1 <?php
 2     /* 打开加密算法和模式 */
 3     $td = mcrypt_module_open(‘rijndael-256‘, ‘‘, ‘ofb‘, ‘‘);
 4 
 5     /* 创建初始向量，并且检测密钥长度。 
 6      * Windows 平台请使用 MCRYPT_RAND。 */
 7     $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_DEV_RANDOM);
 8     $ks = mcrypt_enc_get_key_size($td);
 9 
10     /* 创建密钥 */
11     $key = substr(md5(‘very secret key‘), 0, $ks);
12 
13     /* 初始化加密 */
14     mcrypt_generic_init($td, $key, $iv);
15 
16     /* 加密数据 */
17     $encrypted = mcrypt_generic($td, ‘This is very important data‘);
18 
19     /* 结束加密，执行清理工作 */
20     mcrypt_generic_deinit($td);
21 
22     /* 初始化解密模块 */
23     mcrypt_generic_init($td, $key, $iv);
24 
25     /* 解密数据 */
26     $decrypted = mdecrypt_generic($td, $encrypted);
27 
28     /* 结束解密，执行清理工作，并且关闭模块 */
29     mcrypt_generic_deinit($td);
30     mcrypt_module_close($td);
31 
32     /* 显示文本 */
33     echo trim($decrypted) . "\n";
34 ?> 

 1 <?php
 2 /**
 3  * PHP AES加密解密类
 4  * Created by PhpStorm.
 5  * User: ahao
 6  * Date: 2016/11/3
 7  * Time: 0:03
 8  */
 9 class PubEncrypt{
10     public static $key = ‘123454536f667445454d537973576562‘;  // 默认的key
11 
12     /**
13      * AES加密
14      * @param $data  明文
15      * @param null $key  加密密钥
16      * @return array|string
17      */
18     public static function AesEncrypt($data, $key = null){
19         $data = trim($data);
20         if($data == ‘‘) return ‘‘;
21         try{
22             if(!extension_loaded(‘mcrypt‘))
23                 throw new Exception(‘当前PHP环境没有加载mcrypt扩展‘);
24 
25             // 打开加密算法和模式
26             $module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, ‘‘, MCRYPT_MODE_CBC, ‘‘);
27 
28             $key = self::substr($key == null ? self::$key : $key, 0, mcrypt_enc_get_key_size($module));
29             $iv = substr(md5($key), 0, mcrypt_enc_get_iv_size($module));
30 
31             // 初始化加密
32             mcrypt_generic_init($module, $key, $iv);
33 
34             // 加密数据
35             $encrypt = mcrypt_generic($module, $data);
36 
37             // 反初始化释放资源
38             mcrypt_generic_deinit($module);
39 
40             // 关闭资源对象退出
41             mcrypt_module_close($module);
42             return array(‘status‘ => true, ‘data‘ => base64_encode($encrypt));
43         }catch (Exception $e){
44             $error = $e->getMessage();
45             $data = array(
46                 ‘status‘ => false,
47                 ‘msg‘ => $error
48             );
49             return $data;
50         }
51     }
52 
53     /**
54      * AES解密
55      * @param $encrypted  密文
56      * @param null $key  解密密钥
57      * @return array|string
58      */
59     public static function AesDecrypt($encrypted, $key = null){
60         $encrypted = trim($encrypted);
61         if($encrypted == ‘‘)  return ‘‘;
62         try{
63             if(!extension_loaded(‘mcrypt‘))
64                 throw new Exception(‘当前PHP环境没有加载mcrypt扩展‘);
65 
66             $encrypted = base64_decode($encrypted);
67             $module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, ‘‘, MCRYPT_MODE_CBC, ‘‘);
68 
69             $key = self::substr($key == null ? self::$key : $key, 0, mcrypt_enc_get_key_size($module));
70             $iv = substr(md5($key), 0, mcrypt_enc_get_iv_size($module));
71 
72             mcrypt_generic_init($module, $key, $iv);
73             $decrypted = mdecrypt_generic($module, $encrypted);
74             mcrypt_generic_deinit($module);
75             mcrypt_module_close($module);
76             return array(‘status‘ => true, ‘data‘ => rtrim($decrypted,"\0"));
77         }catch (Exception $e){
78             $error = $e->getMessage();
79             $data = array(
80                 ‘status‘ => false,
81                 ‘msg‘ => $error
82             );
83             return $data;
84         }
85     }
86 
87 
88     /**
89      * 截取字符串
90      * @param $string  被截取的字符串
91      * @param $start   起始位置
92      * @param $length  截取长度
93      * @return string  截取到的字符串
94      */
95     private static function substr($string, $start, $length)
96     {
97         return extension_loaded(‘mbstring‘) ? mb_substr($string,$start,$length,‘8bit‘) : substr($string,$start,$length);
98     }
99 }