Removed unused SecureKey class

src/Utils/SecureKey.php

@@ -1,48 +0,0 @@
-<?php
-/**
- * OAuth 2.0 Secure key generator.
- *
- * @author      Alex Bilbie <hello@alexbilbie.com>
- * @copyright   Copyright (c) 2013 PHP League of Extraordinary Packages
- * @license     http://mit-license.org/
- *
- * @link        http://github.com/php-loep/oauth2-server
- */
-namespace League\OAuth2\Server\Utils;
-
-use League\OAuth2\Server\Exception\OAuthServerException;
-
-/**
- * SecureKey class.
- */
-class SecureKey
-{
-    /**
-     * Generate a new unique code.
-     *
-     * @param int $len Length of the generated code
-     *
-     * @throws \League\OAuth2\Server\Exception\OAuthServerException
-     *
-     * @return string
-     */
-    public static function generate($len = 40)
-    {
-        try {
-            $string = random_bytes($len);
-            // @codeCoverageIgnoreStart
-        } catch (\TypeError $e) {
-            // Well, it's an integer, so this IS unexpected.
-            throw OAuthServerException::serverError('An unexpected error has occurred');
-        } catch (\Error $e) {
-            // This is also unexpected because 32 is a reasonable integer.
-            throw OAuthServerException::serverError('An unexpected error has occurred');
-        } catch (\Exception $e) {
-            // If you get this message, the CSPRNG failed hard.
-            throw OAuthServerException::serverError('Could not generate a random string. Is our OS secure?');
-        }
-        // @codeCoverageIgnoreEnd
-
-        return bin2hex($string);
-    }
-}