【破文标题】菜鸟破解之三“****播放系统的注册算法分析”
【破文作者】紫色缘[TFW][PCG]
【作者邮箱】Cn_Fish@126.com
【作者主页】www.cniso.org
【破解工具】OD/peid
【破解平台】Win9x/NT/2000/XP
【软件名称】****播放系统
【软件大小】2MB
【原版下载】不提供~
【保护方式】无
【软件简介】功能不错的一个播放系统
------------------------------------------------------------------------
【破解过程】
第一先启动主程序，在输入假码后出现错误提示框。
再使用Peid查壳后，发现是Borland Delphi 6.0 - 7.0语言编写，于是用OD载入查找到字符：
超级字串参考＋ , 条目 835
地址=00500E39
反汇编=push 00500FAC
文本字串=错误 86599
双击后来到500E39代码处，想分析一下注册的算法过程，即向上找到事件触发点~~
--------------------代码如下-----------------------
00500C62 . 55 push ebp ; 在此下断，F8继续
00500C63 . 68 B10E5000 push 00500EB1
00500C68 . 64:FF30 push dword ptr fs:[eax]
00500C6B . 64:8920 mov fs:[eax], esp
00500C6E . A1 34A35100 mov eax, [51A334] ; [51A334]送入EAX
00500C73 . C700 8B140000 mov dword ptr [eax], 148B ; 148B送入[EAX]
00500C79 . C740 04 0000000>mov dword ptr [eax+4], 0
00500C80 . A1 5CA05100 mov eax, [51A05C] ; [51A05C]送入EAX
00500C85 . 8B00 mov eax, [eax] ; [EAX]送入EAX
00500C87 . 8B80 A4030000 mov eax, [eax+3A4]
00500C8D . 66:BE EBFF mov si, 0FFEB ; SI=FFEB
00500C91 . E8 8633F0FF call 0040401C ; 关键call,跟进
00500C96 . 8D55 F8 lea edx, [ebp-8]
00500C99 . 8B45 FC mov eax, [ebp-4]
00500C9C . 8B80 00030000 mov eax, [eax+300]
00500CA2 . E8 3159F5FF call 004565D8 ; 读取假码位数
00500CA7 . 8B45 F8 mov eax, [ebp-8] ; 假码位数送入EAX
00500CAA . BA 140F5000 mov edx, 00500F14 ; 999999999999
00500CAF . E8 5843F0FF call 0040500C ; EAX与EDX做比较
00500CB4 . 0F83 B6010000 jnb 00500E70 ; 大于则跳
00500CBA . 8D55 F4 lea edx, [ebp-C]
00500CBD . 8B45 FC mov eax, [ebp-4]
00500CC0 . 8B80 00030000 mov eax, [eax+300]
00500CC6 . E8 0D59F5FF call 004565D8 ; 读取假码位数
00500CCB . 8B45 F4 mov eax, [ebp-C] ; 假码位数送入EAX
00500CCE . BA 2C0F5000 mov edx, 00500F2C ; 0000000000
00500CD3 . E8 3443F0FF call 0040500C ; EAX与EDX做比较
00500CD8 . 0F86 92010000 jbe 00500E70 ; 小于或等于则跳转到注册码不正确
00500CDE . 8D55 F0 lea edx, [ebp-10]
00500CE1 . 8B45 FC mov eax, [ebp-4]
00500CE4 . 8B80 00030000 mov eax, [eax+300]
00500CEA . E8 E958F5FF call 004565D8
00500CEF . 8B45 F0 mov eax, [ebp-10] ; 假码位数送入EAX
00500CF2 . 50 push eax ; EAX入栈
00500CF3 . A1 34A35100 mov eax, [51A334] ; [51A334]送入EAX
00500CF8 . FF70 04 push dword ptr [eax+4] ; /Arg2
00500CFB . FF30 push dword ptr [eax] ; |此处出现真码16进制
00500CFD . 8D45 EC lea eax, [ebp-14] ; |
00500D00 . E8 5B8CF0FF call 00409960 ; \转为10进制%d
00500D05 . 8B55 EC mov edx, [ebp-14] ; 真码入EDX
00500D08 . 58 pop eax ; 假码弹出
00500D09 . E8 FE42F0FF call 0040500C ; 经典比较/可做内存注册机
00500D0E . 0F85 23010000 jnz 00500E37 ; 此处爆破nop~~
00500D14 . A1 34A35100 mov eax, [51A334]
00500D19 . FF70 04 push dword ptr [eax+4] ; /Arg2
