new DefaultConnection())
{
//create instructor object
Staff objS = new Staff();
//first get salt value for this username
String username = txtUsername.Text;
objS = (from s in db.Staff
where s.username == username
select s).FirstOrDefault();
//did we find this username?
if (objS != null)
{
String salt = objS.salt;
//salt and hash the plain text password
String password = txtPassword.Text;
String pass_and_salt = password + salt;
// Create a new instance of the hash crypto service provider.
HashAlgorithm hashAlg = new SHA256CryptoServiceProvider();
// Convert the data to hash to an array of Bytes.
byte[] bytValue = System.Text.Encoding.UTF8.GetBytes(pass_and_salt);
// Compute the Hash. This returns an array of Bytes.
byte[] bytHash = hashAlg.ComputeHash(bytValue);
// Optionally, represent the hash value as a base64-encoded string,
// For example, if you need to display the value or transmit it over a network.
string base64 = Convert.ToBase64String(bytHash);
//check if the password we just salted and hashed matches the password in the db
if (objS.hashed == base64)
{
//lblError.Text = "Valid Login";
//store the identity in the session object
Session["AdminID"] = objS.AdminID;
//redirect to departments page
Response.Redirect("welcome.aspx");
}
else
{
lblError.Text = "Invalid Login";
}
}
else
{
lblError.Text = "Invalid Login";
}
}
}
protected void btnRegister_Click(object sender, EventArgs e)
{
//connect
using (DefaultConnection db = new DefaultConnection())
{
//create a new instructor
Staff objI = new Staff();
//fill the properties from the form inputs
objI.username = txtUsername.Text;
// will store objI.hashed later once password is encrypted
//salt and hash the plain text password
String password = txtPassword.Text;
String salt = CreateSalt(8);
String pass_and_salt = password + salt;
// Create a new instance of the hash crypto service provider.
HashAlgorithm hashAlg = new SHA256CryptoServiceProvider();
// Convert the data to hash to an array of Bytes.
byte[] bytValue = System.Text.Encoding.UTF8.GetBytes(pass_and_salt);
// Compute the Hash. This returns an array of Bytes.
byte[] bytHash = hashAlg.ComputeHash(bytValue);
// Optionally, represent the hash value as a base64-encoded string,
// For example, if you need to display the value or transmit it over a network.
string base64 = Convert.ToBase64String(bytHash);
objI.hashed = base64;
objI.salt = salt;
//save
db.Staff.Add(objI);
db.SaveChanges();
//redirect
Response.Redirect("login.aspx");
}
}
