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  1. #1
    Dwar
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    Aika Bin files encryption-decryption

    Aika Online .bin encryption-decryption

    Some of the Aika .bin files are encrypted. Here are cipher tables, asm functions and C/Delphi codes for encryption and decryption those files. You can examine them all and try to find something interesting.

    P.S. if it necessary I can make a small app for automatization of (de)encryption process


    ItemList%.bin
    UI/PI.bin


    EDI - length of decryption array
    Algorithm
     004058CE  |> /8BC1          /MOV EAX,ECX
    004058D0 |. |8A99 80B43401 |MOV BL,BYTE PTR DS:[ECX+134B480] ; byte from file
    004058D6 |. |99 |CDQ
    004058D7 |. |F7FF |IDIV EDI
    004058D9 |. |8A92 54565E00 |MOV DL,BYTE PTR DS:[EDX+5E5654] ; load byte from table
    004058DF |. |02D1 |ADD DL,CL ; add counter value
    004058E1 |. |2ADA |SUB BL,DL
    004058E3 |. |8899 80B43401 |MOV BYTE PTR DS:[ECX+134B480],BL ; write new byte to the buffer
    004058E9 |. |41 |INC ECX
    004058EA |. |81F9 00405600 |CMP ECX,00564000 ; cmp with file length
    004058F0 |.^7C DC JL SHORT 004058CE

    cipher table
    Code:
     BE C6 C0 CC C5 DB 20 B8 AE BD BA C6 AE 20 C0 CE
    C4 DA B5 F9 20 B7 E7 C6 BE C0 D4 B4 CF B4 D9 2E
    20 B7 EA B7 E7 20 B6 F6 B6 F3 2E 2E 2E 20 C0 B8
    2E 2E 2E 20 C1 A4 B8 BB 20 C1 A4 B8 BB 20 B1 CD
    C2 FA B4 D9 2E 20 B1 D7 B7 A1 B5 B5 20 C7 D8 BE
    DF C7 CF B4 CF 20 BE EE C2 BF 20 BC F6 20 BE F8
    C1 D2 2E 2E 2E 20


    SkillData%d.bin
    UI/Recipe.bin
    UI/ReinforceW01.bin
    UI/Reinforce2.bin
    UI/Reinforce3.bin
    UI/Easing.bin
    UI/Siege01.bin
    UI/Siege02.bin
    UI/BW.bin
    UI/MakeItems.bin


    Algorithm same as above

    cipher table
    Code:
     C0 CC B0 C5 20 C0 D0 C1 F6 20 B8 B6 BC BC BF E4
    2E 20 C0 D0 C0 B8 B8 E9 20 B3 AA BB DB BB E7 B6
    F7 B5 CB B4 CF B4 D9 2E 20 C1 A6 B9 DF 20 C0 FD
    B4 EB 20 C0 D0 C1 F6 B8 BB B0 ED 20 C2 F8 C7 D1
    20 BB E7 B6 F7 B5 EE B7 CE 20 BB E7 BC BC BF E4
    2E 20 BE C6 BC CC C1 D2 3F 20 C1 C1 C0 BA BC BC
    BB F3 B8 B8 B5 EC BD C3 B4 D9 2E


    UI/curse.bin
     00423468  |> /8A88 300EC101 /MOV CL,BYTE PTR DS:[EAX+1C10E30]
    0042346E |. |40 |INC EAX
    0042346F |. |F6D1 |NOT CL
    00423471 |. |8888 2F0EC101 |MOV BYTE PTR DS:[EAX+1C10E2F],CL
    00423477 |. |3D 00000100 |CMP EAX,10000
    0042347C |.^72 EA JB SHORT 00423468



    UI/MN.bin
     00420052  |> /8A88 50D8AF01 /MOV CL,BYTE PTR DS:[EAX+1AFD850]
    00420058 |. |2AC8 |SUB CL,AL
    0042005A |. |8888 50D8AF01 |MOV BYTE PTR DS:[EAX+1AFD850],CL
    00420060 |. |40 |INC EAX
    00420061 |. |3D 00000400 |CMP EAX,40000
    00420066 |.^7C EA JL SHORT 00420052



    C, Delphi code example
     v4 = 0;
    do
    {
    dword_134B480[v4] -= (_BYTE)v4 + byte_5E5654[v4 % (signed int)(strlen(byte_5E5654) - 1)];
    v4++;
    }


     decryption
    for j:=0 to length(Buffer) - 1 do
    buffer[j] := buffer[j] - (cipherTable[j mod cipherLength] + j);

    encryption
    for j:=0 to length(Buffer) - 1 do
    buffer[j] := buffer[j] + (cipherTable[j mod cipherLength] + j);

    © Dwar


    SkillData.bin + ItemList.bin structure: https://progamercity.net/game-files/...structure.html
    Last edited by Grooguz; 2011-12-11 at 02:42 PM.
    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

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  3. #2
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    Re: Aika Bin files encryption-decryption

    that's what i was asking!!! let me see with my University partners and clubs!!! I ? It!

