C#版3DES加密解密简单示例

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

using System.Security.Cryptography;
using System.IO;

namespace _3DES
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void CrypeBtn_Click(object sender, EventArgs e)
        {
            //实例化三倍DES服务提供者类
            TripleDESCryptoServiceProvider TDES = new TripleDESCryptoServiceProvider();

            //随机生成密钥和IV向量
            TDES.GenerateIV();
            TDES.GenerateKey();

            //执行加密
            byte[] EncrypeByte = EncrypText(StrBox.Text, TDES.Key, TDES.IV);

            //显示密文和密钥
            KeyBox.Text = Encoding.ASCII.GetString(TDES.Key);
            IVBox.Text = Encoding.ASCII.GetString(TDES.IV);
            CrypeBox.Text = Encoding.UTF8.GetString(EncrypeByte);

            //执行解密
            Str2Box.Text = DecrypText(EncrypeByte, TDES.Key, TDES.IV);
        }

        #region 加密
        /// <summary>
        /// 执行三倍DES加密的方法
        /// </summary>
        /// <param name="Str">明文字符串</param>
        /// <param name="Key">密钥</param>
        /// <param name="IV">IV向量</param>
        /// <returns>密文的字节序列</returns>
        private byte[] EncrypText(string Str, byte[] Key, byte[] IV)
        {
            //创建一个内存流，用于存放密文
            MemoryStream MS = new MemoryStream();

            //创建一个三倍DES服务提供者对象
            TripleDESCryptoServiceProvider TDES = new TripleDESCryptoServiceProvider();

            //创建一个加密流，用于加密操作
            CryptoStream CS = new CryptoStream(MS,
                TDES.CreateEncryptor(Key, IV),
                CryptoStreamMode.Write);

            //定义输入，执行加密操作
            CS.Write(Encoding.UTF8.GetBytes(Str), 0, Str.Length);
            CS.FlushFinalBlock();

            //返回将密文的内存流转换为字节序列并返回
            return MS.ToArray();
        }
        #endregion

        #region 解密
        /// <summary>
        /// 执行三倍DES解密的方法
        /// </summary>
        /// <param name="CrypeText">密文的字节序列</param>
        /// <param name="Key">密钥</param>
        /// <param name="IV">IV向量</param>
        /// <returns>明文的字符串</returns>
        private string DecrypText(byte[] CrypeText, byte[] Key, byte[] IV)
        {
            //创建一个内存流，用于存放密文
            MemoryStream MS = new MemoryStream(CrypeText);

            //创建一个三倍DES服务提供者对象
            TripleDESCryptoServiceProvider TDES = new TripleDESCryptoServiceProvider();

            //创建解密流
            CryptoStream CS = new CryptoStream(MS,
                TDES.CreateDecryptor(Key, IV),
                CryptoStreamMode.Read);

            //创建一个用于存放明文的容器（字节序列）
            byte[] DecrypeBytes = new byte[CrypeText.Length];

            //执行解密
            CS.Read(DecrypeBytes, 0, CrypeText.Length);

            //返回解密后的明文字符串
            return Encoding.UTF8.GetString(DecrypeBytes);
        }

        #endregion
    }
}