Change password in laravel

Html form to get the user input data password and new password.

<form id="form-change-password" role="form" method="POST" action="{{ url('/user/credentials') }}" novalidate class="form-horizontal">
    <div class="col-md-9">
        <label for="current-password" class="col-sm-4 control-label">Current Password</label>
        <div class="col-sm-8">
            <div class="form-group">
                <input type="hidden" name="_token" value="{{ csrf_token() }}">
                <input type="password" class="form-control" id="current-password" name="current-password" placeholder="Password">
            </div>
        </div>
        <label for="password" class="col-sm-4 control-label">New Password</label>
        <div class="col-sm-8">
            <div class="form-group">
                <input type="password" class="form-control" id="password" name="password" placeholder="Password">
            </div>
        </div>
        <label for="password_confirmation" class="col-sm-4 control-label">Re-enter Password</label>
        <div class="col-sm-8">
            <div class="form-group">
                <input type="password" class="form-control" id="password_confirmation" name="password_confirmation" placeholder="Re-enter Password">
            </div>
        </div>
    </div>
    <div class="form-group">
        <div class="col-sm-offset-5 col-sm-6">
            <button type="submit" class="btn btn-danger">Submit</button>
        </div>
    </div>
</form>

function to validate request form data.

public function credential_rules(array $data)
{
    $messages = [
        'current-password.required' => 'Please enter current password',
        'password.required' => 'Please enter password',
    ];

    $validator = Validator::make($data, [
        'current-password' => 'required',
        'password' => 'required|same:password',
        'password_confirmation' => 'required|same:password',
    ], $messages);

    return $validator;
}

Function to change the password.

public function postCredentials(Request $request)
{
    if(Auth::Check())
    {
        $request_data = $request->All();
        $validator = $this->credential_rules($request_data);
        if($validator->fails())
        {
            return response()->json(array('error' => $validator->getMessageBag()->toArray()), 400);
        }
        else
        {
            $current_password = Auth::User()->password;
            if(Hash::check($request_data['current-password'], $current_password))
            {
                $user_id = Auth::User()->id;
                $obj_user = User::find($user_id);
                $obj_user->password = Hash::make($request_data['password']);
                $obj_user->save();
                return "ok";
            }
            else
            {
                $error = array('current-password' => 'Please enter correct current password');
                return response()->json(array('error' => $error), 400);
            }
        }
    }
    else
    {
        return redirect()->to('/');
    }
}