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  1. #1
    h4x0r
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    Audition 2 SF Decrypting (Need some Help)

    I'm trying write unpacker for this game but need any help. All resource's contained in *.SF archives. They encrypted with custom algorithm. After hour debugging (****ing xTrap -> xCrap) i found algo :

    PHP Code:
    int __usercall A2Decrypt<eax>(int a1int a2)

    A2Decrypt    proc near

    arg_0        
    dword    ptr  4

            push    ebx
            push    ebp
            push    esi
            push    edi
            mov    edi
    eax
            mov    ecx
    edi
            
    and    ecx0FF00h
            mov    edx
    edi
            shl    edx
    10h
            
    or    ecxedx
            shl    ecx
    8
            movzx    edx
    di
            
    or    ecxedx
            
    xor    ecx0B11924E1h
            movsx    esi
    cl
            mov    edx
    ecx
            shr    edx
    8
            movsx    edx
    dl
            mov    ebx
    esi
            mov    ebp
    , [esp+10h+arg_0]
            
    shl    ebx5
            add    ebx
    esi
            add    edx
    ebx
            mov    esi
    edx
            shl    esi
    5
            add    esi
    edx
            mov    edx
    ecx
            shr    edx
    10h
            movsx    edx
    dl
            add    esi
    edx
            shr    ecx
    18h
            mov    edx
    esi
            shl    edx
    5
            add    edx
    esi
            movsx    ecx
    cl
            mov    ebx
    edi
            
    and    ebx3
            mov    eax
    96438AF7h
            lea    ecx
    , [edx+ecx+7C5D0F85h]
            
    mov    [esp+10h+arg_0], ebx
            jz    short loc_401645
            mov    esi
    ebp
            jmp    short loc_401600
    ; ---------------------------------------------------------------------------
            
    db 8Dh,    0A4h24h4 dup(0)
    ; ---------------------------------------------------------------------------
            
    jmp    short loc_401600
    ; ---------------------------------------------------------------------------
            
    align 10h

    loc_401600
    :
            
    mov    edxecx
            
    and    edx0FFh
            add      eax
    A2Key[edx*4]
            
    mov    ebpecx
            not    ebp
            shl    ebp
    15h
            mov    dl
    al
            add    dl
    cl
            
    xor    dl, [esi]
            
    add    ebp2611501h
            shr    ecx
    0Bh
            
    or    ecxebp
            mov    ebp
    eax
            shl    ebp
    5
            add    ebp
    eax
            movzx    eax
    dl
            mov    
    [esi], dl
            add    esi
    1
            sub    ebx
    1
            lea    eax
    , [eax+ebp+3]
            
    jnz    short loc_401600
            sub    edi
    , [esp+10h+arg_0]
            
    mov    ebpesi

    loc_401645
    :
            
    test    ediedi
            mov    esi
    ebp
            jz    short loc_40168B
            jmp    short loc_401650
    ; ---------------------------------------------------------------------------
            
    align 10h

    loc_401650
    :
            
    mov    edxecx
            
    and    edx0FFh
            add    eax
    A2Key[edx*4]
            
    mov    ebxecx
            not    ebx
            shl    ebx
    15h
            lea    edx
    , [ecx+eax]
            xor    
    edx, [esi]
            
    add    ebx3938731h
            shr    ecx
    0Bh
            
    or    ecxebx
            mov    ebx
    eax
            shl    ebx
    5
            add    ebx
    edx
            mov    
    [esi], edx
            add    esi
    4
            sub    edi
    4
            lea    eax
    , [eax+ebx+3]
            
    jnz    short loc_401650

    loc_40168B
    :
            
    pop    edi
            pop    esi
            pop    ebp
            pop    ebx
            retn
    A2Decrypt    endp 
    a1 - size (or length) , a2 - buffer ...

    A2Key (1024)

