一、BlowFish算法说明（文中数据类型以Tc2.0为准）
BlowFish算法用来加密64Bit长度的字符串。
BlowFish算法使用两个“盒”——ungigned long pbox[18]和unsigned long sbox[4,256]。
BlowFish算法中，有一个核心加密函数:BF_En(后文详细介绍）。该函数输入64位信息，运算后， 以64位密文的形式输出。 用BlowFish算法加密信息，需要两个过程：
1.密钥预处理
2.信息加密
分别说明如下：
密钥预处理：
BlowFish算法的源密钥——pbox和sbox是固定的。我们要加密一个信息，需要自己选择一个key， 用这个key对pbox和sbox进行变换，得到下一步信息加密所要用的key_pbox和key_sbox。具体的变化算法如下：
1)用sbox填充key_sbox
2)用自己选择的key8个一组地去异或pbox，用异或的结果填充key_pbox。key可以循环使用。
比如说：选的key是"abcdefghijklmn"。则异或过程为：
key_pbox[0]=pbox[0]^abcdefgh
key_pbox[1]=pbox[1]^ijklmnab
…………
…………
如此循环，直到key_box填充完毕。
3)用BF_En加密一个全0的64位信息，用输出的结果替换key_pbox[0]和key_pbox[1]。i=0
4)用BF_En加密替换后的key_pbox[i],key_pbox[i+1],用输出替代key_pbox[i+2]和key_pbox[i+3]
5)i+2，继续第4步，直到key_pbox全部被替换
6)用key_pbox[16]和key_pbox[17]做首次输入（相当于上面的全0的输入），用类似的方法，替换key_sbox 信息加密。信息加密就是用函数把待加密信息x分成32位的两部分:xL,xR BF_En对输入信息进行变换，BF_En函数详细过程如下：
对于i=1至16
xL=xL^Pi
xR=F(xL)^xR
交换xL和xR(最后一轮取消该运算)
xR=xR^P17
xL=xL^P18
重新合并xL和xR
函数F见下图:
8位 32位
|-----------S盒1-----------
| |加
| 8位 32位 |----
|-----------S盒2----------- |
| |
| |异或----
32位-| | |
| 8位 32位 | |
|-----------S盒3--------------- |加
| |-----------------32位
| |
| |
| 8位 32位 |
|-----------S盒4-----------------------
把xL分成4个8位分组:a,b,c和d
输出为：F(xL)=((((S[1,a]+S[2,b])MOD 4294967296)^s[3,c])+S[4,d])MOD 4294967296
(2的32次方) (2的32次方)
重新合并后输出的结果就是我们需要的密文。
用BlowFish算法解密，同样也需要两个过程。
1.密钥预处理
2.信息解密
密钥预处理的过程与加密时完全相同
信息解密的过程就是把信息加密过程的key_pbox逆序使用即可。
可以看出，选择不同的key，用BlowFish算法加密同样的信息，可以得出不同的结果。
要破解BlowFish算法，就是要得到BlowFish算法的key。所以，使用BlowFish算法进行加密，最重要的也就是key的选择以及key的保密。其中key的选择可以使用bf_sdk中的_WeakKey函数进行检验。以下是该函数的说明：
源文：
---------------------------------------------------------------------------------------
_WeakKey
Function : Test if the generated Boxes are weak
Argument : none
Return : AX = Status (1=weak, 0=good)
Affects : AX, BX, CX, DX, SI, DI, direction Flag
Description: After "_InitCrypt" you should test the Boxes with this function.
If they provide a weakness which a cryptoanalyst could use to
break the cipher a "1" is returned. In this case you should
reload the original boxes and let the user choose a different
password.
---------------------------------------------------------------------------------------
译文：
---------------------------------------------------------------------------------------
_WeakKey
功能：测试产生的box是否安全
参数：无
返回：AX=1 不安全；AX=0 安全
影响：AX, BX, CX, DX, SI, DI, 方向标志
描述：使用"_InitCrypt"函数产生用于加密的Boxes后，你应该用这个函数测试产生的Boxes是否安全。如果该key产生的Boxes不安全——可以被密码分析者通过分析Boxes得到key，那么，你应该采用另外一个key产生一个安全的Boxes用来加密。
---------------------------------------------------------------------------------------
二、BlowFish's CrackMe1分析
由于该CrackMe主要是测试你的密码学知识，所以没有在其他方面设关卡。为了减小文件体积，缩短大家下载的时间，用upx加了壳，直接用Trw2000的"PNewSec+Makepe"很方便地就能脱掉壳。
用常规的方法，很快找到下面关键比较处：
:004015D9 51 push ecx
:004015DA 52 push edx
:004015DB 6880894000 push 00408980
:004015E0 E8EBFAFFFF call 004010D0 //BF_De(sn)
:004015E5 8B442464 mov eax, dword ptr [esp+64]
:004015E9 8B0DF0994000 mov ecx, dword ptr [004099F0]
:004015EF 83C41C add esp, 0000001C
:004015F2 3BC1 cmp eax, ecx //比较
:004015F4 7529 jne 0040161F
:004015F6 8B4C244C mov ecx, dword ptr [esp+4C]
:004015FA A1EC994000 mov eax, dword ptr [004099EC]
:004015FF 3BC8 cmp ecx, eax //比较
:00401601 751C jne 0040161F
:00401603 6A30 push 00000030
由于BlowFish算法加密，解密输出的信息都是64Bit的，所以要进行两次比较。
我们既然知道了他对我们的sn进行的变换是BF_De，那么，很显然，我们要找到程序初始化key_pbox和key_sbox的地方。跟进4015E0的Call，找到key_pbox在408980处，下bpm，然后跟踪，分析，找到程序初始化key_pbox和key_sbox的地方，如下：
:004016C0 50 push eax
* Possible StringData Ref from Data Obj ->"CrackingForFun"
|
:004016C1 6844804000 push 00408044
:004016C6 6880894000 push 00408980
:004016CB E860FAFFFF call 00401130 //初始化Boxes
由此我们知道了BF_De(sn)的key是"CrackingForFun"。
问题的一半已经解决了。下面我们来看用来比较的另外的64Bit的数是从何而来。
bpm 4099EC w
跟踪分析后，发现这个用来比较的数是由BF_En(ComputerID,key="ChinaCrackingGroup")生成。
至此，我们可以写出注册机的算法：
sn=BF_En((BF_En(ComputerID,key="ChinaCrackingGroup"),key="CrackingForFun")
只要你编程够强，密码学也还过得去，写出这个东西的注册机就不是困难的事情了。
附：
ComputerID的产生
如果你对这个CrackMe很有兴趣，还想研究一下他的ComputerID是如何产生的，也可以继续跟踪，分析，在这里，我给处我分析的结果：
ComputerID=BF_En(0776f6c62h, 068736966h,key=PW_1)
其中，PW_1就是你的Windows版本号，可以在“系统属性”里头看到，也就是注册表中的
H_L_M\Software\Microsoft\Windows\CurrentVersion 中的ProductId项。在我的机器上是：
"25001-OEM-0080247-46673"
注册机源码里头有一些语句没有派上用场，用“;”屏蔽了，如果你有兴趣，可以把前面的;号去掉然后把.data段里头的PW_1换成你机器的ComputerID,再按照程序中的说明自己修改一下源程序，用Masm32V6重新编译，直接按Generate，也能得到正确的序列号。
三、注册机源码
;BlowFish's Crackme's KeyGen Writen By 夜月[CCG]
;Any Questions,Please E-Mail To luoyi.ly@yeah.net
;Thancks To Garfield,BlowFish,Toye
;软件流程：
;1.GetVersion得到机器Windows版本号。PW_1
;2.固定字符串"ChinaCrackingGroup"。PW_2
;3.固定字符串"CrackingForFun"。PW_3
;4.你输入的字符串。sn
;BF_En(0776f6c62h, 068736966h,key=PW_1)得到Computer ID
;BF_En(ComputerID,key=PW_2)得到MagicNum
;IF(BF_De(sn,key=PW_3)==MagicNum) Then Registed OK!
