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  1. #1
    h4x0r
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    Super Dancer Online-Xtreme | Season 3 SAI Decrypt

    Victim: here
    Format: SAI

    So we have 2 files:

    1) Datas.sai - FileTable where contained info about Offset's, Size's, FileNames .ect. (Encrypted)
    2) Datas.sac - Main archive where contained game resource's. (Not Encrypted) - You can use any ripper to get files.

    FileTable divided into 2 blocks.

    1st block - Index where contained info (Offset's , Size's, CRC and other)
    2nd block - FileNames strings.

    Structure :

    Full Header Size = 16 Bytes

    Code:
    4 Bytes - SDO\x00
    4 Bytes - TotalFiles inside main archive
    4 Bytes - 2nd Block Size
    4 Bytes - Nulls
    What next. We need decrypt 1st block. How :

    Offset: 0x10
    Size: 2971750 (FileSize) - 16 (Header) - 1911206 (2nd Block Size) = 1060528

    Now decrypt 2nd block.

    Offset: 2971750 (FileSize) - 16 (Header) - 1911206 (2nd Block Size) = 1060528
    Size: 2nd Block Size

    Algo is very simple

    PHP Code:
    int __cdecl SAI_Decrypt(unsigned int szKeyint szBufferunsigned int szBlockSize)
    {
      
    int result;
      
    int i;

      if ( 
    szKey )
      {
        
    result szBuffer;
        for ( 
    szBufferszBlockSize; ++)
        {
          
    szKey *= 15625;
          *(
    BYTE *)-= szKey >> 16;
          
    result 1;
        }
      }
      return 
    result;

    szKey -> 0x7C53F961u

    Example Use:

    PHP Code:
    SAI_Decrypt(0x7C53F961,(int)buffer, (int)buffer size); 
    Now you can use FileTable for extract game resource's with normal filenames

    Test Project Attached (Original FileTable + Decrypted included).

    Please register or login to download attachments.

    Last edited by h4x0r; 2012-08-24 at 06:32 PM.

  2. #2
    h4x0r
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    So unpacker here

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