00500D1C . FF30 push dword ptr [eax] ; |Arg1
00500D1E . 8D45 E8 lea eax, [ebp-18] ; |
00500D21 . E8 3A8CF0FF call 00409960 ; \dsbyxt.00409960
00500D26 . 8B55 E8 mov edx, [ebp-18]
00500D29 . A1 80A15100 mov eax, [51A180]
00500D2E . 83C0 04 add eax, 4
00500D31 . E8 2E3FF0FF call 00404C64
00500D36 . A1 5CA05100 mov eax, [51A05C]
00500D3B . 8B00 mov eax, [eax]
00500D3D . 8B80 90030000 mov eax, [eax+390]
00500D43 . 66:BE EBFF mov si, 0FFEB
00500D47 . E8 D032F0FF call 0040401C
00500D4C . A1 34A35100 mov eax, [51A334]
00500D51 . C700 05000000 mov dword ptr [eax], 5
00500D57 . C740 04 0000000>mov dword ptr [eax+4], 0
00500D5E . 6A 40 push 40 ; /Style = MB_OK|MB_ICONASTERISK|MB_APPLMODAL
00500D60 . 68 380F5000 push 00500F38 ; |系统信息
00500D65 . 68 440F5000 push 00500F44 ; |注册成功!\n\n你将获得本软件终身免费升级权。\n\n感谢你
使用**播放软件!
00500D6A . 6A 00 push 0 ; |hOwner = NULL
00500D6C . E8 3F6FF0FF call <jmp.&user32.MessageBoxA> ; \MessageBoxA
00500D71 . A1 5CA05100 mov eax, [51A05C]
00500D76 . 8B00 mov eax, [eax]
00500D78 . 8B80 5C030000 mov eax, [eax+35C]
00500D7E . 33D2 xor edx, edx
00500D80 . E8 13BBF6FF call 0046C898
00500D85 . B2 01 mov dl, 1
00500D87 . A1 D0854900 mov eax, [4985D0]
00500D8C . E8 9779F9FF call 00498728
00500D91 . A3 30BE5100 mov [51BE30], eax
00500D96 . 8B15 18A35100 mov edx, [51A318] ; dsbyxt.0051C188
00500D9C . 8B12 mov edx, [edx]
00500D9E . A1 30BE5100 mov eax, [51BE30]
00500DA3 . E8 607AF9FF call 00498808
00500DA8 . 8B15 70A35100 mov edx, [51A370] ; dsbyxt.0051C184
00500DAE . 8B12 mov edx, [edx]
00500DB0 . 8D45 E4 lea eax, [ebp-1C]
00500DB3 . B9 940F5000 mov ecx, 00500F94 ; markjl
00500DB8 . E8 5741F0FF call 00404F14
00500DBD . 8B55 E4 mov edx, [ebp-1C]
00500DC0 . 33C9 xor ecx, ecx
00500DC2 . A1 30BE5100 mov eax, [51BE30]
00500DC7 . E8 F07AF9FF call 004988BC
00500DCC . 84C0 test al, al
00500DCE . 74 3D je short 00500E0D
00500DD0 . BA A40F5000 mov edx, 00500FA4 ; gc_id
00500DD5 . A1 30BE5100 mov eax, [51BE30]
00500DDA . E8 C17DF9FF call 00498BA0
00500DDF . 84C0 test al, al
00500DE1 . 74 2A je short 00500E0D
00500DE3 . BA A40F5000 mov edx, 00500FA4 ; gc_id
00500DE8 . A1 30BE5100 mov eax, [51BE30]
00500DED . E8 867CF9FF call 00498A78
00500DF2 . 3D F0000000 cmp eax, 0F0
00500DF7 . 7E 14 jle short 00500E0D
00500DF9 . B9 C8000000 mov ecx, 0C8
00500DFE . BA A40F5000 mov edx, 00500FA4 ; gc_id
00500E03 . A1 30BE5100 mov eax, [51BE30]
00500E08 . E8 437CF9FF call 00498A50
00500E0D > A1 30BE5100 mov eax, [51BE30]
00500E12 . E8 0930F0FF call 00403E20
00500E17 . A1 5CA05100 mov eax, [51A05C]