.386
.model flat,stdcall
option casemap:none
include windows.inc
include user32.inc
include kernel32.inc
include comctl32.inc
include comdlg32.inc
include masm32.inc
includelib masm32.lib
includelib user32.lib
includelib kernel32.lib
includelib comctl32.lib
includelib comdlg32.lib
DLG_MAIN equ 100
IDGEN equ 10
Edit1 equ 11
Edit2 equ 12
len_PW_1 equ offset data1_p - offset PW_1
_ProcDlgMain PROTO :DWORD,:DWORD,:DWORD,:DWORD
_Math PROTO :DWORD,:DWORD,:DWORD
BlowFish_En PROTO :DWORD,:DWORD
BlowFish_Fun PROTO :DWORD
BlowFish_Init PROTO :DWORD,:DWORD
.data?
hInstance dd ?
.data
;如果你直接用ComputerID产生序列号，你应该把PW_1换成你自己机器的Windows版本号
;PW_1 db "25001-OEM-0080247-46673"
PW_2 db "ChinaCrackingGroup"
PW_3 db "CrackingForFun"
szID db 20 dup(0)
szText db 9 dup(0)
data1_p dd 0776f6c62h, 068736966h
key dd 1058 dup (0)
BFLOW dd 0
BFHIGH dd 0
MYBFLOW DD 0
MYBFHIGH DD 0
pbox dd 0243f6a88h, 085a308d3h, 013198a2eh, 003707344h, 0a4093822h, 0299f31d0h
dd 0082efa98h, 0ec4e6c89h, 0452821e6h, 038d01377h, 0be5466cfh, 034e90c6ch
dd 0c0ac29b7h, 0c97c50ddh, 03f84d5b5h, 0b5470917h, 09216d5d9h, 08979fb1bh
sbox1 dd 0d1310ba6h, 098dfb5ach, 02ffd72dbh, 0d01adfb7h, 0b8e1afedh, 06a267e96h
dd 0ba7c9045h, 0f12c7f99h, 024a19947h, 0b3916cf7h, 00801f2e2h, 0858efc16h
dd 0636920d8h, 071574e69h, 0a458fea3h, 0f4933d7eh, 00d95748fh, 0728eb658h
dd 0718bcd58h, 082154aeeh, 07b54a41dh, 0c25a59b5h, 09c30d539h, 02af26013h
dd 0c5d1b023h, 0286085f0h, 0ca417918h, 0b8db38efh, 08e79dcb0h, 0603a180eh
dd 06c9e0e8bh, 0b01e8a3eh, 0d71577c1h, 0bd314b27h, 078af2fdah, 055605c60h
dd 0e65525f3h, 0aa55ab94h, 057489862h, 063e81440h, 055ca396ah, 02aab10b6h
dd 0b4cc5c34h, 01141e8ceh, 0a15486afh, 07c72e993h, 0b3ee1411h, 0636fbc2ah
dd 02ba9c55dh, 0741831f6h, 0ce5c3e16h, 09b87931eh, 0afd6ba33h, 06c24cf5ch
dd 07a325381h, 028958677h, 03b8f4898h, 06b4bb9afh, 0c4bfe81bh, 066282193h
dd 061d809cch, 0fb21a991h, 0487cac60h, 05dec8032h, 0ef845d5dh, 0e98575b1h
dd 0dc262302h, 0eb651b88h, 023893e81h, 0d396acc5h, 00f6d6ff3h, 083f44239h
dd 02e0b4482h, 0a4842004h, 069c8f04ah, 09e1f9b5eh, 021c66842h, 0f6e96c9ah
dd 0670c9c61h, 0abd388f0h, 06a51a0d2h, 0d8542f68h, 0960fa728h, 0ab5133a3h
dd 06eef0b6ch, 0137a3be4h, 0ba3bf050h, 07efb2a98h, 0a1f1651dh, 039af0176h
dd 066ca593eh, 082430e88h, 08cee8619h, 0456f9fb4h, 07d84a5c3h, 03b8b5ebeh
dd 0e06f75d8h, 085c12073h, 0401a449fh, 056c16aa6h, 04ed3aa62h, 0363f7706h
dd 01bfedf72h, 0429b023dh, 037d0d724h, 0d00a1248h, 0db0fead3h, 049f1c09bh
dd 0075372c9h, 080991b7bh, 025d479d8h, 0f6e8def7h, 0e3fe501ah, 0b6794c3bh
dd 0976ce0bdh, 004c006bah, 0c1a94fb6h, 0409f60c4h, 05e5c9ec2h, 0196a2463h
dd 068fb6fafh, 03e6c53b5h, 01339b2ebh, 03b52ec6fh, 06dfc511fh, 09b30952ch
dd 0cc814544h, 0af5ebd09h, 0bee3d004h, 0de334afdh, 0660f2807h, 0192e4bb3h
dd 0c0cba857h, 045c8740fh, 0d20b5f39h, 0b9d3fbdbh, 05579c0bdh, 01a60320ah
dd 0d6a100c6h, 0402c7279h, 0679f25feh, 0fb1fa3cch, 08ea5e9f8h, 0db3222f8h
dd 03c7516dfh, 0fd616b15h, 02f501ec8h, 0ad0552abh, 0323db5fah, 0fd238760h
dd 053317b48h, 03e00df82h, 09e5c57bbh, 0ca6f8ca0h, 01a87562eh, 0df1769dbh
dd 0d542a8f6h, 0287effc3h, 0ac6732c6h, 08c4f5573h, 0695b27b0h, 0bbca58c8h
dd 0e1ffa35dh, 0b8f011a0h, 010fa3d98h, 0fd2183b8h, 04afcb56ch, 02dd1d35bh
dd 09a53e479h, 0b6f84565h, 0d28e49bch, 04bfb9790h, 0e1ddf2dah, 0a4cb7e33h
dd 062fb1341h, 0cee4c6e8h, 0ef20cadah, 036774c01h, 0d07e9efeh, 02bf11fb4h
dd 095dbda4dh, 0ae909198h, 0eaad8e71h, 06b93d5a0h, 0d08ed1d0h, 0afc725e0h
dd 08e3c5b2fh, 08e7594b7h, 08ff6e2fbh, 0f2122b64h, 08888b812h, 0900df01ch
dd 04fad5ea0h, 0688fc31ch, 0d1cff191h, 0b3a8c1adh, 02f2f2218h, 0be0e1777h
dd 0ea752dfeh, 08b021fa1h, 0e5a0cc0fh, 0b56f74e8h, 018acf3d6h, 0ce89e299h
dd 0b4a84fe0h, 0fd13e0b7h, 07cc43b81h, 0d2ada8d9h, 0165fa266h, 080957705h
dd 093cc7314h, 0211a1477h, 0e6ad2065h, 077b5fa86h, 0c75442f5h, 0fb9d35cfh
dd 0ebcdaf0ch, 07b3e89a0h, 0d6411bd3h, 0ae1e7e49h, 000250e2dh, 02071b35eh
dd 0226800bbh, 057b8e0afh, 02464369bh, 0f009b91eh, 05563911dh, 059dfa6aah
dd 078c14389h, 0d95a537fh, 0207d5ba2h, 002e5b9c5h, 083260376h, 06295cfa9h
dd 011c81968h, 04e734a41h, 0b3472dcah, 07b14a94ah, 01b510052h, 09a532915h
dd 0d60f573fh, 0bc9bc6e4h, 02b60a476h, 081e67400h, 008ba6fb5h, 0571be91fh
dd 0f296ec6bh, 02a0dd915h, 0b6636521h, 0e7b9f9b6h, 0ff34052eh, 0c5855664h
dd 053b02d5dh, 0a99f8fa1h, 008ba4799h, 06e85076ah
sbox2 dd 04b7a70e9h, 0b5b32944h
dd 0db75092eh, 0c4192623h, 0ad6ea6b0h, 049a7df7dh, 09cee60b8h, 08fedb266h
dd 0ecaa8c71h, 0699a17ffh, 05664526ch, 0c2b19ee1h, 0193602a5h, 075094c29h
dd 0a0591340h, 0e4183a3eh, 03f54989ah, 05b429d65h, 06b8fe4d6h, 099f73fd6h
