solved new crackme

This commit is contained in:
Chenx221 2024-10-12 12:26:06 +08:00
parent 1ce2c89781
commit f3e0b5aaf4
Signed by: chenx221
GPG Key ID: D7A9EC07024C3021
10 changed files with 294 additions and 0 deletions

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/--------------------------\
|Boylizard's ProtectMe-----|
\--------------------------/
I believe this may be completely new to some of you, so here is a quick description:
In this protect-me, you are to take the keygen and make a serial check for it.
Example -
With this protectme, you are to look at the keygen, and make a program that tells you if the serial is correct or incorrect, just like most programs that ask you to enter a serial.
If you do not understand, wait untill someone makes a solution for this, then run the program.
L8rz folks!

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反向crackme?
一看是vb.net 内心狂喜
先来看一下serial是怎么生成的
```c#
// TextBox1:Name, TextBox2:Serial
private void Button1_Click(object sender, EventArgs e)
{
if (this.TextBox1.Text.Length <= 7)
{
Interaction.MsgBox("Name must be at least 8 chars!!!", MsgBoxStyle.OkOnly, null);
}
else
{
this.lengthofbox = StringType.FromInteger(this.TextBox1.Text.Length);
this.TextBox2.Text = this.lengthofbox + this.TextBox1.Text.Remove(3, 5);
this.TextBox3.Text = this.TextBox2.Text;
this.string2 = StringType.FromDouble(DoubleType.FromString(this.lengthofbox) / (double)this.TextBox3.Text.Length);
this.TextBox2.Text = this.string2 + this.TextBox3.Text;
}
}
```
这样一来就能写出以下检查代码
```c#
static bool ValidateNameSerial(string name, string serial, ref string ErrReason)
{
int length = name.Length;
if (length <= 7)
{
ErrReason = "Name length must be greater than 7";
return false;
}
else
{
string temp2 = length + name.Remove(3, 5);
if ((length / (double)temp2.Length) + temp2 == serial)
return true;
ErrReason = "Wrong Serial";
return false;
}
}
```

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namespace Validator
{
internal class Program
{
static void Main()
{
Console.Write("Please enter a Name: ");
string? name = Console.ReadLine();
if (string.IsNullOrEmpty(name))
Console.WriteLine("Name cannot be empty.");
else
{
Console.Write("Please enter a Serial: ");
string? serial = Console.ReadLine();
string ErrReason = "";
if (ValidateNameSerial(name, serial ?? "", ref ErrReason))
{
Console.ForegroundColor = ConsoleColor.Green;
Console.WriteLine("Passed");
}
else
{
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine("Failed: " + ErrReason);
}
}
Console.ResetColor();
Console.ReadLine();
return;
}
static bool ValidateNameSerial(string name, string serial, ref string ErrReason)
{
int length = name.Length;
if (length <= 7)
{
ErrReason = "Name length must be greater than 7";
return false;
}
else
{
string temp2 = length + name.Remove(3, 5);
if ((length / (double)temp2.Length) + temp2 == serial)
return true;
ErrReason = "Wrong Serial";
return false;
}
}
}
}

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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net8.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
</Project>

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