scy.cs

如文件名所说,可以根据主机的CPU,硬盘的物理编码编写注册码

using System;
using System.IO;
using System.Security.Cryptography;
using System.Windows.Forms;
using System.Text;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;


namespace 用户注册
{
    public class scy
    {
        const string KEY_64 = "VavicApp";
        const string IV_64 = "VavicApp"; //注意了，是8个字符，64位

        public static string Encode(string data)
        {
            byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
            byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);
            DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
            int i = cryptoProvider.KeySize;
            MemoryStream ms = new MemoryStream();
            CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write);

            StreamWriter sw = new StreamWriter(cst);
            sw.Write(data);
            sw.Flush();
            cst.FlushFinalBlock();

            sw.Flush();
            return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);

        }
        public static string Decode(string data)
        {

            byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
            byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);
            byte[] byEnc;
            try
            {
                byEnc = Convert.FromBase64String(data);
            }
            catch
            {

                return null;
            }


            DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
            MemoryStream ms = new MemoryStream(byEnc);
            CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read);
            StreamReader sr = new StreamReader(cst);
            try
            {
                return sr.ReadToEnd();
            }
            catch
            {
                return null;
            }
            //string str  = "数据库连接不成功";
            //return str;

        }

    }
}