ezConverter V1.0.596 Build 2003.04.24 简体中文版 算法分析
下载页面： http://www.skycn.com/soft/11099.html
软件大小： 591 KB
软件语言： 简体中文
软件类别： 国产软件 / 共享版 / 音频转换
应用平台： Win9x/NT/2000/XP
加入时间： 2003-04-25 09:51:42
下载次数： 11062
推荐等级： ***
开 发 商： http://www.goldlimit.com/
【软件简介】： 1: 支持的格式多,可将 asf,wmv,wma,wav, mp3、mpeg,dat,dvd,avi,cd音轨,磁带,话筒等 转换为：wma, mp3, wav 及20多种音频格式；2: 可从音频硬件采集声音(包括话筒,线路输入,混音器、磁带等)然后存为 20多种格式,你甚至可以将录音机里的广播录制到电脑里并存成mp3文件！ 3: 完全支持第三方免费编解码器，将你电脑潜在的转换，功能发挥到极致。 4: 速度极快,比一般的转换器快出30%； 5: 没有复杂的操作,极易使用。
【软件限制】：NAG、试用30次。
【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】：
ezConverter.exe 无壳。 Visual C++ 6.0 编写。
软件把试炼码保存在同目录下的erf.dat文件中重启时验证，简单的方法是在反汇编代码里查找蛛丝马迹。
注册名：flysky （提示要求至少6位）
试炼码：13572468
—————————————————————————————————
* Reference To: KERNEL32.FreeLibrary, Ord:00B4h
|
:00404EBA FF1534D04000 Call dword ptr [0040D034]
:00404EC0 83CDFF or ebp, FFFFFFFF
:00404EC3 8D7C2440 lea edi, dword ptr [esp+40]
====>EDI=flysky 注册名
:00404EC7 8BCD mov ecx, ebp
:00404EC9 33C0 xor eax, eax
:00404ECB F2 repnz
:00404ECC AE scasb
:00404ECD F7D1 not ecx
:00404ECF 49 dec ecx
====>取用户名长度 ECX=6
:00404ED0 83F901 cmp ecx, 00000001
:00404ED3 0F82BC010000 jb 00405095
:00404ED9 8D7C2464 lea edi, dword ptr [esp+64]
====>EDI=13572468 试炼码
:00404EDD 8BCD mov ecx, ebp
:00404EDF F2 repnz
:00404EE0 AE scasb
:00404EE1 F7D1 not ecx
:00404EE3 49 dec ecx
:00404EE4 83F901 cmp ecx, 00000001
:00404EE7 0F82A8010000 jb 00405095
:00404EED 8D7C2440 lea edi, dword ptr [esp+40]
:00404EF1 8BCD mov ecx, ebp
:00404EF3 F2 repnz
:00404EF4 AE scasb
* Reference To: USER32.CharUpperA, Ord:002Fh
|
:00404EF5 8B1D9CD44000 mov ebx, dword ptr [0040D49C]
:00404EFB 8BF5 mov esi, ebp
:00404EFD F7D1 not ecx
:00404EFF 49 dec ecx
:00404F00 8BF9 mov edi, ecx
:00404F02 8D4C2440 lea ecx, dword ptr [esp+40]
:00404F06 51 push ecx
:00404F07 FFD3 call ebx
====>EDI=把flysky转化为大写FLYSKY
:00404F09 33C9 xor ecx, ecx
:00404F0B 85FF test edi, edi
:00404F0D 7E6B jle 00404F7A
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:00404F75(C)
|
:00404F0F 8BC1 mov eax, ecx
====>从0开始计数。与3求模，根据余数值进行相应运算。
:00404F11 BD03000000 mov ebp, 00000003
====>EBP=3
:00404F16 99 cdq
:00404F17 F7FD idiv ebp
:00404F19 46 inc esi
:00404F1A 85D2 test edx, edx
:00404F1C 7517 jne 00404F35
====>余数不为0就跳
:00404F1E 8A440C40 mov al, byte ptr [esp+ecx+40]
====>EDI=[esp+ecx+40]=FLYSKY
:00404F22 0FBED0 movsx edx, al
:00404F25 83EA05 sub edx, 00000005
:00404F28 83FA41 cmp edx, 00000041
:00404F2B 7E04 jle 00404F31
====>-5后不大于41则跳跳下去+5
:00404F2D 2C05 sub al, 05
====>第4位此处-5 即：循环计数的第3次
4、 ====>AL=53 - 5=4E 即：N
:00404F2F EB3A jmp 00404F6B
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:00404F2B(C)
