need help: mapleshark incorrect packets

[wubinlzx]

login no problem->image1



selection characters ->image2
start game

this is cms 146
what am I to do

[MentaL]

[wubinlzx]

please help me. thank you

[Novak]

From a PM i got a while back:

I seem to receive this question a lot lol. Anyway, I never finished decrypting the opcode encryption on the outbound packets. However the inbound encryption is very simple:

As soon as you enter the game with a character, you will receive a packet that's 32k~ish in length. As soon as you've received this packet (which contains the outbound opcode encryption information) the inbound traffic's encryption changes. This 32k packet itself, and any inbound traffic after receiving it is encrypted as follows

(C# function for mapleshark, you can put this in MapleAES.cs)

public void SimpleSubtractDecode(byte[] pData) 
        { 
         
            uint dwKey = mIV == null ? 0 : (uint)(mIV[0] | mIV[1] << 8 | mIV[2] << 16 | mIV[3] << 24); 
            uint nRes = dwKey; 
             
            for (uint i = 0; i < pData.Length; ++i) 
            { 
                pData[i] = (byte)(pData[i] - dwKey); 
                nRes = i + 1; 
            } 
        } 

(Ignore the ugly name shit)

Instead of decrypting using AES, you use this function instead. After this function, just like with the AES decrypts, you generate a new IV.

[wubinlzx]

From a PM i got a while back:

I seem to receive this question a lot lol. Anyway, I never finished decrypting the opcode encryption on the outbound packets. However the inbound encryption is very simple:

As soon as you enter the game with a character, you will receive a packet that's 32k~ish in length. As soon as you've received this packet (which contains the outbound opcode encryption information) the inbound traffic's encryption changes. This 32k packet itself, and any inbound traffic after receiving it is encrypted as follows

(C# function for mapleshark, you can put this in MapleAES.cs)

public void SimpleSubtractDecode(byte[] pData) 
        { 
         
            uint dwKey = mIV == null ? 0 : (uint)(mIV[0] | mIV[1] << 8 | mIV[2] << 16 | mIV[3] << 24); 
            uint nRes = dwKey; 
             
            for (uint i = 0; i < pData.Length; ++i) 
            { 
                pData[i] = (byte)(pData[i] - dwKey); 
                nRes = i + 1; 
            } 
        } 

(Ignore the ugly name shit)

Instead of decrypting using AES, you use this function instead. After this function, just like with the AES decrypts, you generate a new IV.

Thank you Reply
How do I use it?
mAES.SimpleSubtractDecode(pBuffer);?
return nRes?

[Fraysa]

Thank you Reply
How do I use it?
mAES.SimpleSubtractDecode(pBuffer);?
return nRes?

Make a boolean that indicates if the 32k packet was received. Once you receive it, set it to true. If it's set, use the method @Novak posted instead of MapleAES's TransformAES.

The method should be called from MapleStream. Place it here:

            if ((pTransformLocale & TransformMethod.AES) != 0) mAES.TransformAES(pBuffer);

[Novak]

just make sure to also decrypt the 32k long one with the new method. It doesn't start after you receive it, it starts as you receive it.

[wubinlzx]

Thank you for your help
The problem has been solved @Novak @Fraysa

[perfect34830069]

Share your source code,thank you!