【关键字】：C,24,V2,OpenCanvas,V2,24
【来 源】：网络
[原创]算法浅探——OpenCanvas V2.24 汉化版(1)
应用平台： Win9x/NT/2000/XP
加入时间： 2003-04-24 10:55:33
下载次数： 376
推荐等级： ****
开 发 商： http://poo.webfeng.net/poobbs/
【软件简介】：OpenCanvas 让使用者在使用电脑绘图时，就像是在纸上手绘一样，可以画出极为细致的图形。
【软件限制】：NAG、功能限制。
【作者声明】：初学Crack，只是感兴趣，没有其它目的。失误之处敬请诸位大侠赐教！
【破解工具】：TRW2000娃娃修改版、Ollydbg1.09、PEiD、W32Dasm 9.0白金版
—————————————————————————————————
【过 程】：
从 天空 下载的 笨鸡 汉化的中文版。
oC224e.exe 无壳，可能让汉化者代脱了。Delphi 编写。
算法不太难，只是太麻烦了。幸好作者没有再来几个循环互相校验。
试炼码：12345678-ABCD-EFGHIJKL
—————————————————————————————————
:004AD817 E8BCD6FBFF call 0046AED8
:004AD81C 8D55E0 lea edx, dword ptr [ebp-20]
:004AD81F 8B83DC020000 mov eax, dword ptr [ebx+000002DC]
:004AD825 E8522DF8FF call 0043057C
:004AD82A 8B45E0 mov eax, dword ptr [ebp-20]
====>EAX=12345678-ABCD-EFGHIJKL
:004AD82D E8EE65F5FF call 00403E20
====>取试炼码长度
:004AD832 BA16000000 mov edx, 00000016
====>EDX=16（H）=22（D）
:004AD837 E86836F7FF call 00420EA4
====>比较试炼码是否是22位？
:004AD83C 50 push eax
:004AD83D 8D55DC lea edx, dword ptr [ebp-24]
:004AD840 8B83DC020000 mov eax, dword ptr [ebx+000002DC]
:004AD846 E8312DF8FF call 0043057C
:004AD84B 8B45DC mov eax, dword ptr [ebp-24]
:004AD84E E89167F5FF call 00403FE4
:004AD853 8BD0 mov edx, eax
:004AD855 8BC6 mov eax, esi
:004AD857 59 pop ecx
:004AD858 E8D3D6FBFF call 0046AF30
:004AD85D 8BC6 mov eax, esi
====>EAX=12345678-ABCD-EFGHIJKL
:004AD85F E8E0740400 call 004F4D44
====>关键CALL 一！进入！
:004AD864 8983E0020000 mov dword ptr [ebx+000002E0], eax
====>上面的CALL里运算，正确则EAX返回1或3。
====>否则后面004AD893处会让你大叫的。^Q^^Q^
:004AD86A 83BBE0020000FF cmp dword ptr [ebx+000002E0], FFFFFFFF
:004AD871 744C je 004AD8BF
====>跳则OVER！
:004AD873 8D45FE lea eax, dword ptr [ebp-02]
:004AD876 50 push eax
:004AD877 8D45FF lea eax, dword ptr [ebp-01]
:004AD87A 50 push eax
:004AD87B 56 push esi
:004AD87C E8D67E0400 call 004F5757
====>关键CALL 二！进入！
:004AD881 83C40C add esp, 0000000C
:004AD884 84C0 test al, al
:004AD886 7437 je 004AD8BF
====>跳则OVER！
:004AD888 56 push esi
:004AD889 E86B7F0400 call 004F57F9
====>关键CALL 三！进入！
:004AD88E 59 pop ecx
:004AD88F 84C0 test al, al
:004AD891 742C je 004AD8BF
====>跳则OVER！
:004AD893 8B83E0020000 mov eax, dword ptr [ebx+000002E0]
====>此处就是检查你4AD85F里的选择了，如果你进了陷阱……
:004AD899 83F801 cmp eax, 00000001
====>[ebx+000002E0]是否是1？呵呵，我的是。
:004AD89C 7415 je 004AD8B3
====>跳！我的选择！
:004AD89E 83F803 cmp eax, 00000003
====>[ebx+000002E0]是否是3？另个选择！
:004AD8A1 7410 je 004AD8B3
====>此处再不跳就OVER！
:004AD8A3 33C9 xor ecx, ecx
:004AD8A5 33D2 xor edx, edx
* Possible StringData Ref from Code Obj ->"Region code mismatch!"