dd 0a1d29c07h, 0efe830f5h, 04d2d38e6h, 0f0255dc1h, 04cdd2086h, 08470eb26h
dd 06382e9c6h, 0021ecc5eh, 009686b3fh, 03ebaefc9h, 03c971814h, 06b6a70a1h
dd 0687f3584h, 052a0e286h, 0b79c5305h, 0aa500737h, 03e07841ch, 07fdeae5ch
dd 08e7d44ech, 05716f2b8h, 0b03ada37h, 0f0500c0dh, 0f01c1f04h, 00200b3ffh
dd 0ae0cf51ah, 03cb574b2h, 025837a58h, 0dc0921bdh, 0d19113f9h, 07ca92ff6h
dd 094324773h, 022f54701h, 03ae5e581h, 037c2dadch, 0c8b57634h, 09af3dda7h
dd 0a9446146h, 00fd0030eh, 0ecc8c73eh, 0a4751e41h, 0e238cd99h, 03bea0e2fh
dd 03280bba1h, 0183eb331h, 04e548b38h, 04f6db908h, 06f420d03h, 0f60a04bfh
dd 02cb81290h, 024977c79h, 05679b072h, 0bcaf89afh, 0de9a771fh, 0d9930810h
dd 0b38bae12h, 0dccf3f2eh, 05512721fh, 02e6b7124h, 0501adde6h, 09f84cd87h
dd 07a584718h, 07408da17h, 0bc9f9abch, 0e94b7d8ch, 0ec7aec3ah, 0db851dfah
dd 063094366h, 0c464c3d2h, 0ef1c1847h, 03215d908h, 0dd433b37h, 024c2ba16h
dd 012a14d43h, 02a65c451h, 050940002h, 0133ae4ddh, 071dff89eh, 010314e55h
dd 081ac77d6h, 05f11199bh, 0043556f1h, 0d7a3c76bh, 03c11183bh, 05924a509h
dd 0f28fe6edh, 097f1fbfah, 09ebabf2ch, 01e153c6eh, 086e34570h, 0eae96fb1h
dd 0860e5e0ah, 05a3e2ab3h, 0771fe71ch, 04e3d06fah, 02965dcb9h, 099e71d0fh
dd 0803e89d6h, 05266c825h, 02e4cc978h, 09c10b36ah, 0c6150ebah, 094e2ea78h
dd 0a5fc3c53h, 01e0a2df4h, 0f2f74ea7h, 0361d2b3dh, 01939260fh, 019c27960h
dd 05223a708h, 0f71312b6h, 0ebadfe6eh, 0eac31f66h, 0e3bc4595h, 0a67bc883h
dd 0b17f37d1h, 0018cff28h, 0c332ddefh, 0be6c5aa5h, 065582185h, 068ab9802h
dd 0eecea50fh, 0db2f953bh, 02aef7dadh, 05b6e2f84h, 01521b628h, 029076170h
dd 0ecdd4775h, 0619f1510h, 013cca830h, 0eb61bd96h, 00334fe1eh, 0aa0363cfh
dd 0b5735c90h, 04c70a239h, 0d59e9e0bh, 0cbaade14h, 0eecc86bch, 060622ca7h
dd 09cab5cabh, 0b2f3846eh, 0648b1eafh, 019bdf0cah, 0a02369b9h, 0655abb50h
dd 040685a32h, 03c2ab4b3h, 0319ee9d5h, 0c021b8f7h, 09b540b19h, 0875fa099h
dd 095f7997eh, 0623d7da8h, 0f837889ah, 097e32d77h, 011ed935fh, 016681281h
dd 00e358829h, 0c7e61fd6h, 096dedfa1h, 07858ba99h, 057f584a5h, 01b227263h
dd 09b83c3ffh, 01ac24696h, 0cdb30aebh, 0532e3054h, 08fd948e4h, 06dbc3128h
dd 058ebf2efh, 034c6ffeah, 0fe28ed61h, 0ee7c3c73h, 05d4a14d9h, 0e864b7e3h
dd 042105d14h, 0203e13e0h, 045eee2b6h, 0a3aaabeah, 0db6c4f15h, 0facb4fd0h
dd 0c742f442h, 0ef6abbb5h, 0654f3b1dh, 041cd2105h, 0d81e799eh, 086854dc7h
dd 0e44b476ah, 03d816250h, 0cf62a1f2h, 05b8d2646h, 0fc8883a0h, 0c1c7b6a3h
dd 07f1524c3h, 069cb7492h, 047848a0bh, 05692b285h, 0095bbf00h, 0ad19489dh
dd 01462b174h, 023820e00h, 058428d2ah, 00c55f5eah, 01dadf43eh, 0233f7061h
dd 03372f092h, 08d937e41h, 0d65fecf1h, 06c223bdbh, 07cde3759h, 0cbee7460h
dd 04085f2a7h, 0ce77326eh, 0a6078084h, 019f8509eh, 0e8efd855h, 061d99735h
dd 0a969a7aah, 0c50c06c2h, 05a04abfch, 0800bcadch, 09e447a2eh, 0c3453484h
dd 0fdd56705h, 00e1e9ec9h, 0db73dbd3h, 0105588cdh, 0675fda79h, 0e3674340h
dd 0c5c43465h, 0713e38d8h, 03d28f89eh, 0f16dff20h, 0153e21e7h, 08fb03d4ah
dd 0e6e39f2bh, 0db83adf7h
sbox3 dd 0e93d5a68h, 0948140f7h, 0f64c261ch, 094692934h
dd 0411520f7h, 07602d4f7h, 0bcf46b2eh, 0d4a20068h, 0d4082471h, 03320f46ah
dd 043b7d4b7h, 0500061afh, 01e39f62eh, 097244546h, 014214f74h, 0bf8b8840h
dd 04d95fc1dh, 096b591afh, 070f4ddd3h, 066a02f45h, 0bfbc09ech, 003bd9785h
dd 07fac6dd0h, 031cb8504h, 096eb27b3h, 055fd3941h, 0da2547e6h, 0abca0a9ah
dd 028507825h, 0530429f4h, 00a2c86dah, 0e9b66dfbh, 068dc1462h, 0d7486900h
dd 0680ec0a4h, 027a18deeh, 04f3ffea2h, 0e887ad8ch, 0b58ce006h, 07af4d6b6h
dd 0aace1e7ch, 0d3375fech, 0ce78a399h, 0406b2a42h, 020fe9e35h, 0d9f385b9h
dd 0ee39d7abh, 03b124e8bh, 01dc9faf7h, 04b6d1856h, 026a36631h, 0eae397b2h
dd 03a6efa74h, 0dd5b4332h, 06841e7f7h, 0ca7820fbh, 0fb0af54eh, 0d8feb397h
dd 0454056ach, 0ba489527h, 055533a3ah, 020838d87h, 0fe6ba9b7h, 0d096954bh
dd 055a867bch, 0a1159a58h, 0cca92963h, 099e1db33h, 0a62a4a56h, 03f3125f9h
dd 05ef47e1ch, 09029317ch, 0fdf8e802h, 004272f70h, 080bb155ch, 005282ce3h
dd 095c11548h, 0e4c66d22h, 048c1133fh, 0c70f86dch, 007f9c9eeh, 041041f0fh
dd 0404779a4h, 05d886e17h, 0325f51ebh, 0d59bc0d1h, 0f2bcc18fh, 041113564h
dd 0257b7834h, 0602a9c60h, 0dff8e8a3h, 01f636c1bh, 00e12b4c2h, 002e1329eh
dd 0af664fd1h, 0cad18115h, 06b2395e0h, 0333e92e1h, 03b240b62h, 0eebeb922h
dd 085b2a20eh, 0e6ba0d99h, 0de720c8ch, 02da2f728h, 0d0127845h, 095b794fdh
dd 0647d0862h, 0e7ccf5f0h, 05449a36fh, 0877d48fah, 0c39dfd27h, 0f33e8d1eh
dd 00a476341h, 0992eff74h, 03a6f6eabh, 0f4f8fd37h, 0a812dc60h, 0a1ebddf8h
dd 0991be14ch, 0db6e6b0dh, 0c67b5510h, 06d672c37h, 02765d43bh, 0dcd0e804h
dd 0f1290dc7h, 0cc00ffa3h, 0b5390f92h, 0690fed0bh, 0667b9ffbh, 0cedb7d9ch