00500E1C . 8B00 mov eax, [eax]
00500E1E . 8B80 04030000 mov eax, [eax+304]
00500E24 . B2 01 mov dl, 1
00500E26 . E8 456FF4FF call 00447D70
00500E2B . A1 28BE5100 mov eax, [51BE28]
00500E30 . E8 DB9AF7FF call 0047A910
00500E35 . EB 70 jmp short 00500EA7
00500E37 > 6A 10 push 10 ; /Style = MB_OK|MB_ICONHAND|MB_APPLMODAL
00500E39 . 68 AC0F5000 push 00500FAC ; |错误 86599
00500E3E . 68 B80F5000 push 00500FB8 ; |对不起，注册码不正确！
00500E43 . 6A 00 push 0 ; |hOwner = NULL
00500E45 . E8 666EF0FF call <jmp.&user32.MessageBoxA> ; \MessageBoxA
00500E4A . 8B45 FC mov eax, [ebp-4]
00500E4D . 8B80 00030000 mov eax, [eax+300]
00500E53 . 33D2 xor edx, edx
00500E55 . E8 BE57F5FF call 00456618
00500E5A . A1 5CA05100 mov eax, [51A05C]
00500E5F . 8B00 mov eax, [eax]
00500E61 . 8B80 04030000 mov eax, [eax+304]
00500E67 . 33D2 xor edx, edx
00500E69 . E8 026FF4FF call 00447D70
00500E6E . EB 37 jmp short 00500EA7
00500E70 > 6A 10 push 10 ; /Style = MB_OK|MB_ICONHAND|MB_APPLMODAL
00500E72 . 68 D00F5000 push 00500FD0 ; |错误 efgkc
00500E77 . 68 B80F5000 push 00500FB8 ; |对不起，注册码不正确！
00500E7C . 6A 00 push 0 ; |hOwner = NULL
00500E7E . E8 2D6EF0FF call <jmp.&user32.MessageBoxA> ; \MessageBoxA
00500E83 . 8B45 FC mov eax, [ebp-4]
00500E86 . 8B80 00030000 mov eax, [eax+300]
00500E8C . 33D2 xor edx, edx
00500E8E . E8 8557F5FF call 00456618
00500E93 . A1 5CA05100 mov eax, [51A05C]
00500E98 . 8B00 mov eax, [eax]
00500E9A . 8B80 04030000 mov eax, [eax+304]
00500EA0 . 33D2 xor edx, edx
00500EA2 . E8 C96EF4FF call 00447D70
00500EA7 > 33C0 xor eax, eax
00500EA9 . 5A pop edx
00500EAA . 59 pop ecx
00500EAB . 59 pop ecx
00500EAC . 64:8910 mov fs:[eax], edx
00500EAF . EB 14 jmp short 00500EC5
00500EB1 .^ E9 4A34F0FF jmp 00404300
00500EB6 . A1 28BE5100 mov eax, [51BE28]
00500EBB . E8 509AF7FF call 0047A910
00500EC0 . E8 A337F0FF call 00404668
00500EC5 > 8B45 FC mov eax, [ebp-4]
00500EC8 . 8B80 08030000 mov eax, [eax+308]
00500ECE . 33D2 xor edx, edx
00500ED0 . E8 4F55F5FF call 00456424
00500ED5 . 33C0 xor eax, eax
00500ED7 . 5A pop edx
00500ED8 . 59 pop ecx
00500ED9 . 59 pop ecx
00500EDA . 64:8910 mov fs:[eax], edx
00500EDD . 68 040F5000 push 00500F04
00500EE2 > 8D45 E4 lea eax, [ebp-1C]
00500EE5 . BA 03000000 mov edx, 3
00500EEA . E8 453DF0FF call 00404C34
00500EEF . 8D45 F0 lea eax, [ebp-10]
00500EF2 . BA 03000000 mov edx, 3
00500EF7 . E8 383DF0FF call 00404C34
00500EFC . C3 retn
00500EFD .^ E9 B236F0FF jmp 004045B4
00500F02 .^ EB DE jmp short 00500EE2
00500F04 . 5F pop edi
00500F05 . 5E pop esi
00500F06 . 5B pop ebx