====>很让人难受的一句话！*o* *o*
:004AD8A7 B82CD94A00 mov eax, 004AD92C
:004AD8AC E82F6D0500 call 005045E0
:004AD8B1 EB40 jmp 004AD8F3
* Referenced by a (U)nconditional or (C)onditional Jump at Addresses:
|:004AD89C(C), :004AD8A1(C)
|
:004AD8B3 C7833402000001000000 mov dword ptr [ebx+00000234], 00000001
:004AD8BD EB34 jmp 004AD8F3
* Referenced by a (U)nconditional or (C)onditional Jump at Addresses:
|:004AD871(C), :004AD886(C), :004AD891(C)
|
:004AD8BF FF83E4020000 inc dword ptr [ebx+000002E4]
:004AD8C5 8D55D8 lea edx, dword ptr [ebp-28]
* Possible StringData Ref from Code Obj ->"预P"
|
:004AD8C8 A14C995000 mov eax, dword ptr [0050994C]
:004AD8CD E8C27FF5FF call 00405894
:004AD8D2 8B45D8 mov eax, dword ptr [ebp-28]
:004AD8D5 33C9 xor ecx, ecx
:004AD8D7 33D2 xor edx, edx
:004AD8D9 E8026D0500 call 005045E0
:004AD8DE 8BC3 mov eax, ebx
:004AD8E0 E8F7FEFFFF call 004AD7DC
:004AD8E5 84C0 test al, al
:004AD8E7 740A je 004AD8F3
:004AD8E9 C7833402000002000000 mov dword ptr [ebx+00000234], 00000002
* Referenced by a (U)nconditional or (C)onditional Jump at Addresses:
|:004AD8B1(U), :004AD8BD(U), :004AD8E7(C)
|
:004AD8F3 33C0 xor eax, eax
:004AD8F5 5A pop edx
:004AD8F6 59 pop ecx
:004AD8F7 59 pop ecx
:004AD8F8 648910 mov dword ptr fs:[eax], edx
:004AD8FB 681DD94A00 push 004AD91D
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:004AD91B(U)
|
:004AD900 8D45D8 lea eax, dword ptr [ebp-28]
:004AD903 E89862F5FF call 00403BA0
:004AD908 8D45DC lea eax, dword ptr [ebp-24]
:004AD90B BA02000000 mov edx, 00000002
:004AD910 E8AF62F5FF call 00403BC4
:004AD915 C3 ret
这些代码用了我一个下午的时间来分析，一个晚上的时间来整理呀。
哎，毅力和细心真的很重要。虽然我很菜，但或许勤能补拙呀。^O^^O^
—————————————————————————————————
●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●
关键CALL一 开 始
进入关键CALL：004AD85F call 004F4D44
* Referenced by a CALL at Addresses:
|:004AD85F , :004ADDA2 , :004C5D56 , :004C77B2 , :004C77FA
|:004D2794 , :004D30BC , :004D3469 , :004D493F , :004D4BDA
|:004D4E7D
|
:004F4D44 53 push ebx
:004F4D45 8BD8 mov ebx, eax
:004F4D47 53 push ebx
:004F4D48 E894070000 call 004F54E1
====>呵呵，陷阱呀！
:004F4D4D 59 pop ecx
:004F4D4E 84C0 test al, al
:004F4D50 7404 je 004F4D56
:004F4D52 33C0 xor eax, eax
:004F4D54 5B pop ebx
:004F4D55 C3 ret
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:004F4D50(C)
|
:004F4D56 53 push ebx
:004F4D57 E8A2070000 call 004F54FE
====>关键CALL！①进入！
:004F4D5C 59 pop ecx
:004F4D5D 84C0 test al, al
:004F4D5F 7407 je 004F4D68
====>跳则进行其它可能的注册码组合比较！
:004F4D61 B801000000 mov eax, 00000001
====>我以第二个组合为目的，所以需要此处置1！
:004F4D66 EB39 jmp 004F4DA1
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:004F4D5F(C)
|
:004F4D68 53 push ebx
:004F4D69 E8AD070000 call 004F551B
====>呵呵，陷阱呀！
:004F4D6E 59 pop ecx