dd 0a091cf0bh, 0d9155ea3h, 0bb132f88h, 0515bad24h, 07b9479bfh, 0763bd6ebh
dd 037392eb3h, 0cc115979h, 08026e297h, 0f42e312dh, 06842ada7h, 0c66a2b3bh
dd 012754ccch, 0782ef11ch, 06a124237h, 0b79251e7h, 006a1bbe6h, 04bfb6350h
dd 01a6b1018h, 011caedfah, 03d25bdd8h, 0e2e1c3c9h, 044421659h, 00a121386h
dd 0d90cec6eh, 0d5abea2ah, 064af674eh, 0da86a85fh, 0bebfe988h, 064e4c3feh
dd 09dbc8057h, 0f0f7c086h, 060787bf8h, 06003604dh, 0d1fd8346h, 0f6381fb0h
dd 07745ae04h, 0d736fccch, 083426b33h, 0f01eab71h, 0b0804187h, 03c005e5fh
dd 077a057beh, 0bde8ae24h, 055464299h, 0bf582e61h, 04e58f48fh, 0f2ddfda2h
dd 0f474ef38h, 08789bdc2h, 05366f9c3h, 0c8b38e74h, 0b475f255h, 046fcd9b9h
dd 07aeb2661h, 08b1ddf84h, 0846a0e79h, 0915f95e2h, 0466e598eh, 020b45770h
dd 08cd55591h, 0c902de4ch, 0b90bace1h, 0bb8205d0h, 011a86248h, 07574a99eh
dd 0b77f19b6h, 0e0a9dc09h, 0662d09a1h, 0c4324633h, 0e85a1f02h, 009f0be8ch
dd 04a99a025h, 01d6efe10h, 01ab93d1dh, 00ba5a4dfh, 0a186f20fh, 02868f169h
dd 0dcb7da83h, 0573906feh, 0a1e2ce9bh, 04fcd7f52h, 050115e01h, 0a70683fah
dd 0a002b5c4h, 00de6d027h, 09af88c27h, 0773f8641h, 0c3604c06h, 061a806b5h
dd 0f0177a28h, 0c0f586e0h, 0006058aah, 030dc7d62h, 011e69ed7h, 02338ea63h
dd 053c2dd94h, 0c2c21634h, 0bbcbee56h, 090bcb6deh, 0ebfc7da1h, 0ce591d76h
dd 06f05e409h, 04b7c0188h, 039720a3dh, 07c927c24h, 086e3725fh, 0724d9db9h
dd 01ac15bb4h, 0d39eb8fch, 0ed545578h, 008fca5b5h, 0d83d7cd3h, 04dad0fc4h
dd 01e50ef5eh, 0b161e6f8h, 0a28514d9h, 06c51133ch, 06fd5c7e7h, 056e14ec4h
dd 0362abfceh, 0ddc6c837h, 0d79a3234h, 092638212h, 0670efa8eh, 0406000e0h
sbox4 dd 03a39ce37h, 0d3faf5cfh, 0abc27737h, 05ac52d1bh, 05cb0679eh, 04fa33742h
dd 0d3822740h, 099bc9bbeh, 0d5118e9dh, 0bf0f7315h, 0d62d1c7eh, 0c700c47bh
dd 0b78c1b6bh, 021a19045h, 0b26eb1beh, 06a366eb4h, 05748ab2fh, 0bc946e79h
dd 0c6a376d2h, 06549c2c8h, 0530ff8eeh, 0468dde7dh, 0d5730a1dh, 04cd04dc6h
dd 02939bbdbh, 0a9ba4650h, 0ac9526e8h, 0be5ee304h, 0a1fad5f0h, 06a2d519ah
dd 063ef8ce2h, 09a86ee22h, 0c089c2b8h, 043242ef6h, 0a51e03aah, 09cf2d0a4h
dd 083c061bah, 09be96a4dh, 08fe51550h, 0ba645bd6h, 02826a2f9h, 0a73a3ae1h
dd 04ba99586h, 0ef5562e9h, 0c72fefd3h, 0f752f7dah, 03f046f69h, 077fa0a59h
dd 080e4a915h, 087b08601h, 09b09e6adh, 03b3ee593h, 0e990fd5ah, 09e34d797h
dd 02cf0b7d9h, 0022b8b51h, 096d5ac3ah, 0017da67dh, 0d1cf3ed6h, 07c7d2d28h
dd 01f9f25cfh, 0adf2b89bh, 05ad6b472h, 05a88f54ch, 0e029ac71h, 0e019a5e6h
dd 047b0acfdh, 0ed93fa9bh, 0e8d3c48dh, 0283b57cch, 0f8d56629h, 079132e28h
dd 0785f0191h, 0ed756055h, 0f7960e44h, 0e3d35e8ch, 015056dd4h, 088f46dbah
dd 003a16125h, 00564f0bdh, 0c3eb9e15h, 03c9057a2h, 097271aech, 0a93a072ah
dd 01b3f6d9bh, 01e6321f5h, 0f59c66fbh, 026dcf319h, 07533d928h, 0b155fdf5h
dd 003563482h, 08aba3cbbh, 028517711h, 0c20ad9f8h, 0abcc5167h, 0ccad925fh
dd 04de81751h, 03830dc8eh, 0379d5862h, 09320f991h, 0ea7a90c2h, 0fb3e7bceh
dd 05121ce64h, 0774fbe32h, 0a8b6e37eh, 0c3293d46h, 048de5369h, 06413e680h
dd 0a2ae0810h, 0dd6db224h, 069852dfdh, 009072166h, 0b39a460ah, 06445c0ddh
dd 0586cdecfh, 01c20c8aeh, 05bbef7ddh, 01b588d40h, 0ccd2017fh, 06bb4e3bbh
dd 0dda26a7eh, 03a59ff45h, 03e350a44h, 0bcb4cdd5h, 072eacea8h, 0fa6484bbh
dd 08d6612aeh, 0bf3c6f47h, 0d29be463h, 0542f5d9eh, 0aec2771bh, 0f64e6370h
dd 0740e0d8dh, 0e75b1357h, 0f8721671h, 0af537d5dh, 04040cb08h, 04eb4e2cch
dd 034d2466ah, 00115af84h, 0e1b00428h, 095983a1dh, 006b89fb4h, 0ce6ea048h
dd 06f3f3b82h, 03520ab82h, 0011a1d4bh, 0277227f8h, 0611560b1h, 0e7933fdch
dd 0bb3a792bh, 0344525bdh, 0a08839e1h, 051ce794bh, 02f32c9b7h, 0a01fbac9h
dd 0e01cc87eh, 0bcc7d1f6h, 0cf0111c3h, 0a1e8aac7h, 01a908749h, 0d44fbd9ah
dd 0d0dadecbh, 0d50ada38h, 00339c32ah, 0c6913667h, 08df9317ch, 0e0b12b4fh
dd 0f79e59b7h, 043f5bb3ah, 0f2d519ffh, 027d9459ch, 0bf97222ch, 015e6fc2ah
dd 00f91fc71h, 09b941525h, 0fae59361h, 0ceb69cebh, 0c2a86459h, 012baa8d1h
dd 0b6c1075eh, 0e3056a0ch, 010d25065h, 0cb03a442h, 0e0ec6e0eh, 01698db3bh
dd 04c98a0beh, 03278e964h, 09f1f9532h, 0e0d392dfh, 0d3a0342bh, 08971f21eh
dd 01b0a7441h, 04ba3348ch, 0c5be7120h, 0c37632d8h, 0df359f8dh, 09b992f2eh
dd 0e60b6f47h, 00fe3f11dh, 0e54cda54h, 01edad891h, 0ce6279cfh, 0cd3e7e6fh
dd 01618b166h, 0fd2c1d05h, 0848fd2c5h, 0f6fb2299h, 0f523f357h, 0a6327623h
dd 093a83531h, 056cccd02h, 0acf08162h, 05a75ebb5h, 06e163697h, 088d273cch
dd 0de966292h, 081b949d0h, 04c50901bh, 071c65614h, 0e6c6c7bdh, 0327a140ah
dd 045e1d006h, 0c3f27b9ah, 0c9aa53fdh, 062a80f00h, 0bb25bfe2h, 035bdd2f6h
dd 071126905h, 0b2040222h, 0b6cbcf7ch, 0cd769c2bh, 053113ec0h, 01640e3d3h
