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[ÄíÅ° ¾Ïȣȭ] Function #1 (MD5 + Base64)
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<?
    function encrypt_md5_base64($plain_text, $password="password", $iv_len = 16)
    {
        $plain_text .= "\x13";
        $n = strlen($plain_text);
        if ($n % 16) $plain_text .= str_repeat("\0", 16 - ($n % 16));
        $i = 0;
        while ($iv_len-- >0)
        {
            $enc_text .= chr(mt_rand() & 0xff);
        }
        
        $iv = substr($password ^ $enc_text, 0, 512);
        while($i <$n)
        {
            $block = substr($plain_text, $i, 16) ^ pack('H*', md5($iv));
            $enc_text .= $block;
            $iv = substr($block . $iv, 0, 512) ^ $password;
            $i += 16;
        }
        return base64_encode($enc_text);
    }

    function decrypt_md5_base64($enc_text, $password="password", $iv_len = 16)
    {
        $enc_text = base64_decode($enc_text);
        $n = strlen($enc_text);
        $i = $iv_len;
        $plain_text = '';
        $iv = substr($password ^ substr($enc_text, 0, $iv_len), 0, 512);
        while($i <$n)
        {
            $block = substr($enc_text, $i, 16);
            $plain_text .= $block ^ pack('H*', md5($iv));
            $iv = substr($block . $iv, 0, 512) ^ $password;
            $i += 16;
        }
        return preg_replace('/\x13\x00*$/', '', $plain_text);
    }

    /******************************************/
    $name = '±èÀç¿ø';
    $enc_name = encrypt_md5_base64($name);
    $dec_name = decrypt_md5_base64($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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