Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
Just some script encoding musings
Function Encode-Script
{
Param(
[Parameter(Position = 0, Mandatory = $True)]
[String]
$Data,
[Parameter(Position = 1, Mandatory = $True)]
[String]
$Key
)
$stub = @'
function Expand-Script($Key)
{
$script = '**ScRiPtGoEsHeRe**'
$Key = $Key.PadRight(32,'X')
$encBytes = [System.Convert]::FromBase64String($script)
if($encBytes.Length -gt 32){
# extract the IV
$IV = $encBytes[0..15];
$AES = New-Object System.Security.Cryptography.AesCryptoServiceProvider;
$AES.Mode = "CBC";
$AES.Key = [system.Text.Encoding]::UTF8.GetBytes($key);
$AES.IV = $IV;
$CompressedData = [System.Text.Encoding]::UTF8.GetString(($AES.CreateDecryptor()).TransformFinalBlock(($encBytes[16..$encBytes.length]), 0, $encBytes.Length-16))
return $(New-Object IO.StreamReader ($(New-Object IO.Compression.DeflateStream ($(New-Object IO.MemoryStream (,$([Convert]::FromBase64String($CompressedData)))), [IO.Compression.CompressionMode]::Decompress)), [Text.Encoding]::ASCII)).ReadToEnd()
}
}
'@
$ms = New-Object IO.MemoryStream
$action = [IO.Compression.CompressionMode]::Compress
$cs = New-Object IO.Compression.DeflateStream ($ms,$action)
$sw = New-Object IO.StreamWriter ($cs, [Text.Encoding]::ASCII)
$Data | ForEach-Object {$sw.WriteLine($_)}
$sw.Close()
# Base64 encode stream
$Data = [Convert]::ToBase64String($ms.ToArray())
$Key = $Key.PadRight(32,'X')
# Make Byte Array
$bytes = $([system.Text.Encoding]::UTF8.GetBytes($Data))
# get a random IV
$IV = [byte] 0..255 | Get-Random -count 16
$AES = New-Object System.Security.Cryptography.AesCryptoServiceProvider
$AES.Mode = "CBC"
$AES.Key = [system.Text.Encoding]::UTF8.GetBytes($Key)
$AES.IV = $IV
$ciphertext = $IV + ($AES.CreateEncryptor()).TransformFinalBlock($bytes, 0, $bytes.Length)
$encryptedData = [Convert]::ToBase64String($ciphertext)
$stub = $stub.replace('**ScRiPtGoEsHeRe**',$encryptedData)
return $stub
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment