- <?php
- $id = "http://www.xiaoshuoshu.org/files/article/html/0/160/index.html";
- $token = encrypt($id, 'E', 'qingdou');
- echo '加密:'.encrypt($id, 'E', 'qingdou');
- echo '<br />';
- echo '解密:'.encrypt($token, 'D', 'qingdou');
- /*********************************************************************
- 函数名称:encrypt
- 函数作用:加密解密字符串
- 使用方法:
- 加密 :encrypt('str','E','qingdou');
- 解密 :encrypt('被加密过的字符串','D','qingdou');
- 参数说明:
- $string :需要加密解密的字符串
- $operation:判断是加密还是解密:E:加密 D:解密
- $key :加密的钥匙(密匙);
- *********************************************************************/
- function encrypt($string,$operation,$key='')
- {
- $src = array("/","+","=");
- $dist = array("_a","_b","_c");
- if($operation=='D'){$string = str_replace($dist,$src,$string);}
- $key=md5($key);
- $key_length=strlen($key);
- $string=$operation=='D'?base64_decode($string):substr(md5($string.$key),0,8).$string;
- $string_length=strlen($string);
- $rndkey=$box=array();
- $result='';
- for($i=0;$i<=255;$i++)
- {
- $rndkey[$i]=ord($key[$i%$key_length]);
- $box[$i]=$i;
- }
- for($j=$i=0;$i<256;$i++)
- {
- $j=($j+$box[$i]+$rndkey[$i])%256;
- $tmp=$box[$i];
- $box[$i]=$box[$j];
- $box[$j]=$tmp;
- }
- for($a=$j=$i=0;$i<$string_length;$i++)
- {
- $a=($a+1)%256;
- $j=($j+$box[$a])%256;
- $tmp=$box[$a];
- $box[$a]=$box[$j];
- $box[$j]=$tmp;
- $result.=chr(ord($string[$i])^($box[($box[$a]+$box[$j])%256]));
- }
- if($operation=='D')
- {
- if(substr($result,0,8)==substr(md5(substr($result,8).$key),0,8))
- {
- return substr($result,8);
- }
- else
- {
- return'';
- }
- }
- else
- {
- $rdate = str_replace('=','',base64_encode($result));
- $rdate = str_replace($src,$dist,$rdate);
- return $rdate;
- }
- }
- ?>
- //该片段来自于http://www.codesnippet.cn/detail/100320148925.html
来源: http://www.codesnippet.cn/detail/100320148925.html