|
:00404F31 0405 add al, 05
====>第1位此处加5
1、 ====>AL=46 + 5=4B 即：K
:00404F33 EB36 jmp 00404F6B
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:00404F1C(C)
|
:00404F35 83FA01 cmp edx, 00000001
:00404F38 7517 jne 00404F51
:00404F3A 8A440C40 mov al, byte ptr [esp+ecx+40]
:00404F3E 0FBED0 movsx edx, al
:00404F41 83C207 add edx, 00000007
:00404F44 83FA5A cmp edx, 0000005A
:00404F47 7D04 jge 00404F4D
====>+7后不小于5A则跳跳下去-7
:00404F49 0407 add al, 07
====>第2、5位此处加7
2、 ====>AL=4C + 7=53 即：S
5、 ====>AL=4B + 7=52 即：R
:00404F4B EB1E jmp 00404F6B
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:00404F47(C)
|
:00404F4D 2C07 sub al, 07
:00404F4F EB1A jmp 00404F6B
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:00404F38(C)
|
:00404F51 83FA02 cmp edx, 00000002
:00404F54 751C jne 00404F72
:00404F56 8A440C40 mov al, byte ptr [esp+ecx+40]
:00404F5A 0FBED0 movsx edx, al
:00404F5D 83EA09 sub edx, 00000009
:00404F60 83FA41 cmp edx, 00000041
:00404F63 7E04 jle 00404F69
====>-9后不大于41则跳下去+9
:00404F65 2C09 sub al, 09
====>第3、6位此处-9
3、 ====>AL=59 - 9=50 即：P
6、 ====>AL=59 - 9=50 即：P
:00404F67 EB02 jmp 00404F6B
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:00404F63(C)
|
:00404F69 0409 add al, 09
* Referenced by a (U)nconditional or (C)onditional Jump at Addresses:
|:00404F2F(U), :00404F33(U), :00404F4B(U), :00404F4F(U), :00404F67(U)
|
:00404F6B 88843488000000 mov byte ptr [esp+esi+00000088], al
====>保存结果 FLYSKY 转化为KSPNRP
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:00404F54(C)
|
:00404F72 41 inc ecx
:00404F73 3BCF cmp ecx, edi
:00404F75 7C98 jl 00404F0F
====>循环
:00404F77 83CDFF or ebp, FFFFFFFF
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:00404F0D(C)
|
:00404F7A DD05D8DD4000 fld qword ptr [0040DDD8]
:00404F80 33C0 xor eax, eax
:00404F82 85F6 test esi, esi
====>ESI=5
:00404F84 7E17 jle 00404F9D
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:00404F9B(C)
|
:00404F86 0FBE8C0488000000 movsx ecx, byte ptr [esp+eax+00000088]
====>依次取KSPNRP字符HEX值的10进制值
:00404F8E 894C2414 mov dword ptr [esp+14], ecx
:00404F92 40 inc eax
====>EAX增1
:00404F93 DB442414 fild dword ptr [esp+14]
:00404F97 3BC6 cmp eax, esi
====>EAX已增1，所以只取前5位的值累加
:00404F99 DEC1 faddp st(1), st(0)
====>其实是浮点数累加
====>st(0)=75+83+80+78+82=398.00000000000000000
:00404F9B 7CE9 jl 00404F86
====>循环
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:00404F84(C)
|
:00404F9D D9C0 fld st(0), st(0)
:00404F9F D9FE fsin
====>取SIN值398.00000000000000000=0.8317580087191733248
:00404FA1 D9FF fcos
====>取COS值0.8317580087191733248=0.6735774280714966016
:00404FA3 D9FE fsin