:004F4D6F 84C0 test al, al
:004F4D71 7407 je 004F4D7A
:004F4D73 B802000000 mov eax, 00000002
:004F4D78 EB27 jmp 004F4DA1
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:004F4D71(C)
|
:004F4D7A 53 push ebx
:004F4D7B E8B8070000 call 004F5538
====>呵呵，还有这个可以用。
:004F4D80 59 pop ecx
:004F4D81 84C0 test al, al
:004F4D83 7407 je 004F4D8C
:004F4D85 B803000000 mov eax, 00000003
:004F4D8A EB15 jmp 004F4DA1
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:004F4D83(C)
|
:004F4D8C 53 push ebx
:004F4D8D E8C3070000 call 004F5555
====>呵呵，陷阱呀！
:004F4D92 59 pop ecx
:004F4D93 84C0 test al, al
:004F4D95 7407 je 004F4D9E
:004F4D97 B804000000 mov eax, 00000004
:004F4D9C EB03 jmp 004F4DA1
* Referenced by a (U)nconditional or (C)onditional Jump at Addresses:
|:004F4D39(C), :004F4D95(C)
|
:004F4D9E 83C8FF or eax, FFFFFFFF
* Referenced by a (U)nconditional or (C)onditional Jump at Addresses:
|:004F4D66(U), :004F4D78(U), :004F4D8A(U), :004F4D9C(U)
|
:004F4DA1 5B pop ebx
:004F4DA2 C3 ret
—————————————————————————————————
进入关键CALL①：004F4D57 call 004F54FE
* Referenced by a CALL at Address:
|:004F4D57
|
:004F54FE 8B442404 mov eax, dword ptr [esp+04]
====>EAX=12345678-ABCD-EFGHIJKL 试炼码
:004F5502 80780145 cmp byte ptr [eax+01], 45
====>试炼码第2位是否是E？
:004F5506 7510 jne 004F5518
:004F5508 80780331 cmp byte ptr [eax+03], 31
====>试炼码第4位是否是1？
:004F550C 750A jne 004F5518
:004F550E 50 push eax
:004F550F E872FFFFFF call 004F5486
====>关键CALL！②进入！
:004F5514 83C404 add esp, 00000004
:004F5517 C3 ret
我的试炼码12345678-ABCD-EFGHIJKL调整为：1E315678-ABCD-EFGHIJKL
—————————————————————————————————
进入关键CALL②：004F550F call 004F5486
* Referenced by a CALL at Addresses:
|:004F54F2 , :004F550F , :004F552C , :004F5549 , :004F5566
|
:004F5486 56 push esi
:004F5487 8B742408 mov esi, dword ptr [esp+08]
:004F548B B02D mov al, 2D
====>AL=2D 即：-
:004F548D 384608 cmp byte ptr [esi+08], al
====>试炼码第9位是否是-
:004F5490 754B jne 004F54DD
====>跳则OVER！
:004F5492 38460D cmp byte ptr [esi+0D], al
====>试炼码第14位是否是-
:004F5495 7546 jne 004F54DD
====>跳则OVER！
:004F5497 0FBE06 movsx eax, byte ptr [esi]
====>取试炼码第1位字符的HEX值
:004F549A 83F841 cmp eax, 00000041
====>第1位不能小于41
:004F549D 7C3E jl 004F54DD
====>跳则OVER！
:004F549F 83F85A cmp eax, 0000005A
====>第1位不能大于5A 即：第1位须是大写字母。
:004F54A2 7F39 jg 004F54DD
====>跳则OVER！
:004F54A4 0FBE4609 movsx eax, byte ptr [esi+09]
====>取试炼码第10位字符的HEX值
:004F54A8 83F841 cmp eax, 00000041
:004F54AB 7C30 jl 004F54DD
:004F54AD 83F85A cmp eax, 0000005A
:004F54B0 7F2B jg 004F54DD
====>同上面一样，第10位应是大写字母！
:004F54B2 0FBE460F movsx eax, byte ptr [esi+0F]
====>取试炼码第16位字符的HEX值
:004F54B6 83F841 cmp eax, 00000041
:004F54B9 7C22 jl 004F54DD
:004F54BB 83F85A cmp eax, 0000005A
:004F54BE 7F1D jg 004F54DD
