C#软件license管理（简单软件注册机制）

最近做了一个绿色免安装软件，领导临时要求加个注册机制，不能让现场工程师随意复制。事出突然,只能在现场开发（离开现场软件就不受我们控了）。花了不到两个小时实现了简单的注册机制，稍作整理。
基本原理：1.软件一运行就把计算机的CPU、主板、BIOS、MAC地址记录下来，然后加密（key=key1）生成文件；2.注册机将该文件内容MD5加密后再进行一次加密(key=key2)保存成注册文件；3.注册验证的逻辑，计算机信息加密后（key=key1）加密md5==注册文件解密（key=key2）；
另外，采用ConfuserEx将可执行文件加密；这样别人要破解也就需要点力气了（没打算防破解，本意只想防复制的），有能力破解的人也不在乎破解这个软件了（开发这个软件前后只花了一周时间而已）；

技术上主要三个模块：1.获取电脑相关硬件信息(可参考)；2.加密解密；3.读写文件；

1.获取电脑相关硬件信息代码：

public class ComputerInfo
{
public static string GetComputerInfo()
{
string info = string.Empty;
string cpu = GetCPUInfo();
string baseBoard = GetBaseBoardInfo();
string bios = GetBIOSInfo();
string mac = GetMACInfo();
info = string.Concat(cpu, baseBoard, bios, mac);
return info;
}
private static string GetCPUInfo()
{
string info = string.Empty;
info = GetHardWareInfo("Win32_Processor", "ProcessorId");
return info;
}
private static string GetBIOSInfo()
{
string info = string.Empty;
info = GetHardWareInfo("Win32_BIOS", "SerialNumber");
return info;
}
private static string GetBaseBoardInfo()
{
string info = string.Empty;
info = GetHardWareInfo("Win32_BaseBoard", "SerialNumber");
return info;
}
private static string GetMACInfo()
{
string info = string.Empty;
info = GetHardWareInfo("Win32_BaseBoard", "SerialNumber");
return info;
}
private static string GetHardWareInfo(string typePath, string key)
{
try
{
ManagementClass managementClass = new ManagementClass(typePath);
ManagementObjectCollection mn = managementClass.GetInstances();
PropertyDataCollection properties = managementClass.Properties;
foreach (PropertyData property in properties)
{
if (property.Name == key)
{
foreach (ManagementObject m in mn)
{
return m.Properties[property.Name].Value.ToString();
}
}
}
}
catch (Exception ex)
{
//这里写异常的处理
}
return string.Empty;
}
private static string GetMacAddressByNetworkInformation()
{
string key = "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}\\";
string macAddress = string.Empty;
try
{
NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();
foreach (NetworkInterface adapter in nics)
{
if (adapter.NetworkInterfaceType == NetworkInterfaceType.Ethernet
&& adapter.GetPhysicalAddress().ToString().Length != 0)
{
string fRegistryKey = key + adapter.Id + "\\Connection";
RegistryKey rk = Registry.LocalMachine.OpenSubKey(fRegistryKey, false);
if (rk != null)
{
string fPnpInstanceID = rk.GetValue("PnpInstanceID", "").ToString();
int fMediaSubType = Convert.ToInt32(rk.GetValue("MediaSubType", 0));
if (fPnpInstanceID.Length > 3 &&
fPnpInstanceID.Substring(0, 3) == "PCI")
{
macAddress = adapter.GetPhysicalAddress().ToString();
for (int i = 1; i < 6; i++)
{
macAddress = macAddress.Insert(3 * i - 1, ":");
}
break;
}
}
}
}
}
catch (Exception ex)
{
//这里写异常的处理
}
return macAddress;
}
}

2.加密解密代码；

public enum EncryptionKeyEnum
{
KeyA,
KeyB
}
public class EncryptionHelper
{
string encryptionKeyA = "pfe_Nova";
string encryptionKeyB = "WorkHard";
string md5Begin = "Hello";
string md5End = "World";
string encryptionKey = string.Empty;
public EncryptionHelper()
{
this.InitKey();
}
public EncryptionHelper(EncryptionKeyEnum key)
{
this.InitKey(key);
}
private void InitKey(EncryptionKeyEnum key = EncryptionKeyEnum.KeyA)
{
switch (key)
{
case EncryptionKeyEnum.KeyA:
encryptionKey = encryptionKeyA;
break;
case EncryptionKeyEnum.KeyB:
encryptionKey = encryptionKeyB;
break;
}
}
public string EncryptString(string str)
{
return Encrypt(str, encryptionKey);
}
public string DecryptString(string str)
{
return Decrypt(str, encryptionKey);
}
public string GetMD5String(string str)
{
str = string.Concat(md5Begin, str, md5End);
MD5 md5 = new MD5CryptoServiceProvider();
byte[] fromData = Encoding.Unicode.GetBytes(str);
byte[] targetData = md5.ComputeHash(fromData);
string md5String = string.Empty;
foreach (var b in targetData)
md5String += b.ToString("x2");
return md5String;
}
private string Encrypt(string str, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray = Encoding.Default.GetBytes(str);
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
StringBuilder ret = new StringBuilder();
foreach (byte b in ms.ToArray())
{
ret.AppendFormat("{0:X2}", b);
}
ret.ToString();
return ret.ToString();
}
private string Decrypt(string pToDecrypt, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
for (int x = 0; x < pToDecrypt.Length / 2; x++)
{
int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
inputByteArray[x] = (byte)i;
}
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
StringBuilder ret = new StringBuilder();
return System.Text.Encoding.Default.GetString(ms.ToArray());
}
}

