【文章标题】: 《*****查询软件》注册算法分析
【文章作者】: Suncl0ud
【作者邮箱】: ihacku@163.com
【软件名称】: TC2.0函数查询软件
【下载地址】: 见附件
【加壳方式】: 未加壳
【编写语言】: Visual C++ 6.0
【软件介绍】: 一款c语言学习软件。
【作者声明】: 只是感兴趣，没有其他目的。失误之处敬请诸位大侠赐教!
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【详细过程】
PEiD查看软件没有加壳。
软件语言：Microsoft Visual C++ 6.0
用 W32dasm 很容易定位注册算法，下面重点介绍算法分析（看代码注释）：
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
00417CFC 51 push ecx ; 假码AC6EE8
00417CFD 8D5424 14 lea edx,dword ptr ss:[esp+14] ; edx->用户名
00417D01 8BCC mov ecx,esp ; ecx->假码
00417D03 896424 1C mov dword ptr ss:[esp+1C],esp ; [esp+1C]->假码
00417D07 52 push edx ; 用户名指针入栈
00417D08 E8 9E0A02>call tcsearch.004387AB ; eax->用户名
00417D0D 8D7E 5C lea edi,dword ptr ds:[esi+5C] ; edi="hfD"[68 66 44 00]
00417D10 8D4424 1C lea eax,dword ptr ss:[esp+1C] ; [eax]=用户名
00417D14 50 push eax ; eax压栈
00417D15 8BCF mov ecx,edi ; ecx=edi
00417D17 E8 C40300>call tcsearch.004180E0 ; *******算法call********
00417D1C 50 push eax
00417D1D 8D4C24 18 lea ecx,dword ptr ss:[esp+18]
00417D21 C64424 28>mov byte ptr ss:[esp+28],3
00417D26 E8 000E02>call tcsearch.00438B2B
00417D2B 8D4C24 18 lea ecx,dword ptr ss:[esp+18] ; ecx->真码
00417D2F C64424 24>mov byte ptr ss:[esp+24],2
00417D34 E8 FD0C02>call tcsearch.00438A36
00417D39 8B4C24 0C mov ecx,dword ptr ss:[esp+C]
00417D3D 8B5424 14 mov edx,dword ptr ss:[esp+14]
00417D41 51 push ecx
00417D42 52 push edx
00417D43 E8 2C0B01>call tcsearch.00428874 ; 关键call
00417D48 83C4 08 add esp,8
00417D4B 85C0 test eax,eax
00417D4D 75 15 jnz short tcsearch.00417D64 ; 关键跳，跳转则出错
00417D4F 8BCF mov ecx,edi
00417D51 E8 5A0300>call tcsearch.004180B0
00417D56 53 push ebx
00417D57 53 push ebx
00417D58 68 30D747>push tcsearch.0047D730
00417D5D E8 507B02>call tcsearch.0043F8B2
00417D62 EB 15 jmp short tcsearch.00417D79
00417D64 53 push ebx
00417D65 6A 10 push 10
00417D67 68 0CD747>push tcsearch.0047D70C
00417D6C E8 417B02>call tcsearch.0043F8B2 ; 错误提示
00417D71 53 push ebx
00417D72 8BCE mov ecx,esi
00417D74 E8 653B02>call tcsearch.0043B8DE
00417D79 8BCE mov ecx,esi
00417D7B E8 E81702>call tcsearch.00439568
00417D80 8D4C24 14 lea ecx,dword ptr ss:[esp+14]
00417D84 C64424 24>mov byte ptr ss:[esp+24],1
00417D89 E8 A80C02>call tcsearch.00438A36
00417D8E 8D4C24 0C lea ecx,dword ptr ss:[esp+C]%0
D
00417D92 885C24 24 mov byte ptr ss:[esp+24],bl
00417D96 E8 9B0C02>call tcsearch.00438A36
