protected void btnLogin_Click(object sender, EventArgs e)
{
//connect
using (DefaultConnection db = new DefaultConnection())
{
//create user object
User objU = new User();
//get salt value for this username
String Username = txtUsername.Text;
objU = (from u in db.Users where u.Username == Username select u).FirstOrDefault();
//find match for username
if (objU != null)
{
String salt = objU.Salt;
//salt and hash plain text pw
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 passwords match
if (objU.Password == base64)
{
//store identity in session obj
Session["UserID"] = objU.UserID;
Session["Name"] = objU.Name;
//redirect to standings page
Response.Redirect("standings.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 user
User objU = new User();
//fill properties
objU.Name = txtName.Text;
objU.Username = txtUsername.Text;
//salt and hash plain text pw
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);
objU.Password = base64;
objU.Salt = salt;
//save
db.Users.Add(objU);
db.SaveChanges();
}
}
