wcx_sii_decrypt

This is a Total Commander plugin for unpacking SII files: save data from SCS games.

Currently tested on Euro Truck Simulator 2 and American Truck Simulator. Supported types:

• encrypted text format (AES);
• plain binary format (BSII);
• encrypted binary format (BSII+AES).

Also, the 3NK format is supported, which is used e.g. for the localization files.

The SII/3NK file is opened as an archive containing a single TXT file representing the plain text contents you can view or extract.

Note:

The TXT file size is displayed as 0 because it is impossible to know the size of the decrypted data without actual decrypting, and this can be quite long. I didn't want to make opening the archive too slow.

Requirements and Dependencies

The project is based on the SII_Decrypt project by František Milt. The DLLs from it are packaged along with the plugin and are used for the actual decrypting and decoding.

The SII_Decrypt DLLs can be updated independently as long as the binary interface remains compatible.

Minimal requirements for the 32-bit version:

• Windows XP SP2
• Total Commander 7.50 32-bit

Minimal requirements for the 64-bit version:

• Processor with 64-bit instruction set (Intel Pentium 4, AMD Athlon 64 and higher)
• Windows XP x64
• Total Commander 8.0 64-bit

Build from Sources

To build the project you need Microsoft Visual Studio 2015 Community Edition. Other versions, like 2013 or 2017, will probably work too but were not tested. Just open the project and build the Release version for Win32 and x64 architectures.

When the SII_Decrypt project updates without breaking compatibility it is enough to just replace the DLL files in the respective subdirectory and the plugin installation package. If API changes were introduced you'll need to perform the following steps:

1. Update the DLL files in the SII_Decrypt subdirectory (Lazarus-built versions are preferred, because they are both 32- and 64-bit).
2. Edit the files SII_Decrypt.h, SII_Decrypt.cpp, SII_Decrypt.def to reflect the changes:
   • The header file contains function definitions ported from the original Pascal header file (Headers\SII_Decrypt_Header.pas).
   • The DEF file lists the exported functions, so you only need to edit it if a function was added or deleted.
   • The CPP file contains fake implementations of the exported functions declared in the H file (needed for generating the correct LIB for the 32-bit version).
3. Update the LIB files by running genlib.cmd (don't forget to fix the path to vcvarsall.bat if you are using a different version of MSVC).
4. Build the main project.

Version history

1.4.0.0, 20.11.2018

• Updated to SII_Decrypt 1.4.2.
• Added experimental support for 3nK format.

1.0.0.0, 23.02.2018

• First public version.