dd 038abbd60h, 02547adf0h, 0ba38209ch, 0f746ce76h, 077afa1c5h, 020756060h
dd 085cbfe4eh, 08ae88dd8h, 07aaaf9b0h, 04cf9aa7eh, 01948c25ch, 002fb8a8ch
dd 001c36ae4h, 0d6ebe1f9h, 090d4f869h, 0a65cdea0h, 03f09252dh, 0c208e69fh
dd 0b74e6132h, 0ce77e25bh, 0578fdfe3h, 03ac372e6h
.code
;s盒变换函数
BlowFish_Fun proc uses ebx edi esi edx ecx,BfNum:DWORD
MOV ECX,BfNum
MOV AL,CL
AND EAX,0FFh
SHR ECX,08
MOV EDX,EAX
MOV AL,CL
MOV EDI,offset key
AND EAX,0FFh
SHR ECX,08
MOV ESI,EAX
MOV EAX,ECX
SHR EAX,08
AND EAX,0FFh
AND ECX,0FFh
AND ESI,0FFFFh
AND EDX,0FFFFh
MOV EAX,[EDI+EAX*4+48h]
MOV EBX,[EDI+ECX*4+0448h]
MOV ECX,[EDI+ESI*4+0848h]
ADD EAX,EBX
XOR EAX,ECX
MOV ECX,[EDI+EDX*4+0C48h]
ADD EAX,ECX
RET
BlowFish_Fun endp
;BlowFish加密算法函数
BlowFish_En proc uses ebx edi esi edx ecx,highbf:DWORD,lowbf:DWORD
LOCAL num :DWORD
MOV EAX,highbf
MOV ECX,lowbf
MOV EAX,[EAX]
MOV ESI,[ECX]
MOV EDI,offset key
MOV num,10h
MOV EBX,EDI
loc_40108E:
XOR EAX,[EBX]
MOV EDX,EAX
invoke BlowFish_Fun,EAX
MOV ECX,num
XOR EAX,ESI
ADD EBX,4
DEC ECX
MOV ESI,EDX
MOV num,ECX
JNZ loc_40108E
MOV ECX,[EDI+40h]
MOV EDX,[EDI+44h]
XOR ECX,EAX
XOR EDX,ESI
MOV [BFHIGH],EDX
MOV [BFLOW],ECX
RET
BlowFish_En endp
;BlowFish初始化函数
BlowFish_Init proc uses ebx edi esi edx ecx,PWD:DWORD,len_PWD:DWORD
LOCAL pbox_num18:DWORD
LOCAL pbox_num4 :DWORD
LOCAL snum :DWORD
;初始化s盒
MOV ESI,offset key
MOV EAX,offset sbox1
LEA ECX,[ESI+48h]
loc_401141:
MOV EDX,0100h
loc_401146:
MOV EDI,[EAX]
ADD EAX,4
MOV [ECX],EDI
ADD ECX,4
DEC EDX
JNZ loc_401146
CMP EAX,offset sbox1+1000h
JL loc_401141
;初始化p盒
;第一步：原p盒与PWD逐项异或
MOV EDX,PWD
MOV EDI,offset pbox
XOR EAX,EAX
SUB EDI,ESI
MOV pbox_num18,12h
loc_401173:
XOR ECX,ECX
MOV pbox_num4,04
loc_40117D:
XOR EBX,EBX
MOV BL,[EAX+EDX]
SHL ECX,08
OR ECX,EBX
INC EAX
CMP EAX,len_PWD
JL loc_40118E
XOR EAX,EAX
loc_40118E:
MOV EBX,pbox_num4
DEC EBX
MOV pbox_num4,EBX
JNZ loc_40117D
MOV EBX,[EDI+ESI]
ADD ESI,4
XOR EBX,ECX
MOV ECX,pbox_num18
MOV [ESI-04],EBX
DEC ECX
MOV pbox_num18,ECX
JNZ loc_401173
;用连续的blowfish算法填充p盒
MOV EBX,offset key
XOR EAX,EAX
MOV BFLOW,EAX
MOV BFHIGH,EAX
MOV ESI,EBX
MOV EDI,09
loc_4011C4:
LEA EAX,BFLOW
LEA ECX,BFHIGH
invoke BlowFish_En,ECX,EAX
MOV EAX,BFHIGH
MOV ECX,BFLOW
MOV [ESI],EAX
MOV [ESI+04],ECX
ADD ESI,8
DEC EDI
JNZ loc_4011C4
;用连续的blowfish算法填充s盒
LEA ESI,[EBX+4Ch]
MOV snum,04 ;4个s盒。
loc_4011F2:
MOV EDI,80H ;每个盒填充80h=128次（每次填充两个数）。
loc_4011F7:
LEA ECX,BFLOW
LEA EDX,BFHIGH
invoke BlowFish_En,EDX,ECX
MOV ECX,BFHIGH
MOV EDX,BFLOW
MOV [ESI-04],ECX
MOV [ESI],EDX
ADD ESI,8
DEC EDI
JNZ loc_4011F7
DEC snum
JNZ loc_4011F2
RET
BlowFish_Init endp
;消息处理函数
_ProcDlgMain proc uses ebx edi esi edx ecx,hWnd:DWORD,wMsg:DWORD,wParam:DWORD,lParam:DWORD
mov eax,wMsg
.if eax==WM_CLOSE
invoke EndDialog,hWnd,NULL
.elseif eax==WM_COMMAND
mov eax,wParam
and eax,0ffffh
.if eax==IDGEN
;如果你直接用ComputerID产生序列号，从这里到mov MYBFLOW,ebx一段应该屏蔽
invoke GetDlgItemText,hWnd,Edit1,offset szID,17
xor ebx,ebx
xor eax,eax
mov esi,offset szID
mov ecx,8
@@33:
or ebx,eax
xor eax,eax
lodsb
cmp eax,39h
jle @@3
sub eax,7
@@3:
sub eax,30h
shl ebx,4
loop @@33
or ebx,eax
mov MYBFHIGH,ebx
mov esi,offset szID+8
mov ecx,8
xor eax,eax
xor ebx,ebx
@@44:
or ebx,eax
lodsb
cmp eax,39h
jle @@4
sub eax,7
@@4:
sub eax,30h
shl ebx,4
loop @@44
or ebx,eax
mov MYBFLOW,ebx
;…………………………………………………………………………………………………………
;如果你直接用ComputerID产生序列号，这里后面的所有语句你都应将其激活
; invoke BlowFish_Init,offset PW_1,23
; invoke BlowFish_En,offset data1_p,offset data1_p+4
; MOV EAX,BFHIGH
; MOV MYBFHIGH,EAX
; MOV EAX,BFLOW
; MOV MYBFLOW,EAX
invoke BlowFish_Init,offset PW_2,18
invoke BlowFish_En,offset MYBFHIGH,offset MYBFLOW
MOV EAX,BFHIGH
MOV MYBFHIGH,EAX
MOV EAX,BFLOW
MOV MYBFLOW,EAX
invoke BlowFish_Init,offset PW_3,14
invoke BlowFish_En,offset MYBFHIGH,offset MYBFLOW
mov ebx,BFHIGH
mov eax,ebx
mov edi,offset szText
mov ecx,8
@@12:
mov eax,ebx
shl ebx,4
shr eax,28
cmp eax,9
jle @@11
add eax,7
@@11: add eax,30h
and eax,0ffh
stosb
loop @@12
mov ebx,BFLOW
mov eax,ebx
mov edi,offset szText+8
mov ecx,8
@@22:
mov eax,ebx
shl ebx,4
shr eax,28
cmp eax,9
jle @@21
add eax,7
@@21: add eax,30h
and eax,0ffh
stosb
loop @@22
xor eax,eax
mov [edi],eax
invoke SetDlgItemText,hWnd,Edit2,offset szText
mov eax,FALSE
ret
.elseif eax==IDCLOSE
invoke EndDialog,hWnd,NULL
.endif
.else
mov eax,FALSE
ret
.endif
mov eax,TRUE
ret
_ProcDlgMain endp
;主程序
start:
invoke InitCommonControls
invoke GetModuleHandle,NULL
mov hInstance,eax
invoke DialogBoxParam,hInstance,DLG_MAIN,NULL,offset _ProcDlgMain,0
invoke ExitProcess,NULL
end start
end
;资源文件：rsrc.rc
;#include <Resource.h>
;#define IDGEN 10
