我的c#注册码操作类

最新推荐文章于 2025-09-18 14:31:09 发布

原创最新推荐文章于 2025-09-18 14:31:09 发布 · 686 阅读

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#c# #string #byte #exception #encoding #解密

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本文介绍了一个C#实现的加密解密类，包括DES加密算法的使用，并展示了如何通过这些加密方法来验证软件注册码的有效性。

1类库：

2使用方法

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Security.Cryptography;
namespace Szj
{
    internal sealed class Util
    {
        const string EncryptText = "惺惺惜惺惺";
        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="strText"></param>
        /// <returns></returns>
        public static String Encrypt(String strText)
        {
            Byte[] byKey = { };
            Byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
            try
            {
                byKey = System.Text.Encoding.UTF8.GetBytes(EncryptText.Substring(0, 8));
                DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                Byte[] inputByteArray = Encoding.UTF8.GetBytes(strText);
                MemoryStream ms = new MemoryStream();
                CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write);
                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();
                return Convert.ToBase64String(ms.ToArray());
            }
            catch (Exception ex)
            {
                return ex.Message;
            }
        }
        /// <summary>
        /// 解密
        /// </summary>
        /// <param name="strText"></param>
        /// <returns></returns>
        public static String Decrypt(String strText)
        {
            Byte[] byKey = { };
            Byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
            Byte[] inputByteArray = new byte[strText.Length];
            try
            {
                byKey = System.Text.Encoding.UTF8.GetBytes(EncryptText.Substring(0, 8));
                DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                inputByteArray = Convert.FromBase64String(strText);
                MemoryStream ms = new MemoryStream();
                CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);
                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();
                System.Text.Encoding encoding = System.Text.Encoding.UTF8;
                return encoding.GetString(ms.ToArray());
            }
            catch (Exception ex)
            {
                return ex.Message;
            }
        }
        public static string MD5(string inStr)
        {
            MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
            byte[] InBytes = Encoding.GetEncoding("GB2312").GetBytes(inStr);
            byte[] OutBytes = md5.ComputeHash(InBytes);
            string OutString = "";
            for (int i = 0; i < OutBytes.Length; i++)
            {
                OutString += OutBytes[i].ToString("x2");
            }
            return OutString;

}
}
}

from窗体
if (RegDog.VerifyMachineCode(txtMachineCode.Text.Trim(), txtRegCode.Text.Trim()))
            {
                MessageBox.Show("注册成功！");
                this.DialogResult = DialogResult.OK;
            }
            else
            {
                MessageBox.Show("错误的注册码");
            }