Screen Demo Maker V3.0注册算法分析
软件名称:Screen Demo Maker V3.0
破解作者:LAJIAOLZ[FCG-CCG-iPB-CCG]
破解日期:2002/09/10
用OLLYDBG载入,查找参考串“Bad Register Code!“找到断点
//////////////////////////////////////////////////////////////////////
00406B44 . 6A 0A PUSH 0A
00406B46 . 8BCA MOV ECX,EDX
00406B48 . E8 CFD50000 CALL
00406B4D . 50 PUSH EAX
00406B4E . 8BCB MOV ECX,EBX
00406B50 . E8 C7D50000 CALL
00406B55 . 50 PUSH EAX
00406B56 . E8 45F5FFFF CALL SDServer.004060A0 //关键调用跟入
00406B5B . 83C4 0C ADD ESP,0C
00406B5E . 85C0 TEST EAX,EAX
00406B60 . 75 14 JNZ SHORT SDServer.00406B76
00406B62 > 6A 00 PUSH 0
00406B64 . 6A 00 PUSH 0
00406B66 . 68 A8F34100 PUSH SDServer.0041F3A8 ; ASCII "Bad Register Code!"
00406B6B . 8BCE MOV ECX,ESI
00406B6D . E8 FCD40000 CALL
00406B72 . 5F POP EDI
00406B73 . 5E POP ESI
00406B74 . 5B POP EBX
00406B75 . C3 RETN
//////////////////////////////////////////////////////////////////////
004060A0 /$ 53 PUSH EBX
004060A1 |. 55 PUSH EBP
004060A2 |. 8B6C24 10 MOV EBP,DWORD PTR SS:[ESP+10]
004060A6 |. 56 PUSH ESI
004060A7 |. 8B7424 10 MOV ESI,DWORD PTR SS:[ESP+10] //指向6位数字序列号 S[0..5]
004060AB |. 57 PUSH EDI
004060AC |. 8BCE MOV ECX,ESI
004060AE |. 8D5D 07 LEA EBX,DWORD PTR SS:[EBP+7]
004060B1 |. C646 06 00 MOV BYTE PTR DS:[ESI+6],0
004060B5 |. 8BC5 MOV EAX,EBP
004060B7 |. 2BCD SUB ECX,EBP
004060B9 |. BF 06000000 MOV EDI,6
004060BE |> 8A1401 /MOV DL,BYTE PTR DS:[ECX+EAX]
004060C1 |. 8810 |MOV BYTE PTR DS:[EAX],DL
004060C3 |. 40 |INC EAX
004060C4 |. 4F |DEC EDI
004060C5 |.^75 F7 \JNZ SHORT SDServer.004060BE
004060C7 |. 8B7C24 1C MOV EDI,DWORD PTR SS:[ESP+1C]
004060CB |. C645 06 2D MOV BYTE PTR SS:[EBP+6],2D
004060CF |. 0FBE4E 03 MOVSX ECX,BYTE PTR DS:[ESI+3]
004060D3 |. 0FBE06 MOVSX EAX,BYTE PTR DS:[ESI]
004060D6 |. 8BD7 MOV EDX,EDI
004060D8 |. 6A 03 PUSH 3 ; /maxlen = 3
004060DA |. 03D1 ADD EDX,ECX ; |
004060DC |. B9 19000000 MOV ECX,19 ; |
004060E1 |. 03C2 ADD EAX,EDX ; |
004060E3 |. C64424 1B 00 MOV BYTE PTR SS:[ESP+1B],0 ; |
004060E8 |. 99 CDQ ; |
004060E9 |. F7F9 IDIV ECX ; |
004060EB |. 0FBE46 01 MOVSX EAX,BYTE PTR DS:[ESI+1] ; |
004060EF |. 8BCF MOV ECX,EDI ; |
