国图图书下载系统9.0的破解过程及注册码算法,谁能帮我写个注册机来?:)
国图图书下载系统9.0的破解过程及注册码算法
作者:Crack007
主页:http://www.crack007.com ( ^-^ )
破解日期:2001-11-26
破解工具:TRW2000 1.22 Fi2.49 Wasm 8.93黄金版
难度:较易
软件下载地址:http://www.widenstage.com/artech/product/nlcdownload/nlcdownload.exe(1633KB)
软件简介: 国家图书馆是继超星图书馆以来的又一家大型电子数字图书馆,现有图书10余万册,并且不断增加。本软件就是专门为下载国家图书馆的电子图书而设计。共享版只能下载不足150页的图书,或者图书的前150页。
您注册以后,将没有此限制。
主程序用NeoLite v2.0加壳,简单脱壳后反汇编得到如下信息:
:0040F484 E827370C00 call 004D2BB0
:0040F489 8BC3
mov eax, ebx
:0040F48B E864090000 call 0040FDF4
:0040F490 8BC3
mov eax, ebx
:0040F492 E879030000 call 0040F810
//看看下面提示语句就知道很经典的,让我们跟进这个Call
:0040F497 84C0
test al, al
:0040F499 7460
je 0040F4FB //跳则死
:0040F49B 6A00
push 00000000
* Possible StringData Ref from Data Obj ->"感谢您,您已经注册成功!
重新启动系统,注册将会"
->"生效!"
|
:0040F49D BA15E24E00 mov edx,
004EE215
:0040F4A2 66C746102C00 mov [esi+10],
002C
:0040F4A8 8D45E4
lea eax, dword ptr [ebp-1C]
:0040F4AB E864350C00 call 004D2A14
:0040F4B0 FF461C
inc [esi+1C]
:0040F4B3 8B10
mov edx, dword ptr [eax]
:0040F4B5 52
push edx
:0040F4B6 6A02
push 00000002
:0040F4B8 6A00
push 00000000
:0040F4BA 8D4DBA
lea ecx, dword ptr [ebp-46]
:0040F4BD 51
push ecx
:0040F4BE E885940B00 call 004C8948
:0040F4C3 83C40C
add esp, 0000000C
:0040F4C6 8D45BA
lea eax, dword ptr [ebp-46]
:0040F4C9 804DBA04 or
byte ptr [ebp-46], 04
:0040F4CD 668B08
mov cx, word ptr [eax]
:0040F4D0 58
pop eax
:0040F4D1 B202
mov dl, 02
:0040F4D3 E8E8310700 call 004826C0
:0040F4D8 FF4E1C
dec [esi+1C]
:0040F4DB 8D45E4
lea eax, dword ptr [ebp-1C]
:0040F4DE BA02000000 mov edx,
00000002
:0040F4E3 E8C8360C00 call 004D2BB0
:0040F4E8 C7833402000001000000 mov dword ptr [ebx+00000234], 00000001
:0040F4F2 8BC3
mov eax, ebx
:0040F4F4 E83BAB0600 call 0047A034
:0040F4F9 EB58
jmp 0040F553
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040F499(C)
|
:0040F4FB 6A00
push 00000000
* Possible StringData Ref from Data Obj ->"注册码错误!请重新输入!"
|
:0040F4FD BA49E24E00 mov edx,
004EE249
:0040F502 66C746103800 mov [esi+10],
0038
-----------------来自 0040F492 E879030000 call 0040F810----
:0040F810 55
push ebp
:0040F811 8BEC
mov ebp, esp
:0040F813 83C4A8
add esp, FFFFFFA8
:0040F816 53
push ebx
:0040F817 56
push esi
:0040F818 57
push edi
:0040F819 8BD8
mov ebx, eax
:0040F81B 8D75B8
lea esi, dword ptr [ebp-48]
:0040F81E B8B0E64E00 mov eax,
004EE6B0
:0040F823 E83C940B00 call 004C8C64
:0040F828 8BC3
mov eax, ebx
:0040F82A E8BD030000 call 0040FBEC
:0040F82F 66C746100800 mov [esi+10],
0008
:0040F835 33D2
xor edx, edx
:0040F837 33C9
xor ecx, ecx
:0040F839 8955FC
mov dword ptr [ebp-04], edx
:0040F83C 33C0
xor eax, eax
:0040F83E FF461C
inc [esi+1C]
:0040F841 8D933C030000 lea edx, dword
ptr [ebx+0000033C]
:0040F847 66C746101400 mov [esi+10],
0014
:0040F84D 66C746102000 mov [esi+10],
0020
:0040F853 894DF8
mov dword ptr [ebp-08], ecx
:0040F856 FF461C
inc [esi+1C]
:0040F859 66C746101400 mov [esi+10],
0014
:0040F85F 66C746102C00 mov [esi+10],
002C
.......省略基本无关初始化的语句,来到下面的计算注册码的核心代码:
* Possible StringData Ref from Data Obj ->"0x"
