系统 ： Windows xp
程序 ： k4n6
程序下载地址 ：https://pan.baidu.com/s/1pLANxyj
要求 ： 注册机编写
使用工具 ： OD & DeDe
可在看雪论坛中查找关于此程序的破文，传送门
首先在DeDe找到激发按钮点击事件的 代码：
0044435C 55 push ebp
0044435D 8BEC mov ebp, esp
0044435F 33C9 xor ecx, ecx
00444361 51 push ecx
00444362 51 push ecx
00444363 51 push ecx
00444364 51 push ecx
00444365 51 push ecx
00444366 51 push ecx
00444367 51 push ecx
00444368 51 push ecx
00444369 53 push ebx
0044436A 56 push esi
0044436B 57 push edi
0044436C 8BD8 mov ebx, eax
0044436E 33C0 xor eax, eax
00444370 55 push ebp
* Possible String Reference to: '閒铥朕_^[嬪]?
|
00444371 680D454400 push $0044450D
***** TRY
|
00444376 64FF30 push dword ptr fs:[eax]
00444379 648920 mov fs:[eax], esp
0044437C 8D55E4 lea edx, [ebp-$1C]
* Reference to control Edit3 : TEdit
|
0044437F 8B83D8020000 mov eax, [ebx+$02D8]
* Reference to: controls.TControl.GetText(TControl):TCaption;
|
00444385 E892F9FDFF call 00423D1C
0044438A 8B45E4 mov eax, [ebp-$1C]
* Reference to: system.@LStrLen:Integer;
| or: system.@DynArrayLength;
| or: system.DynArraySize(Pointer):Integer;
|
0044438D E8CEF7FBFF call 00403B60
00444392 48 dec eax
00444393 0F8C4C010000 jl 004444E5
00444399 8D55E8 lea edx, [ebp-$18]
* Reference to control Edit3 : TEdit
|
0044439C 8B83D8020000 mov eax, [ebx+$02D8]
....略
看到提供的很多Call dede都提供了参考，再用od载入程序查看该段代码：
0044435C . 55 push ebp ; Button1Click
0044435D . 8BEC mov ebp, esp
0044435F . 33C9 xor ecx, ecx
00444361 . 51 push ecx
00444362 . 51 push ecx
00444363 . 51 push ecx
00444364 . 51 push ecx
00444365 . 51 push ecx
00444366 . 51 push ecx
00444367 . 51 push ecx
00444368 . 51 push ecx
00444369 . 53 push ebx
0044436A . 56 push esi
0044436B . 57 push edi
0044436C . 8BD8 mov ebx, eax
0044436E . 33C0 xor eax, eax
00444370 . 55 push ebp
00444371 . 68 0D454400 push 0044450D
00444376 . 64:FF30 push dword ptr fs:[eax]
00444379 . 64:8920 mov dword ptr fs:[eax], esp
0044437C . 8D55 E4 lea edx, dword ptr [ebp-1C]
0044437F . 8B83 D8020000 mov eax, dword ptr [ebx+2D8]
00444385 . E8 92F9FDFF call 00423D1C
0044438A . 8B45 E4 mov eax, dword ptr [ebp-1C] ; 获取密钥
0044438D . E8 CEF7FBFF call 00403B60 ; 取长度
00444392 . 48 dec eax
00444393 . 0F8C 4C010000 jl 004444E5 ; 字符串为空则跳出判断
00444399 . 8D55 E8 lea edx, dword ptr [ebp-18]
0044439C . 8B83 D8020000 mov eax, dword ptr [ebx+2D8]
004443A2 . E8 75F9FDFF call 00423D1C
004443A7 . 8D55 F0 lea edx, dword ptr [ebp-10]
004443AA . 8B83 D0020000 mov eax, dword ptr [ebx+2D0]
004443B0 . E8 67F9FDFF call 00423D1C
004443B5 . 8D55 EC lea edx, dword ptr [ebp-14]
004443B8 . 8B83 D4020000 mov eax, dword ptr [ebx+2D4]
004443BE . E8 59F9FDFF call 00423D1C
004443C3 . 8B45 F0 mov eax, dword ptr [ebp-10] ; 获取用户名
004443C6 . E8 95F7FBFF call 00403B60 ; 取长度
004443CB . 83F8 04 cmp eax, 4 ; 小于4则跳出判断
004443CE . 0F8C 11010000 jl 004444E5
004443D4 . 8B45 EC mov eax, dword ptr [ebp-14] ; 获取公司名
004443D7 . E8 84F7FBFF call 00403B60 ; 取长度
004443DC . 83F8 03 cmp eax, 3 ; 小于3则跳出判断
004443DF . 0F8C 00010000 jl 004444E5