00417D9B 8D4C24 10 lea ecx,dword ptr ss:[esp+10]
00417D9F C74424 24>mov dword ptr ss:[esp+24],-1
00417DA7 E8 8A0C02>call tcsearch.00438A36
00417DAC 8B4C24 1C mov ecx,dword ptr ss:[esp+1C]
00417DB0 5F pop edi
00417DB1 5E pop esi
00417DB2 64:890D 0>mov dword ptr fs:[0],ecx
00417DB9 5B pop ebx
00417DBA 83C4 1C add esp,1C
00417DBD C3 retn
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
下面跟进算法call进行分析，继续：
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
004180E0 6A FF push -1
004180E2 68 BF4144>push tcsearch.004441BF
004180E7 64:A1 000>mov eax,dword ptr fs:[0]
004180ED 50 push eax
004180EE 64:8925 0>mov dword ptr fs:[0],esp ; SEH
004180F5 83EC 40 sub esp,40 ; 开辟临时变量空间
004180F8 53 push ebx ; \
004180F9 55 push ebp ; |
004180FA 56 push esi ; |
004180FB 57 push edi ; /保存寄存器
004180FC 33FF xor edi,edi
004180FE 897C24 34 mov dword ptr ss:[esp+34],edi ; 0013ADEC=0
00418102 A1 40DA47>mov eax,dword ptr ds:[47DA40] ; eax=0047DA54
00418107 C74424 58>mov dword ptr ss:[esp+58],1 ; 0013AE10=1~~~
0041810F 897C24 14 mov dword ptr ss:[esp+14],edi ; 0013ADCC=0
00418113 33DB xor ebx,ebx
00418115 897C24 24 mov dword ptr ss:[esp+24],edi ; 0013ADDC=0
00418119 894424 18 mov dword ptr ss:[esp+18],eax ; 0013ADd0=47DA54
0041811D 8B4C24 64 mov ecx,dword ptr ss:[esp+64] ; ecx=用户名
00418121 8D5424 1C lea edx,dword ptr ss:[esp+1C] ;
00418125 52 push edx
00418126 C64424 5C>mov byte ptr ss:[esp+5C],2 ;
0041812B 8B69 F8 mov ebp,dword ptr ds:[ecx-8] ; ebp=len(用户名)
0041812E 896C24 34 mov dword ptr ss:[esp+34],ebp ; 0013ADE8=len(用户名)
00418132 E8 9FF301>call tcsearch.004374D6 ;
00418137 8B00 mov eax,dword ptr ds:[eax] ; eax=[eax]=46722B2F
00418139 8D4C24 28 lea ecx,dword ptr ss:[esp+28] ; ecx=0013ADE0
0041813D 68 9CD747>push tcsearch.0047D79C ; %Y%m%d
00418142 51 push ecx ; ecx压栈
00418143 8D4C24 34 lea ecx,dword ptr ss:[esp+34] ; ecx=0013ADE4
00418147 894424 34 mov dword ptr ss:[esp+34],eax ; 0013ADE4=eax
0041814B E8 99F301>call tcsearch.004374E9 ; eax="年月日"
00418150 3BEF cmp ebp,edi
00418152 C64424 58>mov byte ptr ss:[esp+58],3 ;
00418157 0F84 3402>je tcsearch.00418391 ; ebp=edi则跳
0041815D BE 010000>mov esi,1 ; esi=1
00418162 3BEE cmp ebp,esi
00418164 897424 1C mov dword ptr ss:[esp+1C],esi ; [13ADD4]=esi
00418168 0F8C 3701>jl tcsearch.004182A5 ; ebp<esi则跳
0041816E 8B4424 28 mov eax,dword ptr ss:[esp+28] ; !!!!!eax=年月日!!!!!!
