protected void btnLogin_Click(object sender, EventArgs e)
{
//connect
using (DefaultConnection db = new DefaultConnection())
{
// create user obj
user userObj = new user();
// get username from input value
String username = txtUsername.Text;
userObj = (from u in db.users
where u.username == username
select u).FirstOrDefault();
// check if user exists
if (userObj != null)
{
String salt = userObj.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);
if (userObj.password == base64)
{
//lblError.Text = "Valid Login";
//store the identity in the session object
Session["userID"] = userObj.id;
Session["username"] = userObj.username;
// redirect to departments page
Response.Redirect("default.aspx");
}
else
{
lblError.Text = "Invalid Login";
}
} else
{
lblError.Text = "Invalid Login";
}
}
}
protected void btnSignup_Click(object sender, EventArgs e)
{
// connect
using (DefaultConnection db = new DefaultConnection())
{
// create a new user
user userObj = new user();
// fill user name from sign up form input
userObj.username = txtUsername.Text;
// 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);
userObj.password = base64;
userObj.salt = salt;
// save
db.users.Add(userObj);
db.SaveChanges();
// redirect
Response.Redirect("default.aspx");
}
}
