http://blog.ddian.cn/?post=923
-
class Ender{
- private $enkey;//加密解密用的密钥
- //构造参数是密钥
- public function __construct($key=''){
- if(!$key){
- $this->enkey=$key;
- }
- }
- //设置密钥
- public function set_key($key){
- $this->enkey=$key;
- }
- private function keyED($txt,$encrypt_key)
- {
- $encrypt_key = md5($encrypt_key);
- $ctr=0;
- $tmp = "";
- for ($i=0;$i {
- if ($ctr==strlen($encrypt_key)) $ctr=0;
- $tmp.= substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1);
- $ctr ;
- }
- return $tmp;
- }
- //加密字符串
- public function encrypt($txt,$key='')
- {
- if(!$key){
- $key=$this->enkey;
- }
- srand((double)microtime()*1000000);
- $encrypt_key = md5(rand(0,32000));
- $ctr=0;
- $tmp = "";
- for ($i=0;$i {
- if ($ctr==strlen($encrypt_key)) $ctr=0;
- $tmp.= substr($encrypt_key,$ctr,1) .
- (substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1));
- $ctr ;
- }
- return base64_encode($this->keyED($tmp,$key));
- }
- //解密字符串
- public function decrypt($txt,$key='')
- {
- $txt=base64_decode($txt);
- if(!$key){
- $key=$this->enkey;
- }
- $txt = $this->keyED($txt,$key);
- $tmp = "";
- for ($i=0;$i {
- $md5 = substr($txt,$i,1);
- $i ;
- $tmp.= (substr($txt,$i,1) ^ $md5);
- }
- return $tmp; //http://blog.ddian.cn
- }
-
- }
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