00418172 DD05 8066>fld qword ptr ds:[446680] ; st=0
00418178 8A58 06 mov bl,byte ptr ds:[eax+6] ; bl=date[6]
0041817B 8A48 04 mov cl,byte ptr ds:[eax+4] ; cl=date[4]
0041817E 885C24 13 mov byte ptr ss:[esp+13],bl ; [13ADCB]=bl
00418182 8A58 07 mov bl,byte ptr ds:[eax+7] ; bl=date[7]
00418185 0FBEDB movsx ebx,bl
00418188 895C24 24 mov dword ptr ss:[esp+24],ebx ; 0013ADDC=ebx
0041818C 8A50 05 mov dl,byte ptr ds:[eax+5] ; dl=date[5]
0041818F DB4424 24 fild dword ptr ss:[esp+24]
00418193 0FBE5C24 >movsx ebx,byte ptr ss:[esp+13]
00418198 D9FA fsqrt ; st开方
0041819A 895C24 24 mov dword ptr ss:[esp+24],ebx
0041819E 8A40 03 mov al,byte ptr ds:[eax+3] ; date[3]
004181A1 0FBEC0 movsx eax,al
004181A4 0FBEEA movsx ebp,dl
004181A7 0FBEC9 movsx ecx,cl ; 1
004181AA DB4424 24 fild dword ptr ss:[esp+24]
004181AE 0FAFE9 imul ebp,ecx ; !!!!!这里是ebp
004181B1 D9FA fsqrt
004181B3 894424 24 mov dword ptr ss:[esp+24],eax
004181B7 DEC9 fmulp st(1),st ; sqrt(d[6]*d[7])
004181B9 DD5C24 38 fstp qword ptr ss:[esp+38] ; !!!!这里是esp+38
004181BD DB4424 24 fild dword ptr ss:[esp+24]
004181C1 D9FA fsqrt
004181C3 DCC0 fadd st,st
004181C5 DD5C24 40 fstp qword ptr ss:[esp+40] ; !!!!!这里是[esp+40]
004181C9 8B5424 64 mov edx,dword ptr ss:[esp+64] ; edx=用户名;name
004181CD DB4424 1C fild dword ptr ss:[esp+1C] ; \
004181D1 8A5C32 FF mov bl,byte ptr ds:[edx+esi-1] ; |bl=name[esi-1]
004181D5 0FBEC3 movsx eax,bl ; |[esp+C]=i
004181D8 DD5C24 1C fstp qword ptr ss:[esp+1C] ; /
004181DC 894424 24 mov dword ptr ss:[esp+24],eax ; \
004181E0 DB4424 24 fild dword ptr ss:[esp+24] ; |
004181E4 0FBECB movsx ecx,bl
004181E7 D9FA fsqrt ; name[esi-1]开方
004181E9 0FAFCE imul ecx,esi
004181EC DC4C24 1C fmul qword ptr ss:[esp+1C]
004181F0 DC05 7866>fadd qword ptr ds:[446678]
004181F6 0FAFCE imul ecx,esi
004181F9 0FAFCE imul ecx,esi
004181FC 894C24 24 mov dword ptr ss:[esp+24],ecx
00418200 DB4424 24 fild dword ptr ss:[esp+24]
00418204 DEC9 fmulp st(1),st ; |
00418206 D8C1 fadd st,st(1) ; /num1
00418208 E8 930901>call tcsearch.00428BA0 ; float_to_long_int()
0041820D 99 cdq ; 把EAX中的字的符号扩展到EDX中
0041820E DDD8 fstp st
00418210 B9 180100>mov ecx,118 ; ecx=118
00418215 F7F9 idiv ecx
00418217 895424 14 mov dword ptr ss:[esp+14],edx ; num1%118h
0041821B 0FBED3 movsx edx,bl
0041821E 895424 24 mov dword ptr ss:[esp+24],edx
00418222 DB4424 24 fild dword ptr ss:[esp+24] ; 整型[esp+24]压入st0
00418226 DD05 7066>fld qword ptr ds:[446670] ; 2.0
0041822C E8 4F0701>call tcsearch.00428980 ; pow([esp+24],2)即[esp+24]^2
00418231 DC4C24 1C fmul qword ptr ss:[esp+1C] ; st0*位数
00418235 E8 660901>call tcsearch.00428BA0 ; float_to_long_int()
0041823A DB4424 14 fild dword ptr ss:[esp+14]
0041823E 8BCE mov ecx,esi
00418240 0FAFCF imul ecx,edi
