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ArchmageFil
How do I cheat?
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Joined: 01 Dec 2018
Posts: 2
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 Posted: Sat Dec 01, 2018 11:03 pm Post subject: Problem with creating custom value type. |
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Hi, I'm trying to create a type for a game that encrypts the values of variables.
Encryption happens like this:
ror ecx, 07
xor ecx (some key, different every game load)
rol ecx, 15
rol eax, 0B
xor eax, (some key, different every game load)
ror eax, 19
A problem has occurred in passing a key to a type.
I created a script where register Symbol key:
| Code: |
[ENABLE]
[ENABLE]
alloc(newmem,1024)
label(returnhere)
registerSymbol(newmem)
globalAlloc(key,4)
registerSymbol(key)
newmem:
push ebx
mov ebx,[AGE.EXE+1C6020]
mov ebx,[ebx+55120] //cryptkey in ebx
mov [newmem+44],ebx
define(key,newmem+44)
xor ebx,ebx
mov ebx,key
mov [newmem+48],ebx //check key value
pop ebx
mov [ecx+edx*4],eax
mov ecx,[esp+20]
jmp returnhere
"AGE.EXE"+2603F:
jmp newmem
nop
nop
returnhere:
[DISABLE]
dealloc(newmem)
unregisterSymbol(newmem)
unregisterSymbol(key)
dealloc(key)
"AGE.EXE"+2603F:
mov [ecx+edx*4],eax
mov ecx,[esp+20] |
And custom type:
| Code: | alloc(ConvertRoutine,1024)
alloc(ConvertBackRoutine,1024)
alloc(TypeName,256)
alloc(ByteSize,4)
alloc(UsesFloat,1)
alloc(CallMethod,1)
globalalloc(key,4)
TypeName:
db 'AGE.exe',0
ByteSize:
dd 4
UsesFloat:
db 0 //Change to 1 if this custom type should be treated as a float
CallMethod:
db 1 //Remove or change to 0 for legacy call mechanism
ConvertRoutine:
mov eax,[rcx]
rol eax,0B
xor eax,[key]
ror eax,19
ret
ConvertBackRoutine:
ror ecx,07
xor ecx,[key]
rol ecx,15
mov [r8],ecx
ret |
Problem is "key" in ConvertRoutine have value 0, while in other table scripts is all OK. What wrong i don't understand
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OldCheatEngineUser
Whateven rank
 Reputation: 20
Joined: 01 Feb 2016
Posts: 1586
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| Posted: Sun Dec 02, 2018 12:39 am Post subject: |
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| Code: | // custom type
globalalloc(key,4) // key already allocated globally, so all other script have the access to read/write to key ... unlike alloc. |
another way is to debug your code, your calls and passed values. (if there is any)
im not sure why would you ever need to define key as newmem+44 then newmem+48 (its kinda confusing)
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I Use CE Since Version 1.X, And Still Learning How To Use It Well!
Jul 26, 2020
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ArchmageFil
How do I cheat?
![]() Reputation: 0
Joined: 01 Dec 2018
Posts: 2
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| Posted: Sun Dec 02, 2018 1:06 am Post subject: |
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| OldCheatEngineUser wrote: |
another way is to debug your code, your calls and passed values. (if there is any)
im not sure why would you ever need to define key as newmem+44 then newmem+48 (its kinda confusing) |
define only +44, both for easy checking if all OK with value. (i even add another script that write [key] to it allocated memory, again all Ok)
As for custom type code, i already exchanged [key] with real number, like this:
| Code: | mov eax,[rcx]
rol eax,0B
xor eax,04B7382B
ror eax,19
ret
ConvertBackRoutine:
ror ecx,07
xor ecx,04B7382B
rol ecx,15
mov [r8],ecx
ret |
and it work nice, but every game reload = manual editing. There no problem for me, but i just dont understand what wrong, also no way share this for any1.
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Dark Byte
Site Admin
 Reputation: 470
Joined: 09 May 2003
Posts: 25802
Location: The netherlands
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| Posted: Sun Dec 02, 2018 1:59 am Post subject: |
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combine it with a lua script that sets the key value (in ce"s memory,not the game's) when the process gets opened
you can also let lua register the type and use some code to replace the key with a new value before you register it ( registerCustomTypeAutoAssembler )
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