;#define DLG_MAIN 100
;#define EDIT1 11
;#define EDIT2 12
;
;DLG_MAIN DIALOGEX 100,150,250,60
;STYLE DS_MODALFRAME|WS_POPUP|WS_VISIBLE|WS_CAPTION|WS_SYSMENU|WS_THICKFRAME
;CAPTION "BlowFish's CrackMe KenGen By 夜月[CCG] "
;FONT 9,"宋体"
;
;BEGIN
;CONTROL " ID:",-1,"Static",SS_LEFT,10,13,40,17
;CONTROL "SN:" ,-2,"Static",SS_CENTER,10,40,20,17
;CONTROL "" ,11,"Edit",ES_LEFT,30,13,150,10
;CONTROL "" ,12,"Edit",ES_LEFT,30,40,150,10
;CONTROL "GENERATE",IDGEN,"BUTTON",BS_PUSHBUTTON,200,11,40,15
;CONTROL "EXIT",IDCLOSE,"BUTTON",BS_PUSHBUTTON,200,36,41,14
;END
标 题:BlowFish's CrackMe1 算法分析，以前夜月写过 (18千字)
发信人:DiKeN
时 间:2002-4-11 13:53:00
详细信息:
=========================================================
=
= BlowFish's CrackMe1 验证算法分析
= DiKeN/OCG
=========================================================
* Possible Reference to Dialog: DialogID_0065, CONTROL_ID:03EB, ""
|
:004015A4 68EB030000 push 000003EB
:004015A9 56 push esi
* Reference To: USER32.GetDlgItemTextA, Ord:0000h
|
:004015AA FF151C614000 Call dword ptr [0040611C]
:004015B0 85C0 test eax, eax
:004015B2 0F8432010000 je 004016EA
:004015B8 8D4C244C lea ecx, dword ptr [esp+4C]
:004015BC 8D542448 lea edx, dword ptr [esp+48]
:004015C0 51 push ecx
:004015C1 52 push edx
:004015C2 8D44240C lea eax, dword ptr [esp+0C]
* Possible StringData Ref from Data Obj ->"%08lX%08lX"
|
:004015C6 686C804000 push 0040806C
:004015CB 50 push eax
:004015CC E81F020000 call 004017F0
:004015D1 8D4C245C lea ecx, dword ptr [esp+5C]
:004015D5 8D542458 lea edx, dword ptr [esp+58]
:004015D9 51 push ecx=========>[ecx]=0x90ABCDEF=xr
:004015DA 52 push edx=========>[edx]=0x12345678=xl
:004015DB 6880894000 push 00408980====>P-Box(密钥盒)
:004015E0 E8EBFAFFFF call 004010D0====>计算Blowfish_Dec(long *xl,long *xr)
======================================BF_Dec过程分析============================
:004010D0 8B442408 mov eax, dword ptr [esp+08]
:004010D4 8B4C240C mov ecx, dword ptr [esp+0C]
:004010D8 53 push ebx
:004010D9 55 push ebp
:004010DA 8B00 mov eax, dword ptr [eax]====>xl
:004010DC 56 push esi
:004010DD 8B31 mov esi, dword ptr [ecx]====>xr
:004010DF 57 push edi
:004010E0 8B7C2414 mov edi, dword ptr [esp+14]
:004010E4 C744241410000000 mov [esp+14], 00000010
:004010EC 8D5F44 lea ebx, dword ptr [edi+44]==>P-Box(FORM 18 to 1<==因此使用的Dec)
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040110D(C)
|
:004010EF 3303 xor eax, dword ptr [ebx]
:004010F1 50 push eax
:004010F2 57 push edi
:004010F3 8BE8 mov ebp, eax
:004010F5 E806FFFFFF call 00401000
================================================================================
================================函数F(xl)
================================================================================
:00401000 8B4C2408 mov ecx, dword ptr [esp+08]
:00401004 53 push ebx
:00401005 8AC1 mov al, cl
:00401007 56 push esi
:00401008 25FF000000 and eax, 000000FF
:0040100D 57 push edi
:0040100E C1E908 shr ecx, 08
:00401011 8BD0 mov edx, eax
:00401013 8AC1 mov al, cl
:00401015 8B7C2410 mov edi, dword ptr [esp+10]
:00401019 25FF000000 and eax, 000000FF
:0040101E C1E908 shr ecx, 08
:00401021 8BF0 mov esi, eax
:00401023 8BC1 mov eax, ecx
:00401025 C1E808 shr eax, 08
:00401028 25FF000000 and eax, 000000FF
:0040102D 81E1FF000000 and ecx, 000000FF
:00401033 81E6FFFF0000 and esi, 0000FFFF
:00401039 81E2FFFF0000 and edx, 0000FFFF
:0040103F 8B448748 mov eax, dword ptr [edi+4*eax+48]
:00401043 8B9C8F48040000 mov ebx, dword ptr [edi+4*ecx+00000448]
:0040104A 8B8CB748080000 mov ecx, dword ptr [edi+4*esi+00000848]
:00401051 03C3 add eax, ebx
:00401053 33C1 xor eax, ecx
:00401055 8B8C97480C0000 mov ecx, dword ptr [edi+4*edx+00000C48]
:0040105C 5F pop edi
:0040105D 5E pop esi
:0040105E 03C1 add eax, ecx
:00401060 5B pop ebx
:00401061 C3 ret
================================================================================
================================end 函数F(xl)
================================================================================
:004010FA 8B4C241C mov ecx, dword ptr [esp+1C]
:004010FE 83C408 add esp, 00000008
:00401101 33C6 xor eax, esi
:00401103 83EB04 sub ebx, 00000004
:00401106 49 dec ecx
:00401107 8BF5 mov esi, ebp
:00401109 894C2414 mov dword ptr [esp+14], ecx
:0040110D 75E0 jne 004010EF
:0040110F 8B4F04 mov ecx, dword ptr [edi+04]
:00401112 8B17 mov edx, dword ptr [edi]
:00401114 33C8 xor ecx, eax
:00401116 8B442418 mov eax, dword ptr [esp+18]
:0040111A 33D6 xor edx, esi
:0040111C 5F pop edi
:0040111D 8910 mov dword ptr [eax], edx
:0040111F 8B542418 mov edx, dword ptr [esp+18]
:00401123 5E pop esi