    PHP Code:
    static unsigned char A2Key[1024] = {
    0xD20x2F0xCF0x9C0x600x290x540x910xDC0xE20xA70x220x390x290x5F,
    0x2F0xE40x1B0xDF0x860xBA0x900xD20xF10x970x870xC20x5D0x040xD8,
    0x4A0x780xE20xFE0x430x130xBD0x920xA90xBE0x890xF80xB00x9E0xC0,
    0x4B0x340xB20xCA0xFF0xA90x3E0x530xC80x8E0x800x0B0x690x280xC0,
    0x140xEA0xAF0xAD0xA70xCA0x680x010x930x390x7A0x9E0xB90xC80x7C,
    0x3A0xA90x620x600x4C0xEC0x880x590xEC0xDB0xC90xD30x200x000x20,
    0x370xA90x520x1A0x520x660x9C0xED0x170x990x730x8A0x0B0x410xEF,
    0x860x300xC50x630xBC0x330x750x060x680xAD0x9B0x3D0x730xA70xFA,
    0xDB0x030xE60xAF0x380x2B0xFE0xE60xDE0x880x620x870x4A0xCF0x2A,
    0xCC0x730x420xA00x580x060x350x920x2D0x7E0xFE0x580x1F0x7D0xAF,
    0xA60xB40x130x080x010xC10x660x960x220xD80x0D0x900x240xA30x56,
    0x6F0x050x110x470x700x840x830x4D0x410x870xD00x680x920x440x76,
    0xC80x270xFA0xFE0xBD0xAF0x830xAD0xE20xED0x880xCC0xE60x1A0xF6,
    0xA80xAD0xE10x6A0xA00x9D0xBF0x870x1D0x650x820x8B0xC30x230x3E,
    0x400x100xC10xE50x550x410xFD0xC80x230xDF0x110xE30x140x100xD6,
    0xDA0x910x7D0x6F0xAB0xE50xE90x120x2F0x030x800xF40xB80x350xA3,
    0x660xDC0x350x430x620xAA0x760x600x210x440x390xB30xE80x330x1C,
    0xB50xA90x210x8D0x770xBA0x5F0x670x040x670x4A0x330x850x620x59,
    0xA10x6E0xC50xFA0xB00xA80xDD0x970x1F0x480x610x300xD00x450xC4,
    0xCB0x300x670xBA0xB80x440xE80xB20x4C0x100xE20x370x670xB00x2D,
    0x9A0x6E0x8E0x880xD60x780x7A0x610xE20xEA0xDC0x930x3A0xE10x59,
    0x0E0x380x2D0x430xA70xE20x030x970xC20x5E0xA80xCF0x0B0xD10x78,
    0x3C0x360x550xD00x0F0xAC0x8F0x3C0xD20x9E0xA40xA00x380x4D0xB8,
    0xA70x7E0xD10x030x1A0x760xA50x570x480x570x500xF40x760x4C0xAB,
    0x340x980x190xED0xD80x680xE50x6E0xFF0xF20x6F0xF20x160x320x31,
    0x750x710x960x5F0xFE0x6C0x470x020xB40x420xDA0x2B0xD30xAC0x0F,
    0xAE0x270x030x370xFC0x950xE20x9E0x9B0x360xD30xDC0xE70xCC0x99,
    0x710x2C0xA10xDE0x7B0x470x270x6A0xCC0x2D0xA30xC30x420x130x6A,
    0x780x540x1F0x0F0xD90xFB0x870xF90xF60x950x760x2A0x830x980xFA,
    0x0E0x2D0x1B0x2F0x5A0x670xE70x270x5F0xB70xF00x800xAA0x010x09,
    0x720xF60x040x660xD30x7E0x7E0xF80x950xED0xB50xC40x710x590xB0,
    0x590x8B0x320x0B0x6B0xE00x4A0x880xF60xAF0x6F0x8D0x640xA40x85,
    0x9D0x0A0x8B0x810xB20x830x960x040x500x420xC10x960xF90x440x73,
    0x2A0x200x210x0D0x4C0x8F0x410xE50x0C0xB50xD20xAA0xE60x6B0xAE,
    0x2F0x8E0xCD0xD10x440xBB0x980x950xF50xF10x870x430xB40xE50xAD,
    0xAB0x950x9D0x3D0x060xAB0x860xE10x0F0x0F0x060x6F0xC40x130xE3,
    0xA90xC50xA10xA40xE80xF30xA20xFC0x490x7D0x3F0xF30x460xD70x2A,
    0x7A0x9A0x790x500x0F0xD90xAC0x370xAD0xA40x890x030x200x160x32,
    0x120xA90x870x010x2B0xFB0x7D0x450x620x880x5D0x8E0x7D0xCF0xDE,
    0x2A0xC90xDC0x030xE60xB30x7D0x1C0x2E0xF20xE30x120xE40x0B0x2B,
    0x640xD00x950x570x9D0x040x7C0x5B0xD40x970xCB0x7C0x4B0x4D0xDB,
    0x8D0xBA0x630x9C0x2A0xA00xC40x5F0x7D0x9D0x840xF60x530xDD0xDD,
    0x450x700xCB0x830x1E0x8E0x710xC00x0B0x020x7D0x110x5E0x1F0x7A,
    0x5E0xA10x100x8F0x0F0x860x710x0F0xA80x2C0x820xE50xFF0xDD0xE6,
    0x270xB10x800x160xF10x0B0x060x940xE20xA60x3B0x110xE90x460xF7,
    0xF60x6E0xEE0x790xEB0x150x480x3A0x550xB80x9C0x260xAF0x290x42,
    0xE30xF60x590x410x940x7E0x880xBE0x380x480x290x2E0xB90xB30x68,
    0xE60x790xAC0xC40xB60x9F0xAB0x060x340xCB0xA70xCC0xDB0x2F0x4F,
    0x670x0B0x420xBA0x3B0x1C0xCE0x780x8E0x0A0x6D0xED0x8F0x6C0xD9,
    0xBC0xA50xC00xF10xB20xDD0x340x730x2F0x640x5D0x8D0x660x8D0x45,
    0xDA0x300xCB0x570x6E0x0B0x1F0xF90x000x000x090xA00x020xC40x53,
    0xE80x8D0xC40xFA0x040xAB0x890xB50x390xE00x7F0x020xCF0x830xED,
    0xFF0xBA0x000xD50xB10xCB0xDD0x660x7B0x3D0xAE0x770x110x1C0x28,
    0x3E0x5C0xFF0xFD0xAD0x7F0x500x5A0xBA0xAA0xC90x280xD50x0A0x4C,
    0x320x550x770x1A0x660x770xA10xAA0x0D0x5E0x910xE90x850x240xF4,
    0x020x260x8D0x2B0x9C0x9B0x960xC00x710x4B0x820xB50xF60x250x4F,
    0x540x7A0x840xEC0xBB0xC10xB90x680x650xF00x560xC70x3A0x810xEE,
    0x6D0xE00x3E0x7C0x6D0x820xD70xE50xC30x1A0x440x800x960x080x3E,
    0xEE0xF70xD30xDE0xE30x410xA50x600x100x9F0x390x110x6B0x860x08,
    0x5E0xA90x510x6C0x790x290x740x8A0x360xA70xC20xC40xCB0xA30x31,
    0x160x8A0x900x1E0xA90xE10xE90x3F0x750xE80xA70xB10x760x8F0x59,
    0x140x7D0xB50xAA0x270x9F0x250x4A0x4C0x2B0xDC0x330xBF0x3A0x34,
    0x190x700x4E0x740xB30x070x490xE80x8B0xE60x9E0x5D0x480x930x22,
    0x620x8E0x8C0x940x4C0xE20x150x0D0x7A0xCC0x610x1F0x750x310xB9,
    0xF80xB60x1A0x9C0x0A0xBE0x7E0x730x2F0x2B0xAD0xC40xF10x990x84,
    0xE70x610x080x690x020x370x280x600xB10x090xAE0x300x9E0xBC0xB3,
    0xBB0x230x410xF70x940xEB0x4F0x140x2F0xB10xD20xB10xDA0x490x15,
    0x070xAD0x220x1A0xDD0x880x950x1D0xC00x0B0x810x4A0x380x7A0x4A,
    0x740xA90x8F0xB7}; 
    IDA PseudoCode