====>同上面一样，第16位应是大写字母！
所以，第1、10、16位必须是大写字母！
我的试炼码12345678-ABCD-EFGHIJKL调整为：AE315678-ABCD-EFGHIJKL
:004F54C0 56 push esi
:004F54C1 E84CFFFFFF call 004F5412
====>关键CALL③！进入！
:004F54C6 0FBE4E15 movsx ecx, byte ptr [esi+15]
====>取试炼码第22位字符的HEX值4C
:004F54CA 25FF000000 and eax, 000000FF
:004F54CF 83C404 add esp, 00000004
:004F54D2 33D2 xor edx, edx
:004F54D4 3BC8 cmp ecx, eax
====>ECX=4C 试炼码第22位字符的HEX值
====>EAX=34 上面4F54C1处运算得出的值
====>所以注册码的第22位应是4
因此把试炼码AE315678-ABCD-EFGHIJKL再次修改为AE315678-ABCD-EFGHIJK4
当然，我只是在Ollydbg中修改了寄存器的值，不用再重新LOAD，那样太麻烦了。^O^^O^
:004F54D6 0F94C2 sete dl
====>根据比较结果设置DL的值 应为TRUE 即：01
:004F54D9 8AC2 mov al, dl
:004F54DB 5E pop esi
:004F54DC C3 ret
* Referenced by a (U)nconditional or (C)onditional Jump at Addresses:
|:004F5490(C), :004F5495(C), :004F549D(C), :004F54A2(C), :004F54AB(C)
|:004F54B0(C), :004F54B9(C), :004F54BE(C)
|
:004F54DD 32C0 xor al, al
====>跳到此处清0就OVER了！
:004F54DF 5E pop esi
:004F54E0 C3 ret
—————————————————————————————————
进入关键CALL③：004F54C1 call 004F5412
* Referenced by a CALL at Address:
|:004F54C1
|
:004F5412 8B442404 mov eax, dword ptr [esp+04]
====>EAX=AE315678-ABCD-EFGHIJKL 试炼码
:004F5416 8A480F mov cl, byte ptr [eax+0F]
====>CL=46 取试炼码第16位字符的HEX值
:004F5419 8A5009 mov dl, byte ptr [eax+09]
====>DL=41 取试炼码第10位字符的HEX值
:004F541C 8A00 mov al, byte ptr [eax]
====>AL=41 取试炼码第1 位字符的HEX值
:004F541E 03CA add ecx, edx
====>ECX=46 + 41=00DACE87
:004F5420 8D4C01FC lea ecx, dword ptr [ecx+eax-04]
====>ECX=00DACE87 + 0082F131 - 04=015DBFB4
:004F5424 83E10F and ecx, 0000000F
====>ECX=015DBFB4 AND 0000000F=4
:004F5427 8A8144905000 mov al, byte ptr [ecx+00509044]
====>根据ECX值从[00509044]的表中取值！
====>AL=34 将和试炼码的第22位比较！
☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆
[00509044]内存中是一张表：
00509044 30 31 32 33 34 35 36 37 38 39 41 42 43 44 45 46 0123456789ABCDEF
☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆
:004F542D C3 ret
小结：第1、10、16位字母的HEX值的低位相加再减4，以此为指针从[00509044]内存中的表中取值
1+2+6-4=4 [00509044 + 4]处是34，34和第22位比较，所以第22位是 4
关键CALL一 结束
●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●●
□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□
关键CALL二 开 始
* Referenced by a CALL at Addresses:
|:004AD87C , :004ADE71 , :004C5E25 , :004C77C5 , :004C7812
|:004D2863 , :004D318B , :004D3538 , :004D4A0E , :004D4CA9
|:004D4F4C
|
:004F5757 53 push ebx
:004F5758 56 push esi
:004F5759 8B74240C mov esi, dword ptr [esp+0C]
====>ESI=AE315678-ABCD-EFGHIJK4 试炼码
:004F575D 0FBE460C movsx eax, byte ptr [esi+0C]
====>EAX=44 取试炼码第13位字符的HEX值
:004F5761 83F830 cmp eax, 00000030
:004F5764 7C0A jl 004F5770
:004F5766 83F839 cmp eax, 00000039
:004F5769 7F05 jg 004F5770
:004F576B 83C0D0 add eax, FFFFFFD0
====>如果第13位字符是数字则此处-30
