BLOWFISH演算法

BLOWFISH演算法

作　者：夜月
聯　系：luoyi_ly1@sina.com
時　間：2001年10月6日
範　例：BlowFish's CrackMe1
序號產生器：Bfkeygen

一、BlowFish演算法說明（文中資料型別以Tc2.0為準）

　　BlowFish演算法用來加密64Bit長度的字串。
  BlowFish演算法使用兩個“盒”――ungigned long pbox[18]和unsigned long sbox[4,256]。
  BlowFish演算法中，有一個核心加密函式:BF_En(後文詳細介紹）。該函式輸入64位資訊，運算後，以64位密文的形式輸出。用BlowFish演算法加密資訊，需要兩個過程：

1.金鑰預處理
2.資訊加密

分別說明如下：
金鑰預處理：
  BlowFish演算法的源金鑰――pbox和sbox是固定的。我們要加密一個資訊，需要自己選擇一個key，用這個key對pbox和sbox進行變換，得到下一步資訊加密所要用的key_pbox和key_sbox。具體的變化演算法如下：

1)用sbox填充key_sbox
2)用自己選擇的key8個一組地去異或pbox，用異或的結果填充key_pbox。key可以迴圈使用。
比如說：選的key是"abcdefghijklmn"。則異或過程為：
key_pbox[0]=pbox[0]^abcdefgh
key_pbox[1]=pbox[1]^ijklmnab
…………
…………
如此迴圈，直到key_box填充完畢。
3)用BF_En加密一個全0的64位資訊，用輸出的結果替換key_pbox[0]和key_pbox[1]。i=0
4)用BF_En加密替換後的key_pbox[i],key_pbox[i+1],用輸出替代key_pbox[i+2]和key_pbox[i+3]
5)i+2，繼續第4步，直到key_pbox全部被替換
6)用key_pbox[16]和key_pbox[17]做首次輸入（相當於上面的全0的輸入），用類似的方法，替換key_sbox 資訊加密。資訊加密就是用函式把待加密資訊x分成32位的兩部分:xL,xR BF_En對輸入資訊進行變換，BF_En函式詳細過程如下：

對於i=1至16
xL=xL^Pi
xR=F(xL)^xR
交換xL和xR(最後一輪取消該運算)
xR=xR^P17
xL=xL^P18
重新合併xL和xR
函式F見下圖:

8位 32位
|-----------S盒1-----------
| |加
| 8位 32位 |----
|-----------S盒2----------- |
| |
| |異或----
32位-| | |
| 8位 32位 | |
|-----------S盒3--------------- |加
| |-----------------32位
| |
| |
| 8位 32位 |
|-----------S盒4-----------------------

把xL分成4個8位分組:a,b,c和d
輸出為：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)
重新合併後輸出的結果就是我們需要的密文。
用BlowFish演算法解密，同樣也需要兩個過程。
1.金鑰預處理
2.資訊解密
  金鑰預處理的過程與加密時完全相同
  資訊解密的過程就是把資訊加密過程的key_pbox逆序使用即可。

  可以看出，選擇不同的key，用BlowFish演算法加密同樣的資訊，可以得出不同的結果。
  要破解BlowFish演算法，就是要得到BlowFish演算法的key。所以，使用BlowFish演算法進行加密，最重要的也就是key的選擇以及key的保密。其中key的選擇可以使用bf_sdk中的_WeakKey函式進行檢驗。以下是該函式的說明：

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.
---------------------------------------------------------------------------------------
譯文：
---------------------------------------------------------------------------------------
_WeakKey
功能：測試產生的box是否安全
引數：無
返回：AX=1 不安全；AX=0 安全
影響：AX, BX, CX, DX, SI, DI, 方向標誌
描述：使用"_InitCrypt"函式產生用於加密的Boxes後，你應該用這個函式測試產生的Boxes是否安全。如果該key產生的Boxes不安全――可以被密碼分析者透過分析Boxes得到key，那麼，你應該採用另外一個key產生一個安全的Boxes用來加密。

---------------------------------------------------------------------------------------

