PHP:JSON在使用urldecode和mcrypt时不起作用

当我通过json_decode运行json代码时，它工作得很好，但当我用mcrypt加密并用urlencode编码，然后解码和解密时，它就不工作了

有人知道怎么了吗

解密后的json看起来与加密前的json完全相同

我的代码：

<?
    $json = '{"entry1":{"name":"bob","age":"15"},"entry2":{"name":"bill","age":"50"}}';

    $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
    $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
    $key = "abcdefghijkl";
    $encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $json, MCRYPT_MODE_ECB, $iv);
    $urlencoded = urlencode($encrypted);
    $urldecoded = urldecode($urlencoded);
    $decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $urldecoded, MCRYPT_MODE_ECB, $iv);

    // json and decrypted json comparison
    echo "<h3>JSON & Decrypted JSON look the same:</h3>";
    echo $json . " // json<br>";
    echo $decrypted . " // decrypted json<br>"; 

    // json - works!
    echo "<h3>JSON works:</h3>";
    $data = json_decode($json); 
    $i = 1;

    while ($i <= 2) {
        $entrynumber = "entry" . $i;
        echo "name ----- " . $data->$entrynumber->name . "<br>";
        echo "age ------- " . $data->$entrynumber->age . "<br>";
        $i++;
    }

    // decrypted json - doesnt work!
    echo "<h3>Decrypted JSON doesnt work:</h3>";
    $data = json_decode($decrypted);
    $i = 1;

    while ($i <= 2) {
        $entrynumber = "entry" . $i;
        echo "name ----- " . $data->$entrynumber->name . "<br>";
        echo "age ------- " . $data->$entrynumber->age . "<br>";
        $i++;
    }
?>

如果你把代码粘贴到php文档中，你就会明白我的意思

屏幕截图：

<?
    $json = '{"entry1":{"name":"bob","age":"15"},"entry2":{"name":"bill","age":"50"}}';

    $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
    $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
    $key = "abcdefghijkl";
    $encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $json, MCRYPT_MODE_ECB, $iv);
    $urlencoded = urlencode($encrypted);
    $urldecoded = urldecode($urlencoded);
    $decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $urldecoded, MCRYPT_MODE_ECB, $iv);

    // json and decrypted json comparison
    echo "<h3>JSON & Decrypted JSON look the same:</h3>";
    echo $json . " // json<br>";
    echo $decrypted . " // decrypted json<br>"; 

    // json - works!
    echo "<h3>JSON works:</h3>";
    $data = json_decode($json); 
    $i = 1;

    while ($i <= 2) {
        $entrynumber = "entry" . $i;
        echo "name ----- " . $data->$entrynumber->name . "<br>";
        echo "age ------- " . $data->$entrynumber->age . "<br>";
        $i++;
    }

    // decrypted json - doesnt work!
    echo "<h3>Decrypted JSON doesnt work:</h3>";
    $data = json_decode($decrypted);
    $i = 1;

    while ($i <= 2) {
        $entrynumber = "entry" . $i;
        echo "name ----- " . $data->$entrynumber->name . "<br>";
        echo "age ------- " . $data->$entrynumber->age . "<br>";
        $i++;
    }
?>

---

进行了一些故障排除，我得到的结果如下：

URL编码/解码不是问题所在。编码前和解码后的字符串相同：

编码前：

string 'è?¡OùpU4ˆß•ý£ÉGÒô½åLqe 2w¨”—Ô¢§|MþWþxÎZ±8“єЩɓ ŽšÁkèíSòøÓ€¥ðÒ(³!§¬žIê\&' (length=96)

解码后：

string 'è?¡OùpU4ˆß•ý£ÉGÒô½åLqe 2w¨”—Ô¢§|MþWþxÎZ±8“єЩɓ ŽšÁkèíSòøÓ€¥ðÒ(³!§¬žIê\&' (length=96)

问题出在加密/解密过程中

加密前的Json字符串：

string '{"entry1":{"name":"bob","age":"15"},"entry2":{"name":"bill","age":"50"}}' (length=72)

解密后的Json字符串：

string '{"entry1":{"name":"bob","age":"15"},"entry2":{"name":"bill","age":"50"}}������������������������' (length=96)

请参阅添加到末尾的额外垃圾字符

解密后，如果您这样做是为了删除垃圾字符，那么您的json解码很好：

json_decode(substr($decrypted,0,72));

---

我不太熟悉

mcrypt

，所以希望有人能帮你弄清楚为什么会在末尾增加字符。

你的加密/解密算法正在添加填充以符合块大小。您应该从末尾删除空字符，例如：

---

rtrim（$decrypted，“\0”）
“它不工作”永远不是一个好的错误描述。请描述出现了什么问题，您收到了什么错误消息，等等。我做了解释，请参阅php注释。您能复制粘贴HTML而不是浏览器屏幕截图吗？也许解密后的json字符串中有一些HTML实体，比如“，”或其他类似的东西，谢谢！我整个上午都在试图弄清楚这一点。只是提醒一下，这会让你的应用程序受到填充oracle攻击。你最好在加密前对明文使用PKCS7填充策略，然后再将其剥离。