    PHP Code:

    typedef unsigned char _BYTE
    ;
    typedef unsigned int _DWORD;

    int __usercall A2Decrypt(int a1int a2)
    {
      
    int v2// [email protected]
      
    int v3// [email protected]
      
    int v4// [email protected]
      
    int v5// [email protected]
      
    bool v6// [email protected]
      
    int v7// [email protected]
      
    int result// [email protected]
      
    int v9// [email protected]
      
    int v10// [email protected]
      
    int v11// [email protected]
      
    unsigned __int8 v12// [email protected]
      
    int i// [email protected]
      
    int v14// [email protected]
      
    int v15// [email protected]
      
    int v16// [sp+14h] [bp+4h]@1

      
    v2 a1;
      
    v3 a2;
      
    v4 33
         
    * ((char)((((unsigned __int16)a1 | (((a1 << 16) | (unsigned __int16)(a1 0xFF00)) << 8)) ^ 0xB11924E1u) >> 16)
          + 
    33
          
    * (33 * (char)((unsigned __int8)a1 0xE1) + (char)((unsigned __int16)((a1 | ((a1 0xFF00) << 8)) ^ 0x24E1) >> 8)));
      
    v5 = (char)((((unsigned __int16)a1 | (((a1 << 16) | (unsigned __int16)(a1 0xFF00)) << 8)) ^ 0xB11924E1u) >> 24);
      
    v7 a1 3;
      
    v6 = (a1 3) == 0;
      
    result = -1773958409;
      
    v9 v4 v5 2086473605;
      
    v16 v7;
      if ( !
    v6 )
      {
        
    v10 v3;
        do
        {
          
    v11 A2Key[(unsigned __int8)v9] + result;
          
    v12 = *(_BYTE *)v10 ^ (v9 + (_BYTE)v11);
          
    v9 = ((~v9 << 21) + 39916801) | ((unsigned int)v9 >> 11);
          *(
    _BYTE *)v10++ = v12;
          --
    v7;
          
    result v12 33 v11 3;
        }
        while ( 
    v7 );
        
    v2 -= v16;
        
    v3 v10;
      }
      for ( 
    v3v2result v14 v15 32 v14 )
      {
        
    v14 A2Key[(unsigned __int8)v9] + result;
        
    v15 = *(_DWORD *)^ (v9 v14);
        
    v9 = ((~v9 << 21) + 60000049) | ((unsigned int)v9 >> 11);
        *(
    _DWORD *)v15;
        
