C#DES加密

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Text;
using System.Windows.Forms;
using System.Security.Cryptography;//加密部分
using System.IO; 
 
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        } 
 
        private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
        private static string keyUse = "12345678";
        private static string keyDe = "12345678";
        /// <summary>
        /// DES加密字符串
        /// </summary>
        /// <param name="encryptString">待加密的字符串
        /// <param name="encryptKey">加密密钥,要求为8位
        /// <returns>加密成功返回加密后的字符串，失败返回源串</returns>
        public static string EncryptDES(string encryptString, string encryptKey)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
                DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Convert.ToBase64String(mStream.ToArray());
            }
            catch
            {
                return encryptString;
            }
        } 
 
        /// <summary>
        /// DES解密字符串
        /// </summary>
        /// <param name="decryptString">待解密的字符串
        /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同
        /// <returns>解密成功返回解密后的字符串，失败返源串</returns>
        public static string DecryptDES(string decryptString, string decryptKey)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Convert.FromBase64String(decryptString);
                DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Encoding.UTF8.GetString(mStream.ToArray());
            }
            catch
            {
                return decryptString;
            }
        } 
 
        private void button1_Click(object sender, EventArgs e)
        {
            string strOrg = TB_ORG.Text;
            string tmp = System.Text.Encoding.Default.GetString(Keys);//[].ToString();//BitConverter.ToString(Keys).Replace("-", string.Empty);// Keys.ToString();
            string strEp = EncryptDES(strOrg, keyUse);
            TB_EP.Text = strEp;
        } 
 
        private void button2_Click(object sender, EventArgs e)
        {
            string strEp = TB_EP.Text;
            string tmp = System.Text.Encoding.Default.GetString(Keys);//BitConverter.ToString(Keys).Replace("-", string.Empty);// Keys.ToString();
            string strDe = DecryptDES(strEp, keyDe);
            TB_DE.Text = strDe;
        }
    }
}