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Peeszdyetc
How do I cheat?
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Joined: 27 Jun 2023
Posts: 4
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 Posted: Sat Jul 01, 2023 2:56 pm Post subject: [Auto Assemble] Generate random number from 0 to K |
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Posting it here because google forward me to this forum firstly but I'm not found a final solution here. Can't even post a link to source because of forum restrictions. You can find the solution on fearlesssrevolution forums by exact same thread name as this.
Source: fearlessrevolution*com/viewtopic.php?f=23&t=25089&p=302778#p302778
| Code: | [Enable]
alloc(start, 2048)
label(originalcode)
label(exit)
label(randomValue)
label(returnhere)
start:
pushad
mov eax, 0x2000001
cpuid
rdtsc
and eax, K
mov [randomValue], eax
popad
originalcode:
mov eax, [randomValue]
mov ebp,eax
mov edi, [...]
exit:
jmp returnhere
randomValue:
dd 0
...:
jmp start
nop 3
returnhere:
[Disable]
dealloc(start)
...
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Csimbi
I post too much
 Reputation: 97
Joined: 14 Jul 2007
Posts: 3326
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| Posted: Sat Jul 01, 2023 7:28 pm Post subject: |
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rdtsc reads a timestamp counter - it's the opposite of random, it's counting up until processor reset.
I'd try the rdrand instruction instead.
| Code: | rdrand ax
rdrand eax
rdrand rax
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All of these are valid. You can use EBX, ECX, or any other register.
Check the Intel Developer's Manual, some conditions apply.
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Dark Byte
Site Admin
 Reputation: 471
Joined: 09 May 2003
Posts: 25814
Location: The netherlands
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| Posted: Sat Jul 01, 2023 11:59 pm Post subject: |
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value & k ?
that means the K can only be 1,3,15,31, etc...
lets say that K is 8, then the only 2 values this random value generator returns is either 0 or 8
i'd do:
| Code: |
call rand //or rdtsc if you prefer
push rdx
div dword ptr [Kvalue] //divide the value in eax by kvalue. The result will be in eax and edx, where eax contains the number of times it can be divided, and edx the result left (which goes from 0 to K-1)
mov [randomValue],edx //put the remainder in randomValue
pop rdx
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