00500F07 . 8BE5 mov esp, ebp
00500F09 . 5D pop ebp
00500F0A . C3 retn
------------------------跟进500C91处的代码如下----------------------------------------
0040401C $ 50 push eax
0040401D . 51 push ecx
0040401E . 8B00 mov eax, [eax]
00404020 . E8 C7FFFFFF call 00403FEC ; 这里跟进
00404025 . 59 pop ecx
00404026 . 58 pop eax
00404027 . 74 02 je short 0040402B
00404029 . FFE6 jmp esi
0040402B > 59 pop ecx
0040402C .^ E9 AFECFFFF jmp 00402CE0
00404031 . C3 retn
------------------------跟进404020处的代码如下-----------------------------------------
其中这里有2个call，虽然说地址跟进是一样，但是有2段代码....小弟不明白,请各位大侠指点一二~
00403FEC /$ 57 push edi
00403FED |. 96 xchg eax, esi
00403FEE |. EB 02 jmp short 00403FF2
00403FF0 |> 8B36 /mov esi, [esi]
00403FF2 |> 8B7E D0 mov edi, [esi-30]
00403FF5 |. 85FF |test edi, edi
00403FF7 |. 74 0D |je short 00404006
00403FF9 |. 0FB70F |movzx ecx, word ptr [edi]
00403FFC |. 51 |push ecx
00403FFD |. 83C7 02 |add edi, 2
00404000 |. F2:66:AF |repne scas word ptr es:[edi]
00404003 |. 74 0A |je short 0040400F
00404005 |. 59 |pop ecx
00404006 |> 8B76 DC |mov esi, [esi-24]
00404009 |. 85F6 |test esi, esi
0040400B |.^ 75 E3 \jnz short 00403FF0
0040400D |. 5F pop edi
0040400E |. C3 retn
0040400F |> 58 pop eax
00404010 |. 01C0 add eax, eax
00404012 |. 29C8 sub eax, ecx
00404014 |. 8B7447 FC mov esi, [edi+eax*2-4]
00404018 |. 5F pop edi
00404019 \. C3 retn
0040401A 8BC0 mov eax, eax
0040401C $ 50 push eax
0040401D . 51 push ecx
0040401E . 8B00 mov eax, [eax]
00404020 . E8 C7FFFFFF call 00403FEC
00404025 . 59 pop ecx
00404026 . 58 pop eax
00404027 . 74 02 je short 0040402B
00404029 . /FFE6 jmp esi ; *****.0044055C （注意这里直接跳转）
0040402B > 59 pop ecx
0040402C .^ E9 AFECFFFF jmp 00402CE0
00404031 . C3 retn
中间省略N行代码~~~
0044055C /$ 55 push ebp
0044055D |. 8BEC mov ebp, esp
0044055F |. 83C4 F8 add esp, -8
00440562 |. 8945 FC mov [ebp-4], eax
00440565 |. 8B45 FC mov eax, [ebp-4]
00440568 |. E8 DB340300 call 00473A48
0044056D |. 8945 F8 mov [ebp-8], eax
00440570 |. 837D F8 00 cmp dword ptr [ebp-8], 0
00440574 |. 74 12 je short 00440588
00440576 |. 8B45 FC mov eax, [ebp-4]
00440579 |. 8B80 14020000 mov eax, [eax+214]
0044057F |. 8B55 F8 mov edx, [ebp-8]
00440582 |. 8982 4C020000 mov [edx+24C], eax
00440588 |> 8B45 FC mov eax, [ebp-4]
0044058B |. E8 707D0100 call 00458300 ; 算法
00440590 |. 59 pop ecx
00440591 |. 59 pop ecx
00440592 |. 5D pop ebp
00440593 \. C3 retn
------------------------跟进44058B处的代码如下-----------------------------------------
中间省略N行代码~~~
00458363 |. 8B40 6C mov eax, [eax+6C]
00458366 |. 8B08 mov ecx, [eax]