:00401124 5D pop ebp
:00401125 890A mov dword ptr [edx], ecx
:00401127 5B pop ebx
:00401128 C3 ret
=========================BF_Dec过程分析完毕====================================
:004015E5 8B442464 mov eax, dword ptr [esp+64]
:004015E9 8B0DF0994000 mov ecx, dword ptr [004099F0]
:004015EF 83C41C add esp, 0000001C
:004015F2 3BC1 cmp eax, ecx=============>
:004015F4 7529 jne 0040161F
:004015F6 8B4C244C mov ecx, dword ptr [esp+4C]
:004015FA A1EC994000 mov eax, dword ptr [004099EC]=======>我们的找到这个数据的来源，
======================================================================>我们定义为Yl,Yr
==========================================================>我们定义输入的注册码为Ml,Mr
==============================================>即有Blowfish_Dec(Ml,Mr)=Yl,Yr
==============================================>所以Blowfish_Enc(Yl,Yr)=Ml,Mr
==========================================================>我们还需要key
:004015FF 3BC8 cmp ecx, eax=============>两次比较
:00401601 751C jne 0040161F
:00401603 6A30 push 00000030
...........
刚分析了BF_Dec过程，再来分析一个Enc过程：
======================================================================
其实BF_Enc过程与BF_Dec完全一样，只是使用P-Box顺序到过来了
======================================================================
:00401070 8B442408 mov eax, dword ptr [esp+08]
:00401074 8B4C240C mov ecx, dword ptr [esp+0C]
:00401078 53 push ebx
:00401079 55 push ebp
:0040107A 8B00 mov eax, dword ptr [eax]
:0040107C 56 push esi
:0040107D 8B31 mov esi, dword ptr [ecx]
:0040107F 57 push edi
:00401080 8B7C2414 mov edi, dword ptr [esp+14]
:00401084 C744241410000000 mov [esp+14], 00000010
:0040108C 8BDF mov ebx, edi
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:004010AC(C)
|
:0040108E 3303 xor eax, dword ptr [ebx]
:00401090 50 push eax
:00401091 57 push edi
:00401092 8BE8 mov ebp, eax
:00401094 E867FFFFFF call 00401000<=========函数F(xl)，参见上面的分析
:00401099 8B4C241C mov ecx, dword ptr [esp+1C]
:0040109D 83C408 add esp, 00000008
:004010A0 33C6 xor eax, esi
:004010A2 83C304 add ebx, 00000004
:004010A5 49 dec ecx
:004010A6 8BF5 mov esi, ebp
:004010A8 894C2414 mov dword ptr [esp+14], ecx
:004010AC 75E0 jne 0040108E
:004010AE 8B4F40 mov ecx, dword ptr [edi+40]
:004010B1 8B5744 mov edx, dword ptr [edi+44]
:004010B4 33C8 xor ecx, eax
:004010B6 8B442418 mov eax, dword ptr [esp+18]
:004010BA 33D6 xor edx, esi
:004010BC 5F pop edi
:004010BD 8910 mov dword ptr [eax], edx
:004010BF 8B542418 mov edx, dword ptr [esp+18]
:004010C3 5E pop esi
:004010C4 5D pop ebp
:004010C5 890A mov dword ptr [edx], ecx
:004010C7 5B pop ebx
:004010C8 C3 ret
========================BF_Enc分析完毕================================
最后再来一个Init_Key的过程分析:
======================================================================
:00401130 51 push ecx
:00401131 53 push ebx
:00401132 55 push ebp
:00401133 56 push esi
:00401134 8B742414 mov esi, dword ptr [esp+14]
:00401138 57 push edi
:00401139 B898614000 mov eax, 00406198
:0040113E 8D4E48 lea ecx, dword ptr [esi+48]
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:00401158(C)
|
:00401141 BA00010000 mov edx, 00000100
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:00401151(C)
|
:00401146 8B38 mov edi, dword ptr [eax]==========>S-Box
:00401148 83C004 add eax, 00000004
:0040114B 8939 mov dword ptr [ecx], edi
:0040114D 83C104 add ecx, 00000004
:00401150 4A dec edx
:00401151 75F3 jne 00401146
:00401153 3D98714000 cmp eax, 00407198
:00401158 7CE7 jl 00401141
:0040115A 8B6C2420 mov ebp, dword ptr [esp+20]
:0040115E 8B54241C mov edx, dword ptr [esp+1C]
:00401162 BF50614000 mov edi, 00406150
:00401167 33C0 xor eax, eax
:00401169 2BFE sub edi, esi
:0040116B C744241012000000 mov [esp+10], 00000012
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:004011AD(C)
|
:00401173 33C9 xor ecx, ecx
:00401175 C744242004000000 mov [esp+20], 00000004
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:00401197(C)
|
:0040117D 33DB xor ebx, ebx
:0040117F 8A1C10 mov bl, byte ptr [eax+edx]
:00401182 C1E108 shl ecx, 08
:00401185 0BCB or ecx, ebx
:00401187 40 inc eax
:00401188 3BC5 cmp eax, ebp
:0040118A 7C02 jl 0040118E
:0040118C 33C0 xor eax, eax
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040118A(C)
|
:0040118E 8B5C2420 mov ebx, dword ptr [esp+20]
:00401192 4B dec ebx
:00401193 895C2420 mov dword ptr [esp+20], ebx
:00401197 75E4 jne 0040117D
:00401199 8B1C37 mov ebx, dword ptr [edi+esi]
:0040119C 83C604 add esi, 00000004
:0040119F 33D9 xor ebx, ecx
:004011A1 8B4C2410 mov ecx, dword ptr [esp+10]
:004011A5 895EFC mov dword ptr [esi-04], ebx
:004011A8 49 dec ecx
