Rumour Posted January 5, 2007 Share Posted January 5, 2007 How this code for keygen in asm?I must need a way and for chose random digits.Example 4 digit ABCD are random.But only thing: A+B+C+D must 26 (hex)How do? Link to comment
Ziggy Posted January 5, 2007 Share Posted January 5, 2007 (edited) This is a snippet from a keygen for Puma products. In this case I needed just 3 random decimal digits A+B+C = Integer Value. But this code could be extended to four decimal digits A+B+C+D ; ????????????????????????????????????????????????????????????????????????? .data testval dd 0 Val1 dd 0 Val2 dd 0 Val3 dd 0 .code ; ????????????????????????????????????????????????????????????????????????? ; Random ; generate a random number between 0 and nRange-1 Random PROC uses edx ecx nRange: DWORD INVOKE GetTickCount mov ecx, 41C64E6Dh mul ecx add eax, 3039h and eax, 7FFFFFFh mov ecx, nRange sub edx, edx div ecx xchg eax, edx ret Random ENDP ; ????????????????????????????????????????????????????????????????????????? ; sumval is the integer value we want = A+B+C ; output A,B,C Val1,Val2,Val3 GenVals proc sumval :dword tryagain: mov eax, sumval mov testval, eax dec testval invoke Random, testval .if eax > 9 jmp tryagain .endif mov Val1, eax mov eax, sumval sub eax, Val1 mov testval, eax dec testval invoke Random, testval .if eax > 9 jmp tryagain .endif mov Val2, eax mov ebx, Val1 add eax, ebx .if eax >= sumval jmp tryagain .else mov ebx, eax mov eax, sumval sub eax, ebx mov Val3, eax .if eax > 9 jmp tryagain .endif .endif ret GenVals endp ; ????????????????????????????????????????????????????????????????????????? If you code a four digit A+B+C+D = Integer example or find a better way - post it here BTW what is the target for your keygen? Z Edited January 5, 2007 by Ziggy Link to comment
Rumour Posted January 5, 2007 Author Share Posted January 5, 2007 Target is little japan game. Good for learn keygen.INVOKE GetTickCount !!! Stupid, I must think that!Thank much Ziggy. Link to comment
Gyver75 Posted January 7, 2007 Share Posted January 7, 2007 Chineese Little Box, the Ku-Pan Game, isn't true? Link to comment
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