00458368 |. FF51 18 call [ecx+18]
0045836B |. EB 1F jmp short 0045838C
0045836D |> 8B45 FC mov eax, [ebp-4]
00458370 |. 66:83B8 2201000>cmp word ptr [eax+122], 0
00458378 |. 74 12 je short 0045838C
0045837A |. 8B5D FC mov ebx, [ebp-4]
0045837D |. 8B55 FC mov edx, [ebp-4]
00458380 |. 8B83 24010000 mov eax, [ebx+124]
00458386 |. FF93 20010000 call [ebx+120] ; 算法call
0045838C |> 5B pop ebx
0045838D |. 59 pop ecx
0045838E |. 5D pop ebp
0045838F \. C3 retn
------------------------跟进458386处的代码如下（算法call）-----------------------------------------
00511884 /. 55 push ebp ; 跟到此,F8继续
00511885 |. 8BEC mov ebp, esp
00511887 |. 6A 00 push 0
00511889 |. 6A 00 push 0
0051188B |. 6A 00 push 0
0051188D |. 53 push ebx
0051188E |. 56 push esi
0051188F |. 57 push edi
00511890 |. 33C0 xor eax, eax
00511892 |. 55 push ebp
00511893 |. 68 DD1A5100 push 00511ADD
00511898 |. 64:FF30 push dword ptr fs:[eax]
0051189B |. 64:8920 mov fs:[eax], esp
0051189E |. 8D45 FC lea eax, [ebp-4]
005118A1 |. 8B15 C0BF5100 mov edx, [51BFC0]
005118A7 |. E8 FC33EFFF call 00404CA8
005118AC |. 8D45 F8 lea eax, [ebp-8]
005118AF |. E8 5C33EFFF call 00404C10
005118B4 |. 8B45 FC mov eax, [ebp-4] ;出硬盘序列号送入EAX
005118B7 |. E8 0C36EFFF call 00404EC8
005118BC |. 8BF0 mov esi, eax ; EAX -->ESI
005118BE |. 85F6 test esi, esi ; 测试ESI是否小于E
005118C0 |. 0F8E 8D010000 jle 00511A53 ; 小于则跳转
005118C6 |. BB 01000000 mov ebx, 1
005118CB |> 8D45 F4 /lea eax, [ebp-C]
005118CE |. 50 |push eax
005118CF |. B9 01000000 |mov ecx, 1
005118D4 |. 8BD3 |mov edx, ebx
005118D6 |. 8B45 FC |mov eax, [ebp-4] ; 硬盘序列号送入EAX
005118D9 |. E8 4238EFFF |call 00405120
005118DE |. 8B45 F4 |mov eax, [ebp-C]
005118E1 |. BA F41A5100 |mov edx, 00511AF4 ; 9
005118E6 |. E8 2137EFFF |call 0040500C
005118EB |. 0F87 B2000000 |ja 005119A3
005118F1 |. 8D45 F8 |lea eax, [ebp-8]
005118F4 |. 50 |push eax
005118F5 |. B9 01000000 |mov ecx, 1
005118FA |. 8BD3 |mov edx, ebx
005118FC |. 8B45 FC |mov eax, [ebp-4]
005118FF |. E8 1C38EFFF |call 00405120
00511904 |. 8B45 F8 |mov eax, [ebp-8]
00511907 |. E8 8C80EFFF |call 00409998
0051190C |. 8BF8 |mov edi, eax
0051190E |. 8BC7 |mov eax, edi
00511910 |. F7EB |imul ebx
00511912 |. 71 05 |jno short 00511919
00511914 |. E8 4724EFFF |call 00403D60
00511919 |> 83C0 03 |add eax, 3 ; EAX=EAX+3
0051191C |. 71 05 |jno short 00511923
0051191E |. E8 3D24EFFF |call 00403D60
00511923 |> 99 |cdq ; 双字扩展
00511924 |. 33C2 |xor eax, edx
00511926 |. 2BC2 |sub eax, edx ; EAX=EAX-EDX
00511928 |. 71 05 |jno short 0051192F
0051192A |. E8 3124EFFF |call 00403D60
0051192F |> 8BF8 |mov edi, eax ; EAX送入EDI