:004F576E EB0D jmp 004F577D
* Referenced by a (U)nconditional or (C)onditional Jump at Addresses:
|:004F5764(C), :004F5769(C)
|
:004F5770 83F841 cmp eax, 00000041
:004F5773 7C7F jl 004F57F4
:004F5775 83F85A cmp eax, 0000005A
:004F5778 7F7A jg 004F57F4
:004F577A 83C0C9 add eax, FFFFFFC9
====>如果第13位字符是字母则此处-37
====>EAX=44 - 37=D
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:004F576E(U)
|
:004F577D 8944240C mov dword ptr [esp+0C], eax
====>[esp+0C]=EAX
:004F5781 0FBE4612 movsx eax, byte ptr [esi+12]
====>EAX=49 取试炼码第19位字符的HEX值
:004F5785 83F830 cmp eax, 00000030
:004F5788 7C0A jl 004F5794
:004F578A 83F839 cmp eax, 00000039
:004F578D 7F05 jg 004F5794
:004F578F 8D58D0 lea ebx, dword ptr [eax-30]
====>如果第19位字符是数字则此处-30
:004F5792 EB0D jmp 004F57A1
* Referenced by a (U)nconditional or (C)onditional Jump at Addresses:
|:004F5788(C), :004F578D(C)
|
:004F5794 83F841 cmp eax, 00000041
:004F5797 7C5B jl 004F57F4
:004F5799 83F85A cmp eax, 0000005A
:004F579C 7F56 jg 004F57F4
:004F579E 8D58C9 lea ebx, dword ptr [eax-37]
====>如果第19位字符是字母则此处-37
====>EBX=49 - 37=12
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:004F5792(U)
|
:004F57A1 56 push esi
:004F57A2 E8B3FCFFFF call 004F545A
====>关键CALL！④进入！
:004F57A7 0FBE4E14 movsx ecx, byte ptr [esi+14]
====>ECX=4B 取试炼码第21位字符的HEX值
:004F57AB 25FF000000 and eax, 000000FF
:004F57B0 83C404 add esp, 00000004
:004F57B3 3BC8 cmp ecx, eax
====>ECX=4B 试炼码第21位字符的HEX值
====>EAX=44 上面4F54C1处运算得出的值
====>所以注册码的第21位应是D
因此把试炼码AE315678-ABCD-EFGHIJK4再次修改为AE315678-ABCD-EFGHIJD4
:004F57B5 753D jne 004F57F4
:004F57B7 8B44240C mov eax, dword ptr [esp+0C]
====>EAX=0D 取试炼码第21位字符的HEX值
:004F57BB 83C341 add ebx, 00000041
====>EBX=12 + 41=53
:004F57BE 83C041 add eax, 00000041
====>EAX=0D + 41=4E
:004F57C1 50 push eax
:004F57C2 89442410 mov dword ptr [esp+10], eax
:004F57C6 E8DBFBFFFF call 004F53A6
====>CALL⑤！进入！
:004F57CB 83C404 add esp, 00000004
:004F57CE 84C0 test al, al
:004F57D0 7422 je 004F57F4
:004F57D2 53 push ebx
:004F57D3 E8CEFBFFFF call 004F53A6
====>CALL⑥！进入！
:004F57D8 83C404 add esp, 00000004
:004F57DB 84C0 test al, al
:004F57DD 7415 je 004F57F4
:004F57DF 8B542410 mov edx, dword ptr [esp+10]
:004F57E3 8A44240C mov al, byte ptr [esp+0C]
====>AL=4E
:004F57E7 8B4C2414 mov ecx, dword ptr [esp+14]
:004F57EB 5E pop esi
:004F57EC 8802 mov byte ptr [edx], al
:004F57EE B001 mov al, 01
:004F57F0 8819 mov byte ptr [ecx], bl
====>[ECX]=BL=53
:004F57F2 5B pop ebx
:004F57F3 C3 ret
* Referenced by a (U)nconditional or (C)onditional Jump at Addresses:
|:004F5773(C), :004F5778(C), :004F5797(C), :004F579C(C), :004F57B5(C)
|:004F57D0(C), :004F57DD(C)
|
:004F57F4 5E pop esi
:004F57F5 32C0 xor al, al
:004F57F7 5B pop ebx
:004F57F8 C3 ret
|