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Signed-off-by: j502647092 <jtb1@163.com>

ThinkPHP/Library/Think/Crypt/Driver/Crypt.class.php

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+<?php
+// +----------------------------------------------------------------------
+// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
+// +----------------------------------------------------------------------
+// | Copyright (c) 2009 http://thinkphp.cn All rights reserved.
+// +----------------------------------------------------------------------
+// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
+// +----------------------------------------------------------------------
+// | Author: liu21st <liu21st@gmail.com>
+// +----------------------------------------------------------------------
+namespace Think\Crypt\Driver;
+/**
+ * Crypt 加密实现类
+ * @category   ORG
+ * @package  ORG
+ * @subpackage  Crypt
+ * @author    liu21st <liu21st@gmail.com>
+ */
+class Crypt {
+
+    /**
+     * 加密字符串
+     * @param string $str 字符串
+     * @param string $key 加密key
+     * @param integer $expire 有效期（秒）     
+     * @return string
+     */
+    public static function encrypt($str,$key,$expire=0){
+        $expire = sprintf('%010d', $expire ? $expire + time():0);
+        $r = md5($key);
+        $c = 0;
+        $v = "";
+        $str    =   $expire.$str;
+		$len = strlen($str);
+		$l = strlen($r);
+        for ($i=0;$i<$len;$i++){
+         if ($c== $l) $c=0;
+         $v .= substr($r,$c,1) .
+             (substr($str,$i,1) ^ substr($r,$c,1));
+         $c++;
+        }
+        return self::ed($v,$key);
+    }
+
+    /**
+     * 解密字符串
+     * @param string $str 字符串
+     * @param string $key 加密key
+     * @return string
+     */
+    public static function decrypt($str,$key) {
+        $str = self::ed($str,$key);
+        $v = "";
+		$len = strlen($str);
+        for ($i=0;$i<$len;$i++){
+         $md5 = substr($str,$i,1);
+         $i++;
+         $v .= (substr($str,$i,1) ^ $md5);
+        }
+        $data   =    $v;
+        $expire = substr($data,0,10);
+        if($expire > 0 && $expire < time()) {
+            return '';
+        }
+        $data   = substr($data,10);
+        return $data;
+    }
+
+
+   static private function ed($str,$key) {
+      $r = md5($key);
+      $c = 0;
+      $v = '';
+	  $len = strlen($str);
+	  $l = strlen($r);
+      for ($i=0;$i<$len;$i++) {
+         if ($c==$l) $c=0;
+         $v .= substr($str,$i,1) ^ substr($r,$c,1);
+         $c++;
+      }
+      return $v;
+   }
+}