如何通过 Powershell 解密 DLC 容器文件的内容？答案

【问题标题】：How to decrypt the content of a DLC container file via Powershell?如何通过 Powershell 解密 DLC 容器文件的内容？
【发布时间】：2023-02-04 23:40:21
【问题描述】：

如何使用 Powershell 解码 DLC 容器文件的主体？

【问题讨论】：

标签： powershell aes jdownloader

【解决方案1】：

今天，我设法编写了一个小型 Powershell sn-p 来解密 DLC 容器文件。它提示输入给定的文件，解密内容并将 URL 放入剪贴板。对于此处的档案，工作示例代码：

# script for decoding a DLC-file:

Remove-Variable * -ea 0
$ErrorActionPreference = 'stop'
$utf8 = [System.Text.Encoding]::UTF8

# file selector:
Add-Type -AssemblyName 'System.Windows.Forms'
$browser = [System.Windows.Forms.OpenFileDialog]::new()
$browser.Filter = 'DLC files (*.dlc)|*.dlc'
$browser.InitialDirectory = "$env:USERPROFILEDownloads"
$null = $browser.ShowDialog()
$fileName = $browser.FileName
if (![System.IO.File]::Exists($fileName)) {break}

$dlc = [System.IO.File]::ReadAllText($fileName)
$len = $dlc.Length
$key = $dlc.Substring($len-88)
$data  = $dlc.Substring(0,$len-88)
$bytes = [System.Convert]::FromBase64String($data)

$aesKey = 'cb99b5cbc24db398'
$aesIV  = '9bc24cb995cb8db3'
$url    = "http://service.jdownloader.org/dlcrypt/service.php?srcType=dlc&destType=pylo&data=$key"

$result = Invoke-WebRequest $url
$rc64 = ([xml]$result.Content).rc
$rc   = [System.Convert]::FromBase64String($rc64)

$aes = [System.Security.Cryptography.Aes]::Create()
$aes.Key = $utf8.GetBytes($aeskey)
$aes.IV  = $utf8.GetBytes($aesIV)
$aes.Padding = [System.Security.Cryptography.PaddingMode]::None
$dec = $aes.CreateDecryptor()
$result = $dec.TransformFinalBlock($rc, 0, $rc.Length)
$dec.Dispose()

$aes.key = $result
$aes.IV  = $result
$dec = $aes.CreateDecryptor()
$enc = $dec.TransformFinalBlock($bytes, 0, $bytes.Length)
$dec.Dispose()

$b64  = $utf8.GetString($enc).Trim([char]0)
$byte = [System.Convert]::FromBase64String($b64)
$xml  = [xml]$utf8.GetString($byte)
$urlList = foreach($url64 in $xml.dlc.content.package.file.url) {
    $urlb = [System.Convert]::FromBase64String($url64)
    $utf8.GetString($urlb)
}

cls
$urlList | Set-Clipboard
$urlList

【讨论】：