C#双重密钥激活软件和试用限制

这篇文章(https://www.daboke.com)介绍了如何使用明码和暗码组合的双重密钥给软件激活和试用限制。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using System.IO;

namespace softwareTrial
{
    class DES
    {
        /// 
  
        /// C# DES解密方法  
        /// 
  
        /// 待解密的字符串  
        /// 密钥  
        /// 向量  
        /// 解密后的字符串  
        public static string DESDecrypt（string encryptedValue string key string iv）
        {
            using （DESCryptoServiceProvider sa =
                new DESCryptoServiceProvider
                { Key = Encoding.UTF8.GetBytes（key） IV = Encoding.UTF8.GetBytes（iv） }）
            {
                using （ICryptoTransform

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2020-04-19 18:03  softwareTrial\
     目录           0  2020-04-19 18:03  softwareTrial\.vs\
     目录           0  2020-04-19 18:03  softwareTrial\.vs\softwareTrial\
     目录           0  2020-04-19 18:03  softwareTrial\.vs\softwareTrial\v16\
     文件       55296  2020-04-20 19:55  softwareTrial\.vs\softwareTrial\v16\.suo
     目录           0  2020-04-19 18:03  softwareTrial\.vs\softwareTrial\v16\Server\
     目录           0  2020-04-20 19:55  softwareTrial\.vs\softwareTrial\v16\Server\sqlite3\
     文件           0  2020-04-19 18:03  softwareTrial\.vs\softwareTrial\v16\Server\sqlite3\db.lock
     文件      577536  2020-04-20 19:44  softwareTrial\.vs\softwareTrial\v16\Server\sqlite3\storage.ide
     目录           0  2020-04-20 19:43  softwareTrial\softwareTrial\
     目录           0  2020-04-19 18:49  softwareTrial\softwareTrial\bin\
     目录           0  2020-04-20 19:55  softwareTrial\softwareTrial\bin\Debug\
     文件       14848  2020-04-20 19:55  softwareTrial\softwareTrial\bin\Debug\softwareTrial.exe
     文件       42496  2020-04-20 19:55  softwareTrial\softwareTrial\bin\Debug\softwareTrial.pdb
     目录           0  2020-04-19 18:49  softwareTrial\softwareTrial\bin\Release\
     文件        2739  2020-04-19 18:53  softwareTrial\softwareTrial\DES.cs
     文件        6778  2020-04-20 19:43  softwareTrial\softwareTrial\Form1.cs
     文件        6304  2020-04-20 18:12  softwareTrial\softwareTrial\Form1.Designer.cs
     文件        5817  2020-04-20 18:12  softwareTrial\softwareTrial\Form1.resx
     目录           0  2020-04-19 18:03  softwareTrial\softwareTrial\obj\
     目录           0  2020-04-20 19:55  softwareTrial\softwareTrial\obj\Debug\
     文件        1423  2020-04-20 13:27  softwareTrial\softwareTrial\obj\Debug\DesignTimeResolveAssemblyReferences.cache
     文件        7018  2020-04-22 14:47  softwareTrial\softwareTrial\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache
     文件          42  2020-04-20 19:55  softwareTrial\softwareTrial\obj\Debug\softwareTrial.csproj.CoreCompileInputs.cache
     文件         910  2020-04-20 19:55  softwareTrial\softwareTrial\obj\Debug\softwareTrial.csproj.FileListAbsolute.txt
     文件        1012  2020-04-20 19:55  softwareTrial\softwareTrial\obj\Debug\softwareTrial.csproj.GenerateResource.cache
     文件         424  2020-04-20 19:55  softwareTrial\softwareTrial\obj\Debug\softwareTrial.csprojAssemblyReference.cache
     文件       14848  2020-04-20 19:55  softwareTrial\softwareTrial\obj\Debug\softwareTrial.exe
     文件         180  2020-04-20 19:55  softwareTrial\softwareTrial\obj\Debug\softwareTrial.Form1.resources
     文件       42496  2020-04-20 19:55  softwareTrial\softwareTrial\obj\Debug\softwareTrial.pdb
     文件         180  2020-04-20 19:55  softwareTrial\softwareTrial\obj\Debug\softwareTrial.Properties.Resources.resources
............此处省略11个文件信息