004060F1 |. 80C2 41 ADD DL,41 ; |
004060F4 |. 885424 18 MOV BYTE PTR SS:[ESP+18],DL ; |
004060F8 |. 0FBE56 04 MOVSX EDX,BYTE PTR DS:[ESI+4] ; |
004060FC |. 03CA ADD ECX,EDX ; |
004060FE |. 03C1 ADD EAX,ECX ; |
00406100 |. B9 19000000 MOV ECX,19 ; |
00406105 |. 99 CDQ ; |
00406106 |. F7F9 IDIV ECX ; |
00406108 |. 0FBE46 02 MOVSX EAX,BYTE PTR DS:[ESI+2] ; |
0040610C |. 8BCF MOV ECX,EDI ; |
0040610E |. 80C2 41 ADD DL,41 ; |
00406111 |. 885424 19 MOV BYTE PTR SS:[ESP+19],DL ; |
00406115 |. 0FBE56 05 MOVSX EDX,BYTE PTR DS:[ESI+5] ; |
00406119 |. 03CA ADD ECX,EDX ; |
0040611B |. 03C1 ADD EAX,ECX ; |
0040611D |. B9 19000000 MOV ECX,19 ; |
00406122 |. 99 CDQ ; |
00406123 |. F7F9 IDIV ECX ; |
00406125 |. 80C2 41 ADD DL,41 ; |
00406128 |. 885424 1A MOV BYTE PTR SS:[ESP+1A],DL ; |
0040612C |. 8D5424 18 LEA EDX,DWORD PTR SS:[ESP+18] ; |
00406130 |. 52 PUSH EDX ; |src
00406131 |. 53 PUSH EBX ; |dest
00406132 |. 8B1D 8C964100 MOV EBX,DWORD PTR DS:[<&MSVCRT.strncpy>] ; |msvcrt.strncpy
//合并串 S[0..5]+'-'+S1[0..2]
00406138 |. FFD3 CALL EBX ; \strncpy
0040613A |. 0FBE46 03 MOVSX EAX,BYTE PTR DS:[ESI+3]
0040613E |. 0FBE0E MOVSX ECX,BYTE PTR DS:[ESI]
00406141 |. 2BC8 SUB ECX,EAX
00406143 |. 6A 03 PUSH 3
00406145 |. 8D4439 20 LEA EAX,DWORD PTR DS:[ECX+EDI+20]
00406149 |. B9 19000000 MOV ECX,19
0040614E |. 99 CDQ
0040614F |. F7F9 IDIV ECX
00406151 |. 0FBE46 04 MOVSX EAX,BYTE PTR DS:[ESI+4]
00406155 |. 80C2 41 ADD DL,41
00406158 |. 885424 24 MOV BYTE PTR SS:[ESP+24],DL
0040615C |. 0FBE56 01 MOVSX EDX,BYTE PTR DS:[ESI+1]
00406160 |. 2BD0 SUB EDX,EAX
00406162 |. 8D443A 20 LEA EAX,DWORD PTR DS:[EDX+EDI+20]
00406166 |. 99 CDQ
00406167 |. F7F9 IDIV ECX
00406169 |. 0FBE46 05 MOVSX EAX,BYTE PTR DS:[ESI+5]
0040616D |. 80C2 41 ADD DL,41
00406170 |. 885424 25 MOV BYTE PTR SS:[ESP+25],DL
00406174 |. 0FBE56 02 MOVSX EDX,BYTE PTR DS:[ESI+2]
00406178 |. 2BD0 SUB EDX,EAX
0040617A |. 8D443A 20 LEA EAX,DWORD PTR DS:[EDX+EDI+20]
0040617E |. 99 CDQ
0040617F |. F7F9 IDIV ECX
00406181 |. 8D45 0A LEA EAX,DWORD PTR SS:[EBP+A]
00406184 |. 80C2 41 ADD DL,41
00406187 |. 885424 26 MOV BYTE PTR SS:[ESP+26],DL