00511931 |. 833D DCBF5100 0>|cmp dword ptr [51BFDC], 0 ; 比较是否取完
00511938 |. 75 0E |jnz short 00511948
0051193A |. 813D D8BF5100 F>|cmp dword ptr [51BFD8], 5F5E0FF
00511944 |. 76 2F |jbe short 00511975
00511946 |. EB 02 |jmp short 0051194A
00511948 |> 7E 2B |jle short 00511975
0051194A |> 6A 00 |push 0
0051194C |. 68 80969800 |push 989680
00511951 |. 8B05 D8BF5100 |mov eax, [51BFD8]
00511957 |. 8B15 DCBF5100 |mov edx, [51BFDC]
0051195D |. E8 5E44EFFF |call 00405DC0
00511962 |. 71 05 |jno short 00511969
00511964 |. E8 F723EFFF |call 00403D60
00511969 |> 8905 D8BF5100 |mov [51BFD8], eax
0051196F |. 8915 DCBF5100 |mov [51BFDC], edx
00511975 |> 8BC7 |mov eax, edi
00511977 |. 99 |cdq
00511978 |. 52 |push edx
00511979 |. 50 |push eax
0051197A |. 8B05 D8BF5100 |mov eax, [51BFD8]
00511980 |. 8B15 DCBF5100 |mov edx, [51BFDC]
00511986 |. E8 CD42EFFF |call 00405C58
0051198B |. 71 05 |jno short 00511992
0051198D |. E8 CE23EFFF |call 00403D60
00511992 |> 8905 D8BF5100 |mov [51BFD8], eax ; EAX送入[51BFD8]
00511998 |. 8915 DCBF5100 |mov [51BFDC], edx
0051199E |. E9 A8000000 |jmp 00511A4B
005119A3 |> 833D DCBF5100 0>|cmp dword ptr [51BFDC], 0
005119AA |. 75 0E |jnz short 005119BA
005119AC |. 813D D8BF5100 7>|cmp dword ptr [51BFD8], 98967F
005119B6 |. 76 2F |jbe short 005119E7
005119B8 |. EB 02 |jmp short 005119BC
005119BA |> 7E 2B |jle short 005119E7
005119BC |> 6A 00 |push 0
005119BE |. 68 40420F00 |push 0F4240
005119C3 |. 8B05 D8BF5100 |mov eax, [51BFD8]
005119C9 |. 8B15 DCBF5100 |mov edx, [51BFDC]
005119CF |. E8 EC43EFFF |call 00405DC0
005119D4 |. 71 05 |jno short 005119DB
005119D6 |. E8 8523EFFF |call 00403D60
005119DB |> 8905 D8BF5100 |mov [51BFD8], eax
005119E1 |. 8915 DCBF5100 |mov [51BFDC], edx
005119E7 |> 8B45 FC |mov eax, [ebp-4] ; 硬盘序列号送入EAX
005119EA |. 4B |dec ebx ; 减1
005119EB |. 85C0 |test eax, eax
005119ED |. 74 05 |je short 005119F4
005119EF |. 3B58 FC |cmp ebx, [eax-4]
005119F2 |. 72 05 |jb short 005119F9
005119F4 E8 5F23EFFF call 00403D58
005119F9 |> 43 |inc ebx ; +1
005119FA |. 8A4418 FF |mov al, [eax+ebx-1] ; 开始取硬盘序列号的每一位ASCII值
005119FE |. 25 FF000000 |and eax, 0FF ; 取的值与0FF做and运算
00511A03 |. 33D2 |xor edx, edx ; EDX清0
00511A05 |. 52 |push edx ; EDX入栈
00511A06 |. 50 |push eax ; EAX入栈
00511A07 |. 8B05 D8BF5100 |mov eax, [51BFD8] ; [51BFD8]送入EAX
00511A0D |. 8B15 DCBF5100 |mov edx, [51BFDC] ; [51BFDC]送入EDX
00511A13 |. E8 4042EFFF |call 00405C58
00511A18 |. 71 05 |jno short 00511A1F
00511A1A |. E8 4123EFFF |call 00403D60
00511A1F |> 83C0 07 |add eax, 7 ; EAX=EAX+7
