Example 1

Assembly Language Tutorial

Please choose a tutorial page: Fundamentals -- Information about C Tools Registers Simple Instructions Example 1 -- SC CDKey Initial Verification Example 2 -- SC CDKey Shuffle Example 2b -- SC CDKey Final Decode The Stack Stack Example Functions Example 3 -- Storm.dll SStrChr Assembly Summary Machine Code Example 4 -- Smashing the Stack Cracking a Game Example 5 -- Cracking a game Example 6 -- Writing a keygen .dll Injection and Patching Memory Searching Example 7 -- Writing a cheat for Starcraft (1.05) Example 7 Step 1 -- Displaying Messages Example 7 Step 1b -- Above, w/ func ptrs Example 7 Final Example 8 -- Getting IX86.dll files 16-bit Assembly Example 9 -- Keygen for a 16-bit game Example 10 -- Writing a loader

   mov     eax, 3
   mov     esi, ecx
   xor     ecx, ecx
 Top:
   movsx   edx, byte ptr [ecx+esi]
   sub     edx, 30h
   lea     edi, [eax+eax]
   xor     edx, edi
   add     eax, edx
   inc     ecx
   cmp     ecx, 0Ch
   jl      short Top

   xor     edx, edx
   mov     ecx, 0Ah
   div     ecx

   movsx   eax, byte ptr [esi+0Ch]
   add     edx, 30h
   cmp     eax, edx
   jnz     bottom

   mov     eax, 1
   ret

 bottom:
   xor     eax, eax
   ret