class Crypt{

// 本文来源：龙哥博客

protected $key = “”; //公钥

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;

}

public function encrypt($txt,$key=”")

{

if(empty($key)){

$key=$this->key;

}

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 $this->keyED($tmp,$key);

}

public function decrypt($txt,$key=”")

{

if(empty($key)){

$key=$this->key;

}

$txt = $this->keyED($txt,$key);

$tmp = “”;

for ($i=0;$i

{

$md5 = substr($txt,$i,1);

$i++;

$tmp.= (substr($txt,$i,1) ^ $md5);

}

return $tmp;

}

public function setKey($key)

{

if(empty($key)){

return null;

}

$this->key=$key;

}

public function getKey()

{

return $this->key;

}

// Downloads By

}

$string = “http://www.52blogger.com”;

$crypt= new Crypt();

$crypt->setKey(“http://www.52blogger.com”);

$enc_text = $crypt->encrypt($string,$crypt->getKey());

$dec_text = $crypt->decrypt($enc_text,$crypt->getKey());

echo “加密前 : $string

n”;

echo “加密后 : $enc_text

n”;

echo “解密后 : $dec_text n”;

?>

执行结果:

加密前 :

加密后 : hSzQ’Z* kP~y(WpVs=6Q3gZbR5QkhtZ(f=Zm

解密后 :

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