00511A22 |. 83D2 00 |adc edx, 0 ; EDX=EDX+0=0
00511A25 |. 71 05 |jno short 00511A2C
00511A27 |. E8 3423EFFF |call 00403D60
00511A2C |> 85D2 |test edx, edx
00511A2E |. 7D 0F |jge short 00511A3F
00511A30 |. 33C9 |xor ecx, ecx
00511A32 |. F7D8 |neg eax
00511A34 |. 87CA |xchg edx, ecx
00511A36 |. 1BD1 |sbb edx, ecx
00511A38 |. 71 05 |jno short 00511A3F
00511A3A |. E8 2123EFFF |call 00403D60
00511A3F |> 8905 D8BF5100 |mov [51BFD8], eax ; EAX送入[51BFD8]
00511A45 |. 8915 DCBF5100 |mov [51BFDC], edx ; EDX送入[51BFDC]
00511A4B |> 43 |inc ebx ; ebx(计数器)加1
00511A4C |. 4E |dec esi ; 减1
00511A4D |.^ 0F85 78FEFFFF \jnz 005118CB ; 循环取
00511A53 |> 8B05 D8BF5100 mov eax, [51BFD8]
00511A59 |. 8B15 DCBF5100 mov edx, [51BFDC]
00511A5F |. 85D2 test edx, edx
00511A61 |. 7D 0F jge short 00511A72
00511A63 |. 33C9 xor ecx, ecx
00511A65 |. F7D8 neg eax
00511A67 |. 87CA xchg edx, ecx
00511A69 |. 1BD1 sbb edx, ecx
00511A6B |. 71 05 jno short 00511A72
00511A6D |. E8 EE22EFFF call 00403D60
00511A72 |> 8905 D8BF5100 mov [51BFD8], eax ; EAX(一系列运算完毕的16进制)送入[51BFD8]
00511A78 |. 8915 DCBF5100 mov [51BFDC], edx
00511A7E |. 833D DCBF5100 0>cmp dword ptr [51BFDC], 0
00511A85 |. 75 0E jnz short 00511A95
00511A87 |. 813D D8BF5100 F>cmp dword ptr [51BFD8], 3B9AC9FF ; 真码16进制与"3B9AC9FF"作对比
00511A91 |. 76 2F jbe short 00511AC2 ; 小于就跳
00511A93 |. EB 02 jmp short 00511A97
00511A95 |> 7E 2B jle short 00511AC2
00511A97 |> 6A 00 push 0
00511A99 |. 68 00CA9A3B push 3B9ACA00
00511A9E |. 8B05 D8BF5100 mov eax, [51BFD8]
00511AA4 |. 8B15 DCBF5100 mov edx, [51BFDC]
00511AAA |. E8 1143EFFF call 00405DC0
00511AAF |. 71 05 jno short 00511AB6
00511AB1 |. E8 AA22EFFF call 00403D60
00511AB6 |> 8905 D8BF5100 mov [51BFD8], eax
00511ABC |. 8915 DCBF5100 mov [51BFDC], edx
00511AC2 |> 33C0 xor eax, eax
00511AC4 |. 5A pop edx
00511AC5 |. 59 pop ecx
00511AC6 |. 59 pop ecx
00511AC7 |. 64:8910 mov fs:[eax], edx
00511ACA |. 68 E41A5100 push 00511AE4
00511ACF |> 8D45 F4 lea eax, [ebp-C]
00511AD2 |. BA 03000000 mov edx, 3
00511AD7 |. E8 5831EFFF call 00404C34
00511ADC \. C3 retn ; 返回
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【算法总结】
1、硬盘序列号必须为14位 ，可记为A
2、取A的每一位ASCII值与0FF做and 运算再加上7，最后全部累加为16进制，可记为B
3、然后把B转换为10进制，即是注册码
后记：
1.其实在破解的时候：触发事件一断下来就给了我们真码的16进制.
（当时没太在意，可一直找不出关键call，然后就一层层call跟进，最后找到正确的算法核心）
2.以下出现一系列的ascii"999999999999"及ascii"0000000000"都没有与算法搭上边,当时被这些迷惑住了,呵呵~~~
3.感谢你看到此处~~很简单的一个算法~ 其他也没啥好说的了.有不当之处,请各位大侠多多指正~~~
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【版权声明】本文纯属技术交流, 转载请注明作者信息并保持文章的完整, 谢谢!
[招生]科锐逆向工程师培训(2024年11月15日实地，远程教学同时开班, 第51期)
