Form1.cs

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using System;

using System.Security.Cryptography;
using System.Text;
using System.Windows.Forms;

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

        }

        #region 数据加密
        /// <summary> 
        /// 加密数据 
        /// </summary> 
        /// <param name="Text">密文</param> 
        /// <param name="sKey">密钥</param> 
        /// <returns></returns> 
        public static string Encrypt(string Text, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray;
            inputByteArray = Encoding.Default.GetBytes(Text);
            des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            System.IO.MemoryStream ms = new System.IO.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);
            }
            return ret.ToString();
        }
        #endregion



        #region 数据解密
        /// <summary> 
		/// 解密数据 
		/// </summary> 
		/// <param name="Text">密文</param> 
		/// <param name="sKey">密钥</param> 
		/// <returns></returns> 
		public static string Decrypt(string Text, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            int len;
            len = Text.Length / 2;
            byte[] inputByteArray = new byte[len];
            int x, i;
            for (x = 0; x < len; x++)