AES解密在PHP [英] AES decrypt in php

问题描述

我是新来的AES但是从我发现有几个模式（ECB，CBC等）和不同的模式需要不同的初始化向量的要求，块和编码。我试图去code以下

<$p$p><$c$c>Xrb9YtT7cHUdpHYIvEWeJIAbkxWUtCNcjdzOMgyxJzU/vW9xHivdEDFKeszC93B6MMkhctR35e+YkmYI5ejMf5ofNxaiQcZbf3OBBsngfWUZxfvnrE2u1lD5+R6cn88vk4+mwEs3WoAht1CAkjr7P+fRIaCTckWLaF9ZAgo1/rvYA8EGDc+uXgWv9KvYpDDsCd1JStrD96IACN3DNuO28lVOsKrhcEWhDjAx+yh72wM=

使用PHP和（文本）键043j9fmd38jrr4dnej3FD11111111111与模式CBC和全零IV。我能得到它与这个工具工作，但在PHP中不能得到它。这里是code我使用的：

 函数decrypt_data（$数据，$ IV，$键）{
    $数据= base64_de code（$的数据）;
    $暗号= mcrypt_module_open（MCRYPT_RIJNDAEL_256，''，MCRYPT_MODE_CBC，''）;    //初始化加密处理
    如果（mcrypt_generic_init（$暗号，$键，$ IV）！= -1）{
            //解密
            $解密= mdecrypt_generic（$暗号，$数据）;            // 清理
            mcrypt_generic_deinit（$ CYPHER）;
            mcrypt_module_close（$ CYPHER）;            返回$解密;
    }    返回false;
}
 

我想我可能会丢失与基地64编码或转动钥匙到进位争先的东西。我曾尝试解码很多东西和所有我能产生比较杂乱。任何帮助将是非常美联社preciated。

解决方案

好工具本身并没有说这是究竟如何加密。你不能设置IV要么，所以很难得到正确的参数（因为它们必须相等）。

在一些猜测，我发现了以下工作：

• IV是ppended为密文$ P $


• 密文与AES-128-CBC加密

所以，你必须修改code：

 函数decrypt_data（$数据，$ IV，$键）{
    $暗号= mcrypt_module_open（MCRYPT_RIJNDAEL_128，''，MCRYPT_MODE_CBC，''）;    如果（is_null（$ⅳ））{
        $ ivlen = mcrypt_enc_get_iv_size（$ CYPHER）;
        $ IV = SUBSTR（$的数据，0，$ ivlen）;
        $数据= SUBSTR（$数据，$ ivlen）;
    }    //初始化加密处理
    如果（mcrypt_generic_init（$暗号，$键，$ IV）！= -1）{
            //解密
            $解密= mdecrypt_generic（$暗号，$数据）;            // 清理
            mcrypt_generic_deinit（$ CYPHER）;
            mcrypt_module_close（$ CYPHER）;            返回$解密;
    }    返回false;
}$ CTEXT =Xrb9YtT7cHUdpHYIvEWeJIAbkxWUtCNcjdzOMgyxJzU / vW9x。
         HivdEDFKeszC93B6MMkhctR35e + YkmYI5ejMf5ofNxaiQcZb。
         f3OBBsngfWUZxfvnrE2u1lD5 + R6cn88vk4 + mwEs3WoAh​​t1CA。
         kjr7P + fRIaCTckWLaF9ZAgo1 / rvYA8EGDc + uXgWv9KvYpDDs。
         Cd1JStrD96IACN3DNuO28lVOsKrhcEWhDjAx + yh72wM =;$键=043j9fmd38jrr4dnej3FD11111111111;$解析度= decrypt_data（base64_de code（$ CTEXT），空，$键）;
 

我不知道为什么密钥长度不用于将它与AES-256-CBC加密 - 我已经签出的源的 as3crypto库以及它种的支持，但我将不得不调试它真正验证它。

I am new to AES but from what I have found there are several modes (ECB,CBC, etc.) and different modes need different initialization vector requirements, blocks, and encodings. I am trying to decode the following

Xrb9YtT7cHUdpHYIvEWeJIAbkxWUtCNcjdzOMgyxJzU/vW9xHivdEDFKeszC93B6MMkhctR35e+YkmYI5ejMf5ofNxaiQcZbf3OBBsngfWUZxfvnrE2u1lD5+R6cn88vk4+mwEs3WoAht1CAkjr7P+fRIaCTckWLaF9ZAgo1/rvYA8EGDc+uXgWv9KvYpDDsCd1JStrD96IACN3DNuO28lVOsKrhcEWhDjAx+yh72wM=

using php and the (text) key "043j9fmd38jrr4dnej3FD11111111111" with mode CBC and an IV of all zeros. I am able to get it to work with this tool but can't get it in php. Here is the code I am using:

function decrypt_data($data, $iv, $key) {
    $data   = base64_decode($data);
    $cypher = mcrypt_module_open(MCRYPT_RIJNDAEL_256, '', MCRYPT_MODE_CBC, '');

    // initialize encryption handle
    if (mcrypt_generic_init($cypher, $key, $iv) != -1) {
            // decrypt
            $decrypted = mdecrypt_generic($cypher, $data);

            // clean up
            mcrypt_generic_deinit($cypher);
            mcrypt_module_close($cypher);

            return $decrypted;
    }

    return false;
} 

I think I may be missing something relating to base 64 encoding or turning the key into binary first. I have tried decoding many things and all I can produce is gibberish. Any help would be very appreciated.

解决方案

Well the tool itself does not say how exactly it's encrypted. And you can't set the IV either so it's hard to get the parameters right (because they have to be equal).

After some guesswork I found out the following:

• The IV is prepended to the ciphertext
• The ciphertext is encrypted with aes-128-cbc

So you have to modify the code:

function decrypt_data($data, $iv, $key) {
    $cypher = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');

    if(is_null($iv)) {
        $ivlen = mcrypt_enc_get_iv_size($cypher);
        $iv = substr($data, 0, $ivlen);
        $data = substr($data, $ivlen);
    }

    // initialize encryption handle
    if (mcrypt_generic_init($cypher, $key, $iv) != -1) {
            // decrypt
            $decrypted = mdecrypt_generic($cypher, $data);

            // clean up
            mcrypt_generic_deinit($cypher);
            mcrypt_module_close($cypher);

            return $decrypted;
    }

    return false;
}

$ctext = "Xrb9YtT7cHUdpHYIvEWeJIAbkxWUtCNcjdzOMgyxJzU/vW9x" .
         "HivdEDFKeszC93B6MMkhctR35e+YkmYI5ejMf5ofNxaiQcZb" .
         "f3OBBsngfWUZxfvnrE2u1lD5+R6cn88vk4+mwEs3WoAht1CA" .
         "kjr7P+fRIaCTckWLaF9ZAgo1/rvYA8EGDc+uXgWv9KvYpDDs" .
         "Cd1JStrD96IACN3DNuO28lVOsKrhcEWhDjAx+yh72wM=";

$key = "043j9fmd38jrr4dnej3FD11111111111";

$res = decrypt_data(base64_decode($ctext), null, $key);

I'm not sure why the key length is not used to encrypt it with aes-256-cbc - I've checked out the source of that as3crypto-library and it kind of supported it, but I would have to debug it to really verify it.

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