[Security] remove deprecated SrtingUtils class

src/Symfony/Component/Security/Core/Util/StringUtils.php

@@ -1,70 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\Security\Core\Util;
-
-@trigger_error('The '.__NAMESPACE__.'\\StringUtils class is deprecated since version 2.8 and will be removed in 3.0. Use hash_equals() instead.', E_USER_DEPRECATED);
-
-use Symfony\Component\Polyfill\Util\Binary;
-
-/**
- * String utility functions.
- *
- * @author Fabien Potencier <fabien@symfony.com>
- *
- * @deprecated since 2.8, to be removed in 3.0.
- */
-class StringUtils
-{
-    /**
-     * This class should not be instantiated.
-     */
-    private function __construct()
-    {
-    }
-
-    /**
-     * Compares two strings.
-     *
-     * This method implements a constant-time algorithm to compare strings.
-     * Regardless of the used implementation, it will leak length information.
-     *
-     * @param string $knownString The string of known length to compare against
-     * @param string $userInput   The string that the user can control
-     *
-     * @return bool true if the two strings are the same, false otherwise
-     */
-    public static function equals($knownString, $userInput)
-    {
-        // Avoid making unnecessary duplications of secret data
-        if (!is_string($knownString)) {
-            $knownString = (string) $knownString;
-        }
-
-        if (!is_string($userInput)) {
-            $userInput = (string) $userInput;
-        }
-
-        return hash_equals($knownString, $userInput);
-    }
-
-    /**
-     * Returns the number of bytes in a string.
-     *
-     * @param string $string The string whose length we wish to obtain
-     *
-     * @return int
-     */
-    public static function safeStrlen($string)
-    {
-        return Binary::strlen($string);
-    }
-}