114 lines
3.8 KiB
Markdown
114 lines
3.8 KiB
Markdown
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这么抽象的"赛马"游戏
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打死也不会再研究pcode了，这反编译器给的结果全靠猜
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解决方法：
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在程序同目录建立`Reginfo.roo`文件，内容`1x2y-3412+lmn`
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程序会基于此判断是否注册
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细节：
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```vb
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Private Sub Command1_Click() '406474
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'Data Table: 401EC0
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Dim var_138 As Variant
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Dim var_DA As Integer
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Dim var_19C As Variant
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Dim var_18C As Variant
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loc_40610E: var_EC = CVar(Len(Me.txtname.Text)) 'Variant
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loc_406120: var_C4 = CVar(Me.txtname) 'Variant
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loc_40612C: var_A4 = CVar(Me.txtreply) 'Variant
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loc_406130: On Error Goto loc_4063F3
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loc_406145: For var_168 = 1 To Len(global_52): var_FC = var_168 'Variant
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loc_406180: var_D8 = CVar(Val(CStr((Asc(CStr(Mid(global_52, CLng(var_FC), 1))) * 3)))) 'Variant
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loc_4061FE: var_94 = var_94 & Hex(CVar(Val(CStr((var_D8 + CVar(CInt(Val(CStr((Asc(CStr(Mid(var_C4, CLng(var_FC), 1))) * 3)))))))))) 'Variant
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loc_406211: Next var_168 'Variant
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loc_406226: For var_1BC = 1 To Len(var_C4): var_10C = var_1BC 'Variant
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loc_40624D: var_DA = Asc(CStr(Mid(var_C4, CLng(var_EC), 1)))
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loc_406274: var_B4 = var_B4 & Right(var_D8, 2) 'Variant
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loc_406287: var_EC = (var_EC - 1) 'Variant
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loc_40628E: Next var_1BC 'Variant
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loc_4062AD: For var_1C0 = CByte(1) To CByte(Len(var_94)): var_10E = var_1C0 'Byte
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loc_4062DC: If (CVar(Val(CStr((1 + 1)))) > Len(var_B4)) Then
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loc_4062E4: var_EC = 1 'Variant
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loc_4062E8: End If
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loc_406306: var_18C = CVar(var_C8) & Mid(var_94, CLng(var_10E), 1)
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loc_40630A: var_19C = 2
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loc_406327: var_C8 = CStr(var_18C & Mid(var_B4, CLng(var_EC), var_19C))
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loc_406341: var_138 = (var_EC + 1)
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loc_406345: var_EC = var_138 'Variant
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loc_40634C: Next var_1C0 'Byte
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loc_406355: Randomize(var_138)
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loc_40638B: Me.lblquery.Caption = CStr(CVar(Call Proc_2_0_404A90(&H186A0, &HDBBA0)))
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loc_4063A2: If (CVar(var_C8) = var_A4) Then
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loc_4063A5: Call makereg()
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loc_4063B7: Me.Global.Unload Me
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loc_4063E0: MsgBox("Thank you for registering this program, and enjoy. Please restart the game to get full registered use.", &H40, "Registered", var_18C, var_19C)
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loc_4063F0: GoTo loc_406471
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loc_4063F3: ' Referenced from: 406130
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loc_4063F3: End If
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loc_406417: var_138 = CVar("Sorry, the password you entered was incorrect." & vbCrLf & "To buy this program for only £253.27 please contact our sales department via email: quibus_umbra@hotmail.com") 'String
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loc_40641A: MsgBox(var_138, &H10, "Incorrect", var_18C, var_19C)
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loc_406430: Randomize(var_138)
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loc_406466: Me.lblquery.Caption = CStr(CVar(Call Proc_2_0_404A90(&H186A0, &HDBBA0)))
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loc_406471: ' Referenced from: 4063F0
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loc_406471: Exit Sub
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End Sub
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```
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没什么好的思路，所以瞟了瞟x64dbg
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```
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150C05850105C50205150E05F50105E50305150D50705150D05D50 //True Reply
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caonima //Name
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50505050505050 //这个不好说明，看下面代码vd8
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sb //Reply
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1C81C21EF1E31D71DD //不好说没，看下面代码v94
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556342 //随机值，显示在软件窗口上部分label
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```
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得到组合关系后，直接开vs
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```c#
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if(args.Length != 2)
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{
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Console.WriteLine("Usage: sp_keygen.exe <name> <random value>");
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}
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else
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{
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string s1 = args[1];
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string name = args[0];
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string reply = "";
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int length = Math.Min(name.Length, s1.Length);
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int vd8 = 0;
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string vd8s = "";
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string v94 = "";
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for (int i = 0; i < length; i++)
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{
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vd8 = s1[i] * 3;
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int vd9 = name[i] * 3;
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int n = vd8 + vd9;
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v94 += n.ToString("X");
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}
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for (int k = 0; k < name.Length; k++)
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{
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vd8s += vd8.ToString()[^2..];
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}
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for (int i = 0, j = 0; i < v94.Length; i++, j++)
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{
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reply += v94[i].ToString() + vd8s[j] + vd8s[j + 1];
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if (i == vd8s.Length - 2)
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{
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j = -1;
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}
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}
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Console.WriteLine(reply);
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}
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```
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彩蛋：
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我留了一份`Bracing_Patched.exe`赛马无敌版
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