The Art of Reversing by Ap0x - Tutoriali.org

00407D90 03C9 ADD ECX,ECX
00407D92 8D0C89 LEA ECX,DWORD PTR DS:[ECX+ECX*4]
00407D95 03F1 ADD ESI,ECX
00407D97 42 INC EDX
00407D98 48 DEC EAX
00407D99 ^ 75 E5 JNZ SHORT NAG-Cryp.00407D80 */
00407D9B - E9 37880000 JMP NAG-Cryp.004105D7 JMP deo 2
Prvi deo ne predstavlja nikakav problem za keygening i evo kako bi on
izgledao u C++:
unsigned int i,esi,cl,edi;
esi = 0x5B8;
for(i=0;i /81EF 99090000 SUB EDI,999
004105AA . |81EF F90F0900 SUB EDI,90FF9
004105B0 . |2BFE
SUB EDI,ESI
004105B2 . |B8 00000000 MOV EAX,0
004105B7 . |81C6 25100000 ADD ESI,1025
004105BD . |6BF6 04
IMUL ESI,ESI,4
004105C0 . |81C6 55050000 ADD ESI,555
004105C6 . |81EF 0000CBFE SUB EDI,FECB0000
004105CC . |03F7
ADD ESI,EDI
/* Bitno
004105CE . |6BF6 04 IMUL ESI,ESI,4 */
004105D1 . |EB 40 JMP SHORT NAG-Cryp.00410613 /* Deo cetiri
I ovo je dosta trivijano i u C-u izgleda ovako:
edi = edi - 0x999;
edi = edi - 0x90FF9;
The Art of Reversing by Ap0x Page 285 of 293