注：这边在MD5时前后各加了一段字符，这样增加一点破解难度。

3.读写文件

public class RegistFileHelper
{
public static string ComputerInfofile = "ComputerInfo.key";
public static string RegistInfofile = "RegistInfo.key";
public static void WriteRegistFile(string info)
{
WriteFile(info, RegistInfofile);
}
public static void WriteComputerInfoFile(string info)
{
WriteFile(info, ComputerInfofile);
}
public static string ReadRegistFile()
{
return ReadFile(RegistInfofile);
}
public static string ReadComputerInfoFile()
{
return ReadFile(ComputerInfofile);
}
public static bool ExistComputerInfofile()
{
return File.Exists(ComputerInfofile);
}
public static bool ExistRegistInfofile()
{
return File.Exists(RegistInfofile);
}
private static void WriteFile(string info, string fileName)
{
try
{
using (StreamWriter sw = new StreamWriter(fileName, false))
{
sw.Write(info);
sw.Close();
}
}
catch (Exception ex)
{
}
}
private static string ReadFile(string fileName)
{
string info = string.Empty;
try
{
using (StreamReader sr = new StreamReader(fileName))
{
info = sr.ReadToEnd();
sr.Close();
}
}
catch (Exception ex)
{
}
return info;
}
}

4.其他界面代码：

主界面代码：

public partial class FormMain : Form
{
private string encryptComputer = string.Empty;
private bool isRegist = false;
private const int timeCount = 30;
public FormMain()
{
InitializeComponent();
Control.CheckForIllegalCrossThreadCalls = false;
}
private void FormMain_Load(object sender, EventArgs e)
{
string computer = ComputerInfo.GetComputerInfo();
encryptComputer = new EncryptionHelper().EncryptString(computer);
if (CheckRegist() == true)
{
lbRegistInfo.Text = "已注册";
}
else
{
lbRegistInfo.Text = "待注册，运行十分钟后自动关闭";
RegistFileHelper.WriteComputerInfoFile(encryptComputer);
TryRunForm();
}
}
/// <summary>
/// 试运行窗口
/// </summary>
private void TryRunForm()
{
Thread threadClose = new Thread(CloseForm);
threadClose.IsBackground = true;
threadClose.Start();
}
private bool CheckRegist()
{
EncryptionHelper helper = new EncryptionHelper();
string md5key = helper.GetMD5String(encryptComputer);
return CheckRegistData(md5key);
}
private bool CheckRegistData(string key)
{
if (RegistFileHelper.ExistRegistInfofile() == false)
{
isRegist = false;
return false;
}
else
{
string info = RegistFileHelper.ReadRegistFile();
var helper = new EncryptionHelper(EncryptionKeyEnum.KeyB);
string registData = helper.DecryptString(info);
if (key == registData)
{
isRegist = true;
return true;
}
else
{
isRegist = false;
return false;
}
}
}
private void CloseForm()
{
int count = 0;
while (count < timeCount && isRegist == false)
{
if (isRegist == true)
{
return;
}
Thread.Sleep(1 * 1000);
count++;
}
if (isRegist == true)
{
return;
}
else
{
this.Close();
}
}
private void btnRegist_Click(object sender, EventArgs e)
{
if (lbRegistInfo.Text == "已注册")
{
MessageBox.Show("已经注册～");
return;
}
string fileName = string.Empty;
OpenFileDialog openFileDialog = new OpenFileDialog();
if (openFileDialog.ShowDialog() == DialogResult.OK)
{
fileName = openFileDialog.FileName;
}
else
{
return;
}
string localFileName = string.Concat(
Environment.CurrentDirectory,
Path.DirectorySeparatorChar,
RegistFileHelper.RegistInfofile);
if (fileName != localFileName)
File.Copy(fileName, localFileName, true);
if (CheckRegist() == true)
{
lbRegistInfo.Text = "已注册";
MessageBox.Show("注册成功～");
}
}
}

注册机代码：

public partial class FormMain : Form
{
public FormMain()
{
InitializeComponent();
}
private void btnRegist_Click(object sender, EventArgs e)
{
string fileName = string.Empty;
OpenFileDialog openFileDialog = new OpenFileDialog();
if (openFileDialog.ShowDialog() == DialogResult.OK)
{
fileName = openFileDialog.FileName;
}
else
{
return;
}
string localFileName = string.Concat(
Environment.CurrentDirectory,
Path.DirectorySeparatorChar,
RegistFileHelper.ComputerInfofile);
if (fileName != localFileName)
File.Copy(fileName, localFileName, true);
string computer = RegistFileHelper.ReadComputerInfoFile();
EncryptionHelper help = new EncryptionHelper(EncryptionKeyEnum.KeyB);
string md5String = help.GetMD5String(computer);
string registInfo = help.EncryptString(md5String);
RegistFileHelper.WriteRegistFile(registInfo);
MessageBox.Show("注册码已生成");
}
}

最后采用ConfuserEx将可执行文件加密（ConfuserEx介绍），这样就不能反编译获得源码。

至此全部完成，只是个人的一些实践，对自己是一个记录，同时希望也能对别人有些帮助，如果有什么错误，还望不吝指出，共同进步，转载请保留原文地址。

示例源码下载