|
:0040F9C6 B8F2E24E00 mov eax,
004EE2F2
:0040F9CB E828350C00 call 004D2EF8
:0040F9D0 8D45E4
lea eax, dword ptr [ebp-1C]
:0040F9D3 8B00
mov eax, dword ptr [eax]
:0040F9D5 E89AD00A00 call 004BCA74
:0040F9DA 8945B0
mov dword ptr [ebp-50], eax
:0040F9DD 8955B4
mov dword ptr [ebp-4C], edx
:0040F9E0 FF4E1C
dec [esi+1C]
:0040F9E3 8D45E4
lea eax, dword ptr [ebp-1C]
:0040F9E6 BA02000000 mov edx,
00000002
:0040F9EB E8C0310C00 call 004D2BB0
:0040F9F0 FF4E1C
dec [esi+1C]
:0040F9F3 8D45E8
lea eax, dword ptr [ebp-18]
:0040F9F6 BA02000000 mov edx,
00000002
:0040F9FB E8B0310C00 call 004D2BB0
:0040FA00 66C746101400 mov [esi+10],
0014
:0040FA06 33DB
xor ebx, ebx
:0040FA08 EB6E
jmp 0040FA78
--------------- 以上作用主要是把机器码转为16进制数,即0x...... ----------------
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040FAA4(C)
|
:0040FA0A 837DFC00 cmp
dword ptr [ebp-04], 00000000 <---[ebp-04]保存的是我们填入的E-mail。判断是否为空
:0040FA0E 7408
je 0040FA18
:0040FA10 8B45FC
mov eax, dword ptr [ebp-04] <---E-mail 地址
:0040FA13 8B50FC
mov edx, dword ptr [eax-04] <---E-mail 字符位数
:0040FA16 EB02
jmp 0040FA1A
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040FA0E(C)
|
:0040FA18 33D2
xor edx, edx
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040FA16(U)
|
:0040FA1A 3BDA
cmp ebx, edx <--- ebx初始值为0 ,并判断该计算E-mail字符位数是否大于已经循环的次数
:0040FA1C 7D3B
jge 0040FA59 <--- 若大于已经循环的次数,则转到0040FA59进行处理
:0040FA1E 8D7B01
lea edi, dword ptr [ebx+01]
:0040FA21 57
push edi
:0040FA22 8D45FC
lea eax, dword ptr [ebp-04]
:0040FA25 50
push eax
:0040FA26 E8652F0C00 call 004D2990
:0040FA2B 83C408
add esp, 00000008
:0040FA2E 8D45FC
lea eax, dword ptr [ebp-04]
:0040FA31 E8D2320C00 call 004D2D08
:0040FA36 037DFC
add edi, dword ptr [ebp-04]
:0040FA39 4F
dec edi
:0040FA3A 0FBE07
movsx eax, byte ptr [edi]
:0040FA3D 99
cdq <-----CDQ指令以方便做64位运算
:0040FA3E 52
push edx
:0040FA3F 50
push eax
:0040FA40 8B45B0
mov eax, dword ptr [ebp-50] <---保存机器码后 8 位计算的累计结果
:0040FA43 8B55B4
mov edx, dword ptr [ebp-4C] <---保存机器码前 8 位计算的累计结果
:0040FA46 E8D1BE0B00 call 004CB91C
----------------------call 004CB91C---start--------------------------
|:0040F1DE , :0040FA46 , :0040FA66
|
:004CB91C 52
push edx
:004CB91D 50
push eax
:004CB91E 8B442410 mov
eax, dword ptr [esp+10]
:004CB922 F72424
mul dword ptr [esp]
:004CB925 8BC8
mov ecx, eax
:004CB927 8B442404 mov
eax, dword ptr [esp+04] <---[esp+04]: 原始机器码前 8 位
:004CB92B F764240C mul
[esp+0C]
<---[esp+0c]保存E-mail码地址的ASCII的值或00:A1
并与原始机器码前 8 位相乘,结果保存在EDX(符号)和EAX(数值)
:004CB92F 03C8
add ecx, eax
<---ECX保存中间结果
:004CB931 8B0424
mov eax, dword ptr [esp] <---[Esp]: 原始机器码后 8 位
:004CB934 F764240C mul
[esp+0C]
<---[esp+0c]保存E-mail码地址的ASCII的值或00:A1
并与原始机器码后 8 位相乘,结果保存在EDX(符号)和EAX
:004CB938 03D1
add edx, ecx
<---EDX为上步运算结果的符号位,并与ECX相加
:004CB93A 59
pop ecx
:004CB93B 59
pop ecx
:004CB93C C20800
ret 0008
----------------------call 004CB91C---End---------------------------
:0040FA4B 83C001
add eax, 00000001 <----后8位计算结果加1
:0040FA4E 83D200
adc edx, 00000000 <----前8位计算结果加0(多此一举?*^_^*)
