How to compare Laravel's hash password using a custom login form?

Question

Can you help me with this? I am building my own login form using Laravel. But I have a problem because I stored my password using Hash method and in my login form I used hash method again to compare. But I found out that the hash value is always changing.

Here's my code in routes:

Route::post('/admin_handle_login', function()
{

    $rules = array(
        'admin_username'    =>  'required',
        'admin_password'    =>  'required'
    );

    $validate_admin_login = Validator::make(Input::all(), $rules);

    if($validate_admin_login->fails()) {

        $messages = $validate_admin_login->messages();

        Session::flash('warning_notification','Error: Incomplete details!');

        return Redirect::to('/flaxadmin')
                            ->withErrors($messages)
                            ->withInput(Input::except('admin_password'));

    } else {

        $d = array(
            Input::get('admin_username'), Hash::make(Input::get('admin_password'))
        );

        $validate_admin = DB::table('administrators')
                            ->select('username')
                            ->where('username', Input::get('admin_username'))
                            ->where('password', Hash::check('password', Input::get('admin_password')))
                            ->count();
        fp($d);
        fp($validate_admin);

    }

});

The result is

Array
(
    [0] => admin002
    [1] => $2y$10$RTwKHN9W1/unu1ZhYlNjauApJjjoNTBnE6td/AZ5jWgZEdqVav0um
)
0

In my database the password of admin002 is

$2y$10$47sSXLzh/YXN6Rf2fmljYO7lZaxfhXVSUTp5bssR2gYQ6Nw9luUH2

Is my code wrong? Or are there any proper way to do this? I am a begiiner in Laravel..

Answer 1

First, you cannot do it this way. Assuming username is unique, you should do:

$validate_admin = DB::table('administrators')
                            ->select('username')
                            ->where('username', Input::get('admin_username'))
                            ->first();

if ($validate_admin && Hash::check(Input::get('admin_password'), $validate_admin->password)) {
  // here you know data is valid
}

However you should think about rather using built-in methods than coding it yourself. You have Auth::attempt or Auth::validate if you want to login/check only user with password so there's really no need to code it yourself.

Answer 2

A slight improvement to marcin-nabiałek's answer, you can now use PHP's password_verify to achieve the same

$user = App\User::where('email', $request->email)->first();

if($user && password_verify($request->password, $user->password)) {
   // authenticated user,
   // do something...
}

Answer 3

Here you're checking the string 'password' with the hashed version of the input password.

So try fetching the user by their username and if you've a result you can compare the hashed version of the password, stored in the database, with the input password. Like so:

$user = DB::table('administrators')
        ->select('username', 'password')
        ->where('username', Input::get('admin_username');

if($user->count()) {
    $user = $user->first();
    if(Hash::check(Input::get('admin_password'), $user->password)) {
         //User has provided valid credentials :)
    }
}