Csrf class

Author: BMathers35

src/csrf.php

@@ -0,0 +1,157 @@
+<?php
+
+    /**
+     * Class csrf
+     *
+     * @author Baha Şener
+     * @mail baha.sener@hotmail.com
+     * @date 8 December 2022
+     */
+
+    class Csrf{
+
+        public $config;
+
+        public function __construct($config){
+
+            $this->config = $config;
+
+            if(!in_array('openssl', get_loaded_extensions())){
+                $this->showError('OpenSSL extension must be installed in PHP.');
+                die();
+            }
+
+            if(!isset($this->config['key']) || empty($this->config['key'])){
+                $this->showError('You must specify a key value with the configuration.');
+                die();
+            }
+
+            if(!isset($this->config['secret']) || empty($this->config['secret'])){
+                $this->showError('You must specify a secret value with the configuration.');
+                die();
+            }
+
+            if(empty($_SESSION['_csrf'])){
+                $_SESSION['_csrf'] = $this->EncryptToken(bin2hex(random_bytes(32)));
+            }
+
+        }
+
+        private function EncryptToken($data){
+
+            if(isset($data)){
+
+                $key = hash('sha256', $this->config['key']);
+                $iv = substr(hash('sha256', $this->config['secret']), 0, 16);
+                $encrypt = openssl_encrypt($data, 'AES-128-CBC', $key, 0, $iv);
+                return $encrypt;
+
+            }
+
+        }
+
+        public function Get(){
+            return $_SESSION['_csrf'];
+        }
+
+        public function Check($token){
+
+            $userToken = $this->EncryptToken($token);
+            $systemToken = $this->EncryptToken($_SESSION['_csrf']);
+
+            if(hash_equals($userToken, $systemToken)){
+                unset($_SESSION['_csrf']);
+                return true;
+            }else{
+                return false;
+            }
+
+        }
+
+        public function Reset(){
+
+            if(isset($_SESSION['_csrf'])){
+
+                unset($_SESSION['_csrf']);
+
+                if(!isset($_SESSION['_csrf'])){
+
+                    $_SESSION['_csrf'] = $this->EncryptToken(bin2hex(random_bytes(32)));
+                    if(isset($_SESSION['_csrf'])){
+                        return true;
+                    }else{
+                        return false;
+                    }
+
+                }
+
+            }else{
+
+                if(empty($_SESSION['_csrf'])){
+
+                    $_SESSION['_csrf'] = $this->EncryptToken(bin2hex(random_bytes(32)));
+                    if(isset($_SESSION['_csrf'])){
+                        return true;
+                    }else{
+                        return false;
+                    }
+
+                }else{
+                    return false;
+                }
+
+            }
+
+        }
+
+        private function DecryptToken($data){
+
+            if(isset($data)){
+
+                $key = hash('sha256', $this->config['key']);
+                $iv = substr(hash('sha256', $this->config['secret']), 0, 16);
+                return openssl_decrypt($data, 'AES-128-CBC', $key, 0, $iv);
+
+            }
+
+        }
+
+        private function showError($error){
+            $this->errorTemplate($error);
+        }
+
+        private function errorTemplate($errorMsg, $title = null)
+        {
+            ?>
+            <div class="php-encryption-error-msg-content">
+                <div class="php-encryption-error-title">
+                    <?= $title ? $title : __CLASS__ . ' Error:' ?>
+                </div>
+                <div class="php-encryption-error-msg"><?= $errorMsg ?></div>
+            </div>
+            <style>
+                .php-encryption-error-msg-content {
+                    padding: 15px;
+                    border-left: 5px solid #c00000;
+                    background: rgba(192, 0, 0, 0.06);
+                    background: #f8f8f8;
+                    margin-bottom: 10px;
+                }
+
+                .php-encryption-error-title {
+                    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
+                    font-size: 16px;
+                    font-weight: 500;
+                }
+
+                .php-encryption-error-msg {
+                    margin-top: 15px;
+                    font-size: 14px;
+                    font-family: Consolas, Monaco, Menlo, Lucida Console, Liberation Mono, DejaVu Sans Mono, Bitstream Vera Sans Mono, Courier New, monospace, sans-serif;
+                    color: #c00000;
+                }
+            </style>
+            <?php
+        }
+
+    }