    += 4;
        
    v2 -= 4;
      }
      return 
    result;

    Trying to use but something wrong. For example first 12 bytes after decrypt should be 4C494643535953454D4554 (LIFCSYSEMET) -> CFILESYSTEM. My unreadable crap -> 2BCF7277CAE9088660E11E33

    Here sweet code

    PHP Code:
        FILE fi fopen(argv[1], "rb");

        
    fseek(fi0SEEK_END);
        
    size_t size ftell(fi);
        
    fseek(fi0SEEK_SET);

        
    char buffer = (char *)malloc(size);

        
    size_t read fread(buffer1sizefi);

        
    A2Decrypt((int)buffer,size);

        
    fclose(fi); 
    here example PseudoCode (how use it game)

    PHP Code:
    signed int __thiscall sub_411FA0(void *this, const char *Filename)
    {
      
    void *v2// [email protected]
      
    FILE *v3// [email protected]
      
    int *v4// [email protected]
      
    char *v5// [email protected]
      
    signed int v6// [email protected]
      
    bool v7// [email protected]
      
    char DstBuf// [sp+8h] [bp-14h]@1
      
    unsigned int v10// [sp+18h] [bp-4h]@1

      
    v10 = (unsigned int)&DstBuf dword_41E3D4// 4C494643535953454D4554 (LIFCSYSEMET) -> CFILESYSTEM
      
    v2 this;
      (*(
    void (**)(void))(*(_DWORD *)this 4))();
      
    v3 fopen(Filename"r+bc");
      *((
    _DWORD *)v2 136) = v3;
      if ( !
    v3 )
        return 
    0;
      
    fread(&DstBuf0xCu1uv3);
      
    A2Decrypt(12, (int)&DstBuf);
      
    v4 = &dword_419E54;
      
    v5 = &DstBuf;
      
    v6 12;
      
    v7 1;
      do
      {
        if ( !
    v6 )
          break;
        
    v7 = *v5++ == *(_BYTE *)v4;
        
    v4 = (int *)((char *)v4 1);
        --
    v6;
      }
      while ( 
    v7 );
      if ( !
    v7 )
      {
        
    fclose(*((FILE **)v2 136));
        *((
    _DWORD *)v2 136) = 0;
        return 
    0;
      }
      (*(
    void (__thiscall **)(void *, _DWORD))(*(_DWORD *)v2 76))(v2"/");
      return 
    1;

    Can someone tell whats wrong and how correct use it?
    here Example archive and C++ project

    Last edited by h4x0r; 2012-06-30 at 03:43 AM.

  2. The Following User Says Thank You to h4x0r For This Useful Post:


  3. #2
    Dwar
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    Nice thing... I like stuff like that. Will download this client and check it.
    Please, post your questions on forum, not by PM or mail

    I spend my time, so please pay a little bit of your time to keep world in equilibrium

  4. #3
    h4x0r
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    I'm finish decrypting. Here source's

    Please register or login to download attachments.


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  6. #4
    Dwar
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    you have stolen from me some fun hours ... Good, so can I remove Audition from agenda?
    Please, post your questions on forum, not by PM or mail

    I spend my time, so please pay a little bit of your time to keep world in equilibrium

  7. #5
    h4x0r
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    It's only test project. Now you can make unpacker! (Inside archive u can found example SF pack)

  8. #6
    alenuar
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    Is there an unpacker? Very need it xD

  9. #7
    liteshield
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    Quote Originally Posted by h4x0r View Post
    I'm finish decrypting. Here source's
    I have tested and its not work for me.
    It decrypt only first 12 bytes of the file.
    When trying to decrypt the rest part of a string or another one it decrypt nothing.
    Even if try to copy first 12 bytes and paste to another place it always decrypt only one word "CFILESYSTEM" (if that is of the beginning of the file).
    In the attachment there is original (decrypted) file "ServerInfo.ini". I don't know where it came from there but it seems that the thing is hopeless.

  10. #8
    kuram4tw
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    good *_*

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