====>取SIN值0.6735774280714966016=0.6237860730035777536
:00404FA5 D9FF fcos
====>取COS值0.6237860730035777536=0.8116727871807730688
:00404FA7 D9FE fsin
====>取SIN值0.8116727871807730688=0.7254395446159557632
:00404FA9 DD542414 fst qword ptr [esp+14]
:00404FAD DC1DD8DD4000 fcomp qword ptr [0040DDD8]
:00404FB3 DFE0 fstsw ax
:00404FB5 F6C401 test ah, 01
:00404FB8 7423 je 00404FDD
====>跳了下去 这个测试不清楚。
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:00404FDB(C)
|
:00404FBA DC0DD0DD4000 fmul qword ptr [0040DDD0]
:00404FC0 D9C0 fld st(0), st(0)
:00404FC2 D9FE fsin
:00404FC4 D9FF fcos
:00404FC6 D9FE fsin
:00404FC8 D9FF fcos
:00404FCA D9FE fsin
:00404FCC DD542414 fst qword ptr [esp+14]
:00404FD0 DC1DD8DD4000 fcomp qword ptr [0040DDD8]
:00404FD6 DFE0 fstsw ax
:00404FD8 F6C401 test ah, 01
:00404FDB 75DD jne 00404FBA
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:00404FB8(C)
|
:00404FDD 8B542418 mov edx, dword ptr [esp+18]
:00404FE1 8B442414 mov eax, dword ptr [esp+14]
:00404FE5 52 push edx
:00404FE6 50 push eax
:00404FE7 8D8C24E0000000 lea ecx, dword ptr [esp+000000E0]
* Possible StringData Ref from Data Obj ->"%.14f"
|
:00404FEE 6874134100 push 00411374
:00404FF3 51 push ecx
:00404FF4 DDD8 fstp st(0)
* Reference To: MSVCRT.sprintf, Ord:02B2h
|
:00404FF6 FF1528D44000 Call dword ptr [0040D428]
====>四舍五入取0.7254395446159557632的前16位
:00404FFC 8DBC24E8000000 lea edi, dword ptr [esp+000000E8]
====>EDI=0.72543954461596
:00405003 8BCD mov ecx, ebp
:00405005 33C0 xor eax, eax
:00405007 83C410 add esp, 00000010
:0040500A 33D2 xor edx, edx
:0040500C F2 repnz
:0040500D AE scasb
:0040500E F7D1 not ecx
:00405010 49 dec ecx
:00405011 83E902 sub ecx, 00000002
:00405014 7427 je 0040503D
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040503B(C)
|
:00405016 8A8414DA000000 mov al, byte ptr [esp+edx+000000DA]
====>依次取0.725439544615956小数点后字符的HEX值
:0040501D 8DBC24D8000000 lea edi, dword ptr [esp+000000D8]
:00405024 0441 add al, 41
====>依次+41 只记5位了，因为后面只取5位。即：用户名位数-1
1、 ====>37 + 41=78 即：x
2、 ====>32 + 41=73 即：s
3、 ====>35 + 41=76 即：v
4、 ====>34 + 41=75 即：u
5、 ====>33 + 41=74 即：t
:00405026 8BCD mov ecx, ebp
:00405028 88841488000000 mov byte ptr [esp+edx+00000088], al
====>保存在 [esp+edx+00000088]
:0040502F 33C0 xor eax, eax
:00405031 42 inc edx
:00405032 F2 repnz
:00405033 AE scasb
:00405034 F7D1 not ecx
:00405036 83C1FD add ecx, FFFFFFFD
:00405039 3BD1 cmp edx, ecx
:0040503B 72D9 jb 00405016
====>循环
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:00405014(C)
|
:0040503D 8D8C2488000000 lea ecx, dword ptr [esp+00000088]
:00405044 C684348800000000 mov byte ptr [esp+esi+00000088], 00
