Difference between revisions of "Example 2b"
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(New page: {{Construction}} <pre>.text:1901B26C mov [esp+6FCh+hashKey], 13AC9741h .text:1901B274 mov ebx, 0Bh .text:1901B279 .text:1901B279 loc_1901B279: ...) |
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{{Construction}} | {{Construction}} | ||
This is the third (and, basically, final) part of the Starcraft CDKey Decode. I'm going to present the code only, not the answer (although you can find the finished product around). This may cover things we haven't talked about (like a function call and local variables, for example). | |||
As usual, esi is a pointer to the cdkey. | |||
<pre>.text:1901B26C mov [esp+6FCh+hashKey], 13AC9741h | <pre>.text:1901B26C mov [esp+6FCh+hashKey], 13AC9741h | ||
| Line 6: | Line 9: | ||
.text:1901B279 | .text:1901B279 | ||
.text:1901B279 loc_1901B279: ; CODE XREF: sub_1901AA30+887�j | .text:1901B279 loc_1901B279: ; CODE XREF: sub_1901AA30+887�j | ||
.text:1901B279 movsx eax, byte ptr [ | .text:1901B279 movsx eax, byte ptr [ebx+esi] | ||
.text:1901B27E push eax ; int | .text:1901B27E push eax ; int | ||
.text:1901B27F call _toupper | .text:1901B27F call _toupper | ||
.text:1901B284 add esp, 4 | .text:1901B284 add esp, 4 | ||
.text:1901B287 cmp al, 37h | .text:1901B287 cmp al, 37h | ||
.text:1901B289 mov byte ptr [ | .text:1901B289 mov byte ptr [ebx+esi], al | ||
.text:1901B28D jg short loc_1901B2A7 | .text:1901B28D jg short loc_1901B2A7 | ||
.text:1901B28F mov ecx, [esp+6FCh+hashKey] | .text:1901B28F mov ecx, [esp+6FCh+hashKey] | ||
| Line 18: | Line 21: | ||
.text:1901B298 xor dl, al | .text:1901B298 xor dl, al | ||
.text:1901B29A shr ecx, 3 | .text:1901B29A shr ecx, 3 | ||
.text:1901B29D mov byte ptr [ | .text:1901B29D mov byte ptr [ebx+esi], dl | ||
.text:1901B2A1 mov [esp+6FCh+hashKey], ecx | .text:1901B2A1 mov [esp+6FCh+hashKey], ecx | ||
.text:1901B2A5 jmp short loc_1901B2B6 | .text:1901B2A5 jmp short loc_1901B2B6 | ||
Revision as of 17:40, 17 November 2008
 This page is under construction. USE AT YOUR OWN RISK! |
This is the third (and, basically, final) part of the Starcraft CDKey Decode. I'm going to present the code only, not the answer (although you can find the finished product around). This may cover things we haven't talked about (like a function call and local variables, for example).
As usual, esi is a pointer to the cdkey.
.text:1901B26C mov [esp+6FCh+hashKey], 13AC9741h .text:1901B274 mov ebx, 0Bh .text:1901B279 .text:1901B279 loc_1901B279: ; CODE XREF: sub_1901AA30+887�j .text:1901B279 movsx eax, byte ptr [ebx+esi] .text:1901B27E push eax ; int .text:1901B27F call _toupper .text:1901B284 add esp, 4 .text:1901B287 cmp al, 37h .text:1901B289 mov byte ptr [ebx+esi], al .text:1901B28D jg short loc_1901B2A7 .text:1901B28F mov ecx, [esp+6FCh+hashKey] .text:1901B293 mov dl, cl .text:1901B295 and dl, 7 .text:1901B298 xor dl, al .text:1901B29A shr ecx, 3 .text:1901B29D mov byte ptr [ebx+esi], dl .text:1901B2A1 mov [esp+6FCh+hashKey], ecx .text:1901B2A5 jmp short loc_1901B2B6 .text:1901B2A7 ; --------------------------------------------------------------------------- .text:1901B2A7 .text:1901B2A7 loc_1901B2A7: ; CODE XREF: sub_1901AA30+85D�j .text:1901B2A7 cmp al, 41h .text:1901B2A9 jge short loc_1901B2B6 .text:1901B2AB mov cl, bl .text:1901B2AD and cl, 1 .text:1901B2B0 xor cl, al .text:1901B2B2 mov byte ptr [esp+ebx+6FCh+cdkey], cl .text:1901B2B6 .text:1901B2B6 loc_1901B2B6: ; CODE XREF: sub_1901AA30+875�j .text:1901B2B6 ; sub_1901AA30+879�j .text:1901B2B6 dec ebx .text:1901B2B7 jns short loc_1901B279