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