二、BlowFish's CrackMe1分析

由於該CrackMe主要是測試你的密碼學知識，所以沒有在其他方面設關卡。為了減小檔案體積，縮短大家下載的時間，用upx加了殼，直接用Trw2000的"PNewSec+Makepe"很方便地就能脫掉殼。
用常規的方法，很快找到下面關鍵比較處：
: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 //比較
:004015F4 7529 jne 0040161F
:004015F6 8B4C244C mov ecx, dword ptr [esp+4C]
:004015FA A1EC994000 mov eax, dword ptr [004099EC]
:004015FF 3BC8 cmp ecx, eax //比較
:00401601 751C jne 0040161F
:00401603 6A30 push 00000030
由於BlowFish演算法加密，解密輸出的資訊都是64Bit的，所以要進行兩次比較。
我們既然知道了他對我們的sn進行的變換是BF_De，那麼，很顯然，我們要找到程式初始化key_pbox和key_sbox的地方。跟進4015E0的Call，找到key_pbox在408980處，下bpm，然後跟蹤，分析，找到程式初始化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
由此我們知道了BF_De(sn)的key是"CrackingForFun"。
問題的一半已經解決了。下面我們來看用來比較的另外的64Bit的數是從何而來。
  bpm 4099EC w
跟蹤分析後，發現這個用來比較的數是由BF_En(ComputerID,key="ChinaCrackingGroup")生成。
  至此，我們可以寫出序號產生器的演算法：
  sn=BF_En((BF_En(ComputerID,key="ChinaCrackingGroup"),key="CrackingForFun")
  只要你程式設計夠強，密碼學也還過得去，寫出這個東西的序號產生器就不是困難的事情了。
附：
ComputerID的產生
如果你對這個CrackMe很有興趣，還想研究一下他的ComputerID是如何產生的，也可以繼續跟蹤，分析，在這裡，我給處我分析的結果：
ComputerID=BF_En(0776f6c62h, 068736966h,key=PW_1)
  其中，PW_1就是你的Windows版本號，可以在“系統屬性”裡頭看到，也就是登錄檔中的
H_L_M\Software\Microsoft\Windows\CurrentVersion 中的ProductId項。在我的機器上是：
"25001-OEM-0080247-46673"
  序號產生器原始碼裡頭有一些語句沒有派上用場，用“;”遮蔽了，如果你有興趣，可以把前面的;號去掉然後把.data段裡頭的PW_1換成你機器的ComputerID,再按照程式中的說明自己修改一下源程式，用Masm32V6重新編譯，直接按Generate，也能得到正確的序列號。

三、序號產生器原始碼

;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
;軟體流程：
;1.GetVersion得到機器Windows版本號。PW_1
;2.固定字串"ChinaCrackingGroup"。PW_2
;3.固定字串"CrackingForFun"。PW_3
;4.你輸入的字串。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產生序列號，你應該把PW_1換成你自己機器的Windows版本號
;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盒變換函式
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加密演算法函式
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初始化函式
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盒與PWD逐項異或

  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

;用連續的blowfish演算法填充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

;用連續的blowfish演算法填充s盒
  LEA ESI,[EBX+4Ch]
  MOV snum,04       ;4個s盒。
loc_4011F2:
  MOV EDI,80H       ;每個盒填充80h=128次（每次填充兩個數）。
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

;訊息處理函式
_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產生序列號，從這裡到mov MYBFLOW,ebx一段應該遮蔽
      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產生序列號，這裡後面的所有語句你都應將其啟用
;       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

;主程式
start:
invoke InitCommonControls
invoke GetModuleHandle,NULL
mov hInstance,eax
invoke DialogBoxParam,hInstance,DLG_MAIN,NULL,offset _ProcDlgMain,0
invoke ExitProcess,NULL
end start

end

;資原始檔：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,"宋體"
;
;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

標題:BlowFish's CrackMe1 演算法分析，以前夜月寫過 (18千字)
發信人:DiKeN
時間:2002-4-11 13:53:00
詳細資訊:

=========================================================
=
= BlowFish's CrackMe1 驗證演算法分析
= 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(金鑰盒)

:004015E0 E8EBFAFFFF call 004010D0====>計算Blowfish_Dec(long *xl,long *xr)
======================================BF_Dec過程分析============================
: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
================================================================================
================================函式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 函式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過程分析完畢====================================
: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]=======>我們的找到這個資料的來源，
======================================================================>我們定義為Yl,Yr
==========================================================>我們定義輸入的註冊碼為Ml,Mr
==============================================>即有Blowfish_Dec(Ml,Mr)=Yl,Yr
==============================================>所以Blowfish_Enc(Yl,Yr)=Ml,Mr
==========================================================>我們還需要key
:004015FF 3BC8 cmp ecx, eax=============>兩次比較
:00401601 751C jne 0040161F
:00401603 6A30 push 00000030
...........
剛分析了BF_Dec過程，再來分析一個Enc過程：
======================================================================
其實BF_Enc過程與BF_Dec完全一樣，只是使用P-Box順序到過來了
======================================================================
: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<=========函式F(xl)，參見上面的分析
: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分析完畢================================

最後再來一個Init_Key的過程分析:
======================================================================
: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過程分析完畢============================ ======================================================================
======================================================================
======================================================================
=============================分析詳細總結=============================
======================================================================
======================================================================
=====>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)
======================================================================
======================================================================
=====>最後分析結果
ComputerID=BF_Enc("blowfish",key=ProductID)

x=BF_Dec(Code,key="CrackingForFun")
y=BF_Enc(ComputerID,key="ChinaCrackingGroup")
x=y則註冊成功；

我們要得到正確的註冊碼，那麼
Code=BF_Enc(x,key="CrackingForFun");
=BF_Enc(y,key="CrackingForFun");
=BF_Enc(BF_Enc(ComputerID,key="ChinaCrackingGroup"),key="CrackingForFun");
如果更進一步，那麼
=BF_Enc(BF_Enc(BF_Enc("blowfish",
key=ProductID),
key="ChinaCrackingGroup"),
key="CrackingForFun");

這樣我們便可以編寫它的keygen了
=====>
======================================================================

BLOWFISH演算法

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