00418243 D9C0 fld st
00418245 D9FA fsqrt
00418247 03C1 add eax,ecx ; eax为num3
00418249 B9 2C0100>mov ecx,12C
0041824E 99 cdq
0041824F F7F9 idiv ecx
00418251 8BFA mov edi,edx ; 最后的edi
00418253 E8 480901>call tcsearch.00428BA0 ; float_to_long_int()
00418258 03C7 add eax,edi
0041825A B9 A08601>mov ecx,186A0
0041825F 99 cdq
00418260 DD4424 38 fld qword ptr ss:[esp+38]
00418264 F7F9 idiv ecx
00418266 DC4C24 1C fmul qword ptr ss:[esp+1C]
0041826A DC4424 40 fadd qword ptr ss:[esp+40]
0041826E 8BDA mov ebx,edx
00418270 8BD5 mov edx,ebp
00418272 0FAFD6 imul edx,esi
00418275 895424 24 mov dword ptr ss:[esp+24],edx
00418279 DB4424 24 fild dword ptr ss:[esp+24]
0041827D DEC9 fmulp st(1),st
0041827F D8C1 fadd st,st(1)
00418281 E8 1A0901>call tcsearch.00428BA0 ; float_to_long_int()
00418286 99 cdq
00418287 B9 180100>mov ecx,118
0041828C F7F9 idiv ecx
0041828E 8B4424 30 mov eax,dword ptr ss:[esp+30]
00418292 46 inc esi ; esi++；循环递进
00418293 3BF0 cmp esi,eax
00418295 897424 1C mov dword ptr ss:[esp+1C],esi
00418299 895424 24 mov dword ptr ss:[esp+24],edx
0041829D ^ 0F8E 26FF>jle tcsearch.004181C9 ; esi<=eax则跳转循环
004182A3 DDD8 fstp st
004182A5 33C9 xor ecx,ecx
004182A7 8BD1 mov edx,ecx
004182A9 8B4424 14 mov eax,dword ptr ss:[esp+14]
004182AD 0FAFD1 imul edx,ecx
004182B0 0FAFD1 imul edx,ecx
004182B3 BE 4E0000>mov esi,4E
004182B8 8D4402 1F lea eax,dword ptr ds:[edx+eax+1F]
004182BC 99 cdq
004182BD F7FE idiv esi
004182BF 41 inc ecx
004182C0 83F9 05 cmp ecx,5
004182C3 88540C 3F mov byte ptr ss:[esp+ecx+3F],dl
004182C7 ^ 7C DE jl short tcsearch.004182A7 ; 循环五次
004182C9 B9 050000>mov ecx,5
004182CE 8BD1 mov edx,ecx
004182D0 BE 580000>mov esi,58
004182D5 0FAFD1 imul edx,ecx
004182D8 0FAFD1 imul edx,ecx
004182DB 8D443A 1F lea eax,dword ptr ds:[edx+edi+1F]
004182DF 99 cdq
004182E0 F7FE idiv esi
004182E2 41 inc ecx
004182E3 83F9 0A cmp ecx,0A
004182E6 88540C 3F mov byte ptr ss:[esp+ecx+3F],dl
004182EA ^ 7C E2 jl short tcsearch.004182CE ; 又循环五次
004182EC B9 0A0000>mov ecx,0A
004182F1 8BC1 mov eax,ecx
004182F3 BE 260000>mov esi,26
004182F8 0FAFC1 imul eax,ecx
004182FB 0FAFC1 imul eax,ecx
004182FE 8D4418 1F lea eax,dword ptr ds:[eax+ebx+1F]
00418302 99 cdq
00418303 F7FE idiv esi
00418305 41 inc ecx
00418306 83F9 0F cmp ecx,0F
00418309 88540C 3F mov byte ptr ss:[esp+ecx+3F],dl
0041830D ^ 7C E2 jl short tcsearch.004182F1 ; 又循环五次
0041830F B9 0F0000>mov ecx,0F
00418314 8BD1 mov edx,ecx
00418316 8B4424 24 mov eax,dword ptr ss:[esp+24]
0041831A 0FAFD1 imul edx,ecx
0041831D 0FAFD1 imul edx,ecx
00418320 BE 120000>mov esi,12
00418325 8D4402 1F lea eax,dword ptr ds:[edx+eax+1F]
00418329 99 cdq
0041832A F7FE idiv esi
0041832C 41 inc ecx
0041832D 83F9 14 cmp ecx,14