004443E5 . 8B45 F0 mov eax, dword ptr [ebp-10] ; 取用户名
004443E8 . 0FB600 movzx eax, byte ptr [eax] ; 取第一个字符
004443EB . 0FB680 DF5944>movzx eax, byte ptr [eax+4459DF] ; 按照字符的值取出 表里的值，这里用插件取出表
004443F2 . 8945 F4 mov dword ptr [ebp-C], eax
004443F5 . 8B45 F0 mov eax, dword ptr [ebp-10]
004443F8 . 0FB640 02 movzx eax, byte ptr [eax+2] ; 取第三个字符
004443FC . 0FB6B0 DF5944>movzx esi, byte ptr [eax+4459DF] ; 按照字符的值取出 表里的值
00444403 . 8B45 EC mov eax, dword ptr [ebp-14] ; 再取公司名
00444406 . E8 55F7FBFF call 00403B60 ; 获取公司名长度
0044440B . 8B55 EC mov edx, dword ptr [ebp-14] ; 保存公司名
0044440E . 0FB64402 FE movzx eax, byte ptr [edx+eax-2] ; 取倒数第二个字符
00444413 . 0FB6B8 DF5944>movzx edi, byte ptr [eax+4459DF] ; 按照字符的值取出 表里的值
0044441A . 8B45 EC mov eax, dword ptr [ebp-14]
0044441D . E8 3EF7FBFF call 00403B60
00444422 . 8B55 EC mov edx, dword ptr [ebp-14]
00444425 . 0FB64402 FF movzx eax, byte ptr [edx+eax-1] ; 取倒数第一个字符
0044442A . 0FB680 DF5944>movzx eax, byte ptr [eax+4459DF] ; 按照字符的值取出 表里的值
00444431 . 8B55 F0 mov edx, dword ptr [ebp-10]
00444434 . 0FB652 03 movzx edx, byte ptr [edx+3] ; 取用户名第四个字符
00444438 . 0FB692 DF5944>movzx edx, byte ptr [edx+4459DF] ; 按照字符的值取出 表里的值
0044443F . 8B4D EC mov ecx, dword ptr [ebp-14]
00444442 . 0FB649 02 movzx ecx, byte ptr [ecx+2] ; 取公司名第三个字符
00444446 . 0FB689 DF5944>movzx ecx, byte ptr [ecx+4459DF] ; 按照字符的值取出 表里的值
0044444D . 0FAFD1 imul edx, ecx
00444450 . 8955 F8 mov dword ptr [ebp-8], edx ; 保存相乘结果
00444453 . 8B55 F4 mov edx, dword ptr [ebp-C] ; 用户名第一个字符在表中对应的值
00444456 . 0FAFD6 imul edx, esi
00444459 . 0FAFD7 imul edx, edi
0044445C . 0FAFD0 imul edx, eax
0044445F . 0355 F8 add edx, dword ptr [ebp-8]
00444462 . 8955 FC mov dword ptr [ebp-4], edx
00444465 . 8B45 FC mov eax, dword ptr [ebp-4]
00444468 . 35 D8280000 xor eax, 28D8
0044446D . 05 7D4A8D28 add eax, 288D4A7D
00444472 . 8945 FC mov dword ptr [ebp-4], eax ; 结果保存
00444475 . 8B45 FC mov eax, dword ptr [ebp-4]
00444478 . B9 39300000 mov ecx, 3039
0044447D . C1C1 06 rol ecx, 6 ; 循环左移
00444480 . 35 14970000 xor eax, 9714
00444485 . C1C8 02 ror eax, 2
00444488 . C1F8 03 sar eax, 3 ; 算数右移
0044448B . 01C8 add eax, ecx
0044448D . 0345 F8 add eax, dword ptr [ebp-8]
00444490 . 40 inc eax
00444491 . 66:F7D0 not ax
00444494 . 09C1 or ecx, eax
00444496 . 05 9A020000 add eax, 29A
0044449B . 8945 FC mov dword ptr [ebp-4], eax ; 结果保存
0044449E . 33C0 xor eax, eax
004444A0 . 55 push ebp
004444A1 . 68 DB444400 push 004444DB
004444A6 . 64:FF30 push dword ptr fs:[eax]
004444A9 . 64:8920 mov dword ptr fs:[eax], esp
004444AC . 8D55 E0 lea edx, dword ptr [ebp-20]
004444AF . 8B83 D8020000 mov eax, dword ptr [ebx+2D8]
004444B5 . E8 62F8FDFF call 00423D1C ; 获取密钥
004444BA . 8B45 E0 mov eax, dword ptr [ebp-20]
004444BD . E8 4E36FCFF call 00407B10 ; StrToInt
004444C2 . 3B45 FC cmp eax, dword ptr [ebp-4] ; 和结果是否相同？
004444C5 . 75 0A jnz short 004444D1
004444C7 . B8 24454400 mov eax, 00444524 ; good , this number come from your keygen ?
