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

=====>

======================================================================