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。

https://download.csdn.net/download/pfe_nova/7943235

https://www.cnblogs.com/hanzhaoxin/archive/2013/01/04/2844191.html