http://blog.ddian.cn/?post=923 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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