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[ÄíÅ° ¾Ïȣȭ] Function #2 (MD5 + Hex)
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<?
function decrypt_md5($hex_buf, $key="password")
    {
        $len = strlen($hex_buf);
        for ($i=0; $i<$len; $i+=2)
            $buf .= chr(hexdec(substr($hex_buf, $i, 2)));
        
        $key1 = pack("H*", md5($key));
        while($buf)
        {
           $m = substr($buf, 0, 16);
           $buf = substr($buf, 16);
          
           $c = "";
           for($i=0;$i<16;$i++)
           {
               $c .= $m{$i}^$key1{$i};
           }
          
           $ret_buf .= $m = $c;
           $key1 = pack("H*",md5($key.$key1.$m));
        }
        
        return($ret_buf);
    }
    
    function encrypt_md5($buf, $key="password")
    {
        $key1 = pack("H*",md5($key));
        while($buf)
        {
            $m = substr($buf, 0, 16);
            $buf = substr($buf, 16);
            
            $c = "";
            for($i=0;$i<16;$i++)
            {
                $c .= $m{$i}^$key1{$i};
            }
            $ret_buf .= $c;
            $key1 = pack("H*",md5($key.$key1.$m));
        }
        
        $len = strlen($ret_buf);
        for($i=0; $i<$len; $i++)
            $hex_data .= sprintf("%02x", ord(substr($ret_buf, $i, 1)));
        return($hex_data);
    }
    
    $name = '±èÀç¿ø';
    $enc_name = encrypt_md5($name);
    $dec_name = decrypt_md5($enc_name);
    
    echo "name = {$name}<br>\n";
    echo "encode_name = {$enc_name}<br>\n";
    echo "decode_name = {$dec_name}<br>\n";
?>
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