protected void btnLogin_Click(object sender, EventArgs e)
{
using (DefaultConnection db = new DefaultConnection())
{
Instructor objc = new Instructor();
String username = txtUserName.Text;
objc = (from i in db.Instructors
where i.Username == username
select i).FirstOrDefault();
if (objc != null)
{
String salt = objc.Salt;
//salt and hash 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);
// cehck if matches password in db
if (objc.Password == base64)
{
lblError.Text = "Valid login";
// store session variable
Session["InstructorID"] = objc.InstructorID;
Session["InstructorName"] = objc.FirstName + " " + objc.LastName;
Session["DepartmentID"] = objc.DepartmentID;
Response.Redirect("departments.aspx");
}
}
else
{
lblError.Text = "invalid login";
}
}
}
protected void btnRegister_Click(object sender, EventArgs e)
{
try
{
using (DefaultConnection db = new DefaultConnection())
{
Instructor objc = new Instructor();
objc.FirstName = txtFirstName.Text;
objc.LastName = txtLastName.Text;
objc.Username = txtUserName.Text;
objc.DepartmentID = Convert.ToInt32(ddlDepartments.SelectedValue);
//salt and hash 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);
objc.Password = base64;
objc.Salt = salt;
db.Instructors.Add(objc);
db.SaveChanges();
}
}
catch
{
Response.Redirect("~/error.aspx");
}
}