====>多于5位的换成00了。只取用户名位数-1
:0040504C 51 push ecx
====>ECX=xsvut
:0040504D FFD3 call ebx
====>把 xsvut 转换成大写字母 XSVUT
:0040504F 8D7C2464 lea edi, dword ptr [esp+64]
====>EDI=13572468 试炼码
:00405053 8BCD mov ecx, ebp
:00405055 33C0 xor eax, eax
:00405057 8DB42488000000 lea esi, dword ptr [esp+00000088]
====>ESI=XSVUT 注册码
:0040505E F2 repnz
:0040505F AE scasb
:00405060 F7D1 not ecx
:00405062 49 dec ecx
:00405063 8D7C2464 lea edi, dword ptr [esp+64]
:00405067 33D2 xor edx, edx
:00405069 89AC2430010000 mov dword ptr [esp+00000130], ebp
:00405070 F3 repz
:00405071 A6 cmpsb
====>逐位比较。有一处不同就OVER了。
:00405072 8D4C2410 lea ecx, dword ptr [esp+10]
:00405076 7528 jne 004050A0
====>跳则OVER！
* Reference To: MFC42.Ordinal:0320, Ord:0320h
|
:00405078 E8D3640000 Call 0040B550
:0040507D B001 mov al, 01
====>置1则OK！
:0040507F 8B8C2428010000 mov ecx, dword ptr [esp+00000128]
:00405086 64890D00000000 mov dword ptr fs:[00000000], ecx
:0040508D 5F pop edi
:0040508E 5E pop esi
:0040508F 5D pop ebp
:00405090 5B pop ebx
:00405091 8BE5 mov esp, ebp
:00405093 5D pop ebp
:00405094 C3 ret
* Referenced by a (U)nconditional or (C)onditional Jump at Addresses:
|:00404ED3(C), :00404EE7(C)
|
:00405095 89AC2430010000 mov dword ptr [esp+00000130], ebp
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:00404E0A(U)
|
:0040509C 8D4C2410 lea ecx, dword ptr [esp+10]
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:00405076(C)
|
* Reference To: MFC42.Ordinal:0320, Ord:0320h
|
:004050A0 E8AB640000 Call 0040B550
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:00404D86(C)
|
:004050A5 8B8C2428010000 mov ecx, dword ptr [esp+00000128]
:004050AC 5F pop edi
:004050AD 32C0 xor al, al
====>清0则OVER！爆破点！
:004050AF 64890D00000000 mov dword ptr fs:[00000000], ecx
:004050B6 5E pop esi
:004050B7 5D pop ebp
:004050B8 5B pop ebx
:004050B9 8BE5 mov esp, ebp
:004050BB 5D pop ebp
:004050BC C3 ret
—————————————————————————————————
【完 美 爆 破】：
004050AD 32C0 xor al, al
改为： B001 mov al, 01 与0040507D处相映成趣！让其永远返回1。
—————————————————————————————————
【KeyMake之{74th}内存注册机】：
中断地址：00405067
中断次数：1
第一字节：33
指令长度：2
内存方式：ESI
—————————————————————————————————
【注册信息保存】：
同目录下的erf.dat文件中。
—————————————————————————————————
【整 理】：
注册名：flysky
注册号：XSVUT
—————————————————————————————————
, _/
/| _.-~/ \_ , 青春都一饷
( /~ / \~-._ |\
`\\ _/ \ ~\ ) 忍把浮名
_-~~~-.) )__/;;,. \_ //'
/'_,\ --~ \ ~~~- ,;;\___( (.-~~~-. 换了破解轻狂
`~ _( ,_..--\ ( ,;'' / ~-- /._`\
/~~//' /' `~\ ) /--.._, )_ `~
" `~" " `" /~'`\ `\\~~\
" " "~' ""
Cracked By 巢水工作坊——fly [OCN][FCG]
2003-04-28 23:31
（出处：嬴政天下整理收藏）
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