:0040FA51 8945B0
mov dword ptr [ebp-50], eax <----保存前8位计算结果
:0040FA54 8955B4
mov dword ptr [ebp-4C], edx <----保存后8位计算结果
:0040FA57 EB1E
jmp 0040FA77
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040FA1C(C)
|
:0040FA59 6A00
push 00000000
<-----符号位
:0040FA5B 68A1000000 push 000000A1
<-----原始值
:0040FA60 8B45B0
mov eax, dword ptr [ebp-50]
:0040FA63 8B55B4
mov edx, dword ptr [ebp-4C]
:0040FA66 E8B1BE0B00 call 004CB91C
<-----用00:A1代替原E-mail
地址的 ASCII码
依次与机器码前、后 8 位做相同运算
:0040FA6B 83C001
add eax, 00000001 -----
:0040FA6E 83D200
adc edx, 00000000
|---作用如前述。
:0040FA71 8945B0
mov dword ptr [ebp-50], eax |
:0040FA74 8955B4
mov dword ptr [ebp-4C], edx -----
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040FA57(U)
|
:0040FA77 43
inc ebx <---计算标志,用于判断E-mail字符串运算是否结束。
若结束,则用A1代替E-mail字符串的ASC值进行运算
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040FA08(U)
|
:0040FA78 837DFC00 cmp
dword ptr [ebp-04], 00000000
:0040FA7C 7408
je 0040FA86
:0040FA7E 8B4DFC
mov ecx, dword ptr [ebp-04] <---E-mail 地址
:0040FA81 8B41FC
mov eax, dword ptr [ecx-04] <---E-mail 位数
:0040FA84 EB02
jmp 0040FA88
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040FA7C(C)
|
:0040FA86 33C0
xor eax, eax
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040FA84(U)
|
:0040FA88 8945AC
mov dword ptr [ebp-54], eax
:0040FA8B C745A808000000 mov [ebp-58], 00000008
:0040FA92 8B55A8
mov edx, dword ptr [ebp-58]
:0040FA95 3B55AC
cmp edx, dword ptr [ebp-54]
:0040FA98 7E05
jle 0040FA9F
:0040FA9A 8D4DA8
lea ecx, dword ptr [ebp-58]
:0040FA9D EB03
jmp 0040FAA2
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040FA98(C)
|
:0040FA9F 8D4DAC
lea ecx, dword ptr [ebp-54]
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040FA9D(U)
|
:0040FAA2 3B19
cmp ebx, dword ptr [ecx] <---ecx=8
:0040FAA4 0F8C60FFFFFF jl 0040FA0A
<---循环 8 次
:0040FAAA 66C746105000 mov [esi+10],
0050
:0040FAB0 FF75B4
push [ebp-4C] <----保存最终后
8 位结果
:0040FAB3 FF75B0
push [ebp-50] <----保存最终前
8 位结果
:0040FAB6 33D2
xor edx, edx
:0040FAB8 B808000000 mov eax,
00000008
:0040FABD 8955E0
mov dword ptr [ebp-20], edx
将前、后 8 位结果算出后的最终结果作为字符串简单相加即为注册码。
。。。。。以下略。。。。
简单的举个例子:
我的机器码是:AEE0B7A4DE8E2DB5
E-mail为:1212
则注册码可这样得到:
第一次运行到0040FA1C并不跳转,因为刚开始计算的E-mail的ASCII码为第1个字符,并不大于总位数4。
让我们跟进0040FA46的这个Call。
首先将机器码前 8 位EDX(AEE0B7A4)、机器码后 8 位EAX(DE8E2DB5)压栈保存;
然后:
1. AEE0B7A4*31(1的ASC值)=21:79032644=EDX:EAX (谁能告诉我这符号值21是怎么运算得到的?)
2. 把EAX累加到ECX
3. DE8E2DB5*31(1的ASC值)=2A:9936BFA5=EDX:EAX
4. ECX+2A=7903268E,保存到EDX
5. 9936BFA5+1=9936BFA6 保存到[ebp-50]
6. 7903268E+0=7903268E 保存到[ebp-4C]
如此循环4(E-mail字符串位数)次后,再用A1代替E-mail的ASCII码值做同样的运算,
共再做4(=8-4)次循环运算,最终
[ebp-50]=20FD43A1 (后)
[ebp-4C]=9B8E2CEB (前)
把“”和“”合并起来得到“9B8E2CEB20FD43A1”,这就是我们所需要的注册码。
注册信息保存在HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\privatestorage\NLCDOWNLOAD键值下,删除即可重复注册。
谁能帮我写个注册机来?:)
Good LUCK!
Crack007[BCG]
2001-11-26
- 标 题:国图图书下载系统9.0的破解过程及注册码算法,谁能帮我写个注册机来?:) (13千字)
- 作 者:crack007
- 时 间:2001-11-26 20:53:48
- 链 接:http://bbs.pediy.com