004444CC . E8 A3FAFFFF call 00443F74 ; ShowMessage
004444D1 > 33C0 xor eax, eax
004444D3 . 5A pop edx
004444D4 . 59 pop ecx
004444D5 . 59 pop ecx
代码分析完毕，虽然变量操作很多很复杂，但耐下心来做的话还是觉得比较简单的。
打开http://www.cnblogs.com/ZRBYYXDM/p/5115596.html中搭建的框架，向着界面上多加一个编辑框和标签用来输入公司名。
ID: IDC_EDIT_COMPANY | TYPE:BUTTON
ID: IDC_STATIC | TYPE:Label | Caption:公司名
修改OnBtnDecrypt函数如下：
void CKengen_TemplateDlg::OnBtnDecrypt()
{
// TODO: Add your control notification handler code here
CString name;
GetDlgItemText( IDC_EDIT_NAME,name ); //获取用户名字串基本信息。
CString company;
GetDlgItemText( IDC_EDIT_COMPANY,company ); //获取用户名字串基本信息。
if ( name.GetLength() >= 4 && company.GetLength() >= 3 ){ //格式控制。
int table[] = {
0x00, 0x10, 0x39, 0x44, 0x00, 0x24, 0x39, 0x44, 0x00, 0x0C,
0xAF, 0x40, 0x00, 0x14, 0xAF, 0x40, 0x00, 0x1C, 0xAF, 0x40,
0x00, 0x24, 0xAF, 0x40, 0x00, 0x34, 0xAF, 0x40, 0x00, 0x3C,
0xAF, 0x40, 0x00, 0x44, 0xAF, 0x40, 0x00, 0x4C, 0xAF, 0x40,
0x00, 0x54, 0xAF, 0x40, 0x00, 0x5C, 0xAF, 0x40, 0x00, 0x2C,
0xAF, 0x40, 0x00, 0x06, 0x00, 0x00, 0x00, 0x07, 0x00, 0x00,
0x00, 0x01, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x03,
0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00,
0x00, 0x08, 0x00, 0x00, 0x00, 0x09, 0x00, 0x00, 0x00, 0x0A,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x2C, 0x61, 0x23,
0x47, 0x0E, 0x26, 0x61, 0x20, 0x31, 0x49, 0x36, 0x24, 0x2B,
0x42, 0x31, 0x63, 0x0E, 0x29, 0x5E, 0x30, 0x4B, 0x38, 0x2A,
0x33, 0x44, 0x3D
};
unsigned int ch = table[name[0]];
unsigned int ch2 = table[name[2]];
unsigned int ch3 = table[ company[company.GetLength() - 2] ];
unsigned int ch4 = table[ company[company.GetLength() - 1] ];
unsigned int ch5 = table[ name[3] ];
unsigned int ch6 = table[ company[2] ];
unsigned int res = ch5 * ch6;
unsigned int res2 = ch * ch2 * ch3 * ch4 + res;
unsigned int res3;
//左移异或这些操作直接拷贝源汇编代码改改
__asm{
push eax
push ecx
mov eax, res2
xor eax, 0x28D8
add eax, 0x288D4A7D
mov ecx, 0x3039
rol ecx, 6
xor eax, 0x9714
ror eax, 2
sar eax, 3
add eax, ecx
add eax, res
inc eax
not ax
or ecx, eax
add eax, 0x29A
mov res3, eax
pop ecx
pop eax
}
CString PassWord;
PassWord.Format( "%lu",res3 );
SetDlgItemText( IDC_EDIT_PASSWORD2,PassWord );
}
else
MessageBox( "用户名格式错误！" );
}
再将OnBtnCopy函数改成：
void CKengen_TemplateDlg::OnBtnCopy()
{
// TODO: Add your control notification handler code here
CString cmd;
GetDlgItemText( IDC_BTN_COPY,cmd );
if ( OpenClipboard() ){ //打开剪贴板
CString str;
HANDLE hClip;
char *pBuf;
EmptyClipboard();
if ( cmd == "拷贝用户名" ) //如果命令是拷贝用户名
GetDlgItemText( IDC_EDIT_NAME,str );
else{
if ( cmd == "拷贝公司名" )
GetDlgItemText( IDC_EDIT_COMPANY,str );
else
GetDlgItemText( IDC_EDIT_PASSWORD2,str );
}
hClip = GlobalAlloc( GMEM_MOVEABLE,str.GetLength() + 1 );
pBuf = (char*)GlobalLock( hClip );
strcpy( pBuf,str );
GlobalUnlock( hClip );
SetClipboardData( CF_TEXT,hClip );
CloseClipboard();
if ( cmd == "拷贝用户名" ){ //变换命令
SetDlgItemText( IDC_BTN_COPY,"拷贝公司名" );
SetDlgItemText( IDC_STC_MSG,"拷贝用户名成功！" ); //提示成功
}
else{
if ( cmd == "拷贝公司名" ){
SetDlgItemText( IDC_BTN_COPY,"拷贝序列号" );
SetDlgItemText( IDC_STC_MSG,"拷贝公司名成功！" );
}
else{
SetDlgItemText( IDC_BTN_COPY,"拷贝用户名" );
SetDlgItemText( IDC_STC_MSG,"拷贝序列号成功！" );
}
}
}
else
SetDlgItemText( IDC_STC_MSG,"拷贝失败！" );
}
再在OnInitDialog中添加此代码修改标题：SetWindowText(_T("Keygen"));
运行效果：