00418330 88540C 3F mov byte ptr ss:[esp+ecx+3F],dl
00418334 ^ 7C DE jl short tcsearch.00418314 ; 又循环五次
00418336 33D2 xor edx,edx ; edx=0
00418338 33C9 xor ecx,ecx ; ecx=0
0041833A 8A4414 40 mov al,byte ptr ss:[esp+edx+40] ; \
0041833E 3C 30 cmp al,30 ; |
00418340 7C 04 jl short tcsearch.00418346 ; |
00418342 3C 39 cmp al,39 ; |
00418344 7E 29 jle short tcsearch.0041836F ; |
00418346 3C 41 cmp al,41 ; |
00418348 7C 04 jl short tcsearch.0041834E ; |
0041834A 3C 5A cmp al,5A ; |
0041834C 7E 21 jle short tcsearch.0041836F ; |
0041834E 3C 61 cmp al,61 ; |
00418350 7C 04 jl short tcsearch.00418356 ; |
00418352 3C 7A cmp al,7A ; |
00418354 7E 19 jle short tcsearch.0041836F ; |
00418356 0FBEC0 movsx eax,al ; |
00418359 8D4408 1F lea eax,dword ptr ds:[eax+ecx+1F] ; |
0041835D 25 7F0000>and eax,8000007F ; |
00418362 79 05 jns short tcsearch.00418369 ; |
00418364 48 dec eax ; |
00418365 83C8 80 or eax,FFFFFF80 ; |
00418368 40 inc eax ; |
00418369 884414 40 mov byte ptr ss:[esp+edx+40],al ; |
0041836D ^ EB CB jmp short tcsearch.0041833A ; |
0041836F 83C1 07 add ecx,7 ; |
00418372 42 inc edx ; |取下一个字符
00418373 81F9 8C00>cmp ecx,8C ; |
00418379 ^ 7C BF jl short tcsearch.0041833A ; /循环生成字符串
0041837B 33F6 xor esi,esi
0041837D 8A4C34 40 mov cl,byte ptr ss:[esp+esi+40]
00418381 51 push ecx
00418382 8D4C24 1C lea ecx,dword ptr ss:[esp+1C]
00418386 E8 690902>call tcsearch.00438CF4
0041838B 46 inc esi
0041838C 83FE 14 cmp esi,14
0041838F ^ 7C EC jl short tcsearch.0041837D
00418391 8B7424 60 mov esi,dword ptr ss:[esp+60]
00418395 8D5424 18 lea edx,dword ptr ss:[esp+18]
00418399 52 push edx
0041839A 8BCE mov ecx,esi
0041839C E8 0A0402>call tcsearch.004387AB
004183A1 C74424 34>mov dword ptr ss:[esp+34],1
004183A9 8D4C24 28 lea ecx,dword ptr ss:[esp+28]
004183AD C64424 58>mov byte ptr ss:[esp+58],2
004183B2 E8 7F0602>call tcsearch.00438A36
004183B7 8D4C24 18 lea ecx,dword ptr ss:[esp+18]
004183BB C64424 58>mov byte ptr ss:[esp+58],1
004183C0 E8 710602>call tcsearch.00438A36
004183C5 8D4C24 64 lea ecx,dword ptr ss:[esp+64]
004183C9 C64424 58>mov byte ptr ss:[esp+58],0
004183CE E8 630602>call tcsearch.00438A36
004183D3 8B4C24 50 mov ecx,dword ptr ss:[esp+50]
004183D7 8BC6 mov eax,esi
004183D9 5F pop edi
004183DA 5E pop esi
004183DB 5D pop ebp
004183DC 5B pop ebx
004183DD 64:890D 0>mov dword ptr fs:[0],ecx
004183E4 83C4 4C add esp,4C
004183E7 C2 0800 retn 8
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
在算法call中，这个软件是根据 用户名 和 注册时的时间 计算出注册码的。
涉及到很多浮点指令的运算，比较繁琐。
期间的一些循环处理过程，我在做注册机时是直接从OD中提取出汇编代码嵌入到C++内使用的。
具体注册算法大家看我注册机的源文件。
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【版权声明】: 本文原创，转载请注明作者并保持文章的完整，谢谢!
2007年10月27日 15:18:45
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