mac check in GCM failed

[alllexx88]

Hi, I'm getting a mac check in GCM failed error when trying to export saves from Steam version of the game (which includes the DLC saves, if it matters). Here's the debug log from the currently latest 1.3.0.5 version (I also tried older 1.3.0.3-1.3.0.4 versions with similar results):

See the end of this message for details on invoking 
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
Org.BouncyCastle.Crypto.InvalidCipherTextException: mac check in GCM failed
   at Org.BouncyCastle.Crypto.Modes.GcmBlockCipher.DoFinal(Byte[] output, Int32 outOff)
   at DOOMSaveManager.Crypto.DecryptAndVerify(String aad, Byte[] data)
   at DOOMSaveManager.DoomEternalSavePath.Compress(String filename)
   at DOOMSaveManager.Form1.actionOkBtn_Click(Object sender, EventArgs e)
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.Button.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

************** Loaded Assemblies **************
mscorlib
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.4300.0 built by: NET48REL1LAST_C
    CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v4.0.30319/mscorlib.dll
----------------------------------------
DOOM Save Manager
    Assembly Version: 1.3.0.5
    Win32 Version: 1.3.0.5
    CodeBase: file:///D:/Games/DOOMSaveManager%201.3.0.5/DOOM%20Save%20Manager.exe
----------------------------------------
System.Windows.Forms
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.4270.0 built by: NET48REL1LAST_C
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.4300.0 built by: NET48REL1LAST_C
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Drawing
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.4084.0 built by: NET48REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
System.Configuration
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.4190.0 built by: NET48REL1LAST_B
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
----------------------------------------
System.Core
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.4320.0 built by: NET48REL1LAST_C
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll
----------------------------------------
System.Xml
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.4084.0 built by: NET48REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------
ICSharpCode.SharpZipLib
    Assembly Version: 1.2.0.246
    Win32 Version: 1.2.0.246
    CodeBase: file:///D:/Games/DOOMSaveManager%201.3.0.5/ICSharpCode.SharpZipLib.DLL
----------------------------------------
BouncyCastle.Crypto
    Assembly Version: 1.8.5.0
    Win32 Version: 1.8.19031.1
    CodeBase: file:///D:/Games/DOOMSaveManager%201.3.0.5/BouncyCastle.Crypto.DLL
----------------------------------------

************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.

For example:

<configuration>
    <system.windows.forms jitDebugging="true" />
</configuration>

When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.

TIA, Alex

P.S. Seems to be the same as #11

[brunoanc]

Is there by any chance any file in your saves folder that shouldn't be there? I accidentally put idCrypt.exe on it which caused the error, since it tries to decrypt all files.

[alllexx88]

@PowerBall253 Thank you for your reply! Here's the list of all files in the saves dir:

$ find -type f
./999203116
./remote/DLC1-AUTOSAVE3/game.details
./remote/DLC1-AUTOSAVE3/game.details-BACKUP
./remote/DLC1-AUTOSAVE3/game_duration.dat
./remote/DLC1-AUTOSAVE3/game_duration.dat-BACKUP
./remote/GAME-AUTOSAVE0/game.details
./remote/GAME-AUTOSAVE0/game.details-BACKUP
./remote/GAME-AUTOSAVE0/game_duration.dat
./remote/GAME-AUTOSAVE0/game_duration.dat-BACKUP
./remote/game_duration.dat
./remote/PROFILE/profile.bin
./remotecache.vdf

Only saves written by the game, nothing excessive.

[brunoanc]

@alllexx88 isn't that a bash command? have you, in any way, modified any of the files?

[alllexx88]

@PowerBall253 It's Git bash, part of Git GUI for Windows distribution. No, I haven't modified any of the files, and the saves are fully functional.

[GoobyCorp]

If I had a copy of the game I would look into it.

[Hansukie]

I think it's because of the DLC saves. I deleted the DLC Saves and got no more GCM error.