:004011A9 894C2410 mov dword ptr [esp+10], ecx
:004011AD 75C4 jne 00401173
:004011AF 8B5C2418 mov ebx, dword ptr [esp+18]
:004011B3 33C0 xor eax, eax
:004011B5 89442420 mov dword ptr [esp+20], eax
:004011B9 8944241C mov dword ptr [esp+1C], eax
:004011BD 8BF3 mov esi, ebx
:004011BF BF09000000 mov edi, 00000009
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:004011E8(C)
|
:004011C4 8D44241C lea eax, dword ptr [esp+1C]
:004011C8 8D4C2420 lea ecx, dword ptr [esp+20]
:004011CC 50 push eax
:004011CD 51 push ecx
:004011CE 53 push ebx
:004011CF E89CFEFFFF call 00401070================>BF_Enc(0,0,key)
:004011D4 8B54242C mov edx, dword ptr [esp+2C]
:004011D8 8B442428 mov eax, dword ptr [esp+28]
:004011DC 8916 mov dword ptr [esi], edx
:004011DE 894604 mov dword ptr [esi+04], eax
:004011E1 83C40C add esp, 0000000C
:004011E4 83C608 add esi, 00000008
:004011E7 4F dec edi
:004011E8 75DA jne 004011C4
:004011EA 8D734C lea esi, dword ptr [ebx+4C]
:004011ED BD04000000 mov ebp, 00000004
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040121E(C)
|
:004011F2 BF80000000 mov edi, 00000080
* Referenced by a (U)nconditional or (C)onditional Jump at Address:
|:0040121B(C)
|
:004011F7 8D4C241C lea ecx, dword ptr [esp+1C]
:004011FB 8D542420 lea edx, dword ptr [esp+20]
:004011FF 51 push ecx
:00401200 52 push edx
:00401201 53 push ebx
:00401202 E869FEFFFF call 00401070================>BF_Enc(xl,xr,key)
:00401207 8B44242C mov eax, dword ptr [esp+2C]
:0040120B 8B4C2428 mov ecx, dword ptr [esp+28]
:0040120F 8946FC mov dword ptr [esi-04], eax
:00401212 890E mov dword ptr [esi], ecx
:00401214 83C40C add esp, 0000000C
:00401217 83C608 add esi, 00000008
:0040121A 4F dec edi
:0040121B 75DA jne 004011F7
:0040121D 4D dec ebp
:0040121E 75D2 jne 004011F2
:00401220 5F pop edi
:00401221 5E pop esi
:00401222 5D pop ebp
:00401223 5B pop ebx
:00401224 59 pop ecx
:00401225 C3 ret
======================Init_Key过程分析完毕============================ ======================================================================
======================================================================
======================================================================
=============================分析详细总结=============================
======================================================================
======================================================================
=====>BF_Enc(ComputerID,key="ChinaCrackingGroup");
* Possible StringData Ref from Data Obj ->"ChinaCrackingGroup"
:00401434 6830804000 push 00408030
:00401439 6880894000 push 00408980
:0040143E E8EDFCFFFF call 00401130===>Init_Key
...........
:00401667 68EC994000 push 004099EC
:0040166C 68F0994000 push 004099F0
:00401671 6880894000 push 00408980
:00401676 E8F5F9FFFF call 00401070===>BF_Enc
=====>BF_Enc(ComputerID,key="ChinaCrackingGroup");
======================================================================
======================================================================
=====>BF_Dec(Code,key="CrackingForFun")
* Possible StringData Ref from Data Obj ->"CrackingForFun"
|
:004016C1 6844804000 push 00408044
:004016C6 6880894000 push 00408980
:004016CB E860FAFFFF call 00401130===>Init_Key
...........
:004015D9 51 push ecx
:004015DA 52 push edx
:004015DB 6880894000 push 00408980
:004015E0 E8EBFAFFFF call 004010D0===>BF_Dec
=====>BF_Dec(Code,key="CrackingForFun")
======================================================================
======================================================================
=====>BF_Enc("blowfish",key=ProductID)
:0040131F 6880894000 push 00408980
:00401324 E807FEFFFF call 00401130===>Init_Key
:00401329 68EC994000 push 004099EC
:0040132E 68F0994000 push 004099F0
:00401333 6880894000 push 00408980
:00401338 C705F0994000626C6F77 mov dword ptr [004099F0], 776F6C62
:00401342 C705EC99400066697368 mov dword ptr [004099EC], 68736966
:0040134C E81FFDFFFF call 00401070===>BF_Enc
=====>BF_Enc("blowfish",key=ProductID)
======================================================================
======================================================================
=====>最后分析结果
ComputerID=BF_Enc("blowfish",key=ProductID)
x=BF_Dec(Code,key="CrackingForFun")
y=BF_Enc(ComputerID,key="ChinaCrackingGroup")
x=y则注册成功；
我们要得到正确的注册码，那么
Code=BF_Enc(x,key="CrackingForFun");
=BF_Enc(y,key="CrackingForFun");
=BF_Enc(BF_Enc(ComputerID,key="ChinaCrackingGroup"),key="CrackingForFun");
如果更进一步，那么
=BF_Enc(BF_Enc(BF_Enc("blowfish",
key=ProductID),
key="ChinaCrackingGroup"),
key="CrackingForFun");
这样我们便可以编写它的keygen了