0040618B |. 8D5424 24 LEA EDX,DWORD PTR SS:[ESP+24]
0040618F |. 52 PUSH EDX
00406190 |. 50 PUSH EAX
00406191 |. FFD3 CALL EBX
//合并串 S[0..5]+'-'+S1[0..2]+S2[0..2]
00406193 |. 0FBE46 03 MOVSX EAX,BYTE PTR DS:[ESI+3]
00406197 |. 0FBE0E MOVSX ECX,BYTE PTR DS:[ESI]
0040619A |. 03C7 ADD EAX,EDI
0040619C |. 33C1 XOR EAX,ECX
0040619E |. B9 19000000 MOV ECX,19
004061A3 |. 99 CDQ
004061A4 |. F7F9 IDIV ECX
004061A6 |. 0FBE46 04 MOVSX EAX,BYTE PTR DS:[ESI+4]
004061AA |. 80C2 41 ADD DL,41
004061AD |. 03C7 ADD EAX,EDI
004061AF |. 885424 2C MOV BYTE PTR SS:[ESP+2C],DL
004061B3 |. 0FBE56 01 MOVSX EDX,BYTE PTR DS:[ESI+1]
004061B7 |. 33C2 XOR EAX,EDX
004061B9 |. 6A 03 PUSH 3
004061BB |. 99 CDQ
004061BC |. F7F9 IDIV ECX
004061BE |. 0FBE46 05 MOVSX EAX,BYTE PTR DS:[ESI+5]
004061C2 |. 03C7 ADD EAX,EDI
004061C4 |. 80C2 41 ADD DL,41
004061C7 |. 885424 31 MOV BYTE PTR SS:[ESP+31],DL
004061CB |. 0FBE56 02 MOVSX EDX,BYTE PTR DS:[ESI+2]
004061CF |. 33C2 XOR EAX,EDX
004061D1 |. 99 CDQ
004061D2 |. F7F9 IDIV ECX
004061D4 |. 8D45 0D LEA EAX,DWORD PTR SS:[EBP+D]
004061D7 |. 80C2 41 ADD DL,41
004061DA |. 885424 32 MOV BYTE PTR SS:[ESP+32],DL
004061DE |. 8D5424 30 LEA EDX,DWORD PTR SS:[ESP+30]
004061E2 |. 52 PUSH EDX
004061E3 |. 50 PUSH EAX
004061E4 |. FFD3 CALL EBX
//合并串 S[0..5]+'-'+S1[0..2]+S2[0..2]+S3[0..2]
004061E6 |. 83C4 24 ADD ESP,24 //EBP=真注册码
004061E9 |. C645 10 00 MOV BYTE PTR SS:[EBP+10],0
004061ED |. B8 01000000 MOV EAX,1
004061F2 |. 5F POP EDI
004061F3 |. 5E POP ESI
004061F4 |. 5D POP EBP
004061F5 |. 5B POP EBX
004061F6 \. C3 RETN
//////////////////////////////////////////////////////////////////////
不难看出算法
用一程序来描述
假定序列号为S[0..5]
计算出来3个子串 S1[0..2] S2[0..2] S3[0..2]
FOR I=0TO 2
S1[I]=((S[I]+S[I+3]+0A) MOD 19)+41
NEXT I
FOR I=0 TO 2
S2[I]=((S[I]+0A+20-S[I+3]) MOD 19)+41
NEXT I
FOR I=0 TO 2
S3[I]=((S[I+3]+0A) XOR S[I]) MOD 19)+41
NEXT I
T[]=S[]+'-'+S1[]+S2[]+S3[]
//////////////////////////////////////////////////////////////////////
软件下载: http://www.stepok.com/sdemo/SD3Setup.exe
注册机下载:http://fcg.5599.net/lajiaolz/ScreenDemoMaker-V3.0-KEYGEN-LAJIAOLZ.rar
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