  4. #3
    azifaralus88
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    Re: Aika Bin files encryption-decryption

    Hi I just want write decrypt script for skills and items to get info about all possible items and write smth like that:
    (files from aika GB version 121)
    Code:
    import os
    out_file = open('B:\python\cipher\out.txt', 'wb')
    
    class ByteFromFile:
    
        def __init__(self, file_name):
            self.file_name = file_name
            self.file = open(self.file_name,'rb')
    
        def GetFileByte(self,byte_num):
            self.byte_num = byte_num
            self.file.seek(self.byte_num)
            return self.file.read(1)
    
        def GetFileSize(self):
            return os.path.getsize(self.file_name)
    
        def __del__(self):
            self.file.close()
    
    Buffer = ByteFromFile('B:\python\cipher\SkillData8.bin')
    Cipher = ByteFromFile('B:\python\cipher\cipher_table_skills.bin')
    
    buffer_lenght = Buffer.GetFileSize()
    cipher_lenght = Cipher.GetFileSize()
    
    for J in range(0,buffer_lenght):
        buffer_byte = ord(Buffer.GetFileByte(J)) #get byte form file
        cipher_byte = ord(Cipher.GetFileByte(J % cipher_lenght)) #get byte from table
        result = buffer_byte-cipher_byte #sub buff byte,table byte
        if result < 0: 
            result = 255 + result
        out_file.write(chr(result))
    
    out_file.close()
    But out file is not ok ( no description just looks more like 'show me all codes from 01 to ff' and do it in separate block of length similar to cipher table )
    What is wrong with that? Can u give me any clue?

    From where is CL in ADD DL,CL ? If I add number of current byte of file to cypher table byte and subtract it from buffer_byte I get just crazy instantly increasing values thats not make sense to me. What is that number?
    Last edited by Grooguz; 2011-12-11 at 02:43 PM.

  5. #4
    Dwar
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    Re: Aika Bin files encryption-decryption

    From where is CL in ADD DL,CL
    from: INC ECX
    Please, post your questions on forum, not by PM or mail

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  6. #5
    azifaralus88
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    Re: Aika Bin files encryption-decryption

    INC ECX is incrementing every time when program is going thru buffer? So if buffer have 60000 bytes we have ECX from 0 to 60000? So we get sth like that - buffer = buffer_value - ( byte from cipher table ( ECX value mod length cipher_table) + ECX value )? So we get instantly increasing number from 0 to 60000 and get instantly greater buffer value and that is crazy nothing come from that ... can u show here an algoritm for that method of crypting , encryptying? Cause :

    Code:
     for j:=0 to length(Buffer) - 1 do
          buffer[j] := buffer[j] - (cipherTable[j mod cipherLength] + j);
    Is not giving proper results ... Ie:

    lenght(buffer) = EA60

    get B18E from buffer where on B18E place is C4 and in cipher table we get first value = BE so

    buffer[B18E] = C4 - (BE + B18E) = wtf ...
    Last edited by Grooguz; 2011-12-11 at 02:43 PM.

  7. #6
    Dwar
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    Re: Aika Bin files encryption-decryption

    If you don't understand simple algorithm, I can't help.
    buffer - array of bytes;
    buffer = buffer_value - ( byte from cipher table ( ECX value mod length cipher_table) + ECX value )
    Incorrect. Should be:
    buffer = buffer_value - ( byte from cipher table ( CL value mod length cipher_table) + CL value )

    Example of decrypted BW.bin in attachment

    Please register or login to download attachments.

    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

  8. #7
    azifaralus88
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    Re: Aika Bin files encryption-decryption

    Ok sorry for taking ur time time to eat assembler and get info how to take cl from ecx etc now for me is a black magic ( 0 assembler before ) and assembler logic too. Still dont know what is what ,what have what lenght etc in that examples lol.

  9. #8
    remka
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    Re: Aika Bin files encryption-decryption

    azifaralus88,
    Come learn assembler from scratch otherwise you will not understand anything at all
    Please write to the PM only at the right issues.
    or if you know what 0x90)))
    P.s.
    it's NOT NOP

  10. #9
    azifaralus88
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    Re: Aika Bin files encryption-decryption

    Yea I understand a bit but all logic together make to big amount thing to connect to create proper image how its work ... Any good scratch to learn from? Is small amount of books about asm on internet btw ...

  11. #10
    Dwar
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    Re: Aika Bin files encryption-decryption

    azifaralus88
    You can check our tutorial / programming section
    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

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