dnspy

DES Encrypt
key,iv: Encoding.ASCII.GetBytes("ABugger2");
加密结果以base64形式表示

检查Key文本框是否为空
检查DES加密(Key文本)==license文件内容
检查DES加密(license文件路径)=="DIYCtpqJYWygsw1V7MbQdyxPnWMKkR4/"

通过解密可得：
license文件需要放C:\CrackMes\File
其内容为DES加密的key的Base64，key和iv上面写了


private void btnCheck_Click(object sender, EventArgs e)
{
	if (this.open.ShowDialog() == DialogResult.OK)
	{
		string fileName = this.open.FileName;
		try
		{
			string text;
			using (StreamReader streamReader = new StreamReader(fileName))
			{
				text = streamReader.ReadLine();
			}
			if (this.txtName.Text != "" && Form1.EncryptDES(this.txtName.Text) == text && Form1.EncryptDES(fileName) == "DIYCtpqJYWygsw1V7MbQdyxPnWMKkR4/")
			{
				this.lblMode.Text = "Trial mode";
				this.lblMode.ForeColor = Color.Green;
			}
			else
			{
				MessageBox.Show("KeyFile is invalid");
			}
		}
		catch
		{
			MessageBox.Show("I can't open file! :(");
		}
	}
}