php 可逆的加密算法

代码：

 1 <?php
 2 
 3 class Test {
 4 
 5     private $authCodeKey = 'khUvFB9pijNyCYMGZdzqeKalyg7dh';    
 6 
 7     function authCode($input, $key) {
 8 
 9         # Input must be of even length.
10         if (strlen($input) % 2) {
11             //$input .= '0';
12         }
13 
14         # Keys longer than the input will be truncated.
15         if (strlen($key) > strlen($input)) {
16             $key = substr($key, 0, strlen($input));
17         }
18 
19         # Keys shorter than the input will be padded.
20         if (strlen($key) < strlen($input)) {
21             $key = str_pad($key, strlen($input), '0', STR_PAD_RIGHT);
22         }
23 
24         # Now the key and input are the same length.
25         # Zero is used for any trailing padding required.
26 
27         # Simple XOR'ing, each input byte with each key byte.
28         $result = '';
29         for ($i = 0; $i < strlen($input); $i++) {
30             $result .= $input{$i} ^ $key{$i};
31         }
32         return $result;
33     }
34 
35     /**
36      * 加密
37      */
38     function encrypt($sessionId) {
39 
40         $hashKey = $this->base64url_encode($this->authCode($sessionId, $this->authCodeKey));
41         $hashKey = $this->base64url_encode($sessionId);
42         return $hashKey;
43     }
44 
45 
46     /**
47      * 解密
48      */
49     function decrypt($hashKey) {
50 
51         $authCodeKey = 'khUvFB9pijNyCYMGZdzqeKalyg7dh';
52         $sessionId = $this->authCode($this->base64url_decode($hashKey), $this->authCodeKey);
53         $sessionId = $this->base64url_decode($hashKey);
54         return $sessionId;
55     }
56 
57     // url传输需要替换部分字符
58     function base64url_encode($data) {
59         return rtrim(strtr(base64_encode($data), '+/', '-_'), '=');
60     }
61     // url传输需要替换部分字符
62     function base64url_decode($data) {
63         return base64_decode(str_pad(strtr($data, '-_', '+/'), strlen($data) % 4, '=', STR_PAD_RIGHT));
64     }
65 }

测试代码：

 1 $uId = 'gouge';
 2 $signKey = 'gouge-test123';
 3 $timestamp = time();
 4 
 5 // 需要加密的值 根据实际情况添加
 6 $signParam = array($uId, $timestamp, $signKey);
 7 $sessionId = implode(',', $signParam);
 8 
 9 $e = new Test();
10 // 加密
11 $r = $e->encrypt($sessionId);
12 // 解密
13 $t = $e->decrypt($r);
14 
15 echo $r;
16 echo "<br/>";
17 echo $t;

输出结果：

1、加密 =》Z291Z2UsMTQ5ODc5NTMxNixnb3VnZS10ZXN0MTIz

2、解密 =》gouge,1498795316,gouge-test123