Steam Decryption confused.

lmfao · **Joined:** 26 Mar 2009 20:48 **Posts:** 4

Well just wondering why this isn't working. I mean, i think the parameters are outta whack or something, cause nothing is even being passed when i call the function. It may also be the incorrect use of the string builder too.
And yea, the key is correct. Copied it like 5 times over and over from the presented key in steampwd.

Code:

Imports System.Runtime.InteropServices
Imports System.Text

Module SteamDecrypt

    <DllImport("Steam.dll", CallingConvention:=CallingConvention.Cdecl)> _
    Public Function SteamDecryptDataForThisMachine(ByVal encryptedData As String, _
                                                   ByVal encryptedDataSize As Integer, _
                                                   ByVal decryptedBuffer As StringBuilder, _
                                                   ByVal decryptedBufferSize As Integer, _
                                                   ByRef decryptedDataSize As Integer) As Integer
    End Function

    Sub Main(ByVal args() As String)

        Dim encpwd As String = "76487-OEM-0052133-178111555899e-b7b1-4c80-a9a9-11c9e14e01261227403925"
        'string encpwd = 
        Dim decryptedDataSize As Integer = 0
        Dim pwd As New StringBuilder
        pwd.Length = encpwd.Length / 2
        If SteamDecryptDataForThisMachine(encpwd, encpwd.Length, pwd, pwd.Capacity , _
                                          decryptedDataSize) = 0 Then
            Console.WriteLine(Constants.vbLf & " Password: " & pwd.ToString())
        Else
            Console.WriteLine("Error decrypting the Steam Password.")
        End If
        Console.ReadLine()
    End Sub
End Module

aluigi · **Posted:** 26 Mar 2009 21:06

SteamDecryptDataForThisMachine retrieves automatically the machine's key so the encpwd you specified in your example is wrong, it must be not the key but the encrypted password

lmfao · **Joined:** 26 Mar 2009 20:48 **Posts:** 4

OH, so steamdecryptdata actually retreives the key alone? Therefore, what's the password? Cause if that gets the key and parses it in order to decrypt the password, how do you find the password in it's encrypted state? Well i know it's in the clientregistry.blob. But can you explain the routine into getting the location for retreiving the start and end of the encrypted password.
Well that fixed my understanding of the parameters moar =x

aluigi · **Posted:** 27 Mar 2009 00:32

the quick method is fully explained here:

steam-password-recovery-t488.html

lmfao · **Joined:** 26 Mar 2009 20:48 **Posts:** 4

Ahh, okai i found it in hex editor and decrypted it and it found it ^^. But is there a point if you don't even retreive the username login :O

So i would be better off using lens or lengths of the client registry
to search for a certain text such as "phrase" and skips some bytes to start reading the encryptedpass.

SomaFM · **Joined:** 16 Aug 2007 06:25 **Posts:** 367

As for the username, it is stored in the file \Steam\config\SteamAppData.vdf next to "AutoLoginUser"

Here are a few methods of parsing the file: steam-login-recovery-t519.html

Luigi Auriemma

Steam Decryption confused.