用十六进制键从十六进制数据解密3des [英] Decrypting 3des from hex data with a hex key

问题描述

我正在尝试使用mycrypt php库来解密以下内容：

I am trying to use the mycrypt php library to decrypt the following:

密钥： aaaaaaaabbbbbbbccccccccdddddddd

Key: aaaaaaaabbbbbbbbccccccccdddddddd

数据： b5057bbc04b842a96144a0f617f2820e

Data: b5057bbc04b842a96144a0f617f2820e

预期结果 Test123123

Expected Result: Test123123

使用模式ECB对3DES进行数据加密。我正在使用的代码将十六进制值解密为e2119b734b5050e3，转换为sKPPã。我已经尝试使用打开ssl返回False。

The data is encrypted with 3DES with the mode ECB. The code I'm currently working with decrypts the hex value to "e2119b734b5050e3" which translates to "â›sKPPã". I have tried using open ssl which is returning "False".

代码如下：

（PHP版本5.3.3）

(PHP Version 5.3.3)

$key = 'aaaaaaaabbbbbbbbccccccccdddddddd';
$key = pack('H*',$key);

// DATA
$data = 'b5057bbc04b842a96144a0f617f2820e';
$data = pack('H'.strlen($key),$data);

// DECRYPT MCRYPT
$data = rtrim(mcrypt_decrypt(MCRYPT_3DES, $key, $data, MCRYPT_MODE_ECB), "\0");
$decryptedHex = unpack('H*',$data);

// DECRYPT OPEN SSL (RETURNS FALSE)
$result = openssl_decrypt($data,'des-ede3', $key);

// ECHO
echo $decryptedHex[1];

推荐答案

这里的问题是缺少信息太多 - 3DES的确切变体，填充信息。有一点点加密选项，而不是解密可以尝试生成密文找到正确的选项。他们原来是

The problem here is that there is too much missing information - the exact variant of 3DES, the padding info. With a little fiddling with encrypting options, rather than decrypting one can try to generate the ciphertext to find the correct options. They turn out to be

openssl_encrypt($ptext,'des-ede', $key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING)

其中 $ ptext 是 Test123123\0\0\0\0\0\0

密文可以类似地通过

$result = openssl_decrypt($data,'des-ede', $key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING);

您将需要升级到更新和支持（PHP 5.3于2009年发布，不是更长时间支持到2015年）版本的PHP。

You will need to upgrade to a more recent and supported (PHP 5.3 was released in 2009 and is no longer supported as of 2015) version of PHP.

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