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dnsi0
I post too much
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Joined: 04 Jan 2007
Posts: 2674
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 Posted: Mon Aug 20, 2007 10:13 am Post subject: Creating a CRC? |
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| Is there any windows APIs that tell you what the Opcode is at a certain point?
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oib111
I post too much
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Joined: 02 Apr 2007
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Location: you wanna know why?
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| Posted: Mon Aug 20, 2007 11:23 am Post subject: |
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Why don't you just load the program in a decompiler, and find the opcode at that point
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--Pillboi--
Grandmaster Cheater Supreme
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Joined: 06 Mar 2007
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Location: I don't understand the question. Is this a 1 to 10 thing?
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| Posted: Mon Aug 20, 2007 11:36 am Post subject: |
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Because, oib, I'm assuming, seeing as we are in the programming section, that he wants to program his own CRC, either for a useful program, or a crackme.
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atlantis
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| Posted: Mon Aug 20, 2007 11:49 am Post subject: |
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I think you usually take crc with help of a dll or take crc of other file
cause it is hard to know what crc is before it is computed..
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nog_lorp
Grandmaster Cheater
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| Posted: Mon Aug 20, 2007 1:14 pm Post subject: |
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You do it in raw memory (if of your own program) or with ReadProcessMemory.
In C, of the current process, you can read individual program bytes like this:
| Code: | char* address;
address = 0x400000;
char nextbyte() { return (address++)* } |
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assaf84
Expert Cheater
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Joined: 03 Oct 2006
Posts: 238
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| Posted: Wed Aug 22, 2007 7:01 am Post subject: |
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nog, you forgot the casting:
| Code: |
void* address = (void*)0x400000;
BYTE nextByte()
{
address = (void*)((BYTE)address + 1);
return (*(BYTE*